Weather on September 15
Round Rock, TX
55 Years of Data
Avg High
90°F
Avg Low
67°F
Warmest
2011
86°F avg
Coldest
2012
66°F avg
About This Date
September 15th in Round Rock, TX typically brings hot fall weather, with average highs around 90°F and lows near 67°F. Over 30 years of records, the warmest September 15th was in 2011 (86°F average), while the coldest was 2012 (66°F) — a 20°F range across recorded history. Rain or other precipitation has occurred on about 17% of September 15th dates historically, with the wettest September 15th recording 0.89" of rain.
Planning for September 15th in Round Rock, TX? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 97° | 69° | 83° | — | — |
| 2024 | 97° | 74° | 85° | — | — |
| 2023 | 93° | 69° | 81° | 0.2" | — |
| 2022 | 90° | 64° | 77° | — | — |
| 2021 | 83° | 70° | 76° | — | — |
| 2020 | 88° | 71° | 79° | — | — |
| 2019 | 98° | 69° | 84° | — | — |
| 2018 | 81° | 72° | 76° | 0.89" | — |
| 2017 | 93° | 71° | 82° | — | — |
| 2016 | 89° | 69° | 79° | 0.05" | — |
| 2015 | 88° | 62° | 75° | — | — |
| 2014 | 74° | 62° | 68° | — | — |
| 2013 | 96° | 70° | 83° | — | — |
| 2012coldest | 69° | 63° | 66° | 0.46" | — |
| 2011warmest | 102° | 69° | 86° | — | — |
| 2010 | 94° | 76° | 85° | — | — |
| 2009 | 77° | 69° | 73° | — | — |
| 2008 | 92° | 64° | 78° | — | — |
| 1982 | 97° | 74° | 85° | — | — |
| 1981 | 89° | 63° | 76° | — | — |
| 1980 | 96° | 66° | 81° | — | — |
| 1979 | 84° | 54° | 69° | — | — |
| 1978 | 92° | 70° | 81° | — | — |
| 1977 | 96° | 59° | 78° | — | — |
| 1976 | 92° | 68° | 80° | — | — |
| 1975 | 89° | 67° | 78° | — | — |
| 1974 | 79° | 62° | 70° | 0.15" | — |
| 1973 | 89° | 59° | 74° | — | — |
| 1972 | 93° | 72° | 82° | — | — |
| 1971 | 94° | 70° | 82° | — | — |
30 years of data from GEORGETOWN