Weather in Houston

Houston is in United States at 29.8°N. The 2001–2020 NASA POWER daily record describes a humid subtropical climate. Rain is wet season runs from May to December, inside an annual total of 1247 mm. The wettest month is October at 128 mm; the driest is February at 70 mm.

August is the warmest month (average 29.6°C, high 35.0°C) and January is the coolest (average 10.6°C, low 5.0°C). From the coolest night in January (5.0°C) to the hottest afternoon in August (35.0°C), the raw range is 30.0°C. On this site the months that score closest to a 22°C day, lighter rain, and moderate humidity are April, May, and October.

How warm Houston gets

Monthly average highs run from 16.3°C in January to 35.0°C in August. Nights follow the same curve: 5.0°C in January and 24.1°C in August.

Across the year the mean afternoon high is 26.4°C. If you want the smallest day–night shock, look at months where the high and low sit close together; August nights still hold 24.1°C.

When Houston gets wet

The wet season in Houston starts in May and ends in December (May, June, July, August, September, October, November, and December). October is the core of it at 128 mm. February is the other extreme, with 70 mm.

Humidity peaks near 81%. That usually lines up with the wetter months rather than the hottest ones.

Distinctive months in Houston

The year bottoms out in January. Plan for 5.0°C at night and 16.3°C in the afternoon. February is the driest month, averaging only 70 mm across 8 rainy days. Highs sit near 18.6°C. March: 22.6°C high, 10.9°C low, 85 mm rain, 80% humidity. April stands apart from the months beside it: 26.5°C / 14.9°C and 87 mm. The wet season opens in May. Expect 119 mm and 11 rainy days, with nights around 19.4°C.

Peak heat arrives in August: 35.0°C by day, 24.1°C at night, and 72% humidity. September brings 118 mm and 13 rainy days; temperatures run from 21.5°C to 32.0°C. October is the wettest month — 128 mm and 10 rainy days, with 75% humidity. In November, Houston averages 22.1°C by day and 10.5°C at night, with 94 mm of rain. By December the wet season is ending. Houston still sees about 96 mm, but the next month is usually leaner.

When the score favours a visit

The three months with the highest comfort score are April, May, and October: April (20.7°C average, 87 mm, 77% humidity); May (25.0°C average, 119 mm, 74% humidity); October (21.9°C average, 128 mm, 75% humidity). They fall in calendar order. The score rewards averages near 22°C, lower rainfall, and humidity near 60%. It is a climate score, not a festival or price calendar.

If you want the wet season itself — fewer crowds, greener landscape, heavier rain — aim at May–December instead of the score.

Houston and other cities in United States

San Antonio is about 305 km away: Houston is about as warm as San Antonio at the hot peak and 467 mm wetter over the year than San Antonio. San Antonio’s wettest month is May (100 mm) versus October here.

Dallas is about 363 km away: Houston is 0.6°C cooler than Dallas in its hottest month and 325 mm wetter over the year than Dallas. Dallas’s wettest month is May (116 mm) versus October here.

Chicago is about 1512 km away: Houston is 7.0°C warmer than Chicago in its hottest month and 265 mm wetter over the year than Chicago. Chicago’s wettest month is May (117 mm) versus October here.