August is one of the warmer months of the year in Houston, with average highs near 34.9°C and lows around 23.9°C (mean 29.4°C). It is about average for rainfall, averaging 107 mm of rainfall and 72% relative humidity across the period.
August is one of the warmer months of the year in Houston. Across 45 years of records, the warmest August in Houston was 2023 — when the month averaged 34.2°C — while the coldest was 1992 at 26.6°C. Typical August days reach 34.9°C with nights near 23.9°C. The long-term trend is warming, about 0.5°C per decade.
August is about average for rainfall in Houston, averaging 107 mm of rainfall. The wettest August on record was 2017 with 719 mm, while the driest was 2023 at 6 mm.
Relative humidity in Houston during August averages 72%. The most humid August was 2007 at 83%, and the least humid was 2023 at 49%.
August receives about 5.9 kWh/m²/day of solar energy in Houston. The sunniest August was 2023 at 7 kWh/m²/day, and the cloudiest were 2016 and 2017 at 5.1.
Average wind speed in Houston during August is 1.5 m/s. The windiest August was 2017 at 2.1 m/s, while the calmest were 1991 and 2005 at 1.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 28.8°C | 28.9°C | 29.0°C | 30.1°C | 30.9°C | +2.1°C |
| Avg High | 34.3°C | 34.2°C | 34.1°C | 35.9°C | 36.8°C | +2.5°C |
| Avg Low | 23.3°C | 23.6°C | 23.9°C | 24.3°C | 24.9°C | +1.6°C |
| Avg Rain | 107 mm | 98 mm | 111 mm | 137 mm | 64 mm | -43 mm |
August temperatures in Houston have risen by about 2.1°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 15.3°C (1986) to a record high of 44.7°C (2023).
Rainfall in August is about average for rainfall, averaging 107 mm, with a wettest year of 719 mm.
A quieter season to visit Houston
If your dates are flexible, the more temperate months of October and April tend to be the most comfortable for visiting Houston. That said, August — with days averaging 34.9°C and nights around 23.9°C (mean 29.4°C) and higher rainfall (107 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 | 36.8°C | 30.7°C | 24.6°C | 39.4°C | 22.5°C | 97 mm | 68% | 1.2 m/s | 5.4 |
| 2024 | 35.8°C | 30.2°C | 24.6°C | 40.4°C | 22.3°C | 32 mm | 73% | 1.2 m/s | 5.8 |
| 2023 🔥 | 41.7°C | 34.2°C | 26.8°C | 44.7°C | 23.1°C | 6 mm | 49% | 2 m/s | 7 |
| 2022 | 35.7°C | 30.5°C | 25.2°C | 40.0°C | 23.9°C | 149 mm | 72% | 1.6 m/s | 5.3 |
| 2021 | 34.3°C | 29.3°C | 24.2°C | 37.9°C | 22.2°C | 61 mm | 76% | 1.3 m/s | 5.8 |
| 2020 | 36.6°C | 30.4°C | 24.1°C | 39.5°C | 21.1°C | 40 mm | 67% | 1.5 m/s | 6.4 |
| 2019 | 37.7°C | 31.6°C | 25.5°C | 41.4°C | 23.8°C | 45 mm | 66% | 1.5 m/s | 5.6 |
| 2018 | 36.2°C | 30.2°C | 24.2°C | 39.4°C | 20.8°C | 46 mm | 68% | 1.6 m/s | 6 |
| 2017 🌧️ | 33.3°C | 28.8°C | 24.2°C | 38.1°C | 20.2°C | 719 mm | 78% | 2.1 m/s | 5.1 |
| 2016 | 32.5°C | 28.3°C | 24.0°C | 37.4°C | 22.7°C | 205 mm | 81% | 1.3 m/s | 5.1 |
| 2015 | 35.6°C | 29.6°C | 23.5°C | 40.8°C | 19.3°C | 91 mm | 71% | 1.3 m/s | 6.1 |
| 2014 | 34.8°C | 29.3°C | 23.8°C | 38.0°C | 20.0°C | 64 mm | 72% | 1.5 m/s | 5.6 |
| 2013 | 36.4°C | 30.2°C | 24.0°C | 40.6°C | 19.9°C | 61 mm | 67% | 1.6 m/s | 6.1 |
| 2012 | 35.4°C | 29.6°C | 23.9°C | 38.0°C | 21.9°C | 73 mm | 71% | 1.6 m/s | 6.3 |
| 2011 | 40.7°C | 33.3°C | 25.9°C | 42.7°C | 23.1°C | 19 mm | 53% | 1.8 m/s | 6.8 |
| 2010 | 36.6°C | 30.5°C | 24.4°C | 39.5°C | 20.7°C | 52 mm | 68% | 1.4 m/s | 6.3 |
| 2009 | 35.8°C | 30.2°C | 24.5°C | 39.2°C | 22.4°C | 77 mm | 69% | 1.4 m/s | 6 |
| 2008 | 33.4°C | 28.6°C | 23.9°C | 38.6°C | 22.7°C | 175 mm | 76% | 1.4 m/s | 5.5 |
