Ellensburg Weather in September

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

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

September is in the fall / autumn in Ellensburg and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 22°C (72°F), whilst at night 6°C (43°F) is normal.

Ellensburg weather averages (imperial / metric)
Daytime temperature 22°C 71.5°F
Nightly temperature 5.9°C 42.5°F
Average temperature 13.9°C 57°F
Daily sunshine 8.5 hrs
Avg rainfall 12 mm 0.5 ins
Rainy days 5 days
Sea temperature 12.9°C 55.2°F
Humidity 59%
Windspeed 11.9kph 7 mph

On average September is the 3rd driest month of the year in Ellensburg with around 12mm 0.5 inches of rain making it a dry time to visit. This rainfall is typically spread over 5 days, although this may vary considerably.

On the flip side this corresponds to an average of 8.5 hours of sunshine per day.

September temperatures in Ellensburg

Ellensburg average temperature in September

September rainfall

Ellensburg average rain in September

September hourly sunshine

Ellensburg 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 Ellensburg 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

Ellensburg weather stats

Ellensburg weather statistics
Hottest month: July 26.7°C 80.1°F
Driest month: July 8mm 0.3ins
Sunniest month: July 11.5hrs
Coldest month: January 0.2°C 32.4°F
Wettest month: December 58mm 2.3ins
Map showing location of Ellensburg (46.99651, -120.54785) Ellensburg map pin © Google

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