Istanbul, Turkey is most comfortable in January, February, March. The toughest month for heat is July (comfort 17/100). In August, daytime highs average 29.9°C (feels like 30.8°C) with 13 days over 30°C and 25.6 tropical nights.
| Month | Avg high | Avg low | Feels like | Days ≥30°C | Days ≥35°C | Nights ≥20°C | Comfort |
|---|---|---|---|---|---|---|---|
| January | 10.5° | 4.7° | 7.2° | 0 | 0 | 0 | 100 |
| February | 10.1° | 3.7° | 6.8° | 0 | 0 | 0 | 100 |
| March | 12.4° | 4.9° | 9.5° | 0 | 0 | 0 | 100 |
| April | 16.8° | 8.8° | 15.3° | 0 | 0 | 0 | 100 |
| May | 21.4° | 12.5° | 21° | 0.8 | 0 | 0 | 99 |
| June | 26.7° | 18° | 27.7° | 5 | 0.2 | 5 | 67 |
| July | 30.2° | 21° | 31.3° | 15 | 1.4 | 22.6 | 17 |
| August | 29.9° | 21.5° | 30.8° | 13 | 1.2 | 25.6 | 20 |
| September | 25.5° | 17.7° | 25.2° | 1.4 | 0 | 6.4 | 86 |
| October | 20.1° | 13.3° | 18.7° | 0.2 | 0 | 0.2 | 100 |
| November | 16.8° | 10.4° | 14.8° | 0 | 0 | 0 | 100 |
| December | 12.4° | 7° | 9.8° | 0 | 0 | 0 | 100 |
Destinations scoring 75+ for August heat comfort:
It's hot but manageable. August daytime highs in Istanbul average 29.9°C with 13 days over 30°C. Plan outdoor sightseeing for mornings and evenings.
Based on 5 years of climate data, the most comfortable months in Istanbul are January, February, March. The toughest month for heat is July, scoring 17/100 on our heat-comfort index.
In August, nights in Istanbul average a low of 21.5°C, with 25.6 tropical nights per month (nights that stay at or above 20°C) — a key factor for sleep quality if your stay has no air conditioning.
Tell us where and when you're going. If a heatwave becomes likely for your dates, we'll email you early — with cooler day-by-day alternatives nearby.