WanderWhen

Istanbul weather in September

September is one of the best months to visit Istanbul. Expect highs around 26°C, lows near 19°C, and about 7.1 days with rain.

9.9 · Excellenttravel score for September
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Avg high
26°C
Avg low
19°C
Rainfall
49 mm
Rain days
7.1
Sunshine
10.9 h/day
Daylight
12.3 h

What to pack for Istanbul in September

  • t-shirts and light layers
  • a light jacket for evenings
  • a packable rain layer

Humidity averages 70%; max daily wind around 23 km/h.

How September compares

January: 2.9/10 JFebruary: 4.7/10 FMarch: 5.5/10 MApril: 8.7/10 AMay: 9.6/10 MJune: 9.9/10 JJuly: 9.1/10 JAugust: 9.1/10 ASeptember: 9.9/10 SOctober: 9.8/10 ONovember: 8.1/10 NDecember: 4.5/10 D

Best months in Istanbul: May–October. See the full best time to visit Istanbul guide.

Istanbul in September: the details

In September, Istanbul sees average daytime highs of 26°C (78°F) and overnight lows of 19°C (66°F). Rainfall totals roughly 49 mm across 7.1 rainy days, and the sun shines about 10.9 hours per day with 12.3 hours of daylight mid-month. Relative humidity averages 70%.

These figures are climate normals computed from the ERA5 weather reanalysis (2019–2024) for Istanbul, Turkey (41.01, 28.95) — see our methodology. Actual conditions vary year to year.

Where should you go next month?

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