Weather in Houston in May

Shoulder season. May sits in between. You will get good days and you will lose some. Highs average 30.9 °C, lows 19.6 °C, and rain falls on 11 days — nothing in the month is working against you.

May ranks 8 of 12 in Houston: past the worst of the year but short of March, which is the month to book if the dates are open.

Rain on 11 days, 3 of them heavy. Enough to need a plan B, not enough to need a plan around it. Pack for 30.9 °C days and 19.6 °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: 18 days top 30 °C — hot spells arrive, but they break. Across the twenty years measured, the hottest May day reached 38.8 °C and the coldest night fell to 6.5 °C, and the wettest single day dropped 75 mm — roughly 63% of the month's rain in one day.

May is moderately variable: 9 mm in the driest year against 327 mm in the wettest, around an average of 119 mm. Roughly two Mays in three land near that average, and the third does something else entirely.

Wind is light at 7.3 km/h, so the temperature on the page is close to the temperature on your skin, and humidity is unremarkable at 74%.

How May sits in the year

The month is on the way up: 4.2 °C warmer than April, and June adds another 3 °C. Late in the month feels noticeably different from the start of it, which is worth knowing if the trip is short.

Daylight in May

May is at or near the longest days of Houston's year: 13.6 hours of daylight, gaining 0.6 hours across the 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 — 30 °C between the warmest afternoons and the coldest nights, wider than any coastal city at this latitude would manage.

How busy it gets

Shoulder. The value months — prices ease off and you get the place closer to itself.

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

May in Houston versus nearby

If Houston 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, 3 days less rain. San Antonio is close enough to be a coin toss — within a degree on temperature, 1 day less rain.

So: May is a compromise. March is 22 points better and is what Houston 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 Houston

See all twelve months in Houston, or where else to go in May.