Weather in San Antonio in June

A hard month. June is a hard month in San Antonio, and worth planning around. Daytime highs average 35.2 °C and the afternoon is not negotiable — outdoor plans move to early morning or evening.

June ranks 10 of 12 — near the bottom of San Antonio's year. February is the month that works, and the swing between the two is 48 points, which is a different holiday rather than a slightly better one.

Rain on 10 days, 2 of them heavy. Enough to need a plan B, not enough to need a plan around it. Pack for heat management rather than style: shade, water, and a schedule that gives up on the middle of the day.

What the averages hide

Averages flatten a month, and this one hides a few things: 17 days clear 35 °C, so a serious heatwave is normal rather than notable. Across the twenty years measured, the hottest June day reached 43.6 °C and the coldest night fell to 16.6 °C, and the wettest single day dropped 48 mm — roughly 68% of the month's rain in one day.

This is the volatile part. June rainfall has ranged from 5 mm to 244 mm across the twenty years measured — a 239 mm spread around an average of 71 mm. The average is real but almost no individual June looks like it, so treat the figure as the middle of a wide range rather than a forecast.

Wind is light at 10.6 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 65%.

How June sits in the year

Temperatures hold steady either side: 32.3 °C in May, 35.2 here, 35.9 in July. Nothing about the timing within the month matters much.

Daylight in June

June is at or near the longest days of San Antonio's year: 14 hours of daylight, holding steady all month. Evenings are the real gain — dinner outdoors still happens in full light.

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

Off season. The genuine off season: cheapest by a distance, with the caveat that some tours and restaurants close entirely.

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

June 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 the weaker option in June — 2.5 °C warmer, 3 days less rain.

So: June is a compromise. February is 47 points better and is what San Antonio is actually like at its best — worth moving the trip for if that is possible, and worth adjusting expectations for if it is not.

Every month in San Antonio

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