Weather on September 30
Round Rock, TX
55 Years of Data
Avg High
86°F
Avg Low
60°F
Warmest
2019
85°F avg
Coldest
1984
53°F avg
About This Date
September 30th in Round Rock, TX typically brings warm fall weather, with average highs around 86°F and lows near 60°F — a 26°F daily swing. Over 55 years of records, the warmest September 30th was in 2019 (85°F average), while the coldest was 1984 (53°F) — a 32°F range across recorded history. Rain or other precipitation has occurred on about 16% of September 30th dates historically, with the wettest September 30th recording 3.89" of rain. The last decade has been 2.8°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.8°F warmer on this date compared to 20-30 years ago.
Planning for September 30th in Round Rock, TX? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.8°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 91° | 62° | 77° | — | — |
| 2024 | 92° | 60° | 76° | — | — |
| 2023 | 95° | 70° | 82° | — | — |
| 2022 | 90° | 59° | 74° | — | — |
| 2021 | 87° | 66° | 77° | — | — |
| 2020 | 80° | 51° | 66° | — | — |
| 2019warmest | 95° | 76° | 85° | — | — |
| 2018 | 76° | 68° | 72° | 1.6" | — |
| 2017 | 72° | 63° | 67° | 0.03" | — |
| 2016 | 81° | 56° | 68° | — | — |
| 2015 | 90° | 67° | 78° | — | — |
| 2014 | 87° | 63° | 75° | — | — |
| 2013 | 73° | 61° | 67° | — | — |
| 2012 | 79° | 65° | 72° | 2.51" | — |
| 2011 | 101° | 68° | 84° | — | — |
| 2010 | 87° | 61° | 74° | — | — |
| 2009 | 81° | 58° | 69° | 0.05" | — |
| 2008 | 90° | 58° | 74° | — | — |
| 2007 | 93° | 66° | 80° | 0.56" | — |
| 2006 | 81° | 61° | 71° | — | — |
| 2005 | 74° | 66° | 70° | — | — |
| 2004 | 88° | 61° | 74° | — | — |
| 2003 | 83° | 54° | 68° | — | — |
| 2002 | 89° | 66° | 78° | — | — |
| 2001 | 82° | 54° | 68° | — | — |
| 2000 | 84° | 54° | 69° | — | — |
| 1999 | 78° | 49° | 63° | — | — |
| 1998 | 95° | 70° | 82° | — | — |
| 1997 | 93° | 66° | 80° | — | — |
| 1996 | 77° | 52° | 64° | — | — |
| 1995 | 90° | 68° | 79° | — | — |
| 1994 | 93° | 60° | 77° | — | — |
| 1993 | 89° | 59° | 74° | — | — |
| 1992 | 83° | 50° | 66° | — | — |
| 1991 | 80° | 53° | 67° | — | — |
| 1990 | 88° | 64° | 76° | — | — |
| 1989 | 84° | 55° | 70° | — | — |
| 1988 | 83° | 56° | 69° | 3.1" | — |
| 1987 | 82° | 55° | 69° | — | — |
| 1986 | 91° | 75° | 83° | — | — |
| 1985 | 73° | 48° | 61° | 3.89" | — |
| 1984coldest | 61° | 45° | 53° | — | — |
| 1983 | 86° | 54° | 70° | — | — |
| 1982 | 92° | 68° | 80° | — | — |
| 1981 | 92° | 59° | 75° | — | — |
| 1980 | 74° | 59° | 66° | 0.36" | — |
| 1979 | 95° | 54° | 74° | — | — |
| 1978 | 94° | 53° | 73° | — | — |
| 1977 | 98° | 70° | 84° | — | — |
| 1976 | 85° | 58° | 71° | — | — |
| 1975 | 84° | 57° | 71° | — | — |
| 1974 | 79° | 44° | 61° | — | — |
| 1973 | 86° | 52° | 69° | — | — |
| 1972 | 95° | 51° | 73° | 1.12" | — |
| 1971 | 91° | 68° | 80° | — | — |
55 years of data from GEORGETOWN