July is one of the warmer months of the year in Decatur, with average highs near 33.1°C and lows around 21.3°C (mean 27.2°C). It is a relatively wet time of year, averaging 121 mm of rainfall and 70% relative humidity across the period.
July is one of the warmer months of the year in Decatur. Across 45 years of records, the warmest July in Decatur was 1986 — when the month averaged 29.7°C — while the coldest was 1994 at 24.2°C. Typical July days reach 33.1°C with nights near 21.3°C. The long-term trend is warming, about 0.2°C per decade.
July is a relatively wet time of year in Decatur, averaging 121 mm of rainfall. The wettest July on record was 1994 with 321 mm, while the driest was 1993 at 43 mm.
Relative humidity in Decatur during July averages 70%. The most humid July was 1989 at 85%, and the least humid was 1986 at 53%.
July receives about 5.9 kWh/m²/day of solar energy in Decatur. The sunniest Julys were 1993 and 2010 at 6.6 kWh/m²/day, and the cloudiest was 2013 at 5.
Average wind speed in Decatur during July is 1 m/s. The windiest July was 1996 at 1.3 m/s, while the calmest were 2021, 2022 and 2024, among others at 0.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 26.8°C | 27.1°C | 26.8°C | 27.4°C | 28.0°C | +1.2°C |
| Avg High | 32.7°C | 32.8°C | 32.8°C | 33.2°C | 34.2°C | +1.5°C |
| Avg Low | 20.9°C | 21.3°C | 20.9°C | 21.6°C | 21.8°C | +0.9°C |
| Avg Rain | 126 mm | 122 mm | 125 mm | 111 mm | 118 mm | -8 mm |
July temperatures in Decatur have risen by about 1.4°C between 1981–1985 and 2021–2025.
July has ranged from a record low of 14.1°C (2014) to a record high of 41.7°C (2012).
Rainfall in July is a relatively wet time of year, averaging 121 mm, with a wettest year of 321 mm.
A good time to visit Decatur
July is a good time to visit Decatur, with days averaging 33.1°C and nights around 21.3°C (mean 27.2°C, warmer than Decatur's yearly average) and higher rainfall. May and September are marginally more temperate, but July still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 35.5°C | 29.0°C | 22.4°C | 38.9°C | 19.7°C | 88 mm | 65% | 1 m/s | 6.5 |
| 2024 | 34.4°C | 28.3°C | 22.3°C | 39.4°C | 19.3°C | 204 mm | 69% | 0.9 m/s | 5.6 |
| 2023 | 34.5°C | 28.0°C | 21.5°C | 37.9°C | 18.1°C | 84 mm | 67% | 1 m/s | 6.3 |
| 2022 | 34.7°C | 28.3°C | 21.9°C | 37.1°C | 18.4°C | 123 mm | 69% | 0.9 m/s | 5.9 |
| 2021 | 32.1°C | 26.4°C | 20.7°C | 36.9°C | 15.9°C | 134 mm | 74% | 0.9 m/s | 5.8 |
| 2020 | 34.2°C | 28.1°C | 21.9°C | 38.2°C | 19.1°C | 76 mm | 68% | 0.9 m/s | 6.3 |
| 2019 | 34.3°C | 27.9°C | 21.6°C | 36.9°C | 16.7°C | 76 mm | 65% | 1 m/s | 6.2 |
| 2018 | 32.0°C | 26.6°C | 21.2°C | 35.8°C | 17.8°C | 137 mm | 75% | 0.9 m/s | 6.2 |
| 2017 | 32.7°C | 27.0°C | 21.4°C | 36.5°C | 15.7°C | 104 mm | 74% | 0.9 m/s | 6.5 |
| 2016 | 35.6°C | 29.1°C | 22.7°C | 38.6°C | 20.6°C | 69 mm | 63% | 1 m/s | 6.3 |
| 2015 | 33.6°C | 27.7°C | 21.9°C | 37.0°C | 19.3°C | 95 mm | 71% | 1 m/s | 6.3 |
| 2014 | 31.9°C | 25.9°C | 19.8°C | 35.5°C | 14.1°C | 99 mm | 70% | 1 m/s | 6.1 |
| 2013 | 28.9°C | 24.7°C | 20.5°C | 31.5°C | 15.9°C | 218 mm | 85% | 1 m/s | 5 |
| 2012 | 34.6°C | 28.5°C | 22.4°C | 41.7°C | 19.1°C | 113 mm | 68% | 0.9 m/s | 6.3 |
| 2011 | 34.3°C | 28.5°C | 22.6°C | 37.3°C | 18.9°C | 92 mm | 69% | 0.9 m/s | 6 |
| 2010 | 34.4°C | 28.2°C | 22.1°C | 38.6°C | 15.8°C | 109 mm | 69% | 0.9 m/s | 6.6 |
| 2009 | 31.9°C | 25.9°C | 19.9°C | 34.9°C | 14.6°C | 92 mm | 69% | 1.1 m/s | 6.1 |
| 2008 | 33.6°C | 27.0°C | 20.5°C | 37.1°C | 15.6°C | 112 mm | 64% | 0.9 m/s | 6.2 |
| 2007 | 31.9°C | 26.1°C | 20.3°C | 34.3°C | 17.6°C | 124 mm | 70% | 1 m/s | 5.2 |
