The climate in Helena Valley Southeast during September can be summarized as mild and dry.
September is in the fall / autumn in Helena Valley Southeast and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a cool 21°C (70°F), whilst at night 5°C (41°F) is normal.
Daytime temperature | 20.9°C 69.6°F |
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Nightly temperature | 4.7°C 40.5°F |
Average temperature | 12.8°C 55°F |
Daily sunshine | 9.2 hrs |
Avg rainfall | 27 mm 1.1 ins |
Rainy days | 7 days |
Sea temperature | 13.8°C 56.8°F |
Humidity | 55% |
Windspeed | 13.7kph 9 mph |
On average September is the 5th wettest month of the year in Helena Valley Southeast with around 27mm 1.1 inches of rain making it a 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 9.2 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 Valley Southeast in September 2024.
Best places to visit in September
Hottest month: | July | 28.8°C 83.8°F |
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Driest month: | February | 11mm 0.4ins |
Sunniest month: | July | 12.8hrs |
Coldest month: | January | -1.4°C 29.5°F |
Wettest month: | June | 52mm 2ins |