Climate averages 1991–2020
Houston weather
by month.
See how the year changes. August has the highest average daily maximum; February has the lowest average monthly rainfall.
Long-term climate patterns, not a forecast for a particular trip.
Across the year Houston averages a daytime high of 25.5°C and a nighttime low of 16.5°C, with about 1,203 mm of rain on roughly 124 days. August is the warmest month (average high 33.3°C) and January the coolest (16.7°C). September is the wettest month with 118 mm; February is the driest with 84 mm.
The annual picture
A year in Houston
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 | 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
Nearby cities
- Pasadena (Texas), United StatesUnited States · 17 kmHigh 25.4°C · Low 16.8°C · 1,203 mm rain a year
- Missouri CityUnited States · 23 kmHigh 25.6°C · Low 16.8°C · 1,145 mm rain a year
- PearlandUnited States · 23 kmHigh 25.5°C · Low 16.9°C · 1,188 mm rain a year
- Sugar LandUnited States · 31 kmHigh 25.7°C · Low 16.8°C · 1,096 mm rain a year
- BaytownUnited States · 37 kmHigh 25.1°C · Low 16.8°C · 1,278 mm rain a year
- League CityUnited States · 38 kmHigh 24.9°C · Low 17.6°C · 1,219 mm rain a year
- CypressUnited States · 40 kmHigh 25.6°C · Low 16.3°C · 1,114 mm rain a year
- The WoodlandsUnited States · 46 kmHigh 25.5°C · Low 16.1°C · 1,178 mm rain a year
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 limitsWhat do the high and low temperatures mean?
We average the daily maximum and daily minimum for each calendar month over 1991–2020. They are not record extremes, a forecast range or temperatures at a fixed time of day.
How is a rain day counted?
A local calendar day (standard time, UTC-6, no daylight saving) with at least 1 mm of total precipitation counts as one rain day. We count these for each year and month, then average across 30 years. The average does not predict which days will be wet.
Where do the numbers come from?
ERA5-Land (temperature) and ERA5 (precipitation) reanalysis from the Copernicus Climate Change Service, read from the Open-Meteo open-data archive. Temperature comes from the 0.1° model cell at 29.80°, -95.40° (5 km from the city centre), adjusted down by 0.1°C for the difference between the city's elevation (30 m) and the cell's (22 m). Rain comes from the 0.25° cell at 29.75°, -95.25°. 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. These are model estimates, not weather-station readings; coast, hills and city streets can differ.
Does this page show sunshine, humidity or sea temperature?
No. The data used here contain air temperature and precipitation only. Daylight hours are calculated from the city's latitude (sunrise to sunset), not measured sunshine.