San Antonio weather

Our guide to the weather in San Antonio during May

25

Average high

6

UV Index

38mm

Monthly rainfall

51%

Humidity

We've looked at the most up-to-date weather data for San Antonio, covering the last 12 years up to 2024, plus we've asked our team of travel bloggers for their first-hand experiences in order to answer the most frequently asked questions about San Antonio weather in May.

How warm is it in San Antonio during May?

The temperature reaches around 25℃ during the daytime in May, falling away to 13℃ at night. The UV index will be high at this time of year, so protection against skin and eye damage is needed. Try to limit exposure between 10am and 4pm. Apply broad spectrum SPF 30+ sunscreen every few hours, even if it's cloudy, or more frequently after sweating or swimming, and wear UV-blocking sunglasses too, and bear in mind that bright surfaces, such as sand and water increase UV exposure.

Does it rain in San Antonio during May?

On average, there will be 3 rainy days during the month, amounting to 37.9mm in total. That's much drier than we see in England during August, and therefore not something to be concerned about. There's a small chance that you'll catch a thunderstorm during your trip.

Is it windy in San Antonio during May?

You're unlikely to experience any strong winds. Expect a light breeze that picks up slightly at times in May. With moderate humidity and mild air temperatures, the breeze will have a slight cooling effect.

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Weather in San Antonio

Our month-by-month guide to the weather and climate in San Antonio

12.0

San Antonio weather in

January
13.6

San Antonio weather in

February
16.2

San Antonio weather in

March
19.6

San Antonio weather in

April
25.3

San Antonio weather in

May
30.7

San Antonio weather in

June
35.4

San Antonio weather in

July
35.2

San Antonio weather in

August
29.4

San Antonio weather in

September
24.4

San Antonio weather in

October
16.3

San Antonio weather in

November
13.8

San Antonio weather in

December