San Antonio Weather in April
During April, San Antonio, Texas enjoys mainly dry weather. It can get hot, but excessive heat is normally not encountered this time of year.
This page gives detailed information on the typical April temperature, precipitation, sun, humidity, wind and storms for San Antonio. The numbers here are historical averages based on climate data gathered at the San Antonio International Airport, located a few miles north of the city center.
Temperature
| 80 °F | April average high | 27 °C |
| 58 °F | April average low | 15 °C |
| 19 days | 80 °F max. or more (27 °C) |
| 16 days | 60 °F min. or less (16 °C) |
The temperature rises nearly every day during April to over 70 degrees Fahrenheit (21 degrees Celsius) in San Antonio. The city averages 3 days this month when the thermometer reaches into the 90s °F (over 32 °C). Temperatures in the 100s F (above 38 °C) can happen in some years here during April.
The thermometer dips to 40 °F (4 °C) or below on an average of 1 night. But April does not normally get as cold as freezing.
Rain
| 2.4 in | total precipitation | 61 mm |
| 6 days | of rain |
Half the time, San Antonio receives 0.9 to 3.6 inches (22 to 90 mm) of rainfall in April. One in four years has drier weather, while another one in four is wetter.
Sun
| 56 % | sunshine |
| 7 days | clear skies |
The sun's rays reach the ground in San Antonio during 56 percent of daylight hours on average in April, for a total of 217 hours in the month. Typically on 7 days this month the sky is mainly clear, with at most 30 percent cloud cover.
Sunlight in April at San Antonio lasts for 12 hours and 53 minutes a day on average. The shortest day of the month is the 1st with 12 hours and 29 minutes of daylight. By the end of the month, the days have lengthened to 13:17 from sunrise to sunset. These durations can vary by a minute or two from year to year.
Humidity
| 66 % | April average humidity |
The relative humidity in San Antonio during April usually peaks at 83 percent in the morning then drops to 49 percent by mid afternoon.
| Local Time | 12 am | 3 am | 6 am | 9 am | 12 pm | 3 pm | 6 pm | 9 pm |
| Humidity % | 75 | 80 | 83 | 72 | 57 | 49 | 50 | 65 |
Wind
| 10.1 mph | April wind speed average | 16.3 kph |
April is one of the windiest months in San Antonio.
Storms
| 2 days | rainfall of 0.5 inches (13 mm) or more |
| 4 days | with thunderstorms in April |
Reference
The weather data here are long-term averages provided by the US National Centers for Environmental Information (NCEI). Temperature and precipitation are 1991-2020 normals while humidity and thunderstorms are 1961-1990 normals.