San Antonio weather in March
In March, San Antonio has an average high of 24 °C76 °F and an average low of 11 °C51 °F, with about 62 mm2.4 in of precipitation. It is the 8th warmest month of the year and ranks 8th for precipitation.
How March compares with other months
Compared with February, March is 4.3 °C7.8 °F warmer on average and wetter by 26 mm1.0 in. Compared with April, March is 4.3 °C7.7 °F cooler on average. Daylight lasts about 11.9 hours around the middle of the month. Average relative humidity is 70% and the average cloud amount 61%.
Is March a good time to visit San Antonio?
Yes — March 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 March
For San Antonio in March, pack light summer clothes such as T-shirts, shorts or light dresses and an extra layer for the cooler mornings and evenings.
March in nearby places
| Place | High °C°F | Low °C°F | Precip. mmin |
|---|---|---|---|
| San Antonio | 2476 | 1151 | 622.4 |
| Austin | 2373 | 1049 | 732.9 |
| Killeen | 2271 | 947 | 753.0 |
| Corpus Christi | 2577 | 1457 | 501.9 |
| Piedras Negras | 2882 | 1254 | 281.1 |
| Ciudad Acuña | 2781 | 1253 | 271.1 |
| Nuevo Laredo | 2883 | 1356 | 371.5 |
| College Station | 2271 | 1049 | 873.4 |
| Waco | 2170 | 948 | 903.5 |
Nearby places that are more than 1 °C1.8 °F warmer in March: 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 March?
In March the average high in San Antonio is 24 °C (76 °F) and the average low is 11 °C (51 °F).
Does it rain a lot in San Antonio in March?
On average about 62 mm (2.4 in) of precipitation falls in March; it ranks 8th of the 12 months.
Is March 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 March?
In the middle of March the day in San Antonio lasts about 11.9 hours from sunrise to sunset. The value is calculated from the position of the city and the sun.
How humid is San Antonio in March?
The average relative humidity in March is about 70%. This is a long-term average for the whole day.
How cloudy is San Antonio in March?
On average about 61% of the sky is covered by cloud in March. 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.