Weather in Istanbul for September 2026
In general, the average temperature in Istanbul at the beginning of September is 27.1 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 23.6 °C by the end of September.
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.
Is September a good time to visit Istanbul? check out the best time to travel to Istanbul page.
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Istanbul Weather September
Temperatures trend during September in Istanbul
September weather in Istanbul day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Sunny | 29° /22° | 1.2 mm | 6 | |
| 2 Sept. | Sunny | 28° /22° | 2.6 mm | 7 | |
| 3 Sept. | Sunny | 28° /22° | 0.3 mm | 6 | |
| 4 Sept. | Sunny | 27° /21° | 0.4 mm | 7 | |
| 5 Sept. |  Patchy rain possible | 26° /21° | 0.4 mm | 6 | |
| 6 Sept. | Patchy rain possible | 26° /21° | 0.5 mm | 6 | |
| 7 Sept. | Patchy rain possible | 26° /21° | 0.4 mm | 6 | |
| 8 Sept. |  Partly cloudy | 26° /21° | 0.4 mm | 6 | |
| 9 Sept. | Sunny | 27° /20° | 0.1 mm | 7 | |
| 10 Sept. | Partly cloudy | 26° /20° | 0.6 mm | 7 | |
| 11 Sept. |  Cloudy | 26° /20° | 1.4 mm | 6 | |
| 12 Sept. | Patchy rain possible | 26° /20° | 1.2 mm | 6 | |
| 13 Sept. | Partly cloudy | 25° /20° | 0.9 mm | 6 | |
| 14 Sept. | Sunny | 26° /19° | 0 mm | 7 | |
| 15 Sept. | Sunny | 26° /19° | 2.9 mm | 6 | |
| 16 Sept. | Patchy rain possible | 26° /20° | 0.2 mm | 7 | |
| 17 Sept. | Sunny | 26° /19° | 0.1 mm | 6 | |
| 18 Sept. | Patchy rain possible | 25° /20° | 2.3 mm | 6 | |
| 19 Sept. | Partly cloudy | 24° /19° | 0.4 mm | 6 | |
| 20 Sept. | Sunny | 25° /18° | 1.8 mm | 6 | |
| 21 Sept. | Patchy rain possible | 24° /18° | 5.1 mm | 6 | |
| 22 Sept. | Cloudy | 23° /18° | 4.4 mm | 6 | |
| 23 Sept. | Sunny | 23° /17° | 2.6 mm | 5 | |
| 24 Sept. | Sunny | 24° /17° | 0 mm | 6 | |
| 25 Sept. | Sunny | 25° /18° | 0 mm | 6 | |
| 26 Sept. | Patchy rain possible | 24° /18° | 0.1 mm | 6 | |
| 27 Sept. | Sunny | 24° /19° | 0.2 mm | 6 | |
| 28 Sept. | Patchy rain possible | 23° /18° | 1 mm | 5 | |
| 29 Sept. | Patchy rain possible | 23° /19° | 0.4 mm | 6 | |
| 30 Sept. | Patchy rain possible | 22° /17° | 1.9 mm | 5 | |
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Istanbul weather in September vs August vs October
| August | September | October | |
|---|---|---|---|
| Weather | Sunny | Patchy rain possible | Patchy rain possible |
| Temperatures | 30°/23° | 25°/20° | 20°/16° |
| Rainfall | 16 mm | 41 mm | 20 mm |
| Wind | 24.3 km/h | 23.2 km/h | 22 km/h |
| Humidity | 61% | 60% | 65% |
| Rainy days | 6 days | 13 days | 9 days |
| Dry days | 25 days | 17 days | 22 days |
Planning a trip to Istanbul? Discover the best time to visit
Istanbul in September - FAQ
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
- Layered Clothing: Light sweaters, long-sleeve shirts, light jackets, and comfortable pants
- Rain Gear: Lightweight, waterproof clothing
- Footwear
- Waterproof Shoes
- Accessories
- Sunglasses: For sun protection
- Sun Hats: Wide-brimmed hats for sun protection in warm weather
- Umbrellas/Raincoats: For rainy days
September rainfall patterns in Istanbul
UV exposure in Istanbul during September
Quick links
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.