April is one of the cooler months of the year in Decatur, with average highs near 22.1°C and lows around 9.4°C (mean 15.8°C). It is about average for rainfall, averaging 98 mm of rainfall and 78% 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 18.5°C — while the coldest was 1983 at 12.7°C. Typical April days reach 22.1°C with nights near 9.4°C. The long-term trend is warming, about 0.4°C per decade.
April is about average for rainfall in Decatur, averaging 98 mm of rainfall. The wettest April on record was 1998 with 200 mm, while the driest was 1986 at 15 mm.
Relative humidity in Decatur during April averages 78%. The most humid April was 1991 at 84%, and the least humid was 1986 at 66%.
April receives about 5.5 kWh/m²/day of solar energy in Decatur. The sunniest April was 2010 at 6.2 kWh/m²/day, and the cloudiest was 1984 at 4.4.
Average wind speed in Decatur during April is 1.4 m/s. The windiest April was 1983 at 1.7 m/s, while the calmest were 2017, 2021 and 2025, among others at 1.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 14.9°C | 15.2°C | 15.9°C | 16.5°C | 16.0°C | +1.1°C |
| Avg High | 21.3°C | 21.5°C | 22.3°C | 22.8°C | 22.5°C | +1.2°C |
| Avg Low | 8.5°C | 9.0°C | 9.5°C | 10.4°C | 9.6°C | +1.1°C |
| Avg Rain | 100 mm | 94 mm | 80 mm | 110 mm | 109 mm | +8 mm |
April temperatures in Decatur have risen by about 1.4°C between 1981–1985 and 2021–2025.
April has ranged from a record low of -3.6°C (2007) to a record high of 33.2°C (1986).
Rainfall in April is about average for rainfall, averaging 98 mm, with a wettest year of 200 mm.
A good time to visit Decatur
April is a good time to visit Decatur, with days averaging 22.1°C and nights around 9.4°C (mean 15.8°C, close to Decatur's yearly average) and higher rainfall. May and September 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 | 24.5°C | 17.9°C | 11.4°C | 29.4°C | 2.3°C | 100 mm | 77% | 1.3 m/s | 5.6 |
| 2024 | 23.0°C | 16.8°C | 10.5°C | 28.7°C | 1.6°C | 100 mm | 79% | 1.4 m/s | 5.7 |
| 2023 | 22.2°C | 16.0°C | 9.8°C | 28.2°C | 3.2°C | 137 mm | 78% | 1.4 m/s | 5.4 |
| 2022 | 22.2°C | 15.2°C | 8.2°C | 27.4°C | 1.4°C | 107 mm | 76% | 1.4 m/s | 5.7 |
| 2021 | 21.9°C | 15.4°C | 8.8°C | 28.4°C | -2.2°C | 52 mm | 74% | 1.3 m/s | 6.1 |
| 2020 | 21.3°C | 15.0°C | 8.7°C | 26.2°C | 2.4°C | 157 mm | 77% | 1.6 m/s | 5.8 |
| 2019 | 23.0°C | 16.8°C | 10.6°C | 28.5°C | 1.2°C | 151 mm | 79% | 1.4 m/s | 5.7 |
| 2018 | 20.5°C | 13.9°C | 7.2°C | 25.7°C | 0.1°C | 117 mm | 77% | 1.5 m/s | 5.7 |
| 2017 🔥 | 24.7°C | 18.5°C | 12.4°C | 28.7°C | 2.2°C | 109 mm | 78% | 1.3 m/s | 5.5 |
| 2016 | 22.1°C | 16.1°C | 10.2°C | 29.5°C | 3.2°C | 86 mm | 78% | 1.4 m/s | 6 |
| 2015 | 22.8°C | 17.4°C | 12.0°C | 27.8°C | 4.6°C | 185 mm | 83% | 1.4 m/s | 4.9 |
| 2014 | 21.6°C | 15.6°C | 9.7°C | 26.5°C | -1.0°C | 156 mm | 82% | 1.5 m/s | 5.2 |
| 2013 | 21.3°C | 15.2°C | 9.2°C | 27.1°C | 3.0°C | 119 mm | 82% | 1.4 m/s | 5.4 |
| 2012 | 24.4°C | 17.9°C | 11.5°C | 32.9°C | 2.8°C | 27 mm | 74% | 1.3 m/s | 5.8 |
| 2011 | 23.8°C | 17.2°C | 10.7°C | 28.4°C | 3.7°C | 89 mm | 78% | 1.6 m/s | 6.1 |
| 2010 | 23.5°C | 16.8°C | 10.1°C | 28.3°C | 5.4°C | 65 mm | 78% | 1.3 m/s | 6.2 |
| 2009 | 21.0°C | 14.9°C | 8.7°C | 28.5°C | -1.4°C | 119 mm | 82% | 1.6 m/s | 5.4 |
| 2008 | 21.7°C | 15.5°C | 9.3°C | 26.7°C | 2.2°C | 84 mm | 79% | 1.3 m/s | 5.4 |
| 2007 | 21.4°C | 14.6°C | 7.8°C | 30.1°C | -3.6°C | 47 mm | 70% | 1.6 m/s | 5.7 |
