San Antonio weather in May
Temperature, rain and sunshine in May: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in May
Fair
Best time to visit: October – April
What is the weather like in San Antonio in May?
In May, San Antonio is hot: daytime highs average 30 °C, and even at night it stays warm at around 20 °C. Expect around 6 hours of sunshine a day. Rain is frequent, with about 10 rainy days and 88 mm in total. On about 16 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, May is a so-so month for a holiday in San Antonio.
May compared
How the weather changes from April to June. Tap a month to open it.
More details for May
- Daylight
- 13 h 36 min06:42 – 20:18
- UV index
- 11 · extremeclear sky, noon (estimate)All months
- Muggy days
- 22 daysdew point 18 °C or moreAll months
- Wind
- 20 km/haverage daily peakAll months
- Cloud cover
- 56 %on averageAll months
- Hot days
- 16 days30 °C or moreAll months
- Time zone
- UTC−5America/Chicago
How the score comes together
- Temperatureweight 50 %59 %
- Sunshineweight 20 %55 %
- Few rainy daysweight 30 %58 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in May
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Water bottle – drink plenty
- Insect repellent
- Rain jacket or umbrella
San Antonio in May: quick answers
Is San Antonio hot in May?
Yes. In May, San Antonio is hot: daytime highs average 30 °C and nights stay around 20 °C. On about 16 days the thermometer climbs to 30 °C or more.
Does it rain much in San Antonio in May?
Rain is frequent, with about 10 rainy days and 88 mm in total.
San Antonio month by month
The whole year in San AntonioAll destinations: USAWhere to go in May
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences