Climate averages 1991–2020
Round Rock weather
in May.
A hot, wet month: the 5th warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a hot month in Round Rock: daytime highs average 28.9°C and nights cool to about 19.3°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 110 mm of rain on roughly 11 days, which makes May a wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 13 h 41 min on an average May day.
The nearest other city in this atlas is Austin (28 km away). In May its highs average 29.3°C, about as warm as Round Rock, with 116 mm of rain.
Among the 498 cities listed in the United States, Round Rock ranks joint 58th of 498 for the warmest May highs and joint 400th of 498 for the driest May (rainfall, lowest first). The mean May high of those 498 cities is 23.8°C; Round Rock is 5.1°C warmer than that mean.
From May to June, average highs rise by 3.5°C to 32.4°C, and monthly rainfall falls from 110 mm to 72 mm.
The annual picture
May in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Round Rock climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 15.6°C5.8°C | 5.8°C | 59 | 6.8 | 10.410 h |
| February | 17.8°C7.6°C | 7.6°C | 61 | 7.4 | 11.111 h |
| March | 21.4°C11.0°C | 11.0°C | 74 | 8.8 | 12.012 h |
| April | 25.5°C14.9°C | 14.9°C | 76 | 8.2 | 12.913 h |
| May, selected | 28.9°C19.3°C | 19.3°C | 110 | 10.8 | 13.714 h |
| June | 32.4°C22.7°C | 22.7°C | 72 | 8.7 | 14.114 h |
| July | 34.5°C24.2°C | 24.2°C | 39 | 5.7 | 13.914 h |
| August | 34.7°C24.6°C | 24.6°C | 54 | 5.8 | 13.313 h |
| September | 31.1°C21.5°C | 21.5°C | 74 | 7.4 | 12.412 h |
| October | 26.4°C16.4°C | 16.4°C | 86 | 7.1 | 11.511 h |
| November | 20.3°C10.8°C | 10.8°C | 69 | 6.6 | 10.611 h |
| December | 16.3°C6.8°C | 6.8°C | 70 | 7.5 | 10.210 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
May in nearby cities
- Austin in MayUnited States · 28 kmHigh 29.3°C · Low 19.5°C · 116 mm rain
- Killeen in MayUnited States · 68 kmHigh 28.5°C · Low 18.8°C · 115 mm rain
- Temple in MayUnited States · 73 kmHigh 28.3°C · Low 18.8°C · 123 mm rain
- New Braunfels in MayUnited States · 99 kmHigh 29.4°C · Low 19.7°C · 108 mm rain
- Waco in MayUnited States · 126 kmHigh 28.6°C · Low 19.0°C · 119 mm rain
- Bryan in MayUnited States · 127 kmHigh 29.0°C · Low 19.3°C · 106 mm rain
- College Station in MayUnited States · 129 kmHigh 29.1°C · Low 19.4°C · 106 mm rain
- San Antonio in MayUnited States · 144 kmHigh 29.9°C · Low 19.9°C · 103 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Round Rock) is explained once on the Round Rock year overview and on the Sources, method and limits page.