Weather on September 20
Round Rock, TX
55 Years of Data
Avg High
90°F
Avg Low
64°F
Warmest
2024
87°F avg
Coldest
1995
36°F avg
About This Date
September 20th in Round Rock, TX typically brings hot fall weather, with average highs around 90°F and lows near 64°F — a 26°F daily swing. Over 55 years of records, the warmest September 20th was in 2024 (87°F average), while the coldest was 1995 (36°F) — a 51°F range across recorded history. Rain or other precipitation has occurred on about 24% of September 20th dates historically, with the wettest September 20th recording 6.35" of rain. The last decade has been 3.1°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.1°F warmer on this date compared to 20-30 years ago.
Planning for September 20th in Round Rock, TX? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
1.1°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 95° | 68° | 82° | — | — |
| 2024warmest | 98° | 76° | 87° | — | — |
| 2023 | 96° | 72° | 84° | — | — |
| 2022 | 95° | 72° | 83° | — | — |
| 2021 | 98° | 70° | 84° | — | — |
| 2020 | 81° | 60° | 70° | — | — |
| 2019 | 95° | 74° | 84° | — | — |
| 2018 | 91° | 69° | 80° | — | — |
| 2017 | 92° | 75° | 83° | — | — |
| 2016 | 97° | 72° | 84° | — | — |
| 2015 | 92° | 66° | 79° | — | — |
| 2014 | 81° | 72° | 76° | 0.03" | — |
| 2013 | 93° | 74° | 83° | 0.13" | — |
| 2012 | 86° | 58° | 72° | — | — |
| 2011 | 93° | 58° | 75° | — | — |
| 2010 | 86° | 64° | 75° | — | — |
| 2009 | 85° | 67° | 76° | — | — |
| 2008 | 86° | 58° | 72° | — | — |
| 2007 | 91° | 71° | 81° | — | — |
| 2006 | 85° | 57° | 71° | — | — |
| 2005 | 98° | 68° | 83° | — | — |
| 2004 | 92° | 65° | 78° | — | — |
| 2003 | 79° | 64° | 71° | — | — |
| 2002 | 84° | 59° | 72° | 0.13" | — |
| 2001 | 92° | 73° | 82° | — | — |
| 2000 | 94° | 64° | 79° | — | — |
| 1999 | 96° | 68° | 82° | — | — |
| 1998 | 96° | 70° | 83° | — | — |
| 1997 | 97° | 69° | 83° | — | — |
| 1996 | 89° | 64° | 77° | 6.35" | — |
| 1995coldest | 97° | -26° | 36° | 1.63" | — |
| 1994 | 86° | 60° | 73° | — | — |
| 1993 | 94° | 73° | 83° | — | — |
| 1992 | 92° | 73° | 82° | — | — |
| 1991 | 57° | 51° | 54° | 0.38" | — |
| 1990 | 93° | 71° | 82° | 1.47" | — |
| 1989 | 88° | 59° | 73° | — | — |
| 1988 | 92° | 75° | 83° | — | — |
| 1987 | 78° | 63° | 70° | — | — |
| 1986 | 89° | 69° | 79° | — | — |
| 1985 | 91° | 68° | 80° | — | — |
| 1984 | 86° | 65° | 75° | — | — |
| 1983 | 87° | 66° | 77° | 1.5" | — |
| 1982 | 92° | 68° | 80° | — | — |
| 1981 | 85° | 45° | 65° | — | — |
| 1980 | 94° | 67° | 80° | 0.05" | — |
| 1979 | 80° | 59° | 70° | 1.22" | — |
| 1978 | 94° | 68° | 81° | — | — |
| 1977 | 97° | 59° | 78° | 0.3" | — |
| 1976 | 79° | 72° | 75° | 0.38" | — |
| 1975 | 90° | 64° | 77° | — | — |
| 1974 | 89° | 70° | 79° | — | — |
| 1973 | 91° | 72° | 81° | — | — |
| 1972 | 97° | 71° | 84° | — | — |
| 1971 | 77° | 48° | 63° | 0.3" | — |
55 years of data from GEORGETOWN