April is close to Joliet's year-round average, with average highs near 15.6°C and lows around 3.1°C (mean 9.4°C). It is a relatively wet time of year, averaging 91 mm of rainfall and 75% relative humidity across the period.
April is close to Joliet's year-round average. Across 45 years of records, the warmest April in Joliet was 2010 — when the month averaged 12.7°C — while the coldest was 2018 at 5°C. Typical April days reach 15.6°C with nights near 3.1°C. The long-term trend is warming, about 0.2°C per decade.
April is a relatively wet time of year in Joliet, averaging 91 mm of rainfall. The wettest April on record was 2013 with 195 mm, while the driest was 1985 at 40 mm.
Relative humidity in Joliet during April averages 75%. The most humid April was 1993 at 82%, and the least humid was 2000 at 68%.
April receives about 4.7 kWh/m²/day of solar energy in Joliet. The sunniest Aprils were 2004 and 2010 at 5.3 kWh/m²/day, and the cloudiest were 1992 and 2011 at 3.8.
Average wind speed in Joliet 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 | 8.9°C | 8.6°C | 10.1°C | 9.5°C | 9.6°C | +0.7°C |
| Avg High | 15.2°C | 14.6°C | 16.6°C | 15.7°C | 15.9°C | +0.7°C |
| Avg Low | 2.6°C | 2.7°C | 3.8°C | 3.2°C | 3.4°C | +0.8°C |
| Avg Rain | 87 mm | 94 mm | 86 mm | 102 mm | 82 mm | -5 mm |
April temperatures in Joliet have risen by about 1.2°C between 1981–1985 and 2021–2025.
April has ranged from a record low of -9.7°C (1982) to a record high of 28.7°C (2003).
Rainfall in April is a relatively wet time of year, averaging 91 mm, with a wettest year of 195 mm.
A good time to visit Joliet
April is a good time to visit Joliet, with days averaging 15.6°C and nights around 3.1°C (mean 9.4°C, close to Joliet'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 | 16.8°C | 10.4°C | 3.9°C | 26.7°C | -5.6°C | 79 mm | 72% | 4 m/s | 4.6 |
| 2024 | 17.1°C | 11.0°C | 4.9°C | 26.6°C | -2.6°C | 115 mm | 75% | 4.1 m/s | 4.7 |
| 2023 | 17.0°C | 10.0°C | 2.9°C | 27.1°C | -3.0°C | 43 mm | 73% | 3.8 m/s | 5 |
| 2022 | 13.8°C | 7.9°C | 2.0°C | 26.4°C | -4.1°C | 91 mm | 75% | 4.2 m/s | 4.2 |
| 2021 | 16.6°C | 10.4°C | 4.2°C | 28.1°C | -5.3°C | 44 mm | 73% | 3.4 m/s | 5.1 |
| 2020 | 14.1°C | 8.1°C | 2.2°C | 24.3°C | -5.0°C | 119 mm | 78% | 3.6 m/s | 4.9 |
| 2019 | 15.7°C | 9.6°C | 3.5°C | 25.1°C | -4.3°C | 140 mm | 78% | 4 m/s | 4.5 |
| 2018 ❄️ | 10.9°C | 5.0°C | -0.9°C | 23.2°C | -6.8°C | 44 mm | 75% | 3.3 m/s | 4.8 |
| 2017 | 17.5°C | 11.6°C | 5.7°C | 25.9°C | -1.8°C | 151 mm | 78% | 3.9 m/s | 4.5 |
| 2016 | 15.1°C | 8.9°C | 2.8°C | 27.2°C | -5.7°C | 68 mm | 76% | 3.8 m/s | 4.6 |
| 2015 | 16.8°C | 10.0°C | 3.3°C | 24.9°C | -4.2°C | 78 mm | 70% | 3.7 m/s | 5 |
| 2014 | 15.4°C | 9.0°C | 2.5°C | 23.5°C | -5.5°C | 80 mm | 75% | 3.9 m/s | 4.7 |
| 2013 🌧️ | 14.6°C | 8.3°C | 2.0°C | 27.1°C | -5.5°C | 195 mm | 77% | 4 m/s | 4.6 |
| 2012 | 16.5°C | 10.2°C | 4.0°C | 24.6°C | -2.9°C | 50 mm | 73% | 3.9 m/s | 5 |
| 2011 | 15.2°C | 9.3°C | 3.4°C | 27.8°C | -2.5°C | 145 mm | 79% | 4.4 m/s | 3.8 |
| 2010 🔥 | 19.3°C | 12.7°C | 6.0°C | 26.7°C | -3.0°C | 71 mm | 76% | 3.8 m/s | 5.3 |
| 2009 | 13.8°C | 8.3°C | 2.8°C | 26.5°C | -4.2°C | 139 mm | 82% | 3.9 m/s | 4.5 |
| 2008 | 15.5°C | 9.6°C | 3.7°C | 25.0°C | -2.3°C | 69 mm | 78% | 4 m/s | 4.5 |
| 2007 | 13.8°C | 7.9°C | 2.1°C | 25.7°C | -5.6°C | 95 mm | 77% | 3.8 m/s | 4.8 |
