San Antonio Weather in March
San Antonio, Texas enjoys some warm weather during March, along with spring breezes and low humidity.
This page gives detailed information on the typical March 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
| 74 °F | March average high | 23 °C |
| 52 °F | March average low | 11 °C |
| 23 days | 70 °F max. or more (21 °C) |
| 14 days | 50 °F min. or less (10 °C) |
The temperature rises nearly every day in March to over 60 degrees Fahrenheit (16 degrees Celsius) in San Antonio. The city averages ten days this month when the thermometer reaches into the 80s °F (over 27 °C). In some years, March can get as hot as 90 °F (32 °C).
The thermometer typically dips to 40 °F (4 °C) or below on 4 nights. Typically one of those nights has frost.
Rain
| 2.3 in | total precipitation | 59 mm |
| 9 days | of rain |
Half the time, San Antonio receives 1.1 to 2.9 inches (28 to 75 mm) of rainfall in March. One in four years has drier weather, while another one in four is wetter.
Sun
| 57 % | sunshine |
| 9 days | clear skies |
The sun's rays reach the ground in San Antonio during 57 percent of daylight hours on average in March, for a total of 212 hours in the month. Typically on 9 days this month the sky is mainly clear, with at most 30 percent cloud cover.
Sunlight in March at San Antonio lasts for 12 hours a day on average. The shortest day of the month is the 1st with 11 hours and 34 minutes of daylight. By the end of the month, the days have lengthened to 12:28 from sunrise to sunset. These durations can vary by a minute or two from year to year.
Humidity
| 63 % | March average humidity |
The relative humidity in San Antonio during March usually peaks at 79 percent in the morning then drops to 46 percent by mid afternoon.
| Local Time | 12 am | 3 am | 6 am | 9 am | 12 pm | 3 pm | 6 pm | 9 pm |
| Humidity % | 72 | 77 | 79 | 70 | 54 | 46 | 47 | 61 |
Wind
| 10.1 mph | March wind speed average | 16.3 kph |
March is one of the windiest months in San Antonio.
Storms
| 1 day | rainfall of 0.5 inches (13 mm) or more |
| 2 days | with thunderstorms in March |
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.