August is one of the warmer months of the year in Fort Smith, with average highs near 34.5°C and lows around 21.7°C (mean 28.1°C). It is about average for rainfall, averaging 93 mm of rainfall and 63% relative humidity across the period.
August is one of the warmer months of the year in Fort Smith. Across 45 years of records, the warmest August in Fort Smith was 2000 — when the month averaged 31.6°C — while the coldest was 1992 at 24.4°C. Typical August days reach 34.5°C with nights near 21.7°C. The long-term August temperature trend is broadly flat.
August is about average for rainfall in Fort Smith, averaging 93 mm of rainfall. The wettest August on record was 2018 with 219 mm, while the driest was 2000 at 2 mm.
Relative humidity in Fort Smith during August averages 63%. The most humid August was 2017 at 77%, and the least humid was 2000 at 43%.
August receives about 5.9 kWh/m²/day of solar energy in Fort Smith. The sunniest August was 2000 at 6.7 kWh/m²/day, and the cloudiest were 1997 and 2008 at 5.3.
Average wind speed in Fort Smith during August is 1.4 m/s. The windiest August was 2012 at 1.7 m/s, while the calmest were 2005, 2013 and 2019, among others at 1.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 28.0°C | 27.9°C | 28.4°C | 27.9°C | 28.3°C | +0.3°C |
| Avg High | 34.6°C | 34.6°C | 34.8°C | 34.0°C | 34.7°C | +0.1°C |
| Avg Low | 21.4°C | 21.3°C | 22.1°C | 21.9°C | 22.0°C | +0.6°C |
| Avg Rain | 83 mm | 73 mm | 87 mm | 117 mm | 109 mm | +26 mm |
August temperatures in Fort Smith have risen by about 0.4°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 10.8°C (1986) to a record high of 46.5°C (2011).
Rainfall in August is about average for rainfall, averaging 93 mm, with a wettest year of 219 mm.
Daytime highs and overnight lows have shifted differently — highs fell about 0.2°C per decade while lows rose 0.2°C per decade, narrowing the gap between day and night.
A good time to visit Fort Smith
August is a good time to visit Fort Smith, with days averaging 34.5°C and nights around 21.7°C (mean 28.1°C, warmer than Fort Smith's yearly average) and higher rainfall. September and June are marginally more temperate, but August still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 34.5°C | 28.1°C | 21.7°C | 39.9°C | 17.0°C | 107 mm | 63% | 1.3 m/s | 5.5 |
| 2024 | 35.1°C | 28.4°C | 21.8°C | 40.4°C | 16.0°C | 135 mm | 61% | 1.3 m/s | 6.1 |
| 2023 | 37.1°C | 30.0°C | 22.9°C | 42.7°C | 15.7°C | 79 mm | 60% | 1.4 m/s | 6.3 |
| 2022 | 34.9°C | 28.7°C | 22.4°C | 40.0°C | 19.0°C | 84 mm | 65% | 1.4 m/s | 5.9 |
| 2021 | 34.3°C | 28.5°C | 22.7°C | 38.5°C | 19.8°C | 56 mm | 68% | 1.4 m/s | 5.9 |
| 2020 | 32.2°C | 26.3°C | 20.4°C | 36.0°C | 15.6°C | 193 mm | 70% | 1.4 m/s | 6.1 |
| 2019 | 32.5°C | 27.5°C | 22.5°C | 37.5°C | 17.9°C | 199 mm | 76% | 1.2 m/s | 5.4 |
| 2018 🌧️ | 31.5°C | 26.4°C | 21.4°C | 36.3°C | 16.8°C | 219 mm | 76% | 1.4 m/s | 5.6 |
| 2017 | 30.4°C | 25.4°C | 20.4°C | 33.7°C | 16.0°C | 201 mm | 77% | 1.4 m/s | 5.4 |
| 2016 | 33.0°C | 27.7°C | 22.4°C | 38.7°C | 15.1°C | 89 mm | 72% | 1.3 m/s | 5.4 |
| 2015 | 32.2°C | 26.0°C | 19.9°C | 37.3°C | 12.6°C | 103 mm | 69% | 1.3 m/s | 5.9 |
| 2014 | 34.5°C | 27.8°C | 21.1°C | 38.9°C | 15.2°C | 55 mm | 65% | 1.3 m/s | 6.3 |
| 2013 | 33.1°C | 27.1°C | 21.1°C | 38.9°C | 14.1°C | 93 mm | 69% | 1.2 m/s | 6.1 |
| 2012 | 35.8°C | 28.7°C | 21.6°C | 42.7°C | 16.8°C | 73 mm | 53% | 1.7 m/s | 6 |
| 2011 | 38.5°C | 31.5°C | 24.5°C | 46.5°C | 19.7°C | 105 mm | 55% | 1.5 m/s | 5.9 |
| 2010 | 38.0°C | 31.0°C | 24.0°C | 41.5°C | 16.7°C | 37 mm | 55% | 1.6 m/s | 6.4 |
