Salmon Weather in September

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

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

September is in the fall / autumn in Salmon and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a cool 22°C (71°F), whilst at night 3°C (38°F) is normal.

Salmon weather averages (imperial / metric)
Daytime temperature 21.8°C 71.2°F
Nightly temperature 3.2°C 37.8°F
Average temperature 12.5°C 54.5°F
Daily sunshine 9.9 hrs
Avg rainfall 22 mm 0.9 ins
Rainy days 7 days
Sea temperature 14°C 57.3°F
Humidity 55%
Windspeed 13.3kph 8 mph

On average September is the 5th wettest month of the year in Salmon with around 22mm 0.9 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 9.9 hours of sunshine per day.

September temperatures in Salmon

Salmon average temperature in September

September rainfall

Salmon average rain in September

September hourly sunshine

Salmon 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 Salmon 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

Salmon weather stats

Salmon weather statistics
Hottest month: July 28.6°C 83.5°F
Driest month: February 15mm 0.6ins
Sunniest month: July 13.2hrs
Coldest month: January -1.6°C 29.1°F
Wettest month: June 42mm 1.7ins
Map showing location of Salmon (45.17575, -113.8959) Salmon map pin © Google

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