August is one of the warmer months of the year in Decatur, with average highs near 32.6°C and lows around 20.8°C (mean 26.7°C). It is one of the drier months, averaging 96 mm of rainfall and 69% relative humidity across the period.
August is one of the warmer months of the year in Decatur. Across 45 years of records, the warmest August in Decatur was 2007 — when the month averaged 30.1°C — while the coldest was 1992 at 24°C. Typical August days reach 32.6°C with nights near 20.8°C. The long-term August temperature trend is broadly flat.
August is one of the drier months in Decatur, averaging 96 mm of rainfall. The wettest August on record was 2021 with 188 mm, while the driest was 1999 at 17 mm.
Relative humidity in Decatur during August averages 69%. The most humid August was 2013 at 82%, and the least humid was 1999 at 50%.
August receives about 5.6 kWh/m²/day of solar energy in Decatur. The sunniest August was 2024 at 6.5 kWh/m²/day, and the cloudiest was 1992 at 4.9.
Average wind speed in Decatur during August is 0.8 m/s. The windiest Augusts were 1995, 1999 and 2000, among others at 1 m/s, while the calmest were 2013, 2019 and 2025, among others at 0.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 26.4°C | 26.5°C | 27.1°C | 26.7°C | 26.6°C | +0.2°C |
| Avg High | 32.2°C | 32.6°C | 33.2°C | 32.3°C | 32.4°C | +0.2°C |
| Avg Low | 20.5°C | 20.4°C | 21.1°C | 21.0°C | 20.8°C | +0.3°C |
| Avg Rain | 101 mm | 75 mm | 87 mm | 108 mm | 121 mm | +20 mm |
August temperatures in Decatur have risen by about 0.4°C between 1981–1985 and 2021–2025.
August has ranged from a record low of 11°C (1986) to a record high of 41.4°C (2007).
Rainfall in August is one of the drier months, averaging 96 mm, with a wettest year of 188 mm.
One of the best times to visit Decatur
August is one of the best times to visit Decatur. Expect days averaging 32.6°C and nights around 20.8°C (mean 26.7°C) — warmer than Decatur's yearly average — with higher rainfall (96 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 32.4°C | 26.2°C | 20.0°C | 37.2°C | 12.9°C | 74 mm | 66% | 0.7 m/s | 5.4 |
| 2024 | 35.0°C | 27.8°C | 20.5°C | 39.0°C | 15.2°C | 26 mm | 57% | 0.9 m/s | 6.5 |
| 2023 | 32.6°C | 26.9°C | 21.2°C | 36.8°C | 16.4°C | 174 mm | 73% | 0.8 m/s | 5.7 |
| 2022 | 32.0°C | 26.6°C | 21.1°C | 36.4°C | 17.9°C | 101 mm | 72% | 0.8 m/s | 5.3 |
| 2021 🌧️ | 30.3°C | 25.6°C | 20.8°C | 34.0°C | 16.8°C | 188 mm | 79% | 0.8 m/s | 5.3 |
| 2020 | 32.0°C | 26.5°C | 21.1°C | 36.0°C | 18.1°C | 164 mm | 73% | 0.8 m/s | 5.6 |
| 2019 | 33.0°C | 27.1°C | 21.3°C | 37.1°C | 15.7°C | 110 mm | 69% | 0.7 m/s | 6.1 |
| 2018 | 32.5°C | 26.9°C | 21.3°C | 35.7°C | 16.7°C | 69 mm | 70% | 0.8 m/s | 5.8 |
| 2017 | 30.9°C | 25.5°C | 20.2°C | 34.9°C | 15.8°C | 136 mm | 74% | 0.8 m/s | 5.4 |
| 2016 | 33.3°C | 27.9°C | 22.5°C | 36.4°C | 19.4°C | 105 mm | 72% | 0.8 m/s | 5.6 |
| 2015 | 30.7°C | 25.3°C | 19.8°C | 36.8°C | 13.0°C | 180 mm | 74% | 0.9 m/s | 5.5 |
| 2014 | 32.4°C | 26.4°C | 20.5°C | 36.9°C | 15.7°C | 117 mm | 68% | 0.8 m/s | 5.9 |
| 2013 | 29.3°C | 24.7°C | 20.0°C | 33.4°C | 14.5°C | 103 mm | 82% | 0.7 m/s | 5.1 |
| 2012 | 31.6°C | 25.8°C | 20.0°C | 36.7°C | 14.6°C | 94 mm | 70% | 0.9 m/s | 5.6 |
| 2011 | 34.5°C | 28.0°C | 21.5°C | 38.5°C | 17.2°C | 67 mm | 63% | 0.8 m/s | 6.1 |
| 2010 | 34.9°C | 29.0°C | 23.0°C | 40.1°C | 18.9°C | 99 mm | 68% | 0.8 m/s | 5.8 |
| 2009 | 30.7°C | 25.3°C | 19.9°C | 34.4°C | 14.4°C | 98 mm | 74% | 0.9 m/s | 5.5 |
| 2008 | 32.1°C | 26.2°C | 20.2°C | 37.2°C | 15.8°C | 142 mm | 66% | 0.9 m/s | 5.4 |
