Istanbul Weather: September
 |
Average Day Temperature: | 81.5°F |
|
Average Night Temperature: | 73.2°F |
|
Sea Water Temperature: | 76.0°F |
|
Number of Sunny Days: | 20 days |
| Sunshine Hours: | 11.8 - 13.1 hours | |
|
Number of Rainy Days: | 2 days |
| Precipitation Totals: | 0.9 in | |
| detailed information | ||
forecast
| Istanbul |
Temperature
| Istanbul |
Air Temperature in September, °F
The highest day temperature in September 2025 was 88°F. The lowest night temperature was 62°F. The average values for day and night temperatures during September were 79.1°F и 70.4°F respectivly.
Istanbul Water Sea Temperature in September, °F
The average sea surface temperature in September 2025 for Istanbul was 76.3°F. The maximum and minimum values were 73.8°F and 79.2°F respectively.
Most of the days in September are sunny but you can also expect cloudy and gloomy days.
Precipitation Totals in September, in
Precipitation total in September for Istanbul is 0.9 in. It makes september one of the least rainy months of the year.
The average wind speed in September is 11.9 mph. It makes September one of the most windy months of the year for Istanbul.
We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Istanbul in September is 9.5 hours.
Istanbul on the Weather Map
| Alanya |  |
+58 |
| Antalya | |
+54 |
| Avsallar | |
+58 |
| Beldibi |  |
+52 |
| Belek | |
+60 |
| Bodrum |  |
+64 |
| Fethiye |  |
+60 |
| Istanbul | |
+54 |
| Kas | |
+50 |
| Kemer | |
+52 |
| Konakli | |
+58 |
| Marmaris | |
+58 |
| Okurcalar | |
+60 |
| Oludeniz | |
+60 |
| Side | |
+60 |
| 0900 |  |
56°F | W 6 mph |
| 1200 | |
64°F | SW 9 mph |
| 1500 | |
64°F | W 9 mph |
| 1800 |  |
60°F | SW 5 mph |
| 2100 | |
60°F | W 6 mph |
| 0000 | |
58°F | SW 5 mph |
| 0300 | |
58°F | NW 4 mph |
| 0600 | |
58°F | NW 3 mph |