San Antonio weather in April
April in San Antonio: warm, rainy, with clean air — an excellent time to visit.
#6 of 12 months in San Antonio · #268 of 604 destinations to visit in April · comfort 81/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
San Antonio climate normals — April
| Daytime high | 28°C / 82°F | 🌤 warm |
|---|---|---|
| Nighttime low | 16°C / 61°F | |
| Feels like (high) | 28°C / 82°F | |
| Rainfall | 92 mm / 3.6 in | 🌧 rainy |
| Rainy days | 11 days | |
| Humidity | 66% | 💧 humid |
| Dew point | 14°C / 57°F | |
| Sunshine | 8.5 h/day | |
| Daylight | 12.9 h | |
| Wind | 20 km/h / 12 mph | |
| Air quality (US AQI) | 40 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is San Antonio?
Loading map…
San Antonio in April — FAQ
- Is April a good time to visit San Antonio?
- April in San Antonio: warm, rainy, with clean air — an excellent time to visit. It ranks #6 of 12 months for San Antonio on SeasonMap's comfort score (81/100).
- What is the weather like in San Antonio in April?
- In April, San Antonio averages a daily high of 27.6°C and a low of 16.3°C, with about 91.6 mm of rain over roughly 11.2 rainy days.
- What is the air quality in San Antonio in April?
- San Antonio has a mean US Air Quality Index of about 40 in April.