March is one of the cooler months of the year in San Antonio, with average highs near 24.1°C and lows around 10.1°C (mean 17.1°C). It is about average for rainfall, averaging 56 mm of rainfall and 68% relative humidity across the period.
March is one of the cooler months of the year in San Antonio. Across 45 years of records, the warmest March in San Antonio was 2025 — when the month averaged 21°C — while the coldest was 2001 at 13.3°C. Typical March days reach 24.1°C with nights near 10.1°C. The long-term trend is warming, about 0.7°C per decade.
March is about average for rainfall in San Antonio, averaging 56 mm of rainfall. The wettest March on record was 2007 with 190 mm, while the driest was 2011 at 2 mm.
Relative humidity in San Antonio during March averages 68%. The most humid March was 1992 at 79%, and the least humid was 2022 at 52%.
March receives about 4.6 kWh/m²/day of solar energy in San Antonio. The sunniest Marchs were 2022 and 2025 at 5.6 kWh/m²/day, and the cloudiest was 1990 at 3.6.
Average wind speed in San Antonio during March is 3.1 m/s. The windiest March was 2008 at 3.7 m/s, while the calmest was 2015 at 2.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 16.4°C | 16.1°C | 17.1°C | 17.3°C | 19.3°C | +2.9°C |
| Avg High | 23.6°C | 22.9°C | 23.8°C | 24.2°C | 26.8°C | +3.2°C |
| Avg Low | 9.1°C | 9.3°C | 10.4°C | 10.4°C | 11.7°C | +2.6°C |
| Avg Rain | 45 mm | 68 mm | 66 mm | 56 mm | 33 mm | -12 mm |
March temperatures in San Antonio have risen by about 2.2°C between 1981–1985 and 2021–2025.
March has ranged from a record low of -5.4°C (2002) to a record high of 35.1°C (2013).
Rainfall in March is about average for rainfall, averaging 56 mm, with a wettest year of 190 mm.
One of the best times to visit San Antonio
March is one of the best times to visit San Antonio. Expect days averaging 24.1°C and nights around 10.1°C (mean 17.1°C) — cooler than San Antonio's yearly average — with moderate rainfall (56 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 🔥 | 29.3°C | 21.0°C | 12.7°C | 34.6°C | 5.6°C | 33 mm | 53% | 3.1 m/s | 5.6 |
| 2024 | 26.2°C | 19.2°C | 12.1°C | 32.7°C | 3.9°C | 39 mm | 69% | 2.9 m/s | 4.4 |
| 2023 | 27.1°C | 19.8°C | 12.5°C | 34.5°C | 3.3°C | 33 mm | 63% | 3.2 m/s | 4.2 |
| 2022 | 25.7°C | 17.1°C | 8.5°C | 33.0°C | -3.1°C | 15 mm | 52% | 3.3 m/s | 5.6 |
| 2021 | 25.3°C | 17.7°C | 10.2°C | 31.0°C | 4.1°C | 18 mm | 62% | 3.4 m/s | 5 |
| 2020 | 27.1°C | 20.8°C | 14.4°C | 33.7°C | 7.2°C | 60 mm | 71% | 2.9 m/s | 3.7 |
| 2019 | 22.5°C | 16.2°C | 9.8°C | 30.4°C | -3.9°C | 8 mm | 67% | 3.1 m/s | 4.2 |
| 2018 | 26.1°C | 19.2°C | 12.3°C | 32.6°C | 5.8°C | 75 mm | 64% | 3 m/s | 4.8 |
| 2017 | 25.0°C | 19.0°C | 13.0°C | 31.0°C | 5.3°C | 79 mm | 74% | 3.1 m/s | 4.6 |
| 2016 | 25.2°C | 18.3°C | 11.3°C | 31.6°C | 2.4°C | 83 mm | 71% | 3 m/s | 4.9 |
| 2015 | 21.9°C | 15.7°C | 9.5°C | 27.3°C | -3.1°C | 105 mm | 78% | 2.4 m/s | 4.1 |
| 2014 | 23.0°C | 15.4°C | 7.8°C | 33.1°C | -3.9°C | 45 mm | 66% | 3.1 m/s | 4.5 |
| 2013 | 25.6°C | 17.2°C | 8.9°C | 35.1°C | 2.2°C | 16 mm | 56% | 3.2 m/s | 5.4 |
| 2012 | 24.4°C | 18.3°C | 12.3°C | 31.6°C | 4.4°C | 97 mm | 77% | 3.1 m/s | 4.5 |
| 2011 | 27.7°C | 19.8°C | 11.9°C | 34.7°C | 1.5°C | 2 mm | 61% | 3.2 m/s | 4.9 |
| 2010 | 20.9°C | 13.9°C | 6.9°C | 27.4°C | -1.4°C | 48 mm | 72% | 3.1 m/s | 5.4 |
| 2009 | 24.8°C | 17.7°C | 10.5°C | 29.8°C | 0.6°C | 52 mm | 65% | 3.4 m/s | 4.7 |
| 2008 | 25.3°C | 17.4°C | 9.5°C | 33.4°C | -1.0°C | 49 mm | 64% | 3.7 m/s | 4.7 |
| 2007 🌧️ | 23.3°C | 17.9°C | 12.5°C | 26.7°C | 0.0°C | 190 mm | 77% | 3.2 m/s | 4 |
