Weather on May 21
Round Rock, TX
55 Years of Data
Avg High
87°F
Avg Low
66°F
Warmest
2008
84°F avg
Coldest
1981
69°F avg
About This Date
May 21st in Round Rock, TX typically brings warm spring weather, with average highs around 87°F and lows near 66°F. Over 30 years of records, the warmest May 21st was in 2008 (84°F average), while the coldest was 1981 (69°F) — a 15°F range across recorded history. Rain or other precipitation has occurred on about 37% of May 21st dates historically, with the wettest May 21st recording 2.57" of rain.
Planning for May 21st in Round Rock, TX? Stay hydrated and seek shade during peak afternoon hours. Consider bringing rain gear or an umbrella.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 93° | 67° | 80° | — | — |
| 2024 | 92° | 70° | 81° | — | — |
| 2023 | 80° | 65° | 72° | — | — |
| 2022 | 93° | 75° | 84° | — | — |
| 2021 | 84° | 62° | 73° | — | — |
| 2020 | 92° | 68° | 80° | 0.03" | — |
| 2019 | 88° | 75° | 81° | — | — |
| 2018 | 78° | 66° | 72° | 1.55" | — |
| 2017 | 78° | 64° | 71° | 0.41" | — |
| 2016 | 80° | 61° | 70° | — | — |
| 2015 | 87° | 62° | 75° | 0.18" | — |
| 2014 | 88° | 66° | 77° | — | — |
| 2013 | 92° | 72° | 82° | — | — |
| 2012 | 88° | 63° | 75° | — | — |
| 2011 | 88° | 65° | 76° | 0.33" | — |
| 2010 | 86° | 72° | 79° | — | — |
| 2009 | 83° | 56° | 69° | — | — |
| 2008warmest | 98° | 70° | 84° | — | — |
| 1982 | 90° | 72° | 81° | — | — |
| 1981coldest | 80° | 57° | 69° | — | — |
| 1980 | 84° | 63° | 73° | 0.15" | — |
| 1979 | 83° | 69° | 76° | 0.05" | — |
| 1978 | 86° | 68° | 77° | 0.91" | — |
| 1977 | 86° | 62° | 74° | 2.57" | — |
| 1976 | 83° | 64° | 73° | 0.43" | — |
| 1975 | 90° | 72° | 81° | — | — |
| 1974 | 88° | 70° | 79° | — | — |
| 1973 | 92° | 69° | 80° | — | — |
| 1972 | 88° | 63° | 75° | — | — |
| 1971 | 85° | 64° | 74° | 0.23" | — |
30 years of data from GEORGETOWN