San Marcos Weather in September

What's the weather like in San Marcos (California) in September 2024?

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

September is in the fall / autumn in San Marcos and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around a comfortable 28°C (82°F), whilst at night 16°C (61°F) is normal.

San Marcos weather averages (imperial / metric)
Daytime temperature 27.6°C 81.6°F
Nightly temperature 16.3°C 61.3°F
Average temperature 21.9°C 71.4°F
Daily sunshine 9.6 hrs
Avg rainfall 8 mm 0.3 ins
Rainy days 1 days
Sea temperature 20.4°C 68.8°F
Humidity 69%
Windspeed 13.3kph 8 mph

On average September is the 4th driest month of the year in San Marcos with around 8mm 0.3 inches of rain making it a very dry time to visit.

On the flip side this corresponds to an average of 9.6 hours of sunshine per day.

September temperatures in San Marcos

San Marcos average temperature in September

September rainfall

San Marcos average rain in September

September hourly sunshine

San Marcos 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 San Marcos 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

San Marcos weather stats

San Marcos weather statistics
Hottest month: August 28.7°C 83.7°F
Driest month: July 1mm 0ins
Sunniest month: August 10.9hrs
Coldest month: January 17.7°C 63.9°F
Wettest month: January 73mm 2.9ins
Map showing location of San Marcos (33.14337, -117.16614) San Marcos map pin © Google

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