May weather forecast
Istanbul, Turkey

Ships along the coast of the city port of Istanbul, Turkey
Ships along the coast of the city port of Istanbul, Turkey

Weather in May

The last month of the spring, May, is an agreeable month in Istanbul, Turkey, with temperature in the range of an average low of 15.1°C (59.2°F) and an average high of 20.9°C (69.6°F).

Temperature

In Istanbul, the average high-temperature in May increases from a moderate 15.3°C (59.5°F) in April to an agreeable 20.9°C (69.6°F). The average low-temperature, in May, is 15.1°C (59.2°F).

Humidity

In Istanbul, the average relative humidity in May is 70%.

Rainfall

In May, in Istanbul, the rain falls for 11.8 days. Throughout May, 38mm (1.5") of precipitation is accumulated. Throughout the year, there are 130.7 rainfall days, and 400mm (15.75") of precipitation is accumulated.

Snowfall

April through November are months without snowfall in Istanbul.

Sea temperature

In Istanbul, the average seawater temperature in May is 15.7°C (60.3°F).
Note: For most, swimming in 15.7°C (60.3°F) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 21°C (69.8°F) to 15°C (59°F).

Daylight

The average length of the day in May in Istanbul is 14h and 29min.
On the first day of the month, sunrise is at 06:02 and sunset at 20:00. On the last day of May, sunrise is at 05:34 and sunset at 20:28 +03.

Sunshine

In Istanbul, the average sunshine in May is 10.5h.

UV index

In May, the average daily maximum UV index in Istanbul is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for the average person.
Note: The average daily UV index of 5 in May transform into the following instructions:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the temperature in May in Istanbul?

In May, in Istanbul, the average high-temperature is 20.9°C (69.6°F), and the average low-temperature is 15.1°C (59.2°F).

What is the average humidity in May in Istanbul?

The average relative humidity in May in Istanbul is 70%.

How much does it rain in Istanbul in May?

In May, in Istanbul, Turkey, the rain falls for 11.8 days. Throughout May, 38mm (1.5") of precipitation is accumulated.

When it does not snow in Istanbul?

April through November are months without snowfall in Istanbul.

What is the sea water temperature in May in Istanbul?

In Istanbul, Turkey, in May, the average water temperature is 15.7°C (60.3°F). For most, swimming in 15.7°C (60.3°F) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 21°C (69.8°F) to 15°C (59°F).

How many hours of daylight does Istanbul have in May?

In Istanbul, the average day length in May is 14h and 29min.

When is the sunrise / sunset in May in Istanbul?

In May, on the first day of the month, sunrise is at 06:02 and sunset at 20:00. On the last day of the month, in Istanbul, sunrise is at 05:34 and sunset at 20:28 +03.

How long on average sun shines in May in Istanbul?

In May, the average sunshine duration is 10.5h.

What is the UV index reading in May in Istanbul?

In May, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a medium hazard to health from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover

Average temperature in May
Istanbul, Turkey

Average temperature in May - Istanbul, Turkey
  • Average high temperature in May: 20.9°C

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).

  • Average low temperature in May: 15.1°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).

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Average pressure in May
Istanbul, Turkey

Average pressure in May - Istanbul, Turkey
  • Average pressure in May: 1013.4mbar

The month with the highest atmospheric pressure is December (1019.7mbar).
The month with the lowest atmospheric pressure is July (1011.7mbar).

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Average wind speed in May
Istanbul, Turkey

Average wind speed in May - Istanbul, Turkey
  • Average wind speed in May: 14km/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).

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Average humidity in May
Istanbul, Turkey

Average humidity in May - Istanbul, Turkey
  • Average humidity in May: 70%

The month with the highest relative humidity is February (78%).
The months with the lowest relative humidity are June and July (67%).

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Average rainfall in May
Istanbul, Turkey

Average rainfall in May - Istanbul, Turkey
  • Average rainfall in May: 38mm

The wettest month (with the highest rainfall) is December (52mm).
The driest month (with the least rainfall) is August (11mm).

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Average rainfall days in May
Istanbul, Turkey

Average rainfall days in May - Istanbul, Turkey
  • Average rainfall days in May: 11.8 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).

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Average snowfall in May
Istanbul, Turkey

Average snowfall in May - Istanbul, Turkey
  • Average snowfall in May: 0mm

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).

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Average snowfall days in May
Istanbul, Turkey

Average snowfall days in May - Istanbul, Turkey
  • Average snowfall days in May: 0 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).

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Average sea temperature in May
Istanbul, Turkey

Average sea temperature in May - Istanbul, Turkey
  • Average sea temperature in May: 15.7°C

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).

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Average daylight in May /
Average sunshine in May
Istanbul, Turkey

Average daylight in May / Average sunshine in May - Istanbul, Turkey
  • Average daylight in May: 14h and 3min

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 May: 10h and 3min

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).

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Average sunshine days in May
Istanbul, Turkey

Average sunshine days in May - Istanbul, Turkey
  • Average sunshine days in May: 17 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).

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Average UV index in May
Istanbul, Turkey

Average UV index in May - Istanbul, Turkey
  • Average UV index in May: 5

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).

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Average cloud cover in May
Istanbul, Turkey

Average cloud cover in May - Istanbul, Turkey
  • Average cloud cover in May: 27

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).

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Average visibility in May
Istanbul, Turkey

Average visibility in May - Istanbul, Turkey
  • Average visibility in May: 10km

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).

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