August is one of the warmer months of the year in Round Rock, with average highs near 36.6°C and lows around 24.1°C (mean 30.4°C). It is one of the drier months, averaging 55 mm of rainfall and 59% relative humidity across the period.
August is one of the warmer months of the year in Round Rock. Across 45 years of records, the warmest August in Round Rock was 2023 — when the month averaged 34.1°C — while the coldest was 1992 at 27.4°C. Typical August days reach 36.6°C with nights near 24.1°C. The long-term trend is warming, about 0.4°C per decade.
August is one of the drier months in Round Rock, averaging 55 mm of rainfall. The wettest August on record was 2017 with 238 mm, while the driest was 2011 at 2 mm.
Relative humidity in Round Rock during August averages 59%. The most humid August was 2007 at 82%, and the least humid was 2023 at 41%.
August receives about 6.3 kWh/m²/day of solar energy in Round Rock. The sunniest August was 2023 at 7 kWh/m²/day, and the cloudiest was 1996 at 5.6.
Average wind speed in Round Rock during August is 2.6 m/s. The windiest August was 2017 at 3.3 m/s, while the calmest was 2025 at 1.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 30.2°C | 29.7°C | 29.9°C | 31.1°C | 31.6°C | +1.4°C |
| Avg High | 36.7°C | 35.7°C | 35.6°C | 37.6°C | 38.3°C | +1.6°C |
| Avg Low | 23.7°C | 23.7°C | 24.0°C | 24.7°C | 24.9°C | +1.2°C |
| Avg Rain | 42 mm | 61 mm | 59 mm | 64 mm | 43 mm | +2 mm |
August temperatures in Round Rock have risen by about 1.3°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 15.2°C (1986) to a record high of 44.6°C (2024).
Rainfall in August is one of the drier months, averaging 55 mm, with a wettest year of 238 mm.
A quieter season to visit Round Rock
If your dates are flexible, the more temperate months of October and April tend to be the most comfortable for visiting Round Rock. That said, August — with days averaging 36.6°C and nights around 24.1°C (mean 30.4°C) and moderate rainfall (55 mm) — can still be rewarding for travellers who don't mind the warmth, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 38.1°C | 31.3°C | 24.4°C | 40.4°C | 22.2°C | 42 mm | 56% | 1.9 m/s | 6.2 |
| 2024 | 38.7°C | 31.8°C | 25.0°C | 44.6°C | 23.1°C | 28 mm | 57% | 2.2 m/s | 6.7 |
| 2023 🔥 | 41.9°C | 34.1°C | 26.4°C | 44.4°C | 23.4°C | 5 mm | 41% | 2.9 m/s | 7 |
| 2022 | 37.0°C | 31.2°C | 25.4°C | 40.9°C | 23.3°C | 85 mm | 61% | 2.6 m/s | 5.8 |
| 2021 | 35.2°C | 29.5°C | 23.9°C | 38.0°C | 22.0°C | 69 mm | 69% | 2.3 m/s | 6.1 |
| 2020 | 38.8°C | 31.6°C | 24.5°C | 42.5°C | 21.8°C | 31 mm | 53% | 2.7 m/s | 6.8 |
| 2019 | 38.9°C | 32.4°C | 25.8°C | 41.5°C | 24.7°C | 16 mm | 54% | 2.6 m/s | 6.5 |
| 2018 | 37.4°C | 30.9°C | 24.5°C | 39.8°C | 21.6°C | 43 mm | 57% | 2.8 m/s | 6.5 |
| 2017 🌧️ | 35.1°C | 29.5°C | 24.0°C | 39.7°C | 19.3°C | 238 mm | 65% | 3.3 m/s | 5.8 |
| 2016 | 33.2°C | 28.5°C | 23.7°C | 40.4°C | 21.6°C | 227 mm | 74% | 2.3 m/s | 5.8 |
| 2015 | 38.1°C | 31.3°C | 24.5°C | 42.2°C | 21.8°C | 16 mm | 53% | 2.4 m/s | 6.5 |
| 2014 | 37.8°C | 31.1°C | 24.4°C | 40.5°C | 19.4°C | 17 mm | 54% | 2.9 m/s | 6.6 |
| 2013 | 37.4°C | 30.7°C | 24.0°C | 41.2°C | 18.5°C | 25 mm | 57% | 2.5 m/s | 6.5 |
| 2012 | 37.6°C | 30.9°C | 24.2°C | 42.9°C | 20.8°C | 42 mm | 56% | 2.8 m/s | 6.5 |
| 2011 | 41.2°C | 33.8°C | 26.5°C | 44.2°C | 24.2°C | 2 mm | 42% | 2.9 m/s | 6.9 |
| 2010 | 38.8°C | 31.9°C | 25.1°C | 42.3°C | 20.6°C | 19 mm | 54% | 2.6 m/s | 6.8 |
| 2009 | 37.5°C | 31.1°C | 24.7°C | 40.2°C | 21.4°C | 30 mm | 55% | 2.7 m/s | 6.5 |
| 2008 | 35.0°C | 29.4°C | 23.8°C | 40.6°C | 21.1°C | 84 mm | 66% | 2.3 m/s | 5.9 |
