Republic Weather in September

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

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

September is in the fall / autumn in Republic and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a cool 21°C (69°F), whilst at night 4°C (40°F) is normal.

Republic weather averages (imperial / metric)
Daytime temperature	20.8°C 69.4°F
Nightly temperature	4.3°C 39.7°F
Average temperature	12.5°C 54.5°F
Daily sunshine	7.5 hrs
Avg rainfall	22 mm 0.9 ins
Rainy days	6 days
Sea temperature	12.3°C 54.2°F
Humidity	61%
Windspeed	10.1kph 6 mph

On average September is the driest month of the year in Republic with around 22mm 0.9 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 7.5 hours of sunshine per day.

September temperatures in Republic

Republic average temperature in September

September rainfall

September hourly sunshine

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 Republic 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

Republic weather stats

Republic weather statistics
Hottest month:	July	25.9°C 78.6°F
Driest month:	September	22mm 0.9ins
Sunniest month:	August	9.5hrs
Coldest month:	January	-2.5°C 27.5°F
Wettest month:	December	53mm 2.1ins

Map showing location of Republic (48.64822, -118.73781)