July is one of the warmer months of the year in Chicago Heights, with average highs near 27.8°C and lows around 17.9°C (mean 22.9°C). It is a relatively wet time of year, averaging 105 mm of rainfall and 75% relative humidity across the period.
July is one of the warmer months of the year in Chicago Heights. Across 45 years of records, the warmest July in Chicago Heights was 2012 — when the month averaged 27.3°C — while the coldest was 1996 at 19.6°C. Typical July days reach 27.8°C with nights near 17.9°C. The long-term trend is warming, about 0.4°C per decade.
July is a relatively wet time of year in Chicago Heights, averaging 105 mm of rainfall. The wettest July on record was 2003 with 221 mm, while the driest was 1991 at 29 mm.
Relative humidity in Chicago Heights during July averages 75%. The most humid July was 1993 at 86%, and the least humid was 1988 at 57%.
July receives about 6 kWh/m²/day of solar energy in Chicago Heights. The sunniest Julys were 2007 and 2019 at 6.6 kWh/m²/day, and the cloudiest was 1992 at 4.6.
Average wind speed in Chicago Heights during July is 2.4 m/s. The windiest July was 1990 at 2.8 m/s, while the calmest was 2023 at 2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 22.5°C | 22.0°C | 22.8°C | 23.5°C | 23.9°C | +1.4°C |
| Avg High | 27.7°C | 26.9°C | 28.0°C | 28.2°C | 28.8°C | +1.1°C |
| Avg Low | 17.4°C | 17.1°C | 17.7°C | 18.7°C | 18.9°C | +1.5°C |
| Avg Rain | 100 mm | 108 mm | 106 mm | 99 mm | 116 mm | +15 mm |
July temperatures in Chicago Heights have risen by about 2°C between 1981–1985 and 2021–2025.
July has ranged from a record low of 8.8°C (1983) to a record high of 39.5°C (2012).
Rainfall in July is a relatively wet time of year, averaging 105 mm, with a wettest year of 221 mm.
One of the best times to visit Chicago Heights
July is one of the best times to visit Chicago Heights. Expect days averaging 27.8°C and nights around 17.9°C (mean 22.9°C) — warmer than Chicago Heights's yearly average — with higher rainfall (105 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 30.5°C | 25.5°C | 20.5°C | 33.8°C | 17.8°C | 131 mm | 71% | 2.2 m/s | 5.7 |
| 2024 | 28.2°C | 23.2°C | 18.1°C | 31.3°C | 12.1°C | 131 mm | 72% | 2.1 m/s | 6 |
| 2023 | 28.9°C | 23.6°C | 18.2°C | 35.0°C | 14.9°C | 163 mm | 68% | 2 m/s | 6.2 |
| 2022 | 28.8°C | 23.6°C | 18.5°C | 33.0°C | 14.9°C | 128 mm | 71% | 2.5 m/s | 5.9 |
| 2021 | 27.3°C | 22.8°C | 18.2°C | 31.8°C | 13.3°C | 60 mm | 76% | 2.5 m/s | 5.4 |
| 2020 | 29.2°C | 24.5°C | 19.8°C | 32.8°C | 16.4°C | 81 mm | 75% | 2.3 m/s | 6.4 |
