Coupeville Weather in September

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

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

September is in the fall / autumn in Coupeville and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around 19°C (66°F), whilst at night 9°C (49°F) is normal.

Coupeville weather averages (imperial / metric)
Daytime temperature 19.1°C 66.3°F
Nightly temperature 9.2°C 48.5°F
Average temperature 14.1°C 57.4°F
Daily sunshine 7.4 hrs
Avg rainfall 32 mm 1.2 ins
Rainy days 9 days
Sea temperature 12.8°C 55°F
Humidity 78%
Windspeed 10.4kph 7 mph

On average September is the 4th driest month of the year in Coupeville with around 32mm 1.2 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 9 days, although this may vary considerably.

On the flip side this corresponds to an average of 7.4 hours of sunshine per day.

September temperatures in Coupeville

Coupeville average temperature in September

September rainfall

Coupeville average rain in September

September hourly sunshine

Coupeville 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 Coupeville 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

Coupeville weather stats

Coupeville weather statistics
Hottest month: August 20.9°C 69.6°F
Driest month: July 20mm 0.8ins
Sunniest month: July 10.9hrs
Coldest month: January 7.5°C 45.5°F
Wettest month: December 81mm 3.2ins
Map showing location of Coupeville (48.21982, -122.68628) Coupeville map pin © Google

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