April is one of the cooler months of the year in Chicago Heights, with average highs near 14.4°C and lows around 3.2°C (mean 8.8°C). It is a relatively wet time of year, averaging 92 mm of rainfall and 77% relative humidity across the period.
April is one of the cooler months of the year in Chicago Heights. Across 45 years of records, the warmest April in Chicago Heights was 2010 — when the month averaged 11.9°C — while the coldest was 2018 at 4.7°C. Typical April days reach 14.4°C with nights near 3.2°C. The long-term trend is warming, about 0.3°C per decade.
April is a relatively wet time of year in Chicago Heights, averaging 92 mm of rainfall. The wettest April on record was 1981 with 185 mm, while the driest was 2004 at 38 mm.
Relative humidity in Chicago Heights during April averages 77%. The most humid April was 1993 at 84%, and the least humid was 2000 at 70%.
April receives about 4.6 kWh/m²/day of solar energy in Chicago Heights. The sunniest April was 2004 at 5.3 kWh/m²/day, and the cloudiest was 1992 at 3.7.
Average wind speed in Chicago Heights during April is 3.9 m/s. The windiest April was 1981 at 4.5 m/s, while the calmest was 1989 at 3.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 8.3°C | 8.1°C | 9.5°C | 9.0°C | 9.3°C | +1°C |
| Avg High | 13.9°C | 13.4°C | 15.3°C | 14.6°C | 14.8°C | +0.9°C |
| Avg Low | 2.7°C | 2.8°C | 3.8°C | 3.4°C | 3.7°C | +1°C |
| Avg Rain | 90 mm | 99 mm | 85 mm | 99 mm | 81 mm | -9 mm |
April temperatures in Chicago Heights have risen by about 1.4°C between 1981–1985 and 2021–2025.
April has ranged from a record low of -8.3°C (1982) to a record high of 26.9°C (2001).
Rainfall in April is a relatively wet time of year, averaging 92 mm, with a wettest year of 185 mm.
A good time to visit Chicago Heights
April is a good time to visit Chicago Heights, with days averaging 14.4°C and nights around 3.2°C (mean 8.8°C, cooler than Chicago Heights's yearly average) and higher rainfall. August and July 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 | 15.5°C | 9.7°C | 3.9°C | 25.8°C | -3.7°C | 74 mm | 74% | 4 m/s | 4.4 |
| 2024 | 16.1°C | 10.7°C | 5.3°C | 25.0°C | -1.3°C | 121 mm | 77% | 4.2 m/s | 4.7 |
| 2023 | 16.0°C | 9.6°C | 3.2°C | 25.9°C | -2.8°C | 38 mm | 74% | 3.8 m/s | 4.9 |
| 2022 | 12.9°C | 7.8°C | 2.6°C | 24.8°C | -3.0°C | 80 mm | 77% | 4.2 m/s | 4.1 |
| 2021 | 15.4°C | 9.9°C | 4.4°C | 26.8°C | -3.8°C | 49 mm | 73% | 3.4 m/s | 4.9 |
| 2020 | 13.1°C | 7.8°C | 2.5°C | 22.7°C | -3.9°C | 125 mm | 79% | 3.6 m/s | 4.7 |
| 2019 | 14.7°C | 9.2°C | 3.8°C | 22.7°C | -3.7°C | 144 mm | 79% | 4 m/s | 4.5 |
| 2018 ❄️ | 10.0°C | 4.7°C | -0.6°C | 21.7°C | -5.9°C | 51 mm | 77% | 3.4 m/s | 4.9 |
| 2017 | 16.6°C | 11.2°C | 5.9°C | 24.2°C | -0.7°C | 135 mm | 80% | 3.9 m/s | 4.5 |
| 2016 | 14.1°C | 8.6°C | 3.2°C | 26.7°C | -4.1°C | 73 mm | 77% | 3.9 m/s | 4.4 |
| 2015 | 15.4°C | 9.4°C | 3.5°C | 24.1°C | -3.7°C | 68 mm | 72% | 3.7 m/s | 4.9 |
| 2014 | 14.2°C | 8.4°C | 2.6°C | 22.7°C | -3.7°C | 72 mm | 76% | 4 m/s | 4.8 |
| 2013 | 13.7°C | 8.0°C | 2.3°C | 25.6°C | -4.9°C | 166 mm | 78% | 4.1 m/s | 4.6 |
| 2012 | 15.4°C | 9.9°C | 4.4°C | 23.4°C | -1.5°C | 48 mm | 74% | 4 m/s | 5 |
| 2011 | 14.3°C | 8.9°C | 3.5°C | 25.8°C | -1.8°C | 154 mm | 80% | 4.4 m/s | 3.8 |
| 2010 🔥 | 17.9°C | 11.9°C | 5.8°C | 25.5°C | -2.2°C | 79 mm | 77% | 3.9 m/s | 5.1 |
| 2009 | 12.9°C | 8.0°C | 3.1°C | 25.1°C | -3.6°C | 132 mm | 83% | 4 m/s | 4.3 |
| 2008 | 14.4°C | 9.0°C | 3.6°C | 23.5°C | -2.6°C | 70 mm | 80% | 3.9 m/s | 4.6 |
| 2007 | 12.7°C | 7.5°C | 2.3°C | 23.7°C | -5.0°C | 107 mm | 78% | 3.8 m/s | 4.7 |
