Merced Weather in September

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

The climate in Merced during September can be summarized as warm and very dry.

September is in the fall / autumn in Merced and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a comfortable 32°C (89°F), whilst at night 13°C (55°F) is normal.

Merced weather averages (imperial / metric)
Daytime temperature 31.6°C 88.9°F
Nightly temperature 12.6°C 54.7°F
Average temperature 22.1°C 71.8°F
Daily sunshine 12 hrs
Avg rainfall 5 mm 0.2 ins
Rainy days 1 days
Sea temperature 16°C 60.7°F
Humidity 53%
Windspeed 11.9kph 7 mph

On average September is the 4th driest month of the year in Merced with around 5mm 0.2 inches of rain making it a very dry time to visit.

On the flip side this corresponds to an average of 12 hours of sunshine per day.

September temperatures in Merced

Merced average temperature in September

September rainfall

Merced average rain in September

September hourly sunshine

Merced 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 Merced 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

Merced weather stats

Merced weather statistics
Hottest month: July 35.1°C 95.2°F
Driest month: July 1mm 0ins
Sunniest month: July 14.3hrs
Coldest month: December 11.8°C 53.2°F
Wettest month: January 59mm 2.3ins
Map showing location of Merced (37.30216, -120.48297) Merced map pin © Google

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