Weather in San Antonio in March

Prime time. If you get to pick your dates, March is the one. Highs average 24.7 °C, lows 11.2 °C, and rain falls on 7 days — nothing in the month is working against you.

March ranks 3 of 12 in San Antonio. Only February scores clearly higher, and the difference is small enough to be settled by price rather than weather.

Rain on 7 days, 2 of them heavy. Enough to need a plan B, not enough to need a plan around it. Nothing specialised needed — this is the month you pack for the trip rather than for the weather.

What the averages hide

Averages flatten a month, and this one hides a few things: 4 days top 30 °C — hot spells arrive, but they break. Across the twenty years measured, the hottest March day reached 35.8 °C and the coldest night fell to -4.8 °C, and the wettest single day dropped 53 mm — roughly 85% of the month's rain in one day.

March is moderately variable: 2 mm in the driest year against 190 mm in the wettest, around an average of 62 mm. Roughly two Marchs in three land near that average, and the third does something else entirely.

Wind is light at 11 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 70%.

How March sits in the year

The month is on the way up: 4.3 °C warmer than February, and April adds another 4.4 °C. Late in the month feels noticeably different from the start of it, which is worth knowing if the trip is short.

Daylight in March

11.9 hours of daylight, gaining 0.9 hours across the month. That is between San Antonio's extremes of 14 and 10.3 hours, so days are long enough not to constrain the plan.

An inland climate

With no coast nearby, the year swings a fair way — 31.5 °C between the warmest afternoons and the coldest nights, wider than any coastal city at this latitude would manage.

How busy it gets

Peak season. Expect the highest prices of the year and to be booking well ahead.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

March in San Antonio versus nearby

If San Antonio is one option among several, the nearby comparison is worth making. Corpus Christi is close enough to be a coin toss — within a degree on temperature, 1 day less rain. Laredo is close enough to be a coin toss — 4.1 °C warmer, 2 days less rain.

So: March is effectively as good as it gets here — 5 points behind February, which is inside the margin where the weather stops being the deciding factor and price starts being it.

Every month in San Antonio

See all twelve months in San Antonio, or where else to go in March.