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Contents
- The climate of Istanbul
- The best time to visit Istanbul
- The worst time to visit Istanbul
- Spring weather in Istanbul
- Summer weather in Istanbul
- Autumn weather in Istanbul
- Winter weather in Istanbul
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average sea temperature
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
Ships along the coast of the city port of Istanbul, Turkey
The climate of Istanbul
Istanbul, geographically positioned in the transition zone between a humid subtropical climate and a Mediterranean climate, shares the characteristics of both, as recorded in the Köppen climate classification. It carries the climate code of Csa, corresponding with its Mediterranean climate with hot summers.
Throughout the year, Istanbul is appropriately balanced when it comes to meteorological conditions. The average high temperature exists on a scale from 8.5°C (47.3°F) to 27.9°C (82.2°F), while the low temperature parallelly moves from 5.3°C (41.5°F) to 23.3°C (73.9°F). Indoor and outdoor activities can be regularly planned, considering the average daylight ranges between 9.6 hours to 15.1 hours over the year.
In terms of precipitation, Istanbul features distinct wetter and drier periods, with rainfall varying from 13mm (0.51") to 52mm (2.05") per month, and the annual snowfall concentrating primarily in the winter months, reaching up to 24mm (0.94") in January. The city is also characterized by a relative average humidity between 67% and 78% throughout the year.
Noticeably, the wind speed in Istanbul varies on a moderate scale, starting from 14km/h (8.7mph) and reaching a peak of approximately 20km/h (12.4mph). It is also worthy to note that Istanbul enjoys a visibility of about 10km (6.2mi) consistently throughout the year, offering unfettered sightseeing opportunities for all residents and visitors.
Throughout the year, Istanbul is appropriately balanced when it comes to meteorological conditions. The average high temperature exists on a scale from 8.5°C (47.3°F) to 27.9°C (82.2°F), while the low temperature parallelly moves from 5.3°C (41.5°F) to 23.3°C (73.9°F). Indoor and outdoor activities can be regularly planned, considering the average daylight ranges between 9.6 hours to 15.1 hours over the year.
In terms of precipitation, Istanbul features distinct wetter and drier periods, with rainfall varying from 13mm (0.51") to 52mm (2.05") per month, and the annual snowfall concentrating primarily in the winter months, reaching up to 24mm (0.94") in January. The city is also characterized by a relative average humidity between 67% and 78% throughout the year.
Noticeably, the wind speed in Istanbul varies on a moderate scale, starting from 14km/h (8.7mph) and reaching a peak of approximately 20km/h (12.4mph). It is also worthy to note that Istanbul enjoys a visibility of about 10km (6.2mi) consistently throughout the year, offering unfettered sightseeing opportunities for all residents and visitors.
The best time to visit Istanbul
Considering the temperate range of temperatures, the reduction of rainfall, and the increased hours of daylight and sunshine, the best time to visit Istanbul are probably the months of May, June, July and September. During this stretch, average high temperatures fluctuate from 20.9°C (69.6°F) to 27.8°C (82°F) and provide an excellent opportunity for sightseeing, leisurely walks, and exploration of the city's rich historical expanses.
The worst time to visit Istanbul
Although Istanbul maintains mild weather conditions throughout the year, the colder months of December, January, and February might notably impact tourist activity. These months bring the least amount of sunshine: from 4.8 hours to 5.9 hours per day. Average high temperatures stay between 8.5°C (47.3°F) and 10.7°C (51.3°F), while average low temperatures range from 5.3°C (41.5°F) to 7.7°C (45.9°F). The winter months also see a rise in rainfall, reaching 52mm (2.05") in December.
Spring weather in Istanbul
Spring in Istanbul manifests itself in gradually increasing temperatures, moving from an average high of 11.8°C (53.2°F) in March to a pleasant 20.9°C (69.6°F) by May. Conjointly, the low temperature grows from 7.4°C (45.3°F) to 15.1°C (59.2°F). The season also witnesses a decrease in the number of rainfall days per month. Irrefutably, the extended daylight hours, which grow from 12 hours in March to 14.5 hours in May, are a prompt for outdoor activities.