| 2009 | 32.3°C | 26.0°C | 19.8°C | 37.9°C | 12.2°C | 118 mm | 70% | 1.5 m/s | 6.1 |
| 2008 | 31.9°C | 26.5°C | 21.1°C | 41.7°C | 17.3°C | 166 mm | 71% | 1.4 m/s | 5.3 |
| 2007 | 35.8°C | 29.7°C | 23.6°C | 41.5°C | 19.5°C | 66 mm | 64% | 1.4 m/s | 6.2 |
| 2006 | 35.5°C | 29.5°C | 23.4°C | 41.3°C | 16.1°C | 98 mm | 62% | 1.4 m/s | 5.8 |
| 2005 | 35.5°C | 29.2°C | 23.0°C | 39.1°C | 19.0°C | 93 mm | 61% | 1.2 m/s | 5.9 |
| 2004 | 30.9°C | 24.6°C | 18.3°C | 36.5°C | 11.7°C | 40 mm | 69% | 1.5 m/s | 6.1 |
| 2003 | 36.3°C | 29.7°C | 23.0°C | 40.8°C | 18.6°C | 108 mm | 58% | 1.3 m/s | 5.7 |
| 2002 | 34.7°C | 28.3°C | 21.9°C | 38.7°C | 18.5°C | 98 mm | 63% | 1.4 m/s | 5.9 |
| 2001 | 35.8°C | 29.2°C | 22.7°C | 40.7°C | 18.3°C | 79 mm | 58% | 1.3 m/s | 5.9 |
| 2000 🔥 | 39.4°C | 31.6°C | 23.7°C | 42.0°C | 19.2°C | 2 mm | 43% | 1.4 m/s | 6.7 |
| 1999 | 38.4°C | 30.3°C | 22.1°C | 42.0°C | 17.7°C | 20 mm | 44% | 1.5 m/s | 6.6 |
| 1998 | 37.1°C | 30.2°C | 23.3°C | 42.1°C | 20.1°C | 46 mm | 53% | 1.3 m/s | 5.8 |
| 1997 | 32.8°C | 26.6°C | 20.5°C | 37.6°C | 15.5°C | 116 mm | 65% | 1.4 m/s | 5.3 |
| 1996 | 31.8°C | 26.3°C | 20.8°C | 35.0°C | 17.4°C | 108 mm | 70% | 1.2 m/s | 5.6 |
| 1995 | 37.1°C | 30.2°C | 23.2°C | 40.3°C | 16.9°C | 25 mm | 56% | 1.3 m/s | 6.3 |
| 1994 | 33.1°C | 26.3°C | 19.5°C | 36.5°C | 14.4°C | 114 mm | 65% | 1.2 m/s | 6.1 |
| 1993 | 36.0°C | 29.5°C | 22.9°C | 41.0°C | 16.1°C | 82 mm | 61% | 1.3 m/s | 5.9 |
| 1992 ❄️ | 30.7°C | 24.4°C | 18.1°C | 34.4°C | 12.2°C | 66 mm | 69% | 1.3 m/s | 5.5 |
| 1991 | 34.0°C | 27.4°C | 20.7°C | 39.2°C | 14.4°C | 86 mm | 61% | 1.3 m/s | 5.7 |
| 1990 | 35.0°C | 28.2°C | 21.5°C | 39.9°C | 15.3°C | 69 mm | 62% | 1.2 m/s | 5.9 |
| 1989 | 33.7°C | 27.3°C | 20.9°C | 37.0°C | 12.5°C | 51 mm | 65% | 1.3 m/s | 5.9 |
| 1988 | 34.9°C | 28.4°C | 21.9°C | 39.6°C | 11.9°C | 68 mm | 63% | 1.4 m/s | 5.5 |
| 1987 | 36.1°C | 29.6°C | 23.1°C | 40.6°C | 14.6°C | 120 mm | 59% | 1.5 m/s | 5.9 |
| 1986 | 31.9°C | 25.6°C | 19.2°C | 35.9°C | 10.8°C | 144 mm | 65% | 1.4 m/s | 5.6 |
| 1985 | 35.3°C | 28.3°C | 21.3°C | 39.7°C | 15.0°C | 96 mm | 61% | 1.4 m/s | 6 |
| 1984 | 34.1°C | 27.5°C | 20.9°C | 39.9°C | 16.6°C | 78 mm | 62% | 1.3 m/s | 5.5 |
| 1983 | 37.2°C | 30.4°C | 23.5°C | 40.5°C | 20.8°C | 46 mm | 55% | 1.2 m/s | — |
| 1982 | 36.2°C | 29.3°C | 22.4°C | 39.7°C | 19.1°C | 52 mm | 61% | 1.5 m/s | — |
| 1981 | 31.8°C | 25.8°C | 19.8°C | 35.2°C | 14.4°C | 95 mm | 69% | 1.3 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 34.5°C with lows near 21.7°C (mean 28.1°C), based on 45 years of NASA POWER data.
August averages 93 mm of rainfall in Fort Smith, about average for rainfall. The wettest on record was 219 mm in 2018.
The hottest August reached 46.5°C in 2011. The coldest dipped to 10.8°C in 1986.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 0.4°C. Daytime highs moved from 34.9°C to 35.2°C and overnight lows from 21.6°C to 22.3°C over the same span.
August is one of the warmer months of the year in Fort Smith and about average for rainfall, so plan for around 34.5°C daytime highs and 21.7°C at night.
Not quite — August is the 11th coolest month in Fort Smith, averaging 28.1°C.
For August in Fort Smith, pack light, breathable clothing and sun protection, with typical highs of 34.5°C and lows of 21.7°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 63% — moderately humid.
Average wind speed in August is 1.4 m/s. The windiest August on record averaged 1.7 m/s (2012).
The wettest August on record was 2018 with 219 mm. On average, August sees 93 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 Fort Smith 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.
