The climate in Yalova during September can be summarized as warm and reasonably dry.
September is in the fall / autumn in Yalova and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 24°C (76°F), whilst at night 14°C (57°F) is normal.
| Daytime temperature | 24.4°C 75.9°F | 
|---|---|
| Nightly temperature | 13.8°C 56.8°F | 
| Average temperature | 19.1°C 66.4°F | 
| Daily sunshine | 10 hrs | 
| Avg rainfall | 46 mm 1.8 ins | 
| Rainy days | 6 days | 
| Sea temperature | 22.6°C 72.7°F | 
| Humidity | 71% | 
| Windspeed | 8.3kph 5 mph | 
On average September is the 5th driest month of the year in Yalova with around 46mm 1.8 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 6 days, although this may vary considerably.
On the flip side this corresponds to an average of 10 hours of sunshine per day.
				
						
						The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Yalova in September 2025.
Best places to visit in September
| Hottest month: | July | 27.2°C 81°F | 
|---|---|---|
| Driest month: | July | 23mm 0.9ins | 
| Sunniest month: | July | 13hrs | 
| Coldest month: | January | 8.1°C 46.6°F | 
| Wettest month: | December | 122mm 4.8ins |