| 2007 | 32.1°C | 28.1°C | 24.0°C | 36.3°C | 22.0°C | 135 mm | 83% | 1.2 m/s | 5.7 |
| 2006 | 33.1°C | 28.4°C | 23.7°C | 36.0°C | 18.5°C | 70 mm | 79% | 1.2 m/s | 5.9 |
| 2005 | 34.6°C | 29.5°C | 24.3°C | 37.9°C | 22.6°C | 76 mm | 73% | 1.1 m/s | 5.8 |
| 2004 | 33.2°C | 27.9°C | 22.6°C | 36.5°C | 16.6°C | 74 mm | 74% | 1.5 m/s | 6 |
| 2003 | 34.6°C | 29.3°C | 24.1°C | 40.5°C | 21.1°C | 143 mm | 73% | 1.4 m/s | 5.7 |
| 2002 | 32.8°C | 28.2°C | 23.6°C | 36.6°C | 20.7°C | 157 mm | 79% | 1.4 m/s | 5.7 |
| 2001 | 34.5°C | 29.2°C | 24.0°C | 38.3°C | 22.4°C | 177 mm | 73% | 1.6 m/s | 5.4 |
| 2000 | 37.2°C | 30.6°C | 24.0°C | 43.6°C | 21.8°C | 30 mm | 62% | 1.5 m/s | 6.4 |
| 1999 | 37.4°C | 31.0°C | 24.6°C | 41.9°C | 19.8°C | 28 mm | 64% | 1.5 m/s | 6.4 |
| 1998 | 34.6°C | 29.6°C | 24.5°C | 42.2°C | 22.9°C | 147 mm | 73% | 1.3 m/s | 5.5 |
| 1997 | 35.3°C | 29.6°C | 23.8°C | 38.6°C | 19.9°C | 63 mm | 70% | 1.5 m/s | 6.3 |
| 1996 | 32.3°C | 28.0°C | 23.7°C | 39.2°C | 21.8°C | 227 mm | 78% | 1.5 m/s | 5.3 |
| 1995 | 33.3°C | 28.7°C | 24.2°C | 37.0°C | 21.8°C | 106 mm | 77% | 1.3 m/s | 5.8 |
| 1994 | 33.0°C | 28.1°C | 23.2°C | 36.1°C | 21.4°C | 160 mm | 76% | 1.4 m/s | 5.5 |
| 1993 | 35.9°C | 29.9°C | 24.0°C | 38.7°C | 23.0°C | 54 mm | 69% | 1.5 m/s | 6.1 |
| 1992 ❄️ | 31.9°C | 26.6°C | 21.3°C | 36.0°C | 15.8°C | 68 mm | 75% | 1.2 m/s | 6 |
| 1991 | 32.0°C | 27.5°C | 23.1°C | 34.7°C | 21.8°C | 91 mm | 80% | 1.1 m/s | 5.8 |
| 1990 | 35.9°C | 29.7°C | 23.5°C | 39.7°C | 19.9°C | 35 mm | 65% | 1.4 m/s | 6.1 |
| 1989 | 31.6°C | 26.9°C | 22.2°C | 34.7°C | 15.3°C | 80 mm | 80% | 1.5 m/s | 5.9 |
| 1988 | 35.4°C | 29.7°C | 24.0°C | 40.3°C | 22.2°C | 65 mm | 70% | 1.5 m/s | 5.9 |
| 1987 | 34.5°C | 29.1°C | 23.7°C | 38.0°C | 22.0°C | 68 mm | 73% | 1.5 m/s | 6.3 |
| 1986 | 34.7°C | 28.7°C | 22.7°C | 40.8°C | 15.3°C | 113 mm | 68% | 1.5 m/s | 5.7 |
| 1985 | 36.6°C | 30.1°C | 23.6°C | 39.2°C | 21.7°C | 65 mm | 66% | 1.6 m/s | 6.5 |
| 1984 | 34.5°C | 28.7°C | 23.0°C | 39.1°C | 21.4°C | 90 mm | 70% | 1.5 m/s | 5.7 |
| 1983 | 31.4°C | 27.3°C | 23.2°C | 34.4°C | 22.3°C | 242 mm | 83% | 1.3 m/s | — |
| 1982 | 36.4°C | 30.0°C | 23.7°C | 39.5°C | 21.3°C | 61 mm | 67% | 1.7 m/s | — |
| 1981 | 33.9°C | 28.6°C | 23.3°C | 36.2°C | 18.9°C | 184 mm | 73% | 1.4 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 34.9°C with lows near 23.9°C (mean 29.4°C), based on 45 years of NASA POWER data.
August averages 107 mm of rainfall in Houston, about average for rainfall. The wettest on record was 719 mm in 2017.
The hottest August reached 44.7°C in 2023. The coldest dipped to 15.3°C in 1986.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 2.1°C. Daytime highs moved from 34.6°C to 36.9°C and overnight lows from 23.4°C to 25.1°C over the same span.
August is one of the warmer months of the year in Houston and about average for rainfall, so plan for around 34.9°C daytime highs and 23.9°C at night.
Not quite — August is the 12th coolest month in Houston, averaging 29.4°C.
For August in Houston, pack light, breathable clothing and sun protection, with typical highs of 34.9°C and lows of 23.9°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 72% — moderately humid.
Average wind speed in August is 1.5 m/s. The windiest August on record averaged 2.1 m/s (2017).
The wettest August on record was 2017 with 719 mm. On average, August sees 107 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 Houston 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.
