San Marcos Weather in October

What's the weather like in San Marcos (Texas) in October 2025?

The climate in San Marcos during October can be summarized as warm and a little damp.

October is in the fall / autumn in San Marcos and is typically the 6th warmest month of the year. Daytime maximum temperatures average around a comfortable 28°C (82°F), whilst at night 14°C (57°F) is normal.

San Marcos weather averages (imperial / metric)
Daytime temperature 27.6°C 81.6°F
Nightly temperature 13.9°C 56.9°F
Average temperature 20.7°C 69.3°F
Daily sunshine 7.5 hrs
Avg rainfall 89 mm 3.5 ins
Rainy days 7 days
Sea temperature 26.1°C 79°F
Humidity 68%
Windspeed 14.4kph 9 mph

On average October is the 4th wettest month of the year in San Marcos with around 89mm 3.5 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 7 days, although this may vary considerably.

On the flip side this corresponds to an average of 7.5 hours of sunshine per day.

October temperatures in San Marcos

San Marcos average temperature in October

October rainfall

San Marcos average rain in October

October hourly sunshine

San Marcos average rain in October

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 October 2025.

Other monthly averages

Best places to visit in October

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

San Marcos weather stats

San Marcos weather statistics
Hottest month: July 34.7°C 94.5°F
Driest month: July 42mm 1.7ins
Sunniest month: July 10.8hrs
Coldest month: January 14.9°C 58.8°F
Wettest month: May 119mm 4.7ins
Map showing location of San Marcos (29.88327, -97.94139) San Marcos map pin © Google

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