Climate averages 1991–2020
San Antonio weather
in March.
A warm, moderately wet month: the 8th warmest and the 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
March is a warm month in San Antonio: daytime highs average 22.8°C and nights cool to about 12.1°C. By daytime temperature it is the 8th warmest of the 12 months.
Expect about 79 mm of rain on roughly 9 days, which makes March a moderately wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 58 min on an average March day.
The nearest other city in this atlas is New Braunfels (47 km away). In March its highs average 22.2°C, 0.5°C cooler than San Antonio, with 75 mm of rain.
Among the 498 cities listed in the United States, San Antonio ranks 51st of 498 for the warmest March highs and joint 272nd of 498 for the driest March (rainfall, lowest first). The mean March high of those 498 cities is 14.9°C; San Antonio is 7.8°C warmer than that mean.
From March to April, average highs rise by 3.9°C to 26.6°C, and monthly rainfall falls from 79 mm to 78 mm.
The annual picture
March 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, selected | 22.8°C12.1°C | 12.1°C | 79 | 9.2 | 12.012 h |
| April | 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
March in nearby cities
- New Braunfels in MarchUnited States · 47 kmHigh 22.2°C · Low 11.8°C · 75 mm rain
- Austin in MarchUnited States · 118 kmHigh 21.8°C · Low 11.2°C · 74 mm rain
- Round Rock in MarchUnited States · 144 kmHigh 21.4°C · Low 11.0°C · 74 mm rain
- Killeen in MarchUnited States · 202 kmHigh 20.9°C · Low 10.3°C · 78 mm rain
- Corpus Christi in MarchUnited States · 210 kmHigh 23.4°C · Low 15.5°C · 59 mm rain
- Piedras Negras in MarchMexico · 213 kmHigh 25.7°C · Low 13.9°C · 43 mm rain
- Temple in MarchUnited States · 216 kmHigh 20.6°C · Low 10.4°C · 85 mm rain
- Ciudad Acuña in MarchMexico · 238 kmHigh 24.9°C · Low 13.0°C · 38 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.