Coeur d'Alene Weather in September

What's the weather like in Coeur d'Alene (Idaho) in September 2025?

The climate in Coeur d'Alene during September can be summarized as mild and reasonably dry.

September is in the fall / autumn in Coeur d'Alene and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 23°C (72°F), whilst at night 6°C (43°F) is normal.

Coeur d'Alene weather averages (imperial / metric)
Daytime temperature 22.5°C 72.4°F
Nightly temperature 6.2°C 43.1°F
Average temperature 14.3°C 57.7°F
Daily sunshine 9.3 hrs
Avg rainfall 33 mm 1.3 ins
Rainy days 7 days
Sea temperature 12.9°C 55.2°F
Humidity 58%
Windspeed 12.2kph 8 mph

On average September is the 2nd driest month of the year in Coeur d'Alene with around 33mm 1.3 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 7 days, although this may vary considerably.

On the flip side this corresponds to an average of 9.3 hours of sunshine per day.

September temperatures in Coeur d'Alene

Coeur d'Alene average temperature in September

September rainfall

Coeur d'Alene average rain in September

September hourly sunshine

Coeur d'Alene 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 Coeur d'Alene 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

Coeur d'Alene weather stats

Coeur d'Alene weather statistics
Hottest month: July 27.8°C 82°F
Driest month: July 25mm 1ins
Sunniest month: July 13.3hrs
Coldest month: January 0.9°C 33.6°F
Wettest month: December 96mm 3.8ins
Map showing location of Coeur d'Alene (47.67768, -116.78047) Coeur d'Alene map pin © Google

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