Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average sea temperature in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
The shift from August to September in Istanbul includes a small decrease in the average high-temperature, from 27.8°C (82°F) to a still moderately hot 24.3°C (75.7°F). During the September nights, Istanbul's temperature maintains an average close to the daytime highs, settling at a pleasant 20.4°C (68.7°F).Humidity
In Istanbul, the average relative humidity in September is 68%.Rainfall
In Istanbul, Turkey, in September, during 10 rainfall days, 26mm (1.02") of precipitation is typically accumulated. Throughout the year, in Istanbul, 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, in September, the average water temperature is 22.8°C (73°F).Note: Given an individual's cold sensitivity, considering factors like sunshine, wind, and air temperature, a brief swim in 22.8°C (73°F) water might be pleasurable. (FYI: The standard water temperature for Olympic swimming contests is 25°C (77°F) to 28°C (82.4°F).)
Daylight
The average length of the day in September is 12h and 28min.On the first day of the month, sunrise is at 06:31 and sunset at 19:36. On the last day of September, in Istanbul, sunrise is at 07:00 and sunset at 18:47 +03.
Sunshine
In Istanbul, the average sunshine in September is 8.9h.UV index
The average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for average individuals.Note: In September, the maximum UV index of 5 suggests these recommendations:
Guard yourself - An obligation to protect skin and eyes from harm exists. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. Stay sun-safe with clothing that is both closely woven and worn loosely. Heads up! Sand and water reflection magnifies the UV exposure from the Sun.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September in Istanbul?
What is the average humidity in September in Istanbul?
How much does it rain in Istanbul in September?
When it does not snow in Istanbul?
How warm is the water in September in Istanbul?
How many hours of daylight does Istanbul have in September?
What time are sunrise and sunset in September in Istanbul?
How many hours of sunshine does Istanbul have in September?
How high is the UV index in September in Istanbul?
Average temperature in September
Istanbul, Turkey
- Average high temperature in September: 24.3°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 September: 20.4°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 September
Istanbul, Turkey
- Average pressure in September: 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 September
Istanbul, Turkey
- Average wind speed in September: 18.1km/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 September
Istanbul, Turkey
- Average humidity in September: 68%
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 September
Istanbul, Turkey
- Average rainfall in September: 26mm
The wettest month (with the highest rainfall) is December (52mm).
The driest month (with the least rainfall) is August (11mm).
Average rainfall days in September
Istanbul, Turkey
- Average rainfall days in September: 10 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 September
Istanbul, Turkey
- Average snowfall in September: 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 September
Istanbul, Turkey
- Average snowfall days in September: 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 September
Istanbul, Turkey
- Average sea temperature in September: 22.8°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 September /
Average sunshine in September
Istanbul, Turkey
- Average daylight in September: 12h 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 September: 8h 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 in September
Istanbul, Turkey
- Average sunshine days in September: 16.9 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 September
Istanbul, Turkey
- Average UV index in September: 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).
Average cloud cover in September
Istanbul, Turkey
- Average cloud cover in September: 24
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 September
Istanbul, Turkey
- Average visibility in September: 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).
Istanbul, Turkey
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