Quincy Weather in September

What's the weather like in Quincy (California) in September 2025?

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

September is in the fall / autumn in Quincy and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 26°C (78°F), whilst at night 4°C (39°F) is normal.

Quincy weather averages (imperial / metric)
Daytime temperature 25.8°C 78.4°F
Nightly temperature 4°C 39.2°F
Average temperature 14.9°C 58.8°F
Daily sunshine 11.8 hrs
Avg rainfall 22 mm 0.9 ins
Rainy days 4 days
Sea temperature 15.4°C 59.6°F
Humidity 51%
Windspeed 11.5kph 7 mph

On average September is the 4th driest month of the year in Quincy with around 22mm 0.9 inches of rain making it a dry time to visit. This rainfall is typically spread over 4 days, although this may vary considerably.

On the flip side this corresponds to an average of 11.8 hours of sunshine per day.

September temperatures in Quincy

Quincy average temperature in September

September rainfall

Quincy average rain in September

September hourly sunshine

Quincy 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 Quincy 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

Quincy weather stats

Quincy weather statistics
Hottest month: July 29.4°C 84.9°F
Driest month: July 5mm 0.2ins
Sunniest month: July 14.3hrs
Coldest month: January 6.8°C 44.2°F
Wettest month: January 199mm 7.8ins
Map showing location of Quincy (39.93684, -120.94718) Quincy map pin © Google

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