| 2006 | 35.5°C | 28.6°C | 21.7°C | 38.3°C | 16.3°C | 61 mm | 59% | 1 m/s | 5.9 |
| 2005 | 30.8°C | 26.3°C | 21.8°C | 35.4°C | 19.0°C | 294 mm | 81% | 1 m/s | 5.2 |
| 2004 | 32.6°C | 26.7°C | 20.9°C | 37.0°C | 17.7°C | 86 mm | 71% | 1 m/s | 6.2 |
| 2003 | 29.7°C | 25.2°C | 20.6°C | 31.9°C | 17.3°C | 198 mm | 83% | 1 m/s | 5.8 |
| 2002 | 33.9°C | 27.6°C | 21.4°C | 37.6°C | 20.2°C | 99 mm | 69% | 1 m/s | 6 |
| 2001 | 32.3°C | 26.3°C | 20.4°C | 34.6°C | 16.7°C | 105 mm | 70% | 1 m/s | 5.9 |
| 2000 | 35.7°C | 28.6°C | 21.5°C | 39.7°C | 18.1°C | 76 mm | 55% | 1.2 m/s | 6.2 |
| 1999 | 33.3°C | 27.1°C | 20.9°C | 40.0°C | 16.4°C | 79 mm | 72% | 0.9 m/s | 5.9 |
| 1998 | 33.9°C | 28.1°C | 22.3°C | 37.6°C | 20.2°C | 90 mm | 69% | 1.2 m/s | 5.9 |
| 1997 | 32.4°C | 26.7°C | 21.0°C | 35.2°C | 16.5°C | 126 mm | 74% | 1.1 m/s | 6.2 |
| 1996 | 33.7°C | 27.2°C | 20.8°C | 37.4°C | 16.3°C | 91 mm | 66% | 1.3 m/s | 5.6 |
| 1995 | 34.9°C | 28.3°C | 21.6°C | 38.3°C | 17.9°C | 47 mm | 63% | 1 m/s | 6.3 |
| 1994 ❄️ 🌧️ | 28.4°C | 24.2°C | 19.9°C | 31.4°C | 15.8°C | 321 mm | 85% | 1.2 m/s | 5.1 |
| 1993 | 36.4°C | 29.4°C | 22.5°C | 39.1°C | 17.9°C | 43 mm | 61% | 0.9 m/s | 6.6 |
| 1992 | 31.9°C | 26.7°C | 21.5°C | 36.8°C | 19.1°C | 142 mm | 74% | 1.1 m/s | 5.7 |
| 1991 | 30.0°C | 25.8°C | 21.6°C | 32.8°C | 19.9°C | 164 mm | 83% | 1 m/s | 5.7 |
| 1990 | 33.1°C | 27.0°C | 21.0°C | 37.2°C | 17.6°C | 118 mm | 67% | 1.1 m/s | 6.1 |
| 1989 | 28.7°C | 24.7°C | 20.6°C | 31.7°C | 17.7°C | 207 mm | 85% | 1.1 m/s | 5.4 |
| 1988 | 34.3°C | 27.6°C | 20.8°C | 39.7°C | 15.6°C | 90 mm | 61% | 1.1 m/s | 5.5 |
| 1987 | 32.8°C | 26.6°C | 20.5°C | 38.3°C | 15.7°C | 86 mm | 69% | 1 m/s | 6.3 |
| 1986 🔥 | 36.7°C | 29.7°C | 22.7°C | 41.0°C | 17.4°C | 65 mm | 53% | 1.1 m/s | 6.3 |
| 1985 | 31.6°C | 25.9°C | 20.2°C | 34.6°C | 16.5°C | 180 mm | 72% | 0.9 m/s | 5.1 |
| 1984 | 30.4°C | 25.2°C | 20.0°C | 36.2°C | 16.5°C | 247 mm | 77% | 1 m/s | 5.1 |
| 1983 | 34.0°C | 27.4°C | 20.9°C | 37.7°C | 15.8°C | 44 mm | 66% | 1.1 m/s | — |
| 1982 | 30.4°C | 25.6°C | 20.8°C | 33.8°C | 18.4°C | 137 mm | 79% | 0.9 m/s | — |
| 1981 | 35.6°C | 28.7°C | 21.7°C | 38.7°C | 17.2°C | 78 mm | 61% | 1.1 m/s | — |
Actual recorded July data for each year, 1981–2025 — sourced from NASA POWER.
The average high in July is around 33.1°C with lows near 21.3°C (mean 27.2°C), based on 45 years of NASA POWER data.
July averages 121 mm of rainfall in Decatur, a relatively wet time of year. The wettest on record was 321 mm in 1994.
The hottest July reached 41.7°C in 2012. The coldest dipped to 14.1°C in 2014.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average July temperatures have risen by about 1.4°C. Daytime highs moved from 32.4°C to 34.2°C and overnight lows from 20.7°C to 21.8°C over the same span.
July is one of the warmer months of the year in Decatur and a relatively wet time of year, so plan for around 33.1°C daytime highs and 21.3°C at night.
Not quite — July is the 12th coolest month in Decatur, averaging 27.2°C.
For July in Decatur, pack light, breathable clothing and sun protection, with typical highs of 33.1°C and lows of 21.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in July averages 70% — moderately humid.
Average wind speed in July is 1 m/s. The windiest July on record averaged 1.3 m/s (1996).
The wettest July on record was 1994 with 321 mm. On average, July sees 121 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 July, 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 July specifically, along with year-by-year records and how the month has changed over the decades.
