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 weather for Houston.

You can jump directly to data and descriptions for:

The numbers here are historical averages based on climate data gathered at the George Bush Intercontinental Airport, located north of downtown Houston.

Temperature Weather iconTemperature

86 °F May average high 30 °C
68 °F May average low 20 °C

In most years, Houston averages a daily maximum temperature for May that's between 84 and 88 degrees Fahrenheit (29 to 31 degrees Celsius). The minimum temperature usually falls between 65 and 70 °F (19 to 21 °C).

The days at Houston warm rapidly during May. By the end of the month, the temperature has climbed around 7 °F (4 °C) above what it was at the start.

7 days 90 °F max. or more (32 °C)
19 days 70 °F min. or less (21 °C)

The temperature rises most days in May to over 80 °F (27 °C) 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 4 nights. But most years May doesn't get as cold as 50 °F (10 °C).

Rainy Weather iconRain

5.1 in total precipitation 129 mm
8 days of rain

Half the time, Houston receives 2 to 7 inches (57 to 185 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

These weather data are long-term historical averages provided by the National Climatic Data Center of the United States. The temperature and precipitation numbers are 1981-2010 normals while the humidity and thunderstorm statistics are 1961-1990 normals.

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