| 2007 🔥 | 36.7°C | 30.1°C | 23.5°C | 41.4°C | 20.8°C | 60 mm | 58% | 0.8 m/s | 6 |
| 2006 | 35.4°C | 29.1°C | 22.7°C | 38.5°C | 18.3°C | 64 mm | 64% | 0.8 m/s | 5.8 |
| 2005 | 33.9°C | 28.1°C | 22.2°C | 37.6°C | 18.9°C | 97 mm | 69% | 0.9 m/s | 5.4 |
| 2004 | 30.7°C | 24.5°C | 18.3°C | 34.7°C | 11.6°C | 80 mm | 69% | 0.9 m/s | 5.5 |
| 2003 | 31.4°C | 26.3°C | 21.3°C | 34.7°C | 18.8°C | 100 mm | 78% | 0.7 m/s | 5.6 |
| 2002 | 33.8°C | 27.4°C | 21.0°C | 37.3°C | 18.5°C | 66 mm | 64% | 0.8 m/s | 5.8 |
| 2001 | 31.4°C | 25.9°C | 20.3°C | 35.3°C | 15.2°C | 122 mm | 72% | 0.8 m/s | 5.1 |
| 2000 | 35.5°C | 28.6°C | 21.6°C | 40.6°C | 16.6°C | 42 mm | 53% | 1 m/s | 5.8 |
| 1999 | 35.8°C | 28.3°C | 20.8°C | 39.7°C | 16.8°C | 17 mm | 50% | 1 m/s | 6.3 |
| 1998 | 33.4°C | 27.0°C | 20.6°C | 37.3°C | 17.2°C | 75 mm | 64% | 0.8 m/s | 5.7 |
| 1997 | 30.6°C | 24.9°C | 19.3°C | 33.3°C | 13.1°C | 78 mm | 73% | 0.9 m/s | 5.6 |
| 1996 | 31.8°C | 25.7°C | 19.6°C | 34.4°C | 16.7°C | 74 mm | 69% | 0.7 m/s | 5.6 |
| 1995 | 35.0°C | 28.8°C | 22.7°C | 38.7°C | 19.9°C | 87 mm | 66% | 1 m/s | 5.4 |
| 1994 | 30.5°C | 25.0°C | 19.4°C | 34.9°C | 15.8°C | 73 mm | 74% | 0.7 m/s | 5.5 |
| 1993 | 33.3°C | 27.5°C | 21.7°C | 36.5°C | 18.0°C | 107 mm | 69% | 0.7 m/s | 5.4 |
| 1992 ❄️ | 29.3°C | 24.0°C | 18.7°C | 33.6°C | 11.9°C | 114 mm | 72% | 0.8 m/s | 4.9 |
| 1991 | 31.1°C | 25.7°C | 20.2°C | 35.4°C | 14.9°C | 83 mm | 73% | 0.8 m/s | 5.5 |
| 1990 | 35.3°C | 28.2°C | 21.0°C | 39.6°C | 16.1°C | 37 mm | 56% | 0.8 m/s | 5.7 |
| 1989 | 29.5°C | 24.6°C | 19.6°C | 32.3°C | 11.4°C | 92 mm | 79% | 0.7 m/s | 5.6 |
| 1988 | 34.5°C | 28.0°C | 21.4°C | 38.1°C | 15.1°C | 69 mm | 63% | 0.8 m/s | 5.6 |
| 1987 | 35.0°C | 28.5°C | 22.0°C | 38.0°C | 17.3°C | 65 mm | 60% | 0.8 m/s | 5.5 |
| 1986 | 31.7°C | 25.7°C | 19.6°C | 37.2°C | 11.0°C | 144 mm | 68% | 1 m/s | 5.2 |
| 1985 | 29.4°C | 24.6°C | 19.7°C | 32.8°C | 15.9°C | 152 mm | 78% | 0.9 m/s | 5.1 |
| 1984 | 30.9°C | 25.5°C | 20.0°C | 35.1°C | 15.2°C | 82 mm | 75% | 0.9 m/s | 5 |
| 1983 | 35.0°C | 28.5°C | 22.0°C | 39.8°C | 17.6°C | 55 mm | 62% | 0.7 m/s | — |
| 1982 | 31.6°C | 25.9°C | 20.3°C | 35.2°C | 16.7°C | 93 mm | 72% | 0.8 m/s | — |
| 1981 | 32.6°C | 26.5°C | 20.3°C | 37.4°C | 17.3°C | 160 mm | 68% | 0.8 m/s | — |
Actual recorded August data for each year, 1981–2025 — sourced from NASA POWER.
The average high in August is around 32.6°C with lows near 20.8°C (mean 26.7°C), based on 45 years of NASA POWER data.
August averages 96 mm of rainfall in Decatur, one of the drier months. The wettest on record was 188 mm in 2021.
The hottest August reached 41.4°C in 2007. The coldest dipped to 11°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 31.9°C to 32.5°C and overnight lows from 20.5°C to 20.7°C over the same span.
August is one of the warmer months of the year in Decatur and one of the drier months, so plan for around 32.6°C daytime highs and 20.8°C at night.
Not quite — August is the 11th coolest month in Decatur, averaging 26.7°C.
For August in Decatur, pack light, breathable clothing and sun protection, with typical highs of 32.6°C and lows of 20.8°C. Bring an umbrella or light rain jacket too.
Relative humidity in August averages 69% — moderately humid.
Average wind speed in August is 0.8 m/s. The windiest August on record averaged 1 m/s (1986).
The wettest August on record was 2021 with 188 mm. On average, August sees 96 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 Decatur 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.
