Weather in San Antonio in April

Prime time. April is about as good as San Antonio gets. Highs average 29.1 °C, lows 15.2 °C, and rain falls on 6 days — nothing in the month is working against you.

April ranks 6 of 12 in San Antonio: past the worst of the year but short of February, which is the month to book if the dates are open.

Rain falls on only 6 days, so an itinerary with no wet-weather fallback is a reasonable risk. Pack for 29.1 °C days and 15.2 °C nights; the spread matters more here than any single number.

What the averages hide

Averages flatten a month, and this one hides a few things: 13 days top 30 °C — hot spells arrive, but they break. Across the twenty years measured, the hottest April day reached 39.9 °C and the coldest night fell to 1.8 °C, and the wettest single day dropped 38 mm — roughly 61% of the month's rain in one day.

April is moderately variable: 1 mm in the driest year against 195 mm in the wettest, around an average of 62 mm. Roughly two Aprils in three land near that average, and the third does something else entirely.

Wind is light at 11.5 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 66%.

How April sits in the year

The month is on the way up: 4.4 °C warmer than March, and May adds another 3.2 °C. Late in the month feels noticeably different from the start of it, which is worth knowing if the trip is short.

Daylight in April

12.9 hours of daylight, gaining 0.8 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

Busy. Popular without being frantic; book the things you care about, improvise the rest.

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

April 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, the same number of rain days. Laredo is the weaker option in April — 4 °C warmer, the same number of rain days.

So: April works, with February the better month by 13 points if the dates can move. If they cannot, nothing here should stop you booking.

Every month in San Antonio

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