The climate in Helena during September can be summarized as mild and dry.
September is in the fall / autumn in Helena and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a cool 20°C (69°F), whilst at night 4°C (39°F) is normal.
Daytime temperature | 20.4°C 68.6°F |
---|---|
Nightly temperature | 4.1°C 39.3°F |
Average temperature | 12.2°C 54°F |
Daily sunshine | 9.1 hrs |
Avg rainfall | 30 mm 1.2 ins |
Rainy days | 8 days |
Sea temperature | 13.7°C 56.7°F |
Humidity | 55% |
Windspeed | 13.7kph 9 mph |
On average September is the 5th wettest month of the year in Helena with around 30mm 1.2 inches of rain making it a dry 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 9.1 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 Helena in September 2024.
Best places to visit in September
Hottest month: | July | 27.9°C 82.2°F |
---|---|---|
Driest month: | February | 12mm 0.5ins |
Sunniest month: | July | 12.8hrs |
Coldest month: | January | -1.3°C 29.7°F |
Wettest month: | June | 55mm 2.2ins |