Turkey
Istanbul in September: weather & travel advice
This month's data profile
Strong month under the current formula
Istanbul in September is climatically well suited to family holidays, city breaks and active holidays and hiking. The average daily high is around 25 °C. With about 7 rainy days it is moderate.
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Rank among 12 monthly averages
89/100 · #1
Warmth
#4
Dryness
#3
Sun
#6
Published best categories: Overall, City break, Active, Family
Istanbul · SeptemberPhoto: Bosphorus_Istanbul_2007.jpg: Gryffindor derivative work: Stegop · Public domainClimate facts
- Average high
- 25 °C
- Average low
- 19 °C
- Rainy days (est.)
- 7 rainy days (est.)
- Sun (est.)
- 6 h/day
- Humidity
- 68 %
Climate evidence with direct month comparison
The highlighted row is the selected month. Precipitation total and rainy days are separate monthly averages.
| Month | Avg high °C | Avg low °C | Rainy days (est.) | Precipitation mm | Sun h/day (est.) | Humidity % | Wind m/s | Score |
|---|---|---|---|---|---|---|---|---|
| August | 29 | 22 | 4 | 21 | 7.5 | 66 | 4.7 | 82 |
| September (selected) | 25 | 19 | 7 | 47 | 5.5 | 68 | 4.2 | 89 |
| October | 20 | 14 | 9 | 67 | 3.5 | 75 | 4.1 | 77 |
How do the previous and next months compare?
Baseline: September (89/100)
Positive and negative values show the change from the selected month.
| Score Δ | Average high Δ | Average low Δ | Rainy days Δ | Rain Δ | Sun Δ | Humidity Δ | Wind Δ | |
|---|---|---|---|---|---|---|---|---|
| August | -7 | +3.8 °C | +3.3 °C | -2.9 | -26.1 mm | +2 h | -1.4 % | +0.5 m/s |
| October | -12 | -5.1 °C | -4.3 °C | +2.2 | +20.2 mm | -2 h | +7.5 % | -0.1 m/s |
All twelve months in context
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Where to stay in Istanbul
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Useful next decisions
Frequently asked questions
How warm is Istanbul in September?
The average daily high is around 25 °C, with an average daily low of about 19 °C.
Does it rain a lot in Istanbul in September?
The curated estimate is about 7 rainy days per month, not a directly measured long-term average. Total precipitation averages around 47 mm for the month. A rainy day does not mean all-day rain.
When is the best time to visit Istanbul?
By the climate score, May, June, July and September are the strongest months for Istanbul. September is one of them.