San Antonio weather in April
In April, San Antonio has an average high of 29 °C84 °F and an average low of 15 °C59 °F, with about 62 mm2.5 in of precipitation. It is the 7th warmest month of the year and ranks 6th for precipitation.
How April compares with other months
Compared with March, April is 4.3 °C7.7 °F warmer on average. Compared with May, April is 3.8 °C6.9 °F cooler on average and drier by 37 mm1.5 in. Daylight lasts about 12.8 hours around the middle of the month. Average relative humidity is 66% and the average cloud amount 60%.
Is April a good time to visit San Antonio?
Yes — April is one of the most comfortable months to visit San Antonio by our comfort score, which favours average highs of 21–28 °C, lows above 5 °C, little rain and moderate humidity.
What to wear in April
For San Antonio in April, pack light summer clothes such as T-shirts, shorts or light dresses and an extra layer for the cooler mornings and evenings.
April in nearby places
| Place | High °C°F | Low °C°F | Precip. mmin |
|---|---|---|---|
| San Antonio | 2984 | 1559 | 622.5 |
| Austin | 2781 | 1457 | 632.5 |
| Killeen | 2679 | 1355 | 652.6 |
| Corpus Christi | 2984 | 1864 | 471.8 |
| Piedras Negras | 3290 | 1762 | 351.4 |
| Ciudad Acuña | 3289 | 1661 | 271.1 |
| Nuevo Laredo | 3290 | 1864 | 391.5 |
| College Station | 2679 | 1457 | 803.2 |
| Waco | 2578 | 1355 | 823.2 |
Nearby places that are more than 1 °C1.8 °F warmer in April: Corpus Christi, Piedras Negras, Ciudad Acuña and Nuevo Laredo; cooler: Austin, Killeen, College Station and Waco.
Other months in San Antonio
- January17 °C63 °F / 5 °C40 °F
- February20 °C68 °F / 6 °C44 °F
- March24 °C76 °F / 11 °C51 °F
- April29 °C84 °F / 15 °C59 °F
- May32 °C89 °F / 19 °C67 °F
- June35 °C95 °F / 23 °C73 °F
- July36 °C96 °F / 24 °C75 °F
- August36 °C97 °F / 24 °C76 °F
- September32 °C90 °F / 21 °C70 °F
- October28 °C83 °F / 16 °C60 °F
- November23 °C73 °F / 10 °C50 °F
- December18 °C64 °F / 5 °C42 °F
Frequently asked questions
How warm is San Antonio in April?
In April the average high in San Antonio is 29 °C (84 °F) and the average low is 15 °C (59 °F).
Does it rain a lot in San Antonio in April?
On average about 62 mm (2.5 in) of precipitation falls in April; it ranks 6th of the 12 months.
Is April the warmest month in San Antonio?
No. The warmest month in San Antonio is August, with an average high of 36 °C (97 °F). The coldest month is January, with an average low of 5 °C (40 °F).
How long is the day in San Antonio in April?
In the middle of April the day in San Antonio lasts about 12.8 hours from sunrise to sunset. The value is calculated from the position of the city and the sun.
How humid is San Antonio in April?
The average relative humidity in April is about 66%. This is a long-term average for the whole day.
How cloudy is San Antonio in April?
On average about 60% of the sky is covered by cloud in April. This is the mean cloud amount from satellite data, not the number of sunny days.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.
The grid cell’s average elevation is 302 m, while San Antonio lies at about 198 m. Temperatures on this page were therefore adjusted by +0.7 °C1.2 °F using the standard lapse rate of 6.5 °C per 1,000 m.