April is close to Decatur's year-round average, with average highs near 17.2°C and lows around 4.8°C (mean 11°C). It is a relatively wet time of year, averaging 100 mm of rainfall and 75% relative humidity across the period.
April is close to Decatur's year-round average. Across 45 years of records, the warmest April in Decatur was 2010 — when the month averaged 14.2°C — while the coldest was 2018 at 7°C. Typical April days reach 17.2°C with nights near 4.8°C. The long-term trend is warming, about 0.3°C per decade.
April is a relatively wet time of year in Decatur, averaging 100 mm of rainfall. The wettest April on record was 1994 with 218 mm, while the driest was 1988 at 35 mm.
Relative humidity in Decatur during April averages 75%. The most humid April was 1984 at 82%, and the least humid was 2000 at 67%.
April receives about 4.8 kWh/m²/day of solar energy in Decatur. The sunniest April was 1997 at 5.5 kWh/m²/day, and the cloudiest was 1984 at 3.7.
Average wind speed in Decatur during April is 4 m/s. The windiest April was 1981 at 4.6 m/s, while the calmest was 1989 at 3.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 10.5°C | 10.3°C | 11.7°C | 11.5°C | 11.1°C | +0.6°C |
| Avg High | 16.8°C | 16.4°C | 18.0°C | 17.8°C | 17.3°C | +0.5°C |
| Avg Low | 4.2°C | 4.1°C | 5.4°C | 5.4°C | 4.9°C | +0.7°C |
| Avg Rain | 93 mm | 106 mm | 92 mm | 110 mm | 96 mm | +3 mm |
April temperatures in Decatur have risen by about 1.2°C between 1981–1985 and 2021–2025.
April has ranged from a record low of -7.3°C (1982) to a record high of 28.7°C (2007).
Rainfall in April is a relatively wet time of year, averaging 100 mm, with a wettest year of 218 mm.
A good time to visit Decatur
April is a good time to visit Decatur, with days averaging 17.2°C and nights around 4.8°C (mean 11°C, close to Decatur's yearly average) and higher rainfall. June and August 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 | 18.4°C | 12.4°C | 6.3°C | 27.1°C | -4.7°C | 115 mm | 73% | 4 m/s | 4.6 |
| 2024 | 18.4°C | 12.4°C | 6.4°C | 27.2°C | -2.4°C | 164 mm | 74% | 4.3 m/s | 4.7 |
| 2023 | 18.4°C | 11.4°C | 4.3°C | 26.3°C | -1.6°C | 47 mm | 70% | 3.9 m/s | 5.4 |
| 2022 | 15.9°C | 9.6°C | 3.3°C | 25.9°C | -3.2°C | 75 mm | 77% | 4.4 m/s | 4.6 |
| 2021 | 17.3°C | 11.2°C | 5.2°C | 27.1°C | -5.2°C | 57 mm | 75% | 3.6 m/s | 5.3 |
| 2020 | 15.6°C | 9.7°C | 3.7°C | 26.0°C | -3.6°C | 116 mm | 76% | 3.8 m/s | 5.1 |
| 2019 | 17.2°C | 11.4°C | 5.7°C | 25.1°C | -3.5°C | 122 mm | 79% | 4 m/s | 4.6 |
| 2018 ❄️ | 13.4°C | 7.0°C | 0.7°C | 24.7°C | -6.8°C | 70 mm | 75% | 3.8 m/s | 5 |
| 2017 | 19.7°C | 13.8°C | 7.9°C | 26.5°C | -1.0°C | 159 mm | 76% | 4 m/s | 4.6 |
| 2016 | 17.6°C | 11.3°C | 5.0°C | 26.3°C | -5.2°C | 104 mm | 76% | 3.7 m/s | 5.1 |
| 2015 | 18.4°C | 11.9°C | 5.5°C | 25.1°C | -4.2°C | 77 mm | 71% | 3.8 m/s | 5 |
| 2014 | 17.6°C | 11.0°C | 4.4°C | 25.7°C | -4.6°C | 96 mm | 74% | 3.9 m/s | 5 |
| 2013 | 16.5°C | 10.3°C | 4.1°C | 27.0°C | -5.7°C | 156 mm | 77% | 4 m/s | 4.6 |
| 2012 | 18.9°C | 12.5°C | 6.2°C | 28.4°C | -1.9°C | 84 mm | 70% | 4 m/s | 5.1 |
| 2011 | 18.1°C | 11.9°C | 5.8°C | 28.4°C | -1.2°C | 154 mm | 78% | 4.4 m/s | 4.4 |
| 2010 🔥 | 20.2°C | 14.2°C | 8.2°C | 26.9°C | 1.3°C | 80 mm | 77% | 3.8 m/s | 5.4 |
| 2009 | 15.6°C | 10.2°C | 4.7°C | 26.4°C | -3.3°C | 163 mm | 80% | 4.1 m/s | 4.4 |
| 2008 | 16.0°C | 10.3°C | 4.5°C | 25.2°C | -1.8°C | 72 mm | 80% | 4.1 m/s | 4.9 |
