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Weather in Istanbul for September 2025

Your guide to Istanbul weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Istanbul has been nearly identical to the historical average, with a temperature of 27 °C (showing only a slight deviation of 0.4 °C).

  • Expect cooler weather in the next days in Istanbul with the forecast suggesting a temperature of 25.3 °C, lower than the historical average.

  • In general, the average temperature in Istanbul at the beginning of September is 27.1 °C. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 25 °C by the end of September.

    • Rain 🌧️

  • The climate of Istanbul in September is notably wet, with an average of 13 rainy days, and a total of 41.2 mm of precipitation.

Average dry days
17
Dry days
Average rainy days
13
Rainy days
Average snowy days
0
Snow days
Average temperatures
25°/20°
Temperatures
Average wind speed
23 km/h
Avg max wind
Average humidity
60 %
Avg humidity

Istanbul Weather September

Move between months or click on a day
August
October
Mon.Tue.Wed.Thu.Fri.Sat.Sun.
1
Sunny
29°
2
Sunny
28°
3
Sunny
28°
4
Sunny
27°
5
Patchy rain possible
26°
6
Patchy rain possible
26°
7
Patchy rain possible
26°
8
Partly cloudy
26°
9
Sunny
27°
10
Partly cloudy
26°
11
Cloudy
26°
12
Patchy rain possible
26°
13
Partly cloudy
25°
14
Sunny
27°
15
Sunny
25°
16
Sunny
26°
17
Patchy rain possible
26°
18
Patchy rain possible
22°
19
Partly cloudy
23°
20
Sunny
25°
21
Sunny
26°
22
Sunny
25°
23
Sunny
26°
24
Sunny
26°
25
Sunny
27°
26
Partly cloudy
25°
27
Sunny
27°
28
Partly cloudy
24°
29
Patchy rain possible
24°
30
Light rain shower
22°

Temperatures trend during September in Istanbul

See the weather trend as well as the moving average line

September weather in Istanbul day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Sunny
Sunny
 29° /22° 1.2 mm 6
2 Sept. Sunny
Sunny
 28° /22° 2.6 mm 7
3 Sept. Sunny
Sunny
 28° /22° 0.3 mm 6
4 Sept. Sunny
Sunny
 27° /21° 0.4 mm 7
5 Sept. Patchy rain possible
Patchy rain possible
 26° /21° 0.4 mm 6
6 Sept. Patchy rain possible
Patchy rain possible
 26° /21° 0.5 mm 6
7 Sept. Patchy rain possible
Patchy rain possible
 26° /21° 0.4 mm 6
8 Sept. Partly cloudy
Partly cloudy
 26° /21° 0.4 mm 6
9 Sept. Sunny
Sunny
 27° /20° 0.1 mm 7
10 Sept. Partly cloudy
Partly cloudy
 26° /20° 0.6 mm 7
11 Sept. Cloudy
Cloudy
 26° /20° 1.4 mm 6
12 Sept. Patchy rain possible
Patchy rain possible
 26° /20° 1.2 mm 6
13 Sept. Partly cloudy
Partly cloudy
 25° /20° 0.9 mm 6
14 Sept. Sunny
Sunny
 27° /19° 0 mm 7
15 Sept. Sunny
Sunny
 25° /19° 0 mm 1.4
16 Sept. Sunny
Sunny
 26° /20° 0 mm 1.5
17 Sept. Patchy rain possible
Patchy rain possible
 26° /18° 1.1 mm 1.4
18 Sept. Patchy rain possible
Patchy rain possible
 22° /17° 0.8 mm 1.7
19 Sept. Partly cloudy
Partly cloudy
 23° /19° 0 mm 6
20 Sept. Sunny
Sunny
 25° /19° 0 mm 6
21 Sept. Sunny
Sunny
 26° /20° 0 mm 6
22 Sept. Sunny
Sunny
 25° /20° 0 mm 6
23 Sept. Sunny
Sunny
 26° /20° 0 mm 6
24 Sept. Sunny
Sunny
 26° /19° 0 mm 6
25 Sept. Sunny
Sunny
 27° /20° 0 mm 6
26 Sept. Partly cloudy
Partly cloudy
 25° /20° 0 mm 6
27 Sept. Sunny
Sunny
 27° /19° 0 mm 6
28 Sept. Partly cloudy
Partly cloudy
 24° /19° 1.2 mm 6
29 Sept. Patchy rain possible
Patchy rain possible
 24° /19° 0.4 mm 6
30 Sept. Light rain shower
Light rain shower
 22° /17° 2.4 mm 5
Next
Important Notice
Our weather forecast for Istanbul in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Istanbul forecast closer to your planned date for the most up-to-date weather information.
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Istanbul in September - FAQ

What are the expected maximum and minimum temperatures in Istanbul during September?
During September, expect a variety of temperatures with highs around 25° and lows near 20°, suitable for diverse activities and preferences.
How much rainfall should be expected in Istanbul during September?
In September, Istanbul can expect light to moderate rainfall, totaling 41.2 mm across approximately 13 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in Istanbul during September?
The average wind speed in Istanbul during September is 23 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Istanbul

Explore the daily rainfall trends and prepare for Istanbuls September weather 💧

UV exposure in Istanbul during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️

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Location coordinates Where is Istanbul?

Get accurate weather forecasts for Istanbul, located at latitude 41.014 and longitude 28.95. Stay updated with localized weather information tailored for Istanbul.

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