Castro Valley Weather in September

What's the weather like in Castro Valley (California) in September 2024?

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

September is in the fall / autumn in Castro Valley and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around a comfortable 25°C (77°F), whilst at night 12°C (54°F) is normal.

Castro Valley weather averages (imperial / metric)
Daytime temperature 25.2°C 77.4°F
Nightly temperature 12.4°C 54.3°F
Average temperature 18.8°C 65.8°F
Daily sunshine 10.4 hrs
Avg rainfall 7 mm 0.3 ins
Rainy days 2 days
Sea temperature 14.4°C 57.9°F
Humidity 66%
Windspeed 15.8kph 10 mph

On average September is the 4th driest month of the year in Castro Valley with around 7mm 0.3 inches of rain making it a very dry time to visit.

On the flip side this corresponds to an average of 10.4 hours of sunshine per day.

September temperatures in Castro Valley

Castro Valley average temperature in September

September rainfall

Castro Valley average rain in September

September hourly sunshine

Castro Valley 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 Castro Valley in September 2024.

Other monthly averages

Best places to visit in September

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Castro Valley weather stats

Castro Valley weather statistics
Hottest month: August 25°C 77°F
Driest month: July 2mm 0.1ins
Sunniest month: April 11.2hrs
Coldest month: January 13°C 55.4°F
Wettest month: January 107mm 4.2ins
Map showing location of Castro Valley (37.6941, -122.08635) Castro Valley map pin © Google

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