San Antonio Weather in May

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

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

May is in the spring in San Antonio and is typically the 5th warmest month of the year. Daytime maximum temperatures average around a muggy 30°C (86°F), whilst at night 19°C (66°F) is normal.

San Antonio weather averages (imperial / metric)
Daytime temperature 29.9°C 85.8°F
Nightly temperature 18.7°C 65.7°F
Average temperature 24.3°C 75.7°F
Daily sunshine 7.6 hrs
Avg rainfall 94 mm 3.7 ins
Rainy days 9 days
Sea temperature 24°C 75.2°F
Humidity 71%
Windspeed 17.3kph 11 mph

On average May is the wettest month of the year in San Antonio with around 94mm 3.7 inches of rain making it a a little 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 7.6 hours of sunshine per day.

May temperatures in San Antonio

San Antonio average temperature in May

May rainfall

San Antonio average rain in May

May hourly sunshine

San Antonio 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 Antonio 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 Antonio weather stats

San Antonio weather statistics
Hottest month: July 34.8°C 94.6°F
Driest month: March 37mm 1.5ins
Sunniest month: July 10.6hrs
Coldest month: January 15.8°C 60.4°F
Wettest month: May 94mm 3.7ins
Map showing location of San Antonio (29.42412, -98.49363) San Antonio map pin © Google

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