April weather forecastIstanbul, Turkey
April
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. The warmer temperatures awaken the city from its winter slumber, as local flora begins to burst back into life. Despite being one of the winds' slower months, the sea of Marmara proceeds to display its might with majestic waves crashing onto the shores.Temperature
Istanbul's transition into April is marked by a minor temperature shift, moving from a fresh 11.8°C (53.2°F) in March to a moderate 15.3°C (59.5°F). Throughout April, an average low-temperature of 9.9°C (49.8°F) is expected in Istanbul.Humidity
In Istanbul, the average relative humidity in April is 70%.Rainfall
In Istanbul, in April, during 12.6 rainfall days, 29mm (1.14") of precipitation is typically 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, Turkey.Sea temperature
In April, the average sea temperature is 10.3°C (50.5°F).Note: Swimming in 10.3°C (50.5°F) poses a severe threat. Even short exposure to 13°C (55.4°F) is chilling, and going below 10°C (50°F) can cause breathing irregularities and intense cold shock, based on one's stamina.
Daylight
In April, the average length of the day in Istanbul, Turkey, is 13h and 19min.On the first day of the month, sunrise is at 06:46 and sunset at 19:29. On the last day of April, in Istanbul, sunrise is at 06:02 and sunset at 19:59 +03.
Sunshine
In April, the average sunshine in Istanbul is 8.2h.UV index
In April, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for the ordinary person.Note: The daily high UV index of 4 in April translates into this advice:
Heed the precautions - It is counselled to guard against solar damage. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in April
Istanbul, Turkey
- Average high temperature in April: 15.3°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 April: 9.9°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 in April
Istanbul, Turkey
- Average pressure in April: 1015.1mbar
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 in April
Istanbul, Turkey
- Average wind speed in April: 15.2km/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 in April
Istanbul, Turkey
- Average humidity in April: 70%
The month with the highest relative humidity is February (78%).
The months with the lowest relative humidity are June and July (67%).
Average rainfall in April
Istanbul, Turkey
- Average rainfall in April: 29mm
The wettest month (with the highest rainfall) is December (52mm).
The driest month (with the least rainfall) is August (11mm).
Average rainfall days in April
Istanbul, Turkey
- Average rainfall days in April: 12.6 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 in April
Istanbul, Turkey
- Average snowfall in April: 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).
Average snowfall days in April
Istanbul, Turkey
- Average snowfall days in April: 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).
Average sea temperature in April
Istanbul, Turkey
- Average sea temperature in April: 10.3°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).
Average daylight in April /
Average sunshine in April
Istanbul, Turkey
- Average daylight in April: 13h and 18min
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 April: 8h and 12min
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 in April
Istanbul, Turkey
- Average sunshine days in April: 15.7 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 in April
Istanbul, Turkey
- Average UV index in April: 4
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 in April
Istanbul, Turkey
- Average cloud cover in April: 33
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 in April
Istanbul, Turkey
- Average visibility in April: 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).
