August is one of the warmer months of the year in Stillwater, with average highs near 34.6°C and lows around 22.2°C (mean 28.4°C). It is about average for rainfall, averaging 86 mm of rainfall and 60% relative humidity across the period.
August is one of the warmer months of the year in Stillwater. Across 45 years of records, the warmest August in Stillwater was 2011 — when the month averaged 33.2°C — while the coldest was 1992 at 23.4°C. Typical August days reach 34.6°C with nights near 22.2°C. The long-term August temperature trend is broadly flat.
August is about average for rainfall in Stillwater, averaging 86 mm of rainfall. The wettest August on record was 2019 with 252 mm, while the driest was 2000 at 2 mm.
Relative humidity in Stillwater during August averages 60%. The most humid August was 2007 at 80%, and the least humid was 2000 at 39%.
August receives about 6.1 kWh/m²/day of solar energy in Stillwater. The sunniest August was 2000 at 6.8 kWh/m²/day, and the cloudiest were 1996 and 2008 at 5.4.
Average wind speed in Stillwater during August is 2.7 m/s. The windiest August was 2000 at 3.4 m/s, while the calmest were 1992, 1996 and 2005 at 2.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 28.3°C | 27.7°C | 28.6°C | 28.4°C | 29.0°C | +0.7°C |
| Avg High | 34.6°C | 34.0°C | 34.7°C | 34.5°C | 35.4°C | +0.8°C |
| Avg Low | 22.0°C | 21.5°C | 22.6°C | 22.3°C | 22.5°C | +0.5°C |
| Avg Rain | 68 mm | 86 mm | 95 mm | 100 mm | 72 mm | +4 mm |
August temperatures in Stillwater have risen by about 0.3°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 12°C (2009) to a record high of 47.1°C (2012).
Rainfall in August is about average for rainfall, averaging 86 mm, with a wettest year of 252 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0°C per decade while lows rose 0.2°C per decade, narrowing the gap between day and night.
A good time to visit Stillwater
August is a good time to visit Stillwater, with days averaging 34.6°C and nights around 22.2°C (mean 28.4°C, warmer than Stillwater's yearly average) and higher rainfall. September and May 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 | 32.8°C | 27.1°C | 21.5°C | 38.4°C | 16.9°C | 87 mm | 68% | 2.5 m/s | 5.6 |
| 2024 | 37.0°C | 30.1°C | 23.2°C | 42.2°C | 18.7°C | 90 mm | 54% | 2.8 m/s | 6.2 |
| 2023 | 37.0°C | 30.0°C | 22.9°C | 42.6°C | 16.4°C | 101 mm | 54% | 2.4 m/s | 6.6 |
| 2022 | 36.7°C | 30.2°C | 23.6°C | 41.5°C | 20.2°C | 40 mm | 53% | 2.6 m/s | 6.4 |
| 2021 | 34.3°C | 28.5°C | 22.7°C | 38.9°C | 17.5°C | 59 mm | 66% | 2.9 m/s | 6.2 |
| 2020 | 34.5°C | 27.8°C | 21.2°C | 40.3°C | 16.3°C | 55 mm | 62% | 2.5 m/s | 6.2 |
| 2019 🌧️ | 32.2°C | 27.4°C | 22.7°C | 37.3°C | 16.7°C | 252 mm | 77% | 2.4 m/s | 5.6 |
| 2018 | 33.1°C | 27.5°C | 21.9°C | 37.5°C | 17.7°C | 114 mm | 66% | 2.8 m/s | 5.8 |
| 2017 | 31.2°C | 25.7°C | 20.3°C | 35.9°C | 15.6°C | 160 mm | 71% | 2.4 m/s | 5.7 |
| 2016 | 33.9°C | 28.3°C | 22.6°C | 39.5°C | 15.6°C | 53 mm | 64% | 2.6 m/s | 6 |
| 2015 | 32.1°C | 26.3°C | 20.5°C | 38.3°C | 13.2°C | 78 mm | 66% | 2.5 m/s | 6.1 |
| 2014 | 35.5°C | 28.8°C | 22.1°C | 39.7°C | 16.4°C | 34 mm | 56% | 2.7 m/s | 6.7 |
| 2013 | 33.3°C | 27.4°C | 21.5°C | 40.3°C | 15.7°C | 98 mm | 66% | 2.5 m/s | 6.2 |
| 2012 | 36.7°C | 29.5°C | 22.3°C | 47.1°C | 15.8°C | 68 mm | 44% | 2.9 m/s | 6.3 |
| 2011 🔥 | 40.6°C | 33.2°C | 25.7°C | 46.0°C | 19.5°C | 70 mm | 44% | 2.9 m/s | 6.2 |
| 2010 | 36.8°C | 30.2°C | 23.6°C | 42.2°C | 14.2°C | 68 mm | 54% | 2.8 m/s | 6.7 |
| 2009 | 32.4°C | 26.5°C | 20.6°C | 39.0°C | 12.0°C | 154 mm | 66% | 2.9 m/s | 6.4 |
