Istanbul
September
Weather in Istanbul for September 2025
Your guide to Istanbul weather in September - trends and predictions
In general, the average temperature in Istanbul at the beginning of September is 27.6 °C. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 24.6 °C by the end of September.
Istanbul sees moderate rainfall in September, averaging 6 rainy days.
Is September a good time to visit Istanbul? check out the best time to travel to Istanbul page.
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24
Dry days
6
Rainy days
0
Snow days
26°/21°
Temperatures
26 km/h
Avg max wind
61 %
Avg humidity
Istanbul in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  27° | 2 28° | 3 28° | 4 28° | 5  27° | 6  28° | 7 27° |
| 8  26° | 9 26° | 10 26° | 11  26° | 12 26° | 13 27° | 14 27° |
| 15 26° | 16 24° | 17 24° | 18  24° | 19 24° | 20 24° | 21 24° |
| 22 26° | 23 26° | 24 26° | 25 25° | 26 25° | 27 26° | 28 25° |
| 29 24° | 30 21° |
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Temperatures trend during September in Istanbul
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Sunny | 27° /22° | 1.7 mm | 7 | |
| 2 Sept. | Sunny | 28° /23° | 5.4 mm | 7 | |
| 3 Sept. | Sunny | 28° /23° | 0.1 mm | 7 | |
| 4 Sept. | Sunny | 28° /22° | 0 mm | 7 | |
| 5 Sept. | Thundery outbreaks possible | 27° /22° | 0.2 mm | 7 | |
| 6 Sept. | Light rain shower | 28° /22° | 0.3 mm | 7 | |
| 7 Sept. | Sunny | 27° /22° | 0.3 mm | 7 | |
| 8 Sept. | Partly cloudy | 26° /22° | 0.5 mm | 7 | |
| 9 Sept. | Sunny | 26° /21° | 0.1 mm | 7 | |
| 10 Sept. | Partly cloudy | 26° /21° | 0 mm | 7 | |
| 11 Sept. | Overcast | 26° /20° | 3.6 mm | 6 | |
| 12 Sept. | Partly cloudy | 26° /22° | 0.8 mm | 7 | |
| 13 Sept. | Sunny | 27° /21° | 0 mm | 7 | |
| 14 Sept. | Partly cloudy | 27° /21° | 0 mm | 7 | |
| 15 Sept. | Sunny | 26° /19° | 7.1 mm | 7 | |
| 16 Sept. | Partly cloudy | 24° /19° | 0.1 mm | 6 | |
| 17 Sept. | Patchy rain possible | 24° /20° | 0.2 mm | 6 | |
| 18 Sept. | Cloudy | 24° /20° | 0 mm | 5 | |
| 19 Sept. | Partly cloudy | 24° /20° | 0.1 mm | 6 | |
| 20 Sept. | Overcast | 24° /19° | 4.4 mm | 5 | |
| 21 Sept. | Sunny | 24° /18° | 11.5 mm | 6 | |
| 22 Sept. | Partly cloudy | 26° /20° | 0 mm | 6 | |
| 23 Sept. | Sunny | 26° /20° | 0 mm | 6 | |
| 24 Sept. | Sunny | 26° /20° | 0 mm | 7 | |
| 25 Sept. | Overcast | 25° /20° | 0 mm | 7 | |
| 26 Sept. | Patchy rain possible | 25° /20° | 0 mm | 6 | |
| 27 Sept. | Patchy rain possible | 26° /20° | 0 mm | 7 | |
| 28 Sept. | Thundery outbreaks possible | 25° /20° | 2.4 mm | 6 | |
| 29 Sept. | Patchy rain possible | 24° /19° | 0.7 mm | 6 | |
| 30 Sept. | Light rain shower | 21° /16° | 4.6 mm | 5 | |
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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.
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 26° and lows near 21°, suitable for diverse activities and preferences.
How much rainfall should be expected in Istanbul during September?
Rainfall in Istanbul during September is rare to nonexistent, with the total expected rainfall being less than 10 mm and approximately 6 days seeing any precipitation. Planning without the concern for rain is generally straightforward during this very dry period.
What are the typical wind conditions in Istanbul during September?
The average wind speed in Istanbul during September is 26 km/h, suggesting breezy to windy conditions, depending on your activities.
What to pack to Istanbul in September?
As you prepare for your trip to Istanbul in September, it's important to consider the typical weather patterns for the time of year. Below is a carefully tailored packing list to ensure that your time in Istanbul, during September, is comfortable and enjoyable, regardless of the weather conditions.
- Clothing
- Lightweight Clothing: T-shirts, blouses, shorts, skirts
- Rain Gear: Lightweight, waterproof clothing
- Accessories
- Sunglasses: For sun protection
- Sun Hats: Wide-brimmed hats for sun protection in warm weather
- Umbrellas/Raincoats: For rainy days
- Personal Items
- Sunscreen: High SPF for sunny destinations
- Lip Balm with SPF: To protect against chapped lips
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