Climate averages 1991–2020
Houston weather
in May.
A hot, wet month: the 5th warmest and the 2nd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a hot month in Houston: daytime highs average 29.1°C and nights cool to about 20.3°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 90 mm of rain on roughly 10 days, which makes May a wet month (the 2nd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 38 min on an average May day.
The nearest other city in this atlas is Pasadena (Texas), United States (17 km away). In May its highs average 28.9°C, about as warm as Houston, with 90 mm of rain.
Among the 498 cities listed in the United States, Houston ranks joint 53rd of 498 for the warmest May highs and joint 293rd of 498 for the driest May (rainfall, lowest first). The mean May high of those 498 cities is 23.8°C; Houston is 5.3°C warmer than that mean.
From May to June, average highs rise by 2.6°C to 31.7°C, and monthly rainfall rises from 90 mm to 113 mm.
The annual picture
May in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Houston climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 16.7°C7.5°C | 7.5°C | 106 | 10.0 | 10.510 h |
| February | 18.7°C9.3°C | 9.3°C | 84 | 9.1 | 11.111 h |
| March | 21.9°C12.5°C | 12.5°C | 94 | 9.2 | 12.012 h |
| April | 25.4°C15.9°C | 15.9°C | 96 | 8.9 | 12.913 h |
| May, selected | 29.1°C20.3°C | 20.3°C | 90 | 9.8 | 13.614 h |
| June | 31.7°C23.5°C | 23.5°C | 113 | 12.7 | 14.014 h |
| July | 32.8°C24.4°C | 24.4°C | 91 | 12.7 | 13.914 h |
| August | 33.3°C24.5°C | 24.5°C | 98 | 13.2 | 13.213 h |
| September | 30.8°C22.1°C | 22.1°C | 118 | 11.8 | 12.412 h |
| October | 26.8°C17.4°C | 17.4°C | 105 | 8.7 | 11.511 h |
| November | 21.3°C12.1°C | 12.1°C | 103 | 8.3 | 10.711 h |
| December | 17.6°C8.6°C | 8.6°C | 105 | 9.6 | 10.310 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
May in nearby cities
- Pasadena (Texas), United States in MayUnited States · 17 kmHigh 28.9°C · Low 20.6°C · 90 mm rain
- Missouri City in MayUnited States · 23 kmHigh 29.2°C · Low 20.6°C · 85 mm rain
- Pearland in MayUnited States · 23 kmHigh 28.9°C · Low 20.7°C · 86 mm rain
- Sugar Land in MayUnited States · 31 kmHigh 29.3°C · Low 20.5°C · 87 mm rain
- Baytown in MayUnited States · 37 kmHigh 28.6°C · Low 20.7°C · 96 mm rain
- League City in MayUnited States · 38 kmHigh 28.1°C · Low 21.4°C · 89 mm rain
- Cypress in MayUnited States · 40 kmHigh 29.4°C · Low 20.1°C · 99 mm rain
- The Woodlands in MayUnited States · 46 kmHigh 29.4°C · Low 20.0°C · 104 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Houston) is explained once on the Houston year overview and on the Sources, method and limits page.
Pasadena (Texas), United States lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.