Weather on August 21
Round Rock, TX
55 Years of Data
Avg High
98°F
Avg Low
73°F
Warmest
2023
91°F avg
Coldest
2015
74°F avg
About This Date
August 21st in Round Rock, TX typically brings hot summer weather, with average highs around 98°F and lows near 73°F — a 25°F daily swing. Over 30 years of records, the warmest August 21st was in 2023 (91°F average), while the coldest was 2015 (74°F) — a 17°F range across recorded history. Rain or other precipitation has occurred on about 3% of August 21st dates historically, with the wettest August 21st recording 2.95" of rain.
Planning for August 21st in Round Rock, TX? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 99° | 70° | 84° | — | — |
| 2024 | 105° | 75° | 90° | — | — |
| 2023warmest | 106° | 77° | 91° | — | — |
| 2022 | 97° | 76° | 86° | — | — |
| 2021 | 95° | 76° | 85° | — | — |
| 2020 | 98° | 68° | 83° | — | — |
| 2019 | 100° | 76° | 88° | — | — |
| 2018 | 102° | 76° | 89° | — | — |
| 2017 | 97° | 74° | 85° | — | — |
| 2016 | 79° | 70° | 74° | 2.95" | — |
| 2015coldest | 79° | 70° | 74° | — | — |
| 2014 | 100° | 77° | 89° | — | — |
| 2013 | 97° | 67° | 82° | — | — |
| 2012 | 96° | 70° | 83° | — | — |
| 2011 | 104° | 76° | 90° | — | — |
| 2010 | 99° | 77° | 88° | — | — |
| 2009 | 101° | 77° | 89° | — | — |
| 2008 | 93° | 71° | 82° | — | — |
| 1982 | 101° | 72° | 86° | — | — |
| 1981 | 95° | 72° | 83° | — | — |
| 1980 | 106° | 69° | 87° | — | — |
| 1979 | 98° | 69° | 84° | — | — |
| 1978 | 101° | 70° | 85° | — | — |
| 1977 | 102° | 74° | 88° | — | — |
| 1976 | 92° | 65° | 78° | — | — |
| 1975 | 99° | 82° | 90° | — | — |
| 1974 | 95° | 71° | 83° | — | — |
| 1973 | 100° | 68° | 84° | — | — |
| 1972 | 98° | 71° | 85° | — | — |
| 1971 | 94° | 71° | 82° | — | — |
30 years of data from GEORGETOWN