April is one of the cooler months of the year in Decatur, with average highs near 21.1°C and lows around 9.3°C (mean 15.2°C). It is about average for rainfall, averaging 121 mm of rainfall and 79% relative humidity across the period.
April is one of the cooler months of the year in Decatur. Across 45 years of records, the warmest April in Decatur was 2017 — when the month averaged 18.3°C — while the coldest was 1983 at 12.4°C. Typical April days reach 21.1°C with nights near 9.3°C. The long-term trend is warming, about 0.3°C per decade.
April is about average for rainfall in Decatur, averaging 121 mm of rainfall. The wettest April on record was 2011 with 238 mm, while the driest was 1986 at 20 mm.
Relative humidity in Decatur during April averages 79%. The most humid April was 1991 at 84%, and the least humid was 1986 at 66%.
April receives about 5.4 kWh/m²/day of solar energy in Decatur. The sunniest April was 2010 at 6.1 kWh/m²/day, and the cloudiest were 1984, 1991 and 1998 at 4.6.
Average wind speed in Decatur during April is 1.3 m/s. The windiest Aprils were 1983 and 2011 at 1.5 m/s, while the calmest were 1989, 2012 and 2021, among others at 1.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 14.5°C | 14.7°C | 15.4°C | 15.9°C | 15.4°C | +0.9°C |
| Avg High | 20.6°C | 20.5°C | 21.3°C | 21.8°C | 21.3°C | +0.7°C |
| Avg Low | 8.4°C | 8.9°C | 9.6°C | 10.1°C | 9.5°C | +1.1°C |
| Avg Rain | 115 mm | 112 mm | 107 mm | 142 mm | 132 mm | +17 mm |
April temperatures in Decatur have risen by about 1.1°C between 1981–1985 and 2021–2025.
April has ranged from a record low of -4.6°C (2007) to a record high of 31.5°C (1986).
Rainfall in April is about average for rainfall, averaging 121 mm, with a wettest year of 238 mm.
A good time to visit Decatur
April is a good time to visit Decatur, with days averaging 21.1°C and nights around 9.3°C (mean 15.2°C, close to Decatur's yearly average) and higher rainfall. September and May are marginally more temperate, but April still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 23.4°C | 17.7°C | 11.9°C | 28.8°C | 0.2°C | 158 mm | 81% | 1.2 m/s | 5.3 |
| 2024 | 22.0°C | 16.3°C | 10.7°C | 27.5°C | 0.9°C | 118 mm | 79% | 1.3 m/s | 5.2 |
| 2023 | 20.9°C | 14.9°C | 8.9°C | 27.3°C | 2.5°C | 122 mm | 78% | 1.2 m/s | 5.3 |
| 2022 | 20.8°C | 14.6°C | 8.5°C | 26.6°C | 1.4°C | 117 mm | 80% | 1.3 m/s | 5.7 |
| 2021 | 20.5°C | 14.7°C | 8.8°C | 28.9°C | -2.7°C | 82 mm | 77% | 1.1 m/s | 6 |
| 2020 | 20.1°C | 14.2°C | 8.2°C | 25.6°C | 0.5°C | 195 mm | 79% | 1.3 m/s | 5.6 |
| 2019 | 22.2°C | 16.4°C | 10.6°C | 27.2°C | -1.6°C | 175 mm | 80% | 1.2 m/s | 5.6 |
| 2018 | 19.1°C | 12.8°C | 6.5°C | 24.6°C | -1.8°C | 205 mm | 80% | 1.3 m/s | 5.5 |
| 2017 🔥 | 24.0°C | 18.3°C | 12.5°C | 27.9°C | 4.0°C | 116 mm | 79% | 1.2 m/s | 5.7 |
| 2016 | 21.1°C | 15.5°C | 9.9°C | 27.1°C | 2.3°C | 73 mm | 80% | 1.2 m/s | 5.8 |
| 2015 | 21.6°C | 16.4°C | 11.2°C | 26.2°C | 2.8°C | 164 mm | 84% | 1.2 m/s | 4.8 |
| 2014 | 21.2°C | 15.0°C | 8.9°C | 26.2°C | -1.5°C | 176 mm | 80% | 1.3 m/s | 5.5 |
| 2013 | 20.3°C | 14.7°C | 9.0°C | 26.4°C | 1.7°C | 155 mm | 82% | 1.3 m/s | 5.2 |
| 2012 | 22.8°C | 16.8°C | 10.8°C | 28.4°C | 1.8°C | 34 mm | 79% | 1.1 m/s | 6 |
| 2011 🌧️ | 22.6°C | 16.8°C | 11.0°C | 28.2°C | 2.7°C | 238 mm | 81% | 1.5 m/s | 5.5 |
| 2010 | 23.0°C | 16.7°C | 10.4°C | 27.0°C | 4.6°C | 85 mm | 75% | 1.2 m/s | 6.1 |
| 2009 | 20.2°C | 14.6°C | 9.0°C | 27.5°C | -0.1°C | 110 mm | 81% | 1.4 m/s | 5.2 |
| 2008 | 21.3°C | 15.1°C | 9.0°C | 27.0°C | 1.2°C | 105 mm | 78% | 1.2 m/s | 5.5 |
| 2007 | 20.4°C | 14.2°C | 7.9°C | 29.4°C | -4.6°C | 89 mm | 71% | 1.3 m/s | 5.6 |
| 2006 | 23.6°C | 17.7°C | 11.7°C | 29.9°C | 1.8°C | 125 mm | 79% | 1.3 m/s | 5.9 |
| 2005 | 20.6°C | 14.8°C | 9.1°C | 24.9°C | 1.9°C | 114 mm | 80% | 1.3 m/s | 5.2 |
| 2004 | 20.7°C | 14.7°C | 8.8°C | 27.0°C | 0.6°C | 74 mm | 78% | 1.2 m/s | 5.6 |
| 2003 | 21.8°C | 16.0°C | 10.3°C | 27.2°C | 2.4°C | 114 mm | 81% | 1.3 m/s | 5.3 |
| 2002 | 22.6°C | 17.0°C | 11.3°C | 28.7°C | 0.4°C | 49 mm | 80% | 1.3 m/s | 5.3 |
| 2001 | 21.9°C | 16.6°C | 11.3°C | 27.7°C | 0.4°C | 101 mm | 80% | 1.2 m/s | 5.3 |
| 2000 | 19.8°C | 13.6°C | 7.4°C | 25.7°C | -1.9°C | 186 mm | 80% | 1.3 m/s | 4.8 |
| 1999 | 22.7°C | 17.1°C | 11.5°C | 27.6°C | 0.7°C | 83 mm | 81% | 1.3 m/s | 5.3 |
| 1998 | 20.0°C | 14.6°C | 9.3°C | 25.3°C | 1.9°C | 134 mm | 83% | 1.3 m/s | 4.6 |
| 1997 | 18.9°C | 12.7°C | 6.5°C | 24.8°C | -0.3°C | 89 mm | 77% | 1.3 m/s | 5.7 |
| 1996 | 19.1°C | 12.8°C | 6.5°C | 25.3°C | -2.3°C | 110 mm | 78% | 1.4 m/s | 5.5 |
| 1995 | 21.8°C | 15.7°C | 9.5°C | 26.5°C | 1.7°C | 118 mm | 76% | 1.2 m/s | 5.4 |
| 1994 | 22.2°C | 16.3°C | 10.4°C | 27.8°C | 0.4°C | 108 mm | 82% | 1.2 m/s | 5.7 |
| 1993 | 18.5°C | 12.8°C | 7.1°C | 24.1°C | -2.1°C | 86 mm | 80% | 1.4 m/s | 4.9 |
| 1992 | 20.3°C | 14.6°C | 8.8°C | 27.4°C | -3.2°C | 70 mm | 80% | 1.2 m/s | 5.4 |
| 1991 | 21.9°C | 17.0°C | 12.1°C | 25.5°C | 3.0°C | 227 mm | 84% | 1.2 m/s | 4.6 |
| 1990 | 20.0°C | 13.8°C | 7.6°C | 26.7°C | -2.8°C | 100 mm | 80% | 1.2 m/s | 5.4 |
| 1989 | 19.9°C | 13.9°C | 8.0°C | 27.0°C | -3.6°C | 96 mm | 80% | 1.1 m/s | 5.4 |
| 1988 | 20.9°C | 14.7°C | 8.5°C | 27.4°C | 2.9°C | 106 mm | 77% | 1.2 m/s | 5.3 |
| 1987 | 19.9°C | 13.7°C | 7.4°C | 28.1°C | -3.8°C | 40 mm | 79% | 1.2 m/s | 5.6 |
| 1986 | 23.2°C | 15.9°C | 8.6°C | 31.5°C | -0.3°C | 20 mm | 66% | 1.1 m/s | 5.7 |
| 1985 | 21.9°C | 15.7°C | 9.5°C | 27.0°C | -1.2°C | 98 mm | 79% | 1.2 m/s | 5.7 |
| 1984 | 19.2°C | 14.0°C | 8.8°C | 27.2°C | 0.3°C | 157 mm | 82% | 1.3 m/s | 4.6 |
| 1983 ❄️ | 18.2°C | 12.4°C | 6.6°C | 24.7°C | -3.2°C | 220 mm | 81% | 1.5 m/s | — |
| 1982 | 19.0°C | 13.1°C | 7.1°C | 24.8°C | -2.9°C | 205 mm | 81% | 1.3 m/s | — |
| 1981 | 23.5°C | 17.5°C | 11.5°C | 27.4°C | 3.4°C | 93 mm | 78% | 1.3 m/s | — |
Actual recorded April data for each year, 1981–2025 — sourced from NASA POWER.
The average high in April is around 21.1°C with lows near 9.3°C (mean 15.2°C), based on 45 years of NASA POWER data.
April averages 121 mm of rainfall in Decatur, about average for rainfall. The wettest on record was 238 mm in 2011.
The hottest April reached 31.5°C in 1986. The coldest dipped to -4.6°C in 2007.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average April temperatures have risen by about 1.1°C. Daytime highs moved from 20.4°C to 21.5°C and overnight lows from 8.7°C to 9.8°C over the same span.
April is one of the cooler months of the year in Decatur and about average for rainfall, so plan for around 21.1°C daytime highs and 9.3°C at night.
Not quite — April is the 6th coolest month in Decatur, averaging 15.2°C.
For April in Decatur, pack light layers you can adjust through the day, with typical highs of 21.1°C and lows of 9.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in April averages 79% — quite humid.
Average wind speed in April is 1.3 m/s. The windiest April on record averaged 1.5 m/s (1983).
The wettest April on record was 2011 with 238 mm. On average, April 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 April, 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 April specifically, along with year-by-year records and how the month has changed over the decades.
