The climate in Adapazarı during September can be summarized as warm and reasonably dry.
September is in the fall / autumn in Adapazarı and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 26°C (78°F), whilst at night 14°C (57°F) is normal.
| Daytime temperature | 25.6°C 78.1°F | 
|---|---|
| Nightly temperature | 13.8°C 56.8°F | 
| Average temperature | 19.7°C 67.5°F | 
| Daily sunshine | 9.3 hrs | 
| Avg rainfall | 49 mm 1.9 ins | 
| Rainy days | 7 days | 
| Sea temperature | 22.8°C 73.1°F | 
| Humidity | 71% | 
| Windspeed | 6.5kph 4 mph | 
On average September is the 4th driest month of the year in Adapazarı with around 49mm 1.9 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 7 days, although this may vary considerably.
On the flip side this corresponds to an average of 9.3 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 Adapazarı in September 2025.
Best places to visit in September
| Hottest month: | July | 28.1°C 82.6°F | 
|---|---|---|
| Driest month: | August | 46mm 1.8ins | 
| Sunniest month: | July | 12hrs | 
| Coldest month: | January | 8.7°C 47.7°F | 
| Wettest month: | December | 106mm 4.2ins |