Houston is warmest in August, averaging 37° by day and 24° at night. The wettest month is May with 164 mm, and the year brings about 1048 mm in total.
Month by month
| Month | High | Low | Rain | Sea | Daylight | Good for |
|---|---|---|---|---|---|---|
| January | 18° | 5° | 115 mm | 13° | 10.3 h | Mild |
| February | 19° | 8° | 39 mm | 15° | 10.9 h | Sightseeing |
| March | 24° | 12° | 56 mm | 19° | 11.8 h | Sightseeing |
| April | 28° | 15° | 105 mm | 22° | 12.7 h | Mild |
| May | 31° | 19° | 164 mm | 26° | 13.5 h | Mild |
| June | 35° | 23° | 87 mm | 29° | 13.9 h | Beach weather |
| July | 36° | 24° | 115 mm | 30° | 13.7 h | Mild |
| August | 37° | 24° | 59 mm | 31° | 13.1 h | Very hot |
| September | 34° | 22° | 81 mm | 29° | 12.2 h | Beach weather |
| October | 30° | 16° | 59 mm | 26° | 11.3 h | Beach weather |
| November | 24° | 11° | 81 mm | 20° | 10.5 h | Sightseeing |
| December | 21° | 7° | 87 mm | 16° | 10.1 h | Sightseeing |
High and low are average daily maximum and minimum, rain is typical monthly total, sea is the average surface temperature, daylight is the hours between sunrise and sunset mid-month. Climate normals from NASA POWER and NOAA MUR — averages, not promises.
When to go
Beach weather: June, September and October — highs around 33°, nights no colder than 16°, and at most 87 mm of rain in a month. The sea sits at 26–29° then.
Walking the city: February, March, November and December — highs of 19–24° and no more than 87 mm of rain a month.
Serious heat: In August the average high reaches 37°.