Asotin Weather in September

What's the weather like in Asotin (Washington) in September 2025?

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

September is in the fall / autumn in Asotin and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a comfortable 25°C (76°F), whilst at night 9°C (48°F) is normal.

Asotin weather averages (imperial / metric)
Daytime temperature 24.7°C 76.4°F
Nightly temperature 9°C 48.1°F
Average temperature 16.8°C 62.2°F
Daily sunshine 10.1 hrs
Avg rainfall 21 mm 0.8 ins
Rainy days 6 days
Sea temperature 13.2°C 55.8°F
Humidity 52%
Windspeed 13.3kph 8 mph

On average September is the 3rd driest month of the year in Asotin with around 21mm 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 10.1 hours of sunshine per day.

September temperatures in Asotin

Asotin average temperature in September

September rainfall

Asotin average rain in September

September hourly sunshine

Asotin 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 Asotin 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

Asotin weather stats

Asotin weather statistics
Hottest month: July 30.5°C 86.9°F
Driest month: July 17mm 0.7ins
Sunniest month: July 14.5hrs
Coldest month: January 3.4°C 38.1°F
Wettest month: January 41mm 1.6ins
Map showing location of Asotin (46.33933, -117.04821) Asotin map pin © Google

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