Climate averages 1991–2020
San Antonio weather
in April.
A warm, moderately wet month: the 7th warmest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
April is a warm month in San Antonio: daytime highs average 26.6°C and nights cool to about 15.7°C. By daytime temperature it is the 7th warmest of the 12 months.
Expect about 78 mm of rain on roughly 9 days, which makes April a moderately wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 52 min on an average April day.
The nearest other city in this atlas is New Braunfels (47 km away). In April its highs average 26.1°C, 0.5°C cooler than San Antonio, with 79 mm of rain.
Among the 498 cities listed in the United States, San Antonio ranks joint 42nd of 498 for the warmest April highs and joint 218th of 498 for the driest April (rainfall, lowest first). The mean April high of those 498 cities is 19.4°C; San Antonio is 7.3°C warmer than that mean.
From April to May, average highs rise by 3.2°C to 29.9°C, and monthly rainfall rises from 78 mm to 103 mm.
The annual picture
April in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
San Antonio climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 16.9°C6.7°C | 6.7°C | 57 | 7.2 | 10.510 h |
| February | 19.3°C8.7°C | 8.7°C | 59 | 7.5 | 11.111 h |
| March | 22.8°C12.1°C | 12.1°C | 79 | 9.2 | 12.012 h |
| April, selected | 26.6°C15.7°C | 15.7°C | 78 | 8.5 | 12.913 h |
| May | 29.9°C19.9°C | 19.9°C | 103 | 11.2 | 13.614 h |
| June | 33.0°C23.1°C | 23.1°C | 69 | 9.5 | 14.014 h |
| July | 34.5°C24.1°C | 24.1°C | 50 | 6.1 | 13.814 h |
| August | 35.1°C24.7°C | 24.7°C | 50 | 5.8 | 13.213 h |
| September | 31.6°C22.0°C | 22.0°C | 77 | 8.6 | 12.412 h |
| October | 27.3°C17.3°C | 17.3°C | 83 | 7.7 | 11.511 h |
| November | 21.5°C11.7°C | 11.7°C | 67 | 7.2 | 10.711 h |
| December | 17.5°C7.8°C | 7.8°C | 63 | 7.5 | 10.310 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
April in nearby cities
- New Braunfels in AprilUnited States · 47 kmHigh 26.1°C · Low 15.4°C · 79 mm rain
- Austin in AprilUnited States · 118 kmHigh 25.8°C · Low 15.0°C · 83 mm rain
- Round Rock in AprilUnited States · 144 kmHigh 25.5°C · Low 14.9°C · 76 mm rain
- Killeen in AprilUnited States · 202 kmHigh 25.0°C · Low 14.3°C · 75 mm rain
- Corpus Christi in AprilUnited States · 210 kmHigh 26.5°C · Low 18.8°C · 52 mm rain
- Piedras Negras in AprilMexico · 213 kmHigh 29.9°C · Low 17.8°C · 48 mm rain
- Temple in AprilUnited States · 216 kmHigh 24.7°C · Low 14.3°C · 83 mm rain
- Ciudad Acuña in AprilMexico · 238 kmHigh 29.1°C · Low 17.0°C · 42 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for San Antonio) is explained once on the San Antonio year overview and on the Sources, method and limits page.