Blackfoot Weather in September

What's the weather like in Blackfoot (Idaho) in September 2025?

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

September is in the fall / autumn in Blackfoot and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 23°C (74°F), whilst at night 5°C (41°F) is normal.

Blackfoot weather averages (imperial / metric)
Daytime temperature 23.4°C 74°F
Nightly temperature 4.9°C 40.7°F
Average temperature 14.1°C 57.4°F
Daily sunshine 10.4 hrs
Avg rainfall 20 mm 0.8 ins
Rainy days 6 days
Sea temperature 15.1°C 59.1°F
Humidity 48%
Windspeed 14.8kph 9 mph

On average September is the 4th driest month of the year in Blackfoot with around 20mm 0.8 inches of rain making it a dry time to visit. This rainfall is typically spread over 6 days, although this may vary considerably.

On the flip side this corresponds to an average of 10.4 hours of sunshine per day.

September temperatures in Blackfoot

Blackfoot average temperature in September

September rainfall

Blackfoot average rain in September

September hourly sunshine

Blackfoot 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 Blackfoot 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

Blackfoot weather stats

Blackfoot weather statistics
Hottest month: July 30.1°C 86.2°F
Driest month: August 14mm 0.6ins
Sunniest month: July 13.2hrs
Coldest month: January -1.7°C 28.9°F
Wettest month: May 31mm 1.2ins
Map showing location of Blackfoot (43.19047, -112.34498) Blackfoot map pin © Google

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