| 2007 | 15.6°C | 9.5°C | 3.4°C | 28.7°C | -6.6°C | 79 mm | 75% | 4 m/s | 5 |
| 2006 | 20.3°C | 13.6°C | 6.8°C | 27.8°C | -2.4°C | 125 mm | 72% | 3.9 m/s | 5.1 |
| 2005 | 18.5°C | 12.4°C | 6.3°C | 26.6°C | -1.2°C | 51 mm | 76% | 3.8 m/s | 5 |
| 2004 | 18.7°C | 12.2°C | 5.7°C | 28.1°C | -2.4°C | 51 mm | 72% | 4.2 m/s | 5.4 |
| 2003 | 19.2°C | 12.2°C | 5.3°C | 27.8°C | -3.3°C | 83 mm | 71% | 4.2 m/s | 4.9 |
| 2002 | 18.2°C | 11.8°C | 5.3°C | 28.5°C | -5.2°C | 157 mm | 78% | 4 m/s | 4.8 |
| 2001 | 20.4°C | 14.0°C | 7.6°C | 28.2°C | -3.9°C | 69 mm | 73% | 4.4 m/s | 5.2 |
| 2000 | 17.8°C | 11.0°C | 4.1°C | 24.9°C | -2.8°C | 67 mm | 67% | 3.8 m/s | 4.6 |
| 1999 | 17.8°C | 12.2°C | 6.6°C | 24.4°C | 0.6°C | 138 mm | 79% | 4.3 m/s | 4.1 |
| 1998 | 16.8°C | 10.9°C | 5.0°C | 23.1°C | -1.7°C | 121 mm | 76% | 3.8 m/s | 4.6 |
| 1997 | 15.0°C | 8.3°C | 1.6°C | 23.7°C | -6.4°C | 41 mm | 71% | 3.6 m/s | 5.5 |
| 1996 | 15.8°C | 9.0°C | 2.2°C | 23.8°C | -4.7°C | 102 mm | 69% | 4.4 m/s | 4.8 |
| 1995 | 16.2°C | 10.0°C | 3.7°C | 24.8°C | -6.0°C | 99 mm | 75% | 4 m/s | 4.6 |
| 1994 🌧️ | 16.4°C | 10.2°C | 4.0°C | 27.0°C | -5.1°C | 218 mm | 79% | 4.3 m/s | 4.7 |
| 1993 | 14.6°C | 9.1°C | 3.6°C | 21.7°C | -4.5°C | 129 mm | 82% | 3.8 m/s | 4.3 |
| 1992 | 16.2°C | 10.2°C | 4.2°C | 25.5°C | -4.7°C | 72 mm | 78% | 3.7 m/s | 4.3 |
| 1991 | 18.4°C | 12.5°C | 6.6°C | 25.0°C | -1.8°C | 97 mm | 79% | 4.2 m/s | 4.8 |
| 1990 | 16.3°C | 10.1°C | 3.8°C | 26.3°C | -6.0°C | 47 mm | 73% | 3.8 m/s | 4.7 |
| 1989 | 16.4°C | 10.1°C | 3.7°C | 28.2°C | -6.4°C | 129 mm | 74% | 3.3 m/s | 5 |
| 1988 | 17.1°C | 9.9°C | 2.7°C | 26.2°C | -3.5°C | 35 mm | 71% | 4 m/s | 5.2 |
| 1987 | 17.9°C | 11.2°C | 4.4°C | 28.5°C | -5.0°C | 61 mm | 73% | 3.4 m/s | 5.2 |
| 1986 | 18.7°C | 12.1°C | 5.5°C | 27.3°C | -3.0°C | 59 mm | 73% | 4 m/s | 5.1 |
| 1985 | 18.3°C | 12.5°C | 6.7°C | 25.4°C | -5.0°C | 68 mm | 81% | 3.9 m/s | 5 |
| 1984 | 14.4°C | 9.3°C | 4.2°C | 25.9°C | -2.0°C | 127 mm | 82% | 4.4 m/s | 3.7 |
| 1983 | 13.6°C | 8.2°C | 2.7°C | 22.7°C | -5.1°C | 143 mm | 80% | 3.9 m/s | — |
| 1982 | 14.1°C | 7.6°C | 1.2°C | 23.5°C | -7.3°C | 81 mm | 76% | 4.1 m/s | — |
| 1981 | 20.3°C | 13.6°C | 6.8°C | 27.9°C | -4.0°C | 131 mm | 70% | 4.6 m/s | — |
Actual recorded April data for each year, 1981–2025 — sourced from NASA POWER.
The average high in April is around 17.2°C with lows near 4.8°C (mean 11°C), based on 45 years of NASA POWER data.
April averages 100 mm of rainfall in Decatur, a relatively wet time of year. The wettest on record was 218 mm in 1994.
The hottest April reached 28.7°C in 2007. The coldest dipped to -7.3°C in 1982.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average April temperatures have risen by about 1.2°C. Daytime highs moved from 16.1°C to 17.7°C and overnight lows from 4.3°C to 5.1°C over the same span.
April is close to Decatur's year-round average and a relatively wet time of year, so plan for around 17.2°C daytime highs and 4.8°C at night.
Not quite — April is the 6th coolest month in Decatur, averaging 11°C.
For April in Decatur, pack warm layers and a jacket for chilly mornings, with typical highs of 17.2°C and lows of 4.8°C. Bring an umbrella or light rain jacket too.
Relative humidity in April averages 75% — quite humid.
Average wind speed in April is 4 m/s. The windiest April on record averaged 4.6 m/s (1981).
The wettest April on record was 1994 with 218 mm. On average, April sees 100 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.
