The climate in Amherst during September can be summarized as warm and a little damp.
September is in the fall / autumn in Amherst and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 26°C (79°F), whilst at night 14°C (56°F) is normal.
Daytime temperature | 26.1°C 78.9°F |
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Nightly temperature | 13.6°C 56.4°F |
Average temperature | 19.8°C 67.6°F |
Daily sunshine | 7.9 hrs |
Avg rainfall | 84 mm 3.3 ins |
Rainy days | 8 days |
Sea temperature | 23.9°C 74.9°F |
Humidity | 73% |
Windspeed | 10.1kph 6 mph |
On average September is the 6th wettest month of the year in Amherst with around 84mm 3.3 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 8 days, although this may vary considerably.
On the flip side this corresponds to an average of 7.9 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 Amherst in September 2025.
Best places to visit in September
Hottest month: | July | 30°C 86°F |
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Driest month: | January | 70mm 2.8ins |
Sunniest month: | June | 9.9hrs |
Coldest month: | January | 6.5°C 43.7°F |
Wettest month: | July | 100mm 3.9ins |