| 2006 | 26.5°C | 19.7°C | 12.8°C | 33.4°C | 0.0°C | 40 mm | 62% | 3.3 m/s | 4.4 |
| 2005 | 22.3°C | 15.6°C | 8.8°C | 27.6°C | 1.8°C | 71 mm | 74% | 2.7 m/s | 5.1 |
| 2004 | 24.8°C | 18.8°C | 12.8°C | 28.5°C | 6.6°C | 68 mm | 72% | 3.1 m/s | 3.7 |
| 2003 | 21.6°C | 15.3°C | 9.1°C | 27.8°C | 1.1°C | 32 mm | 76% | 2.6 m/s | 4.5 |
| 2002 | 23.7°C | 15.9°C | 8.2°C | 30.9°C | -5.4°C | 31 mm | 65% | 3.4 m/s | 4.6 |
| 2001 ❄️ | 19.3°C | 13.3°C | 7.2°C | 25.8°C | 2.1°C | 80 mm | 77% | 2.6 m/s | 4 |
| 2000 | 26.6°C | 19.7°C | 12.8°C | 33.2°C | 3.6°C | 49 mm | 68% | 3.3 m/s | 4.4 |
| 1999 | 24.9°C | 17.7°C | 10.6°C | 31.0°C | 2.3°C | 93 mm | 68% | 3.3 m/s | 4.4 |
| 1998 | 21.5°C | 14.7°C | 7.8°C | 29.8°C | -1.5°C | 72 mm | 71% | 3.4 m/s | 4.8 |
| 1997 | 23.3°C | 16.9°C | 10.5°C | 31.6°C | 3.5°C | 74 mm | 74% | 2.9 m/s | 4.3 |
| 1996 | 22.4°C | 14.4°C | 6.4°C | 30.9°C | -3.2°C | 17 mm | 56% | 3.3 m/s | 4.9 |
| 1995 | 22.2°C | 15.9°C | 9.5°C | 32.2°C | -2.8°C | 64 mm | 72% | 3 m/s | 4 |
| 1994 | 23.7°C | 16.7°C | 9.7°C | 30.5°C | -0.2°C | 85 mm | 70% | 2.9 m/s | 4.7 |
| 1993 | 22.1°C | 15.3°C | 8.6°C | 28.0°C | -2.9°C | 63 mm | 73% | 2.9 m/s | 4.4 |
| 1992 | 21.4°C | 15.6°C | 9.9°C | 25.5°C | 1.9°C | 112 mm | 79% | 2.7 m/s | 4.6 |
| 1991 | 24.1°C | 16.9°C | 9.7°C | 31.5°C | 4.7°C | 25 mm | 62% | 3.1 m/s | 4.8 |
| 1990 | 23.2°C | 17.0°C | 10.7°C | 29.1°C | 0.9°C | 75 mm | 73% | 3.4 m/s | 3.6 |
| 1989 | 24.0°C | 16.0°C | 8.0°C | 33.1°C | -4.3°C | 51 mm | 66% | 3 m/s | 5 |
| 1988 | 24.4°C | 16.3°C | 8.2°C | 31.8°C | -0.9°C | 37 mm | 59% | 3.4 m/s | 4.7 |
| 1987 | 20.1°C | 13.5°C | 6.8°C | 25.3°C | -1.7°C | 28 mm | 71% | 2.7 m/s | 4.9 |
| 1986 | 25.0°C | 17.2°C | 9.4°C | 29.1°C | 1.4°C | 18 mm | 61% | 2.8 m/s | 5.4 |
| 1985 | 23.3°C | 17.3°C | 11.2°C | 31.0°C | 4.2°C | 63 mm | 76% | 3.2 m/s | 4.1 |
| 1984 | 25.6°C | 17.6°C | 9.7°C | 34.7°C | 0.1°C | 31 mm | 62% | 3.4 m/s | 5.1 |
| 1983 | 22.1°C | 15.0°C | 7.9°C | 28.8°C | 0.1°C | 104 mm | 69% | 3.2 m/s | — |
| 1982 | 25.5°C | 18.6°C | 11.7°C | 33.0°C | -0.8°C | 18 mm | 73% | 3.2 m/s | — |
| 1981 | 22.6°C | 15.7°C | 8.9°C | 30.8°C | 1.7°C | 56 mm | 67% | 3.1 m/s | — |
Actual recorded March data for each year, 1981–2025 — sourced from NASA POWER.
The average high in March is around 24.1°C with lows near 10.1°C (mean 17.1°C), based on 45 years of NASA POWER data.
March averages 56 mm of rainfall in San Antonio, about average for rainfall. The wettest on record was 190 mm in 2007.
The hottest March reached 35.1°C in 2013. The coldest dipped to -5.4°C in 2002.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average March temperatures have risen by about 2.2°C. Daytime highs moved from 23.8°C to 26.7°C and overnight lows from 9.9°C to 11.2°C over the same span.
March is one of the cooler months of the year in San Antonio and about average for rainfall, so plan for around 24.1°C daytime highs and 10.1°C at night.
Not quite — March is the 5th coolest month in San Antonio, averaging 17.1°C.
For March in San Antonio, pack light layers you can adjust through the day, with typical highs of 24.1°C and lows of 10.1°C. Bring an umbrella or light rain jacket too.
Relative humidity in March averages 68% — moderately humid.
Average wind speed in March is 3.1 m/s. The windiest March on record averaged 3.7 m/s (2008).
The wettest March on record was 2007 with 190 mm. On average, March sees 56 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in San Antonio behaves each March, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for March specifically, along with year-by-year records and how the month has changed over the decades.
