Istanbul · Türkiye · 1995–2024 averages
Istanbul weather, month by month. September is the pick.
Thirty years of averages for Istanbul, Türkiye — how hot it really feels, when the rain arrives, and what the air is like. September comes out on top; January is the one to skip.
The year at a glance
Tap a month for its full breakdown.
September
bestscore 82.5/100Mild, sticky and dryish, with moderate air.
- Feels like
- 24°
- mild
- Real temp
- 24°
- mild
- Humidity
- 72%
- sticky
- Rain
- 49mm
- dryish
- Cloud cover
- 35%
- bright
- Air quality
- 65
- moderate
- Daylight
- 12.5h
- even
Month by month, metric by metric
Each strip covers the same twelve months, so you can see where the rain lands and how the air shifts with it.
Feels like
peaks at 30° in July
Real temp
9–28° in the shade across the year
Humidity
71% at its driest, 80% at its most oppressive
Rain
97mm in December, 23mm in July
Cloud cover
19% at its clearest, 68% at its greyest
Air quality
worst in March, cleanest in July
Daylight
9.3h to 15.1h of daylight across the year
Istanbul's air, month by month
The air is at its worst in March at 83 AQI (moderate), and at its cleanest in July at 61 (moderate). It tracks the seasons closely.
Every month in full
All twelve months, all seven measures.
| Month | Feels like | Real temp | Humidity | Rain | Cloud cover | Air quality | Daylight |
|---|---|---|---|---|---|---|---|
| January | 5° cold | 9° cold | 80% sweaty | 90mm some rain | 68% mixed | 74 moderate | 9.6h short |
| February | 6° cold | 9° cold | 79% sweaty | 73mm dryish | 64% mixed | 79 moderate | 10.6h shortish |
| March | 8° cold | 11° cold | 77% sweaty | 76mm some rain | 60% mixed | 83 moderate | 12h even |
| April | 14° cool | 16° cool | 76% sweaty | 50mm dryish | 53% bright | 79 moderate | 13.3h even |
| May | 21° mild | 21° mild | 76% sweaty | 38mm dryish | 46% bright | 71 moderate | 14.5h long days |
| June | 27° mild | 25° mild | 74% sticky | 38mm dryish | 31% clear | 68 moderate | 15.1h long days |
| July | 30° warm | 28° warm | 71% sticky | 23mm dry | 19% clear | 61 moderate | 14.8h long days |
| August | 29° warm | 28° warm | 72% sticky | 23mm dry | 21% clear | 62 moderate | 13.8h even |
| September | 24° mild | 24° mild | 72% sticky | 49mm dryish | 35% bright | 65 moderate | 12.5h even |
| October | 18° cool | 19° cool | 77% sweaty | 71mm dryish | 50% bright | 71 moderate | 11.1h shortish |
| November | 13° cold | 15° cool | 79% sweaty | 76mm some rain | 59% mixed | 75 moderate | 9.9h short |
| December | 7° cold | 11° cold | 79% sweaty | 97mm some rain | 67% mixed | 74 moderate | 9.3h short |
Istanbul weather questions
- What is the best time to visit Istanbul?
- September scores best across temperature, rain, humidity and air quality — 24° feels-like, 49mm of rain and 72% humidity. January is the month to avoid: 90mm of rain and 74 AQI.
- How hot does Istanbul get?
- July is the peak, at 30° feels-like (28° in the shade) — warm. Even in September it reaches 24°.
- When is the rainy season in Istanbul?
- December is the wettest month at 97mm, and July the driest at just 23mm.
- Is air quality a problem in Istanbul?
- March is the worst month at 83 AQI (moderate), and July the best at 61 (moderate).
Weather normals from Open-Meteo (ERA5 reanalysis, 1995–2024) and CAMS air quality (2015–2024), licensed CC-BY-4.0. Contains modified Copernicus Climate Change Service information. These are long-run averages, not forecasts — any given year will differ.
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