San Marcos Weather in May

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

The climate in San Marcos during May can be summarized as hot, humid and damp.

May is in the spring in San Marcos and is typically the 5th warmest month of the year. Daytime maximum temperatures average around a muggy 29°C (85°F), whilst at night 18°C (64°F) is normal.

San Marcos weather averages (imperial / metric)
Daytime temperature 29.4°C 84.9°F
Nightly temperature 18°C 64.4°F
Average temperature 23.7°C 74.7°F
Daily sunshine 7.7 hrs
Avg rainfall 119 mm 4.7 ins
Rainy days 9 days
Sea temperature 24.2°C 75.6°F
Humidity 71%
Windspeed 16.9kph 11 mph

On average May is the wettest month of the year in San Marcos with around 119mm 4.7 inches of rain making it a damp time to visit. This rainfall is typically spread over 9 days, although this may vary considerably.

On the flip side this corresponds to an average of 7.7 hours of sunshine per day.

May temperatures in San Marcos

San Marcos average temperature in May

May rainfall

San Marcos average rain in May

May hourly sunshine

San Marcos average rain in May

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 May 2025.

Other monthly averages

Best places to visit in May

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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