Dallas Weather in May

The weather at Dallas, Texas often turns wet and stormy during May. This month sees some of the year's greatest rainfall, highest humidity and most thunderstorms.

This page gives detailed information on the typical May temperature, precipitation, sun, humidity, wind and storms for Dallas. The temperature, precipitation and wind speed numbers here are historical averages based on climate data gathered at the Dallas Love Field Airport, located a few miles from downtown Dallas. The rest of the measurements are averages from the nearby Dallas - Fort Worth International Airport.

Temperature Weather iconTemperature

85 °F May average high 29 °C
66 °F May average low 19 °C
25 days 80 °F max. or more (27 °C)
23 days 70 °F min. or less (21 °C)

The temperature rises nearly every day in May to over 70 degrees Fahrenheit (21 degrees Celsius) at Dallas. The city averages 8 days this month when the thermometer reaches into the 90s °F (over 32 °C). Temperatures of 100 °F (38 °C) or above occur about once a decade here during May.

The thermometer dips to 60 °F (16 °C) or below on an average of 6 nights for the month. Only in some years does May get as cold as 50 °F (10 °C).

Rainy Weather iconRain

4.6 in total precipitation 116 mm
9 days of rain

Half the time, Dallas receives 2.6 to 6.1 inches (66 to 155 mm) of rainfall in May. One in four years has drier weather, while another one in four is wetter. May is the rainiest month for Dallas.

Sunny Weather iconSun

57 % sunshine
8 days clear skies

The sun's rays reach the ground in Dallas during 57 percent of daylight hours on average in May, for a total of 245 hours in the month. Typically on 8 days this month the sky is mainly clear, with at most 30 percent cloud cover.

Sunlight in May at Dallas lasts for 13 hours and 51 minutes a day on average. The shortest day of the month is the 1st with 13 hours and 29 minutes of daylight. By the end of the month, the days have lengthened to 14:10 from sunrise to sunset. These durations can vary by a minute or two from year to year.

Humid Weather iconHumidity

70 % May average humidity

The relative humidity in Dallas during May usually peaks at 87 percent in the morning then drops to 53 percent by mid afternoon. May is the most humid time of year for Dallas.

Local Time12 am3 am6 am9 am12 pm3 pm6 pm9 pm
Humidity % 78 83 87 72 59 53 56 71

Windy Weather iconWind

10.9 mph May wind speed average 17.5 kph

May is windier than most other months in Dallas.

Stormy Weather iconStorms

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

Dallas gets thunderstorms more frequently during May than any other month.


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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