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July is the hottest month in Istanbul, with an average high of 29°C / 84°F; January is the coldest (9°C / 48°F). December is the wettest month, averaging 109 mm / 4.3 in of precipitation.
| Month | High °C / °F | Low °C / °F | Precip mm / in | Wet days |
|---|---|---|---|---|
| Jan | 9 / 48 | 4 / 39 | 62 / 2.4 | 12 |
| Feb | 9 / 49 | 3 / 38 | 70 / 2.8 | 10 |
| Mar | 11 / 53 | 5 / 41 | 67 / 2.6 | 10 |
| Apr | 16 / 62 | 9 / 47 | 53 / 2.1 | 8 |
| May | 22 / 71 | 13 / 55 | 32 / 1.3 | 5 |
| Jun | 26 / 79 | 17 / 63 | 28 / 1.1 | 4 |
| Jul | 29 / 84 | 20 / 68 | 27 / 1.1 | 3 |
| Aug | 29 / 84 | 20 / 69 | 43 / 1.7 | 5 |
| Sep | 25 / 77 | 16 / 62 | 45 / 1.8 | 6 |
| Oct | 20 / 68 | 13 / 55 | 78 / 3.1 | 9 |
| Nov | 15 / 59 | 8 / 47 | 82 / 3.2 | 9 |
| Dec | 10 / 50 | 5 / 41 | 109 / 4.3 | 14 |
Extremes since 1929: highest 41°C / 105°F (August 11, 1970), lowest -10°C / 15°F (January 14, 1954).
Daylight lasts about 15.0 hours in June and 9.0 hours in December.
Data: Meteostat — Istanbul / Goztepe, 1991–2020 averages.
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