The climate in Surrey during September can be summarized as mild and reasonably dry.
September is in the fall / autumn in Surrey and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 20°C (68°F), whilst at night 9°C (49°F) is normal.
| Daytime temperature | 19.8°C 67.6°F | 
|---|---|
| Nightly temperature | 9.2°C 48.6°F | 
| Average temperature | 14.5°C 58.1°F | 
| Daily sunshine | 6.5 hrs | 
| Avg rainfall | 72 mm 2.9 ins | 
| Rainy days | 9 days | 
| Sea temperature | 12.6°C 54.7°F | 
| Humidity | 79% | 
| Windspeed | 10.8kph 7 mph | 
On average September is the 5th driest month of the year in Surrey with around 72mm 2.9 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 9 days, although this may vary considerably.
On the flip side this corresponds to an average of 6.5 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 Surrey in September 2025.
Best places to visit in September
| Hottest month: | August | 22.2°C 72°F | 
|---|---|---|
| Driest month: | July | 45mm 1.8ins | 
| Sunniest month: | August | 8.5hrs | 
| Coldest month: | January | 5.4°C 41.7°F | 
| Wettest month: | December | 198mm 7.8ins | 
 
	 
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