Forsyth Weather in September

What's the weather like in Forsyth (Montana) in September 2025?

The climate in Forsyth during September can be summarized as mild and reasonably dry.

September is in the fall / autumn in Forsyth and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 24°C (74°F), whilst at night 7°C (44°F) is normal.

Forsyth weather averages (imperial / metric)
Daytime temperature 23.5°C 74.3°F
Nightly temperature 6.5°C 43.7°F
Average temperature 15°C 59°F
Daily sunshine 9.1 hrs
Avg rainfall 36 mm 1.4 ins
Rainy days 7 days
Sea temperature 14.3°C 57.7°F
Humidity 54%
Windspeed 15.8kph 10 mph

On average September is the 3rd wettest month of the year in Forsyth with around 36mm 1.4 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 9.1 hours of sunshine per day.

September temperatures in Forsyth

Forsyth average temperature in September

September rainfall

Forsyth average rain in September

September hourly sunshine

Forsyth average rain in September

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 Forsyth in September 2025.

Other monthly averages

Best places to visit in September

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Forsyth weather stats

Forsyth weather statistics
Hottest month: July 31.4°C 88.5°F
Driest month: February 12mm 0.5ins
Sunniest month: July 12.5hrs
Coldest month: January -2.1°C 28.2°F
Wettest month: June 67mm 2.6ins
Map showing location of Forsyth (46.26638, -106.67781) Forsyth map pin © Google

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