San Antonio weather in May
May in San Antonio: hot, rainy — a good time to visit.
#9 of 12 months in San Antonio · #473 of 604 destinations to visit in May · comfort 69/100 (tier C)
Updated June 2026 · climate normals from ERA5 reanalysis
San Antonio climate normals — May
| Daytime high | 30°C / 87°F | 🥵 hot |
|---|---|---|
| Nighttime low | 21°C / 69°F | |
| Feels like (high) | 33°C / 91°F | |
| Rainfall | 122 mm / 4.8 in | 🌧 rainy |
| Rainy days | 14 days | |
| Humidity | 72% | 💧 humid |
| Dew point | 19°C / 67°F | |
| Sunshine | 10.3 h/day | |
| Daylight | 13.6 h | |
| Wind | 19 km/h / 12 mph | |
| Air quality (US AQI) | 52 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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San Antonio in May — FAQ
- Is May a good time to visit San Antonio?
- May in San Antonio: hot, rainy — a good time to visit. It ranks #9 of 12 months for San Antonio on SeasonMap's comfort score (69/100).
- What is the weather like in San Antonio in May?
- In May, San Antonio averages a daily high of 30.4°C and a low of 20.5°C, with about 122.3 mm of rain over roughly 14.2 rainy days.
- What is the air quality in San Antonio in May?
- San Antonio has a mean US Air Quality Index of about 52 in May.