Houston Weather in May
Hot weather begins to appear at Houston, Texas in May. There's more sun now than earlier in the year, but there's also more rain.
This page gives detailed information on the typical May temperature, precipitation, sun, humidity, wind and storms for Houston. The numbers here are historical averages based on temperature and rainfall measurements gathered at Houston Hobby Airport and other climate data from George Bush Intercontinental Airport.
Temperature
| 86 °F | May average high | 30 °C |
| 69 °F | May average low | 21 °C |
| 7 days | 90 °F max. or more (32 °C) |
| 17 days | 70 °F min. or less (21 °C) |
The temperature rises most days in May to over 80 degrees Fahrenheit (27 degrees Celsius) at Houston. Temperatures above 100 °F (38 °C) are not expected here this month.
The thermometer dips to 60 °F (16 °C) or below on an average of 3 nights. But most years May doesn't get as cold as 50 °F (10 °C).
Rain
| 5.4 in | total precipitation | 138 mm |
| 8 days | of rain |
Half the time, Houston receives 2.3 to 7.8 inches (59 to 198 mm) of rainfall in May. One in four years has drier weather, while another one in four is wetter.
Sun
| 62 % | sunshine |
| 6 days | clear skies |
The sun's rays reach the ground in Houston during 62 percent of daylight hours on average in May, for a total of 262 hours in the month. Typically on 6 days this month the sky is mainly clear, with at most 30 percent cloud cover.
Sunlight in May at Houston lasts for 13 hours and 39 minutes a day on average. The shortest day of the month is the 1st with 13 hours and 20 minutes of daylight. By the end of the month, the days have lengthened to 13:55 from sunrise to sunset. These durations can vary by a minute or two from year to year.
Humidity
| 75 % | May average humidity |
The relative humidity in Houston during May usually peaks at 91 percent in the morning then drops to 57 percent by mid afternoon.
| Local Time | 12 am | 3 am | 6 am | 9 am | 12 pm | 3 pm | 6 pm | 9 pm |
| Humidity % | 87 | 90 | 91 | 73 | 59 | 57 | 63 | 80 |
Wind
| 8.2 mph | May wind speed average | 13.2 kph |
May is windier than most other months at Houston.
Storms
| 3 days | rainfall of 0.5 inches (13 mm) or more |
| 7 days | with thunderstorms in May |
Reference
The weather data here are long-term averages provided by the US National Centers for Environmental Information (NCEI). Temperature and precipitation are 1991-2020 normals while humidity and thunderstorms are 1961-1990 normals.