Austin Weather in May
Austin, Texas usually sees unsettled weather in May. The rainfall is heaviest, humidity highest and thunderstorms more frequent now than any other month.
This page gives detailed information on the typical May temperature, precipitation, sun, humidity, wind and storms for Austin. The numbers here are historical averages based on climate data gathered at Camp Mabry, located at few miles from downtown Austin.
Temperature
| 87 °F | May average high | 31 °C |
| 67 °F | May average low | 19 °C |
| 11 days | 90 °F max. or more (32 °C) |
| 21 days | 70 °F min. or less (21 °C) |
The temperature rises most days during May to over 80 degrees Fahrenheit (27 degrees Celsius) in Austin. In some years the temperature climbs as high as 100 °F (38 °C) this month.
The thermometer dips to 60 °F (16 °C) or below on an average of 5 nights. But it's rare for May to get as cold as 50 °F (10 °C).
Rain
| 5.0 in | total precipitation | 128 mm |
| 9 days | of rain |
May is Austin's wettest month. Half the time, Austin receives 2.9 to 7.1 inches (74 to 180 mm) of rainfall in May. One in four years has drier weather, while another one in four is wetter.
Sun
| 56 % | sunshine |
| 6 days | clear skies |
The sun's rays reach the ground in Austin during 56 percent of daylight hours on average in May, for a total of 237 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 Austin lasts for 13 hours and 41 minutes a day on average. The shortest day of the month is the 1st with 13 hours and 21 minutes of daylight. By the end of the month, the days have lengthened to 13:58 from sunrise to sunset. These durations can vary by a minute or two from year to year.
Humidity
| 71 % | May average humidity |
May is Austin's most humid month. The relative humidity usually peaks at 88 percent in the morning then drops to 54 percent by mid afternoon.
| Local Time | 12 am | 3 am | 6 am | 9 am | 12 pm | 3 pm | 6 pm | 9 pm |
| Humidity % | 81 | 86 | 88 | 75 | 60 | 54 | 57 | 71 |
Wind
| 9.0 mph | May wind speed average | 14.5 kph |
May is windier than most other months in Austin.
Storms
| 3 days | rainfall of 0.5 inches (13 mm) or more |
| 7 days | with thunderstorms in May |
Thunderstorms and heavy rainstorms at Austin happen most often during 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.