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 Weather iconTemperature

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).

Rainy Weather iconRain

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.

Sunny Weather iconSun

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.

Humid Weather iconHumidity

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 Time12 am3 am6 am9 am12 pm3 pm6 pm9 pm
Humidity % 87 90 91 73 59 57 63 80

Windy Weather iconWind

8.2 mph May wind speed average 13.2 kph

May is windier than most other months at Houston.

Stormy Weather iconStorms

3 days rainfall of 0.5 inches (13 mm) or more
7 days with thunderstorms in May

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.

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