Summer weather in Istanbul
Istanbul’s summer sets in from June and runs through August, characterizing it with warm to slightly hot temperatures. High's average between 25.4°C (77.7°F) and 27.9°C (82.2°F), alongside the lows which sit comfortably between 20°C (68°F) and 23.3°C (73.9°F). The city receives the maximum daylight averaging at 15.1 hours in June. Remarkably, it is the driest period of the year, with rainfall averaging from 11mm (0.43") to 32mm (1.26") over these months.
Autumn weather in Istanbul
Istanbul welcomes autumn in September and it lasts until November. The temperature commences to drop down from an average high of 24.3°C (75.7°F) in September to 15.4°C (59.7°F) in November. Low temperatures also follow a similar trend, arriving at 12.5°C (54.5°F) by November from 20.4°C (68.7°F). The city sees a rise in rainfall from 26mm (1.02") in September to 33mm (1.3") in November. Despite the increased cloud cover, Istanbul continues to offer ten hours and more daylight for outdoor activities.
Winter weather in Istanbul
Winter in Istanbul, occurring from December until February, is mild but ringing in cold temperatures and increased rainfall. Average high temperatures hover between 8.5°C (47.3°F) and 10.7°C (51.3°F), while the average lows range from 5.3°C (41.5°F) to 7.7°C (45.9°F). The city gets the lowermost amount of sunshine during the winter months, falling to 4.8 hours per day in December. The period records higher rainfall with 52mm (2.05") being registered in December. Despite lower temperatures, Istanbul seldom experiences harsh cold or heavy snowfall, making it a moderately pleasant destination even in winter. It is the only time of the year when Istanbul records snowfall with January witnessing the highest snowfall of approximately 24mm (0.94").
Weather in January
As the year commences in Istanbul, Turkey, the weather is prominently cold, underscored by a mix of rain and snow. The month is distinguished by the year's lowest average sea temperatures which plunge to a chilly 8.4°C (47.1°F), paired with snowy days marking the landscape white. Weather in January »
Weather in February
Following January's cold threshold, February brings a slight increase in temperature, though the winter still very much lingers in Istanbul. The fair city witnesses a decrease in snowfall alongside a diminishing number of rainy days. Weather in February »
Weather in March
Transitioning to spring, March becomes noticeably warmer, marking the end of Istanbul’s snowy season. Average high temperatures take an upwards turn to 11.8°C (53.2°F), making the city's ambiance pleasantly cool rather than outright cold. Weather in March »
Weather in April
April sees a significant shift in Istanbul’s weather pattern, with a distinct transition into the mildness of spring. The rainfall dips to an average month volume of 29mm (1.14") - the second lowest of the entire year. With longer periods of sunshine, Istanbul residents get to enjoy more of the city's stunning outdoor settings. Weather in April »
Weather in May
With spring in its prime, May ushers in a significantly warmer climate to Istanbul, rendering a renewed vigor to the historic city. The average high temperatures reach a balmy 20.9°C (69.6°F) in May, paving the way for outdoorsiness. Weather in May »
Weather in June
June brings the onset of summer to Istanbul, driving outdoor activities as temperature soars to 25.4°C (77.7°F) on average. With the longest daylight hours of the year and a drop in rainfall to 32mm (1.26"), June remains a popular month for summer visits. Weather in June »
Weather in July
In July, Istanbul basks in full summer glory, featuring warm temperatures and the highest average sea temperatures of 24.8°C (76.6°F) noted throughout the year. The minimal rainfall coupled with high temperatures evokes a decidedly summery feel. Weather in July »
Weather in August
August holds its own as the peak of Istanbul's summer, with average high temperatures reaching a scorching 27.8°C (82°F). The month holds the record for the least rainfall, only 11mm (0.43"), and not dunking below the high annual average humidity level of 68%. Weather in August »
Weather in September
September brings the early whispers of autumn to Istanbul while retaining the warmth of summer. The temperatures, while decreasing compared to peak summer, still remain in a comfortable range for outdoor activities. A marked increase in rainfall compared to the summer months begins to usher in autumnal freshness. Weather in September »
Weather in October
Istanbul in October feels the full effect of autumn with temperatures winding down and rainfall registering an uptick to 42mm (1.65"). October's transition to cooler weather brings vibrancy to the city's diverse landscape as fall foliage paints the town in rich colors. Weather in October »
Weather in November
Bringing noticeable cooler days and reduced daylight hours, November hints at the forthcoming winter. November witnesses a decrease in Istabul's average high temperatures, which settle at a cool 15.4°C (59.7°F). Despite this, the city continues to exhibit its transfixing beauty, albeit under a colder sky. Weather in November »
Weather in December
December in Istanbul ushers in winter, becoming the coolest month of the year with temperatures dropping to an average low of 7.7°C (45.9°F). A rebound in the number of rainy days and a resurgence of snowfall decorate the city with a festive, wintry appeal. Weather in December »
Updated: Jan 24, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the coldest months in Istanbul?