| 2006 | 24.8°C | 18.1°C | 11.4°C | 29.2°C | 3.7°C | 63 mm | 74% | 1.4 m/s | 5.9 |
| 2005 | 20.7°C | 14.6°C | 8.5°C | 25.5°C | 1.6°C | 124 mm | 80% | 1.5 m/s | 5.5 |
| 2004 | 23.6°C | 16.3°C | 9.0°C | 30.9°C | 1.5°C | 50 mm | 68% | 1.4 m/s | 5.9 |
| 2003 | 21.9°C | 16.0°C | 10.2°C | 27.7°C | 1.9°C | 118 mm | 83% | 1.3 m/s | 4.9 |
| 2002 | 24.1°C | 18.0°C | 11.8°C | 30.2°C | 2.0°C | 57 mm | 76% | 1.4 m/s | 5.1 |
| 2001 | 22.5°C | 16.5°C | 10.4°C | 29.8°C | 0.4°C | 73 mm | 81% | 1.3 m/s | 5.6 |
| 2000 | 21.1°C | 14.3°C | 7.4°C | 27.2°C | -1.1°C | 67 mm | 76% | 1.6 m/s | 5.2 |
| 1999 | 24.4°C | 18.1°C | 11.7°C | 31.0°C | 3.1°C | 38 mm | 75% | 1.6 m/s | 5.3 |
| 1998 🌧️ | 20.7°C | 15.0°C | 9.3°C | 24.9°C | 2.8°C | 200 mm | 83% | 1.5 m/s | 4.9 |
| 1997 | 20.2°C | 13.8°C | 7.5°C | 25.3°C | 0.8°C | 129 mm | 76% | 1.5 m/s | 5.6 |
| 1996 | 20.1°C | 13.6°C | 7.0°C | 26.7°C | -0.9°C | 90 mm | 78% | 1.6 m/s | 5.7 |
| 1995 | 22.3°C | 15.8°C | 9.3°C | 27.4°C | 1.5°C | 65 mm | 79% | 1.3 m/s | 5.6 |
| 1994 | 23.4°C | 16.9°C | 10.4°C | 28.2°C | 1.5°C | 93 mm | 79% | 1.3 m/s | 5.9 |
| 1993 | 19.3°C | 12.9°C | 6.6°C | 25.9°C | -2.1°C | 67 mm | 79% | 1.6 m/s | 5.4 |
| 1992 | 21.0°C | 14.6°C | 8.2°C | 27.4°C | -3.2°C | 47 mm | 79% | 1.3 m/s | 5.6 |
| 1991 | 22.7°C | 17.4°C | 12.1°C | 28.1°C | 2.7°C | 143 mm | 84% | 1.3 m/s | 4.5 |
| 1990 | 20.9°C | 14.4°C | 8.0°C | 28.0°C | -1.7°C | 64 mm | 79% | 1.5 m/s | 5.8 |
| 1989 | 21.0°C | 14.9°C | 8.7°C | 28.2°C | -1.1°C | 152 mm | 78% | 1.3 m/s | 5.5 |
| 1988 | 21.6°C | 15.1°C | 8.6°C | 28.2°C | 2.5°C | 128 mm | 77% | 1.5 m/s | 5 |
| 1987 | 20.2°C | 13.8°C | 7.4°C | 29.0°C | -3.1°C | 25 mm | 78% | 1.4 m/s | 5.7 |
| 1986 | 24.0°C | 16.2°C | 8.4°C | 33.2°C | -0.5°C | 15 mm | 66% | 1.3 m/s | 6.1 |
| 1985 | 22.5°C | 16.0°C | 9.4°C | 28.5°C | -0.6°C | 59 mm | 74% | 1.3 m/s | 5.7 |
| 1984 | 20.4°C | 14.7°C | 9.0°C | 27.1°C | 2.0°C | 122 mm | 83% | 1.5 m/s | 4.4 |
| 1983 ❄️ | 18.9°C | 12.7°C | 6.4°C | 25.1°C | -3.0°C | 138 mm | 81% | 1.7 m/s | — |
| 1982 | 19.7°C | 13.8°C | 8.0°C | 25.5°C | -2.9°C | 197 mm | 80% | 1.5 m/s | — |
| 1981 | 23.7°C | 17.2°C | 10.7°C | 29.0°C | 2.8°C | 67 mm | 78% | 1.4 m/s | — |
Actual recorded April data for each year, 1981–2025 — sourced from NASA POWER.
The average high in April is around 22.1°C with lows near 9.4°C (mean 15.8°C), based on 45 years of NASA POWER data.
April averages 98 mm of rainfall in Decatur, about average for rainfall. The wettest on record was 200 mm in 1998.
The hottest April reached 33.2°C in 1986. The coldest dipped to -3.6°C in 2007.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average April temperatures have risen by about 1.4°C. Daytime highs moved from 21°C to 22.8°C and overnight lows from 8.7°C to 9.7°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 22.1°C daytime highs and 9.4°C at night.
Not quite — April is the 6th coolest month in Decatur, averaging 15.8°C.
For April in Decatur, pack light layers you can adjust through the day, with typical highs of 22.1°C and lows of 9.4°C. Bring an umbrella or light rain jacket too.
Relative humidity in April averages 78% — quite humid.
Average wind speed in April is 1.4 m/s. The windiest April on record averaged 1.7 m/s (1983).
The wettest April on record was 1998 with 200 mm. On average, April sees 98 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.
