San Antonio Weather in May
May in San Antonio brings very high temperatures around 31°C (88°F) during the day, dropping to 19°C (66°F) at night, with the most rainfall of the year.
Rainfall in San Antonio in May
As the rainiest month, carrying an umbrella is advisable to manage the frequent rain. You can expect rain on around 9 days based on historical patterns, with 130 mm (5.1 in) average for the month. When showers do arrive, they tend to be on the heavier side. Worth being prepared even if rain days are not that numerous.
Temperature in San Antonio in May
May in San Antonio sees highs of 31°C (88°F) and lows of 19°C (66°F) overnight. The hottest part of the day is usually in the afternoon, so lighter clothing can help you stay comfortable. With overnight lows of 19°C (66°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.
Sunshine in San Antonio in May
The city usually sees around 222 hours of sunlight, indicating many sunny days — a great month for sightseeing.If you prefer dry days with pleasant temperatures, February, March, April, October and November typically offer the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our San Antonio's climate page.
San Antonio Temperature in May
Min Temperature
19°C (66°F)
Max Temperature
31°C (88°F)
Chance of Rain
30%
Precipitation
130 mm (5.1 in)
Rainy days
9 days
Humidity
71%
Sunshine
222 hours
Percentage Sunshine
52%
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in San Antonio typically rise from around 29°C (84°F) at the start of May to approximately 32°C (90°F) by the end. Nights are pleasant, with lows typically ranging from 17°C (63°F) to 22°C (72°F).
Average temperatures in May
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in May
Historical weather for San Antonio in May
Browse day-by-day weather records for San Antonio spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
San Antonio historical weather extremes in May
According to our 49 years of weather records for San Antonio, the following extremes were recorded between 1976 and 2025.
- On May 13, 2025, temperatures climbed to 39°C (102°F), marking the warmest May day on record.
- San Antonio registered its coldest May night on May 4, 2013, with temperatures dropping to 6°C (43°F).
Best Places in the United States of America in May
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in May →
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What to Wear in San Antonio in May
Warm temperatures in May make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. Prepare for significant rainfall with proper waterproof clothing and shoes. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.What To Do in San Antonio in May
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our San Antonio's climate page.
Temperature Rainfall Sunshine Humidity
See the full San Antonio climate overview or explore weather in the United States of America.