| 2006 | 17.3°C | 11.2°C | 5.1°C | 26.3°C | -1.5°C | 98 mm | 72% | 4 m/s | 5 |
| 2005 | 16.3°C | 10.6°C | 4.9°C | 25.9°C | -0.6°C | 43 mm | 74% | 3.8 m/s | 5 |
| 2004 | 16.0°C | 10.0°C | 3.9°C | 26.0°C | -2.8°C | 38 mm | 72% | 4.3 m/s | 5.3 |
| 2003 | 16.0°C | 9.5°C | 3.1°C | 26.6°C | -4.0°C | 89 mm | 72% | 3.8 m/s | 4.7 |
| 2002 | 14.6°C | 9.2°C | 3.8°C | 26.4°C | -3.8°C | 112 mm | 80% | 3.8 m/s | 4.3 |
| 2001 | 17.3°C | 11.3°C | 5.2°C | 26.9°C | -3.6°C | 68 mm | 74% | 4.2 m/s | 4.9 |
| 2000 | 15.2°C | 8.9°C | 2.7°C | 23.4°C | -2.5°C | 93 mm | 70% | 3.6 m/s | 4.6 |
| 1999 | 15.2°C | 9.8°C | 4.5°C | 21.3°C | -0.1°C | 164 mm | 79% | 3.6 m/s | 4.1 |
| 1998 | 14.7°C | 9.4°C | 4.2°C | 22.1°C | -0.4°C | 108 mm | 79% | 3.4 m/s | 4.2 |
| 1997 | 11.9°C | 6.5°C | 1.0°C | 20.2°C | -4.4°C | 49 mm | 75% | 3.5 m/s | 5 |
| 1996 | 12.7°C | 7.0°C | 1.3°C | 22.7°C | -4.1°C | 98 mm | 73% | 4.2 m/s | 4.5 |
| 1995 | 11.9°C | 6.9°C | 1.9°C | 22.6°C | -7.9°C | 137 mm | 78% | 4 m/s | 4.1 |
| 1994 | 14.1°C | 8.3°C | 2.6°C | 25.0°C | -4.2°C | 103 mm | 78% | 4.4 m/s | 5 |
| 1993 | 12.0°C | 7.2°C | 2.4°C | 20.2°C | -4.3°C | 111 mm | 84% | 3.8 m/s | 4.2 |
| 1992 | 12.5°C | 7.4°C | 2.4°C | 21.5°C | -3.9°C | 58 mm | 82% | 3.5 m/s | 3.7 |
| 1991 | 15.3°C | 10.0°C | 4.6°C | 22.7°C | -3.1°C | 112 mm | 82% | 4.2 m/s | 4.7 |
| 1990 | 13.9°C | 8.3°C | 2.8°C | 24.7°C | -5.3°C | 54 mm | 77% | 3.8 m/s | 4.6 |
| 1989 | 13.2°C | 7.5°C | 1.7°C | 23.2°C | -5.3°C | 51 mm | 76% | 3.2 m/s | 4.6 |
| 1988 | 13.8°C | 7.8°C | 1.8°C | 22.8°C | -3.6°C | 63 mm | 75% | 3.9 m/s | 4.5 |
| 1987 | 14.9°C | 9.2°C | 3.6°C | 25.4°C | -4.8°C | 76 mm | 76% | 3.6 m/s | 5.1 |
| 1986 | 15.8°C | 9.7°C | 3.5°C | 26.2°C | -3.8°C | 61 mm | 77% | 3.8 m/s | 4.6 |
| 1985 | 15.7°C | 10.7°C | 5.8°C | 23.9°C | -4.4°C | 44 mm | 81% | 4 m/s | 4.7 |
| 1984 | 12.3°C | 7.5°C | 2.7°C | 24.1°C | -2.5°C | 92 mm | 83% | 4.3 m/s | 4 |
| 1983 | 11.7°C | 6.7°C | 1.7°C | 20.0°C | -3.7°C | 161 mm | 82% | 3.9 m/s | — |
| 1982 | 11.8°C | 5.9°C | -0.1°C | 20.0°C | -8.3°C | 73 mm | 77% | 4.2 m/s | — |
| 1981 🌧️ | 16.2°C | 9.9°C | 3.6°C | 24.6°C | -3.5°C | 185 mm | 75% | 4.5 m/s | — |
Actual recorded April data for each year, 1981–2025 — sourced from NASA POWER.
The average high in April is around 14.4°C with lows near 3.2°C (mean 8.8°C), based on 45 years of NASA POWER data.
April averages 92 mm of rainfall in Chicago Heights, a relatively wet time of year. The wettest on record was 185 mm in 1981.
The hottest April reached 26.9°C in 2001. The coldest dipped to -8.3°C in 1982.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average April temperatures have risen by about 1.4°C. Daytime highs moved from 13.5°C to 15.2°C and overnight lows from 2.7°C to 3.9°C over the same span.
April is one of the cooler months of the year in Chicago Heights and a relatively wet time of year, so plan for around 14.4°C daytime highs and 3.2°C at night.
Not quite — April is the 6th coolest month in Chicago Heights, averaging 8.8°C.
For April in Chicago Heights, pack warm layers and a jacket for chilly mornings, with typical highs of 14.4°C and lows of 3.2°C. Bring an umbrella or light rain jacket too.
Relative humidity in April averages 77% — quite humid.
Average wind speed in April is 3.9 m/s. The windiest April on record averaged 4.5 m/s (1981).
The wettest April on record was 1981 with 185 mm. On average, April sees 92 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 Chicago Heights 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.
