Istanbul Climate — Average Highs, Lows & Rainfall by Month
Istanbul has a temperate climate with four distinct seasons. Daytime temperatures average 30°C / 86°F in August, the warmest month, and drop to 10°C / 50°F in February, the coldest. Overnight lows in February average 4°C / 39°F. Istanbul receives about 756 mm of rain a year across roughly 104 wet days, with November the wettest month.
Averages for 2021–2025 · Open-Meteo Historical Weather API (ERA5 reanalysis) · Updated 2026-10-05
Monthly averages in Istanbul
Average daytime high, overnight low and rainfall for each month of the year.
| Month | Avg high | Avg low | Rainfall | Wet days |
|---|---|---|---|---|
| January | 11°C / 51°F | 5°C / 40°F | 91 mm | 12 |
| February | 10°C / 50°F | 4°C / 39°F | 76 mm | 10 |
| March | 12°C / 54°F | 5°C / 41°F | 76 mm | 13 |
| April | 17°C / 62°F | 9°C / 48°F | 70 mm | 10 |
| May | 21°C / 71°F | 13°C / 55°F | 57 mm | 9 |
| June | 27°C / 80°F | 18°C / 64°F | 42 mm | 6 |
| July | 30°C / 86°F | 21°C / 70°F | 33 mm | 4 |
| August | 30°C / 86°F | 22°C / 71°F | 20 mm | 4 |
| September | 26°C / 78°F | 18°C / 64°F | 49 mm | 7 |
| October | 20°C / 68°F | 13°C / 56°F | 53 mm | 7 |
| November | 17°C / 62°F | 10°C / 51°F | 100 mm | 9 |
| December | 12°C / 54°F | 7°C / 45°F | 90 mm | 13 |
Best time to visit Istanbul
June, September, October offer the most comfortable weather in Istanbul: mild daytime temperatures with the year's lowest rainfall — June averages 27°C (80°F); September averages 26°C (78°F); October averages 20°C (68°F).
Istanbul climate FAQ
- What is the hottest month in Istanbul?
- August is the hottest month in Istanbul, with average daytime highs of 30°C / 86°F and overnight lows of 22°C / 71°F (averages for 2021–2025).
- What is the coldest month in Istanbul?
- February is the coldest month in Istanbul, with average highs of 10°C / 50°F and lows of 4°C / 39°F.
- How much rain does Istanbul get a year?
- Istanbul receives about 756 mm of rainfall a year, spread over roughly 104 wet days. November is the wettest month (100 mm on average) and August the driest (20 mm).
- When is the best time to visit Istanbul?
- June, September, October are the most comfortable months in Istanbul: mild daytime temperatures with the least rainfall of the year.
Want today's conditions instead of averages?
See live weather in Istanbul →Source: Open-Meteo Historical Weather API (ERA5 reanalysis), Open-Meteo. Averages are daily means across 2021–2025 and are rounded for display — for a live forecast see the Istanbul weather page.