The Dalles Weather in September

What's the weather like in The Dalles (Oregon) in September 2025?

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

September is in the fall / autumn in The Dalles and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 24°C (76°F), whilst at night 7°C (44°F) is normal.

The Dalles weather averages (imperial / metric)
Daytime temperature 24.3°C 75.7°F
Nightly temperature 6.6°C 43.8°F
Average temperature 15.4°C 59.7°F
Daily sunshine 9.2 hrs
Avg rainfall 19 mm 0.8 ins
Rainy days 5 days
Sea temperature 13°C 55.5°F
Humidity 59%
Windspeed 11.9kph 7 mph

On average September is the 4th driest month of the year in The Dalles with around 19mm 0.8 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 9.2 hours of sunshine per day.

September temperatures in The Dalles

The Dalles average temperature in September

September rainfall

The Dalles average rain in September

September hourly sunshine

The Dalles 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 The Dalles 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

The Dalles weather stats

The Dalles weather statistics
Hottest month: July 28.6°C 83.5°F
Driest month: July 6mm 0.2ins
Sunniest month: July 12.3hrs
Coldest month: January 4.1°C 39.4°F
Wettest month: January 102mm 4ins
Map showing location of The Dalles (45.59456, -121.17868) The Dalles map pin © Google

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