In Istanbul, Turkey, the average lowest temperatures are observed in January, with a high of 8.5°C (47.3°F) and a low of 5.3°C (41.5°F).
How much does it rain in Istanbul?
In Istanbul, Turkey, during the entire year, the rain falls for 130.7 days and collects up to 400mm (15.75") of precipitation.
When does it snow in Istanbul?
January through March and December are months with snowfall.
What is the snowiest month in Istanbul?
The month with the most snowfall in Istanbul, Turkey, is January, when snow falls for 3.7 days and typically aggregates up to 24mm (0.94") of snow.
How many days does it snow in Istanbul?
Throughout the year, in Istanbul, Turkey, there are 7.1 snowfall days, and 49mm (1.93") of snow is accumulated.
What is the month with the lowest UV index in Istanbul?
January, February and December, with an average maximum UV index of 2, are months with the lowest UV index.
What is the most humid month in Istanbul?
February is the most humid month in Istanbul, Turkey, with an average relative humidity of 78%.
What month is the sea coldest in Istanbul?
February is the month with the coldest seawater in Istanbul, with an average sea temperature of 7.8°C (46°F).
When it does not snow in Istanbul?
In Istanbul, snow does not fall in April through November.
What are the least humid months in Istanbul?
June and July, with an average relative humidity of 67%, are the least humid months in Istanbul.
When are the longest days in Istanbul?
June has the longest days of the year, with an average of 15h and 6min of daylight.
What is the warmest month in Istanbul?
In Istanbul, July is identified by the average highest temperatures, reaching a peak of 27.9°C (82.2°F) and a low of 22.3°C (72.1°F).
What month has the most sunshine in Istanbul?
July has the most sunshine of the year in Istanbul, Turkey, with an average of 11.8h of sunshine.
What is the month with the highest UV index in Istanbul?
July is the month with the highest UV index in Istanbul, with an average maximum UV index of 7.
What is the driest month in Istanbul?
August is the month with the least rainfall in Istanbul, Turkey. Rain falls for 3.8 days and accumulates 11mm (0.43") of precipitation.
What is the month with the warmest sea water in Istanbul?
The month with the warmest seawater in Istanbul is August, with an average sea temperature of 24.9°C (76.8°F).
What is the wettest month in Istanbul?
December is the month with the most rainfall in Istanbul. Rain falls for 13.6 days and accumulates 52mm (2.05") of precipitation.
What is the month with the shortest days in Istanbul?
December has the shortest days of the year in Istanbul, with an average of 9h and 18min of daylight.
Is there Daylight Saving Time (DST) in Istanbul?
Istanbul, Turkey, does not utilize Daylight Saving Time (DST). +03 timezone is used over the entire year.
What is the month with the least sunshine in Istanbul?
With an average of 4.8h of sunshine, December has the least sunshine of the year in Istanbul, Turkey.
Average temperature
Istanbul, Turkey
The warmest month (with the highest average high temperature) is July (27.9°C).
The month with the lowest average high temperature is January (8.5°C).
The month with the highest average low temperature is August (23.3°C).
The coldest month (with the lowest average low temperature) is January (5.3°C).
Average pressure
Istanbul, Turkey
- Average pressure in January:
1018.5mbar - Average pressure in February:
1017.2mbar - Average pressure in March:
1016.2mbar - Average pressure in April:
1015.1mbar - Average pressure in May:
1013.4mbar - Average pressure in June:
1012.4mbar
- Average pressure in July:
1011.7mbar - Average pressure in August:
1013mbar - Average pressure in September:
1015.1mbar - Average pressure in October:
1018.1mbar - Average pressure in November:
1019.2mbar - Average pressure in December:
1019.7mbar
The month with the highest atmospheric pressure is December (1019.7mbar).
The month with the lowest atmospheric pressure is July (1011.7mbar).