| 2007 | 31.7°C | 27.6°C | 23.4°C | 34.7°C | 21.5°C | 66 mm | 82% | 2.1 m/s | 6.2 |
| 2006 | 36.8°C | 30.8°C | 24.7°C | 40.3°C | 19.8°C | 19 mm | 59% | 2.8 m/s | 6.5 |
| 2005 | 34.3°C | 29.0°C | 23.7°C | 38.4°C | 21.2°C | 87 mm | 69% | 2.1 m/s | 6.1 |
| 2004 | 34.4°C | 28.5°C | 22.6°C | 39.8°C | 18.5°C | 74 mm | 65% | 2.4 m/s | 6.3 |
| 2003 | 36.5°C | 30.4°C | 24.3°C | 43.7°C | 19.6°C | 52 mm | 60% | 2.4 m/s | 6.2 |
| 2002 | 35.4°C | 29.5°C | 23.5°C | 40.0°C | 20.2°C | 27 mm | 67% | 2.4 m/s | 6.2 |
| 2001 | 36.3°C | 30.6°C | 24.9°C | 41.4°C | 22.1°C | 142 mm | 59% | 2.7 m/s | 6 |
| 2000 | 38.5°C | 31.6°C | 24.8°C | 42.6°C | 23.3°C | 9 mm | 49% | 2.7 m/s | 6.8 |
| 1999 | 38.9°C | 32.2°C | 25.5°C | 42.3°C | 23.2°C | 6 mm | 49% | 2.4 m/s | 6.7 |
| 1998 | 34.9°C | 29.6°C | 24.4°C | 41.9°C | 22.1°C | 94 mm | 67% | 2.1 m/s | 5.7 |
| 1997 | 36.5°C | 29.9°C | 23.3°C | 38.8°C | 20.0°C | 32 mm | 60% | 2.6 m/s | 6.4 |
| 1996 | 33.3°C | 28.5°C | 23.6°C | 41.6°C | 21.4°C | 159 mm | 69% | 2.6 m/s | 5.6 |
| 1995 | 35.2°C | 29.8°C | 24.3°C | 39.6°C | 21.1°C | 64 mm | 66% | 2.3 m/s | 6.2 |
| 1994 | 34.8°C | 28.9°C | 23.1°C | 38.5°C | 21.7°C | 99 mm | 66% | 2.4 m/s | 6.1 |
| 1993 | 38.2°C | 31.6°C | 25.0°C | 40.7°C | 23.6°C | 8 mm | 51% | 3.1 m/s | 6.8 |
| 1992 ❄️ | 34.0°C | 27.4°C | 20.9°C | 36.5°C | 16.0°C | 44 mm | 64% | 2.4 m/s | 6.4 |
| 1991 | 35.2°C | 29.3°C | 23.3°C | 38.4°C | 21.4°C | 83 mm | 65% | 2.2 m/s | 6.1 |
| 1990 | 36.5°C | 29.9°C | 23.2°C | 40.7°C | 19.7°C | 21 mm | 58% | 2.7 m/s | 6.5 |
| 1989 | 36.0°C | 29.5°C | 23.0°C | 39.4°C | 16.6°C | 39 mm | 59% | 3 m/s | 6.1 |
| 1988 | 37.5°C | 31.0°C | 24.5°C | 41.4°C | 21.9°C | 31 mm | 55% | 2.5 m/s | 6.4 |
| 1987 | 36.3°C | 30.0°C | 23.6°C | 39.5°C | 21.2°C | 25 mm | 62% | 2.9 m/s | 6.4 |
| 1986 | 36.1°C | 29.7°C | 23.3°C | 41.5°C | 15.2°C | 59 mm | 57% | 2.7 m/s | 6 |
| 1985 | 38.9°C | 31.8°C | 24.7°C | 41.3°C | 22.5°C | 13 mm | 48% | 2.8 m/s | 6.8 |
| 1984 | 37.0°C | 30.2°C | 23.5°C | 41.4°C | 20.1°C | 23 mm | 55% | 2.8 m/s | 6.4 |
| 1983 | 34.9°C | 29.1°C | 23.4°C | 39.8°C | 21.9°C | 72 mm | 68% | 2.3 m/s | — |
| 1982 | 38.2°C | 31.4°C | 24.6°C | 41.6°C | 22.3°C | 28 mm | 52% | 3 m/s | — |
| 1981 | 35.2°C | 29.0°C | 22.8°C | 38.2°C | 18.5°C | 86 mm | 63% | 2.5 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 36.6°C with lows near 24.1°C (mean 30.4°C), based on 45 years of NASA POWER data.
August averages 55 mm of rainfall in Round Rock, one of the drier months. The wettest on record was 238 mm in 2017.
The hottest August reached 44.6°C in 2024. The coldest dipped to 15.2°C in 1986.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 1.3°C. Daytime highs moved from 36.8°C to 38.2°C and overnight lows from 23.8°C to 25°C over the same span.
August is one of the warmer months of the year in Round Rock and one of the drier months, so plan for around 36.6°C daytime highs and 24.1°C at night.
Not quite — August is the 12th coolest month in Round Rock, averaging 30.4°C.
For August in Round Rock, pack light, breathable clothing and sun protection, with typical highs of 36.6°C and lows of 24.1°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 59% — moderately humid.
Average wind speed in August is 2.6 m/s. The windiest August on record averaged 3.3 m/s (2017).
The wettest August on record was 2017 with 238 mm. On average, August sees 55 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in Round Rock behaves each August, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for August specifically, along with year-by-year records and how the month has changed over the decades.
