Round Rock Weather in May
Average highs run from 81°F on May 1 to 89°F on May 31, and lows from 59°F to 68°F. Normal precipitation for the month is 4.11 in over about 9 wet days.
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
- 84°F
- Average low
- 64°F
- Precipitation
- 4.11 in
- Record high
- 100°FMay 6, 1998
- Record low
- 42°FMay 3, 2013
- Chance of a freeze
- 0%
- Days of 90°F or more
- 9.0
- Daylight
- 13 h 22 min to 13 h 59 min
- Cloud cover
- 60%
- Humidity
- 71%
- Dew point
- 64°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 | 81°F | 59°F | 96°F 2002 | 45°F 2005 | 25% |
| May 2 | 81°F | 59°F | 96°F 1964 | 47°F 1994 | 25% |
| May 3 | 81°F | 59°F | 94°F 1964 | 42°F 2013 | 25% |
| May 4 | 81°F | 60°F | 99°F 1984 | 42°F 2013 | 25% |
| May 5 | 82°F | 60°F | 98°F 1984 | 46°F 2013 | 25% |
| May 6 | 82°F | 60°F | 100°F 1998 | 47°F 2013 | 26% |
| May 7 | 82°F | 61°F | 98°F 1998 | 46°F 1992 | 26% |
| May 8 | 82°F | 61°F | 98°F 1998 | 49°F 2010 | 26% |
| May 9 | 82°F | 61°F | 96°F 1998 | 45°F 1984 | 26% |
| May 10 | 83°F | 62°F | 96°F 2011 | 49°F 1984 | 27% |
| May 11 | 83°F | 62°F | 97°F 1967 | 45°F 1981 | 27% |
| May 12 | 83°F | 62°F | 96°F 1967 | 47°F 1979 | 27% |
| May 13 | 83°F | 63°F | 96°F 2010 | 49°F 1971 | 27% |
| May 14 | 84°F | 63°F | 94°F 1984 | 46°F 1971 | 27% |
| May 15 | 84°F | 64°F | 96°F 2010 | 42°F 2014 | 27% |
| May 16 | 84°F | 64°F | 95°F 1996 | 50°F 1973 | 27% |
| May 17 | 84°F | 64°F | 95°F 1996 | 52°F 1970 | 27% |
| May 18 | 85°F | 65°F | 95°F 1996 | 51°F 1976 | 27% |
| May 19 | 85°F | 65°F | 95°F 2006 | 50°F 2002 | 27% |
| May 20 | 85°F | 65°F | 98°F 2006 | 50°F 2002 | 27% |
| May 21 | 86°F | 66°F | 98°F 2008 | 52°F 2002 | 27% |
| May 22 | 86°F | 66°F | 97°F 1996 | 51°F 2001 | 27% |
| May 23 | 86°F | 66°F | 98°F 1996 | 54°F 1967 | 27% |
| May 24 | 87°F | 66°F | 97°F 1996 | 57°F 1967 | 27% |
| May 25 | 87°F | 67°F | 95°F 1996 | 58°F 1971 | 27% |
| May 26 | 87°F | 67°F | 99°F 2011 | 60°F 1979 | 27% |
| May 27 | 88°F | 67°F | 96°F 2006 | 58°F 1988 | 27% |
| May 28 | 88°F | 68°F | 99°F 2011 | 56°F 1976 | 27% |
| May 29 | 88°F | 68°F | 98°F 2011 | 56°F 1992 | 26% |
| May 30 | 89°F | 68°F | 100°F 2003 | 55°F 1984 | 26% |
| May 31 | 89°F | 68°F | 98°F 1990 | 52°F 1984 | 26% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (CDT).
- May 1
- sunrise 6:47 AM, sunset 8:09 PM
- May 31
- sunrise 6:29 AM, sunset 8:28 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00410433 (Austin Great Hills), public domain. Records: NOAA GHCN-Daily, station USC00412820, 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 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.