Average wind speed
Istanbul, Turkey
- Average wind speed in January:
19km/h - Average wind speed in February:
19km/h - Average wind speed in March:
17km/h - Average wind speed in April:
15.2km/h - Average wind speed in May:
14km/h - Average wind speed in June:
14.8km/h
- Average wind speed in July:
17.3km/h - Average wind speed in August:
20.5km/h - Average wind speed in September:
18.1km/h - Average wind speed in October:
17.8km/h - Average wind speed in November:
17.3km/h - Average wind speed in December:
18.8km/h
The windiest month (with the highest average wind speed) is August (20.5km/h).
The calmest month (with the lowest average wind speed) is May (14km/h).
Average humidity
Istanbul, Turkey
The month with the highest relative humidity is February (78%).
The months with the lowest relative humidity are June and July (67%).
Average rainfall
Istanbul, Turkey
The wettest month (with the highest rainfall) is December (52mm).
The driest month (with the least rainfall) is August (11mm).
Average rainfall days
Istanbul, Turkey
- Average rainfall days in January:
12.9 days - Average rainfall days in February:
12.4 days - Average rainfall days in March:
14.3 days - Average rainfall days in April:
12.6 days - Average rainfall days in May:
11.8 days - Average rainfall days in June:
9.5 days
- Average rainfall days in July:
6.3 days - Average rainfall days in August:
3.8 days - Average rainfall days in September:
10 days - Average rainfall days in October:
12.5 days - Average rainfall days in November:
11 days - Average rainfall days in December:
13.6 days
The month with the highest number of rainy days is March (14.3 days).
The month with the least rainy days is August (3.8 days).
Average snowfall
Istanbul, Turkey
The month with the highest snowfall is January (24mm).
The months with the least snowfall are April, May, June, July, August, September, October and November (0mm).
Average snowfall days
Istanbul, Turkey
- Average snowfall days in January:
3.7 days - Average snowfall days in February:
2 days - Average snowfall days in March:
0.5 days - Average snowfall days in April:
0 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0 days - Average snowfall days in November:
0 days - Average snowfall days in December:
0.9 days
The month with the highest number of snowfall days is January (3.7 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).
Average sea temperature
Istanbul, Turkey
The best month for swimming (with the highest average sea temperature) is August (24.9°C).
The coldest month (with the lowest average sea temperature) is February (7.8°C).
Average daylight / Average sunshine
Istanbul, Turkey
- Average daylight in January:
9h and 4min - Average daylight in February:
10h and 4min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 2min - Average daylight in May:
14h and 3min - Average daylight in June:
15h and 1min
- Average daylight in July:
14h and 5min - Average daylight in August:
13h and 5min - Average daylight in September:
12h and 3min - Average daylight in October:
11h and 1min - Average daylight in November:
9h and 5min - Average daylight in December:
9h and 2min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in January:
5h and 0min - Average sunshine in February:
6h and 0min - Average sunshine in March:
7h and 0min - Average sunshine in April:
8h and 1min - Average sunshine in May:
10h and 3min - Average sunshine in June:
11h and 2min
- Average sunshine in July:
11h and 5min - Average sunshine in August:
9h and 4min - Average sunshine in September:
8h and 5min - Average sunshine in October:
7h and 4min - Average sunshine in November:
5h and 5min - Average sunshine in December:
4h and 5min
The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is December (Average sunshine: 4h and 48min).
Average sunshine days
Istanbul, Turkey
- Average sunshine days in January:
13.3 days - Average sunshine days in February:
12.6 days - Average sunshine days in March:
14.5 days - Average sunshine days in April:
15.7 days - Average sunshine days in May:
17 days - Average sunshine days in June:
17.9 days
- Average sunshine days in July:
23.1 days - Average sunshine days in August:
25.5 days - Average sunshine days in September:
16.9 days - Average sunshine days in October:
15.1 days - Average sunshine days in November:
16.3 days - Average sunshine days in December:
14.7 days
The month with the most sunshine days is August (25.5 days).
The month with the least sunshine days is February (12.6 days).
Average UV index
Istanbul, Turkey
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February and December (UV index 2).
Average cloud cover
Istanbul, Turkey
The month with the most cloud cover is January (Cloud cover 55).
The months with the least cloud cover are July and August (Cloud cover 12).
Average visibility
Istanbul, Turkey
The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January and February (9km).
Istanbul, Turkey
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