| 2006 | 18.6°C | 11.8°C | 5.1°C | 27.3°C | -2.6°C | 102 mm | 71% | 4.1 m/s | 5.1 |
| 2005 | 17.7°C | 11.3°C | 5.0°C | 27.1°C | -0.9°C | 50 mm | 73% | 3.8 m/s | 5.1 |
| 2004 | 17.3°C | 10.5°C | 3.7°C | 27.6°C | -3.2°C | 46 mm | 72% | 4.1 m/s | 5.3 |
| 2003 | 17.6°C | 10.4°C | 3.3°C | 28.7°C | -5.0°C | 88 mm | 70% | 3.8 m/s | 4.6 |
| 2002 | 15.9°C | 10.0°C | 4.0°C | 28.3°C | -4.4°C | 110 mm | 77% | 3.8 m/s | 4.3 |
| 2001 | 18.9°C | 12.0°C | 5.2°C | 28.2°C | -4.3°C | 69 mm | 73% | 4.2 m/s | 5.1 |
| 2000 | 16.6°C | 9.6°C | 2.7°C | 24.4°C | -3.4°C | 95 mm | 68% | 3.6 m/s | 4.7 |
| 1999 | 16.3°C | 10.4°C | 4.5°C | 23.4°C | -0.6°C | 152 mm | 77% | 3.8 m/s | 4.1 |
| 1998 | 15.5°C | 9.9°C | 4.2°C | 23.5°C | -2.6°C | 99 mm | 77% | 3.4 m/s | 4.2 |
| 1997 | 13.0°C | 6.8°C | 0.7°C | 22.0°C | -5.4°C | 53 mm | 73% | 3.5 m/s | 4.9 |
| 1996 | 14.1°C | 7.6°C | 1.1°C | 24.6°C | -4.9°C | 84 mm | 71% | 4.1 m/s | 4.7 |
| 1995 | 13.0°C | 7.4°C | 1.8°C | 24.1°C | -8.7°C | 138 mm | 76% | 4 m/s | 4.1 |
| 1994 | 15.2°C | 8.8°C | 2.4°C | 26.7°C | -5.1°C | 89 mm | 77% | 4.3 m/s | 5.2 |
| 1993 | 13.2°C | 7.6°C | 2.0°C | 22.0°C | -6.6°C | 113 mm | 82% | 3.7 m/s | 4.3 |
| 1992 | 13.9°C | 8.1°C | 2.4°C | 22.7°C | -4.3°C | 54 mm | 80% | 3.5 m/s | 3.8 |
| 1991 | 16.8°C | 10.8°C | 4.7°C | 24.5°C | -3.4°C | 107 mm | 79% | 4.2 m/s | 4.7 |
| 1990 | 15.2°C | 9.0°C | 2.7°C | 26.4°C | -5.9°C | 48 mm | 74% | 3.8 m/s | 4.7 |
| 1989 | 14.5°C | 8.1°C | 1.7°C | 24.3°C | -5.7°C | 47 mm | 74% | 3.2 m/s | 4.6 |
| 1988 | 15.1°C | 8.4°C | 1.6°C | 24.9°C | -4.8°C | 63 mm | 74% | 3.9 m/s | 4.7 |
| 1987 | 16.7°C | 10.2°C | 3.6°C | 27.1°C | -5.1°C | 74 mm | 74% | 3.5 m/s | 5.1 |
| 1986 | 17.3°C | 10.4°C | 3.5°C | 27.9°C | -5.1°C | 52 mm | 76% | 3.9 m/s | 4.6 |
| 1985 | 17.0°C | 11.4°C | 5.8°C | 25.6°C | -5.2°C | 40 mm | 79% | 3.9 m/s | 4.9 |
| 1984 | 13.3°C | 8.0°C | 2.8°C | 25.9°C | -3.2°C | 93 mm | 81% | 4.3 m/s | 4.1 |
| 1983 | 12.5°C | 7.0°C | 1.5°C | 21.1°C | -4.4°C | 154 mm | 81% | 3.8 m/s | — |
| 1982 | 13.0°C | 6.4°C | -0.3°C | 22.0°C | -9.7°C | 88 mm | 75% | 4.1 m/s | — |
| 1981 | 17.6°C | 10.5°C | 3.5°C | 26.6°C | -4.9°C | 172 mm | 74% | 4.5 m/s | — |
Actual recorded April data for each year, 1981–2025 — sourced from NASA POWER.
The average high in April is around 15.6°C with lows near 3.1°C (mean 9.4°C), based on 45 years of NASA POWER data.
April averages 91 mm of rainfall in Joliet, a relatively wet time of year. The wettest on record was 195 mm in 2013.
The hottest April reached 28.7°C in 2003. The coldest dipped to -9.7°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 14.7°C to 16.3°C and overnight lows from 2.7°C to 3.6°C over the same span.
April is close to Joliet's year-round average and a relatively wet time of year, so plan for around 15.6°C daytime highs and 3.1°C at night.
Not quite — April is the 6th coolest month in Joliet, averaging 9.4°C.
For April in Joliet, pack warm layers and a jacket for chilly mornings, with typical highs of 15.6°C and lows of 3.1°C. Bring an umbrella or light rain jacket too.
Relative humidity in April averages 75% — 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 2013 with 195 mm. On average, April sees 91 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 Joliet 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.
