Round Rock Weather in May
Average highs run from 65°F on May 1 to 78°F on May 31, and lows from 39°F to 48°F.
May day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
May at a glance
- Average high
- 72°F
- Average low
- 43°F
- Record high
- 92°FMay 31, 2002
- Record low
- 13°FMay 2, 2008
- Chance of a freeze
- 57%
- Daylight
- 13 h 42 min to 14 h 29 min
- Cloud cover
- 44%
- Humidity
- 34%
- Dew point
- 27°F
- Wind
- 10.1 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation.
| Date | Normal high | Normal low | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| May 1 | 65°F | 39°F | 83°F 2021 | 19°F 2010 | |
| May 2 | 66°F | 39°F | 80°F 2020 | 13°F 2008 | |
| May 3 | 66°F | 39°F | 80°F 2000 | 14°F 2011 | |
| May 4 | 67°F | 40°F | 80°F 2000 | 21°F 2013 | |
| May 5 | 67°F | 40°F | 83°F 2017 | 25°F 2002 | |
| May 6 | 67°F | 40°F | 85°F 2020 | 22°F 1999 | |
| May 7 | 68°F | 41°F | 83°F 2018 | 19°F 2026 | |
| May 8 | 68°F | 41°F | 87°F 2018 | 28°F 2024 | |
| May 9 | 69°F | 41°F | 87°F 2018 | 26°F 2013 | |
| May 10 | 69°F | 42°F | 88°F 2018 | 18°F 2003 | |
| May 11 | 70°F | 42°F | 83°F 2026 | 21°F 2003 | |
| May 12 | 70°F | 42°F | 87°F 2026 | 19°F 2010 | |
| May 13 | 70°F | 43°F | 85°F 2006 | 18°F 2000 | |
| May 14 | 71°F | 43°F | 84°F 2022 | 20°F 2014 | |
| May 15 | 71°F | 43°F | 89°F 2022 | 23°F 2025 | |
| May 16 | 72°F | 43°F | 84°F 2022 | 27°F 2010 | |
| May 17 | 72°F | 44°F | 84°F 2003 | 27°F 1999 | |
| May 18 | 73°F | 44°F | 85°F 2022 | 27°F 1999 | |
| May 19 | 73°F | 44°F | 86°F 2008 | 29°F 2025 | |
| May 20 | 74°F | 45°F | 88°F 2005 | 19°F 2025 | |
| May 21 | 74°F | 45°F | 87°F 2005 | 26°F 1999 | |
| May 22 | 74°F | 45°F | 89°F 2005 | 22°F 2002 | |
| May 23 | 75°F | 46°F | 89°F 2000 | 22°F 2002 | |
| May 24 | 75°F | 46°F | 87°F 2000 | 23°F 2021 | |
| May 25 | 76°F | 46°F | 86°F 2005 | 26°F 2010 | |
| May 26 | 76°F | 47°F | 87°F 2022 | 29°F 2010 | |
| May 27 | 76°F | 47°F | 88°F 2020 | 23°F 2012 | |
| May 28 | 77°F | 47°F | 90°F 2014 | 25°F 2012 | |
| May 29 | 77°F | 48°F | 91°F 2000 | 25°F 2006 | |
| May 30 | 78°F | 48°F | 91°F 2002 | 28°F 2006 | |
| May 31 | 78°F | 48°F | 92°F 2002 | 24°F 2011 |
Chance of rain
Sunrise and sunset
Times for 2026, local time (MDT).
- May 1
- sunrise 6:24 AM, sunset 8:06 PM
- May 31
- sunrise 6:01 AM, sunset 8:30 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00025129 (Lukachukai), public domain. Records: NOAA GHCN-Daily, station USW00003029, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-25. Sun and moon: computed with the NOAA solar equations and Meeus.