Okanogan Weather in September

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

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

September is in the fall / autumn in Okanogan and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 24°C (75°F), whilst at night 7°C (45°F) is normal.

Okanogan weather averages (imperial / metric)
Daytime temperature 23.7°C 74.7°F
Nightly temperature 7.1°C 44.8°F
Average temperature 15.4°C 59.7°F
Daily sunshine 7.7 hrs
Avg rainfall 14 mm 0.6 ins
Rainy days 5 days
Sea temperature 12.3°C 54.1°F
Humidity 60%
Windspeed 9.7kph 6 mph

On average September is the 2nd driest month of the year in Okanogan with around 14mm 0.6 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 7.7 hours of sunshine per day.

September temperatures in Okanogan

Okanogan average temperature in September

September rainfall

Okanogan average rain in September

September hourly sunshine

Okanogan 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 Okanogan 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

Okanogan weather stats

Okanogan weather statistics
Hottest month: July 28.9°C 84°F
Driest month: July 13mm 0.5ins
Sunniest month: July 10.5hrs
Coldest month: January -0.5°C 31.1°F
Wettest month: December 39mm 1.5ins
Map showing location of Okanogan (48.36126, -119.58339) Okanogan map pin © Google

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