| 2008 | 32.9°C | 27.2°C | 21.6°C | 40.9°C | 17.2°C | 71 mm | 67% | 2.4 m/s | 5.4 |
| 2007 | 31.6°C | 27.0°C | 22.4°C | 35.4°C | 17.8°C | 94 mm | 80% | 2.8 m/s | 6.4 |
| 2006 | 36.3°C | 30.4°C | 24.5°C | 42.8°C | 17.4°C | 89 mm | 54% | 2.7 m/s | 6.1 |
| 2005 | 33.9°C | 28.3°C | 22.7°C | 39.3°C | 18.9°C | 174 mm | 65% | 2.3 m/s | 5.9 |
| 2004 | 31.5°C | 25.5°C | 19.4°C | 37.7°C | 14.2°C | 77 mm | 64% | 2.7 m/s | 6.2 |
| 2003 | 36.7°C | 30.3°C | 23.9°C | 40.9°C | 20.4°C | 135 mm | 52% | 2.4 m/s | 5.9 |
| 2002 | 34.9°C | 28.7°C | 22.4°C | 38.9°C | 14.7°C | 104 mm | 58% | 2.8 m/s | 6.1 |
| 2001 | 37.0°C | 30.3°C | 23.7°C | 41.2°C | 19.0°C | 52 mm | 50% | 2.6 m/s | 6.4 |
| 2000 | 39.6°C | 32.2°C | 24.8°C | 41.8°C | 19.7°C | 2 mm | 39% | 3.4 m/s | 6.8 |
| 1999 | 36.9°C | 29.7°C | 22.5°C | 41.8°C | 17.2°C | 31 mm | 51% | 2.7 m/s | 6.5 |
| 1998 | 37.9°C | 31.1°C | 24.3°C | 41.9°C | 20.2°C | 27 mm | 45% | 2.5 m/s | 6.3 |
| 1997 | 32.0°C | 26.2°C | 20.5°C | 36.2°C | 15.2°C | 133 mm | 67% | 2.6 m/s | 5.9 |
| 1996 | 31.4°C | 26.2°C | 21.0°C | 35.2°C | 17.0°C | 120 mm | 69% | 2.3 m/s | 5.4 |
| 1995 | 33.9°C | 28.1°C | 22.4°C | 37.9°C | 18.0°C | 80 mm | 67% | 2.4 m/s | 6.2 |
| 1994 | 34.5°C | 27.4°C | 20.4°C | 39.3°C | 14.1°C | 120 mm | 56% | 3 m/s | 6.2 |
| 1993 | 34.3°C | 28.3°C | 22.3°C | 38.7°C | 14.8°C | 76 mm | 61% | 2.8 m/s | 5.8 |
| 1992 ❄️ | 28.7°C | 23.4°C | 18.1°C | 33.4°C | 12.7°C | 160 mm | 75% | 2.3 m/s | 5.5 |
| 1991 | 34.8°C | 28.3°C | 21.8°C | 40.3°C | 16.8°C | 50 mm | 52% | 2.4 m/s | 6.2 |
| 1990 | 35.1°C | 28.4°C | 21.7°C | 41.1°C | 15.4°C | 66 mm | 58% | 2.6 m/s | 6.3 |
| 1989 | 32.2°C | 26.6°C | 21.0°C | 37.1°C | 12.6°C | 126 mm | 66% | 2.9 m/s | 5.5 |
| 1988 | 36.0°C | 29.3°C | 22.7°C | 40.5°C | 12.2°C | 38 mm | 52% | 2.8 m/s | 6.1 |
| 1987 | 33.8°C | 27.8°C | 21.7°C | 37.6°C | 14.8°C | 78 mm | 62% | 2.8 m/s | 6.2 |
| 1986 | 32.3°C | 26.4°C | 20.5°C | 39.6°C | 13.4°C | 111 mm | 60% | 2.6 m/s | 5.8 |
| 1985 | 34.6°C | 28.0°C | 21.3°C | 38.9°C | 15.3°C | 50 mm | 60% | 2.7 m/s | 6 |
| 1984 | 35.8°C | 29.1°C | 22.3°C | 43.3°C | 17.8°C | 56 mm | 50% | 2.5 m/s | 6 |
| 1983 | 37.6°C | 31.2°C | 24.8°C | 41.2°C | 22.6°C | 39 mm | 50% | 2.5 m/s | — |
| 1982 | 36.2°C | 29.6°C | 23.0°C | 40.9°C | 20.3°C | 18 mm | 57% | 3.1 m/s | — |
| 1981 | 32.8°C | 26.7°C | 20.5°C | 36.8°C | 14.4°C | 96 mm | 61% | 2.8 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 34.6°C with lows near 22.2°C (mean 28.4°C), based on 45 years of NASA POWER data.
August averages 86 mm of rainfall in Stillwater, about average for rainfall. The wettest on record was 252 mm in 2019.
The hottest August reached 47.1°C in 2012. The coldest dipped to 12°C in 2009.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average August temperatures have risen by about 0.3°C. Daytime highs moved from 35.4°C to 35.6°C and overnight lows from 22.4°C to 22.8°C over the same span.
August is one of the warmer months of the year in Stillwater and about average for rainfall, so plan for around 34.6°C daytime highs and 22.2°C at night.
Not quite — August is the 11th coolest month in Stillwater, averaging 28.4°C.
For August in Stillwater, pack light, breathable clothing and sun protection, with typical highs of 34.6°C and lows of 22.2°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 60% — moderately humid.
Average wind speed in August is 2.7 m/s. The windiest August on record averaged 3.4 m/s (2000).
The wettest August on record was 2019 with 252 mm. On average, August sees 86 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 Stillwater 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.