| 2019 | 28.0°C | 23.6°C | 19.3°C | 31.5°C | 14.0°C | 92 mm | 81% | 2.4 m/s | 6.6 |
| 2018 | 27.9°C | 23.0°C | 18.1°C | 31.3°C | 13.1°C | 66 mm | 75% | 2.4 m/s | 6.4 |
| 2017 | 27.7°C | 23.1°C | 18.4°C | 31.1°C | 14.5°C | 144 mm | 78% | 2.3 m/s | 6.2 |
| 2016 | 28.6°C | 24.1°C | 19.6°C | 31.9°C | 14.4°C | 156 mm | 75% | 2.3 m/s | 5.9 |
| 2015 | 26.7°C | 21.9°C | 17.2°C | 31.0°C | 12.0°C | 95 mm | 79% | 2.3 m/s | 5.8 |
| 2014 | 25.1°C | 20.3°C | 15.4°C | 29.0°C | 11.3°C | 63 mm | 75% | 2.6 m/s | 6.3 |
| 2013 | 27.0°C | 22.3°C | 17.7°C | 32.6°C | 11.3°C | 40 mm | 77% | 2.5 m/s | 5.9 |
| 2012 🔥 | 33.5°C | 27.3°C | 21.2°C | 39.5°C | 16.6°C | 74 mm | 60% | 2.4 m/s | 6.4 |
| 2011 | 29.2°C | 24.9°C | 20.6°C | 34.8°C | 16.2°C | 113 mm | 79% | 2.2 m/s | 6.1 |
| 2010 | 28.7°C | 24.2°C | 19.7°C | 31.8°C | 11.8°C | 146 mm | 79% | 2.5 m/s | 6.3 |
| 2009 | 24.7°C | 20.1°C | 15.4°C | 28.2°C | 12.6°C | 70 mm | 77% | 2.4 m/s | 5.5 |
| 2008 | 27.4°C | 22.5°C | 17.6°C | 30.6°C | 12.6°C | 101 mm | 78% | 2.6 m/s | 6.5 |
| 2007 | 27.6°C | 22.3°C | 17.1°C | 32.1°C | 11.9°C | 105 mm | 71% | 2.5 m/s | 6.6 |
| 2006 | 29.1°C | 24.3°C | 19.4°C | 34.2°C | 13.7°C | 137 mm | 74% | 2.5 m/s | 5.8 |
| 2005 | 31.0°C | 25.0°C | 19.0°C | 39.0°C | 13.8°C | 82 mm | 65% | 2.5 m/s | 6.2 |
| 2004 | 27.1°C | 22.3°C | 17.5°C | 30.3°C | 13.2°C | 83 mm | 75% | 2.6 m/s | 5.7 |
| 2003 🌧️ | 27.6°C | 22.2°C | 16.7°C | 33.2°C | 12.5°C | 221 mm | 73% | 2.6 m/s | 6.1 |
| 2002 | 29.9°C | 24.6°C | 19.4°C | 33.7°C | 13.1°C | 62 mm | 70% | 2.4 m/s | 6.3 |
| 2001 | 29.2°C | 23.6°C | 18.0°C | 34.7°C | 9.1°C | 96 mm | 68% | 2.1 m/s | 6.3 |
| 2000 | 26.5°C | 21.5°C | 16.6°C | 29.5°C | 12.6°C | 105 mm | 75% | 2.5 m/s | 5.7 |
| 1999 | 30.2°C | 25.1°C | 19.9°C | 36.7°C | 13.7°C | 82 mm | 72% | 2.7 m/s | 6.4 |
| 1998 | 27.4°C | 22.5°C | 17.7°C | 32.2°C | 14.4°C | 97 mm | 75% | 2.2 m/s | 6.4 |
| 1997 | 27.5°C | 22.2°C | 16.8°C | 34.8°C | 10.9°C | 83 mm | 75% | 2.6 m/s | 6.2 |
| 1996 ❄️ | 24.6°C | 19.6°C | 14.6°C | 29.0°C | 9.1°C | 208 mm | 78% | 2.4 m/s | 5.9 |
| 1995 | 27.9°C | 23.1°C | 18.3°C | 31.7°C | 11.6°C | 90 mm | 77% | 2.4 m/s | 6.2 |
| 1994 | 25.9°C | 21.3°C | 16.7°C | 28.8°C | 11.4°C | 101 mm | 80% | 2.5 m/s | 5.7 |
| 1993 | 26.1°C | 22.1°C | 18.1°C | 29.0°C | 14.2°C | 101 mm | 86% | 2.7 m/s | 5.5 |
| 1992 | 25.4°C | 20.5°C | 15.6°C | 31.8°C | 12.4°C | 166 mm | 79% | 2.7 m/s | 4.6 |
| 1991 | 28.6°C | 23.3°C | 17.9°C | 35.2°C | 14.0°C | 29 mm | 68% | 2.7 m/s | 6.5 |
| 1990 | 25.2°C | 20.5°C | 15.7°C | 31.4°C | 11.5°C | 123 mm | 79% | 2.8 m/s | 5.6 |
| 1989 | 27.6°C | 22.7°C | 17.7°C | 34.3°C | 14.4°C | 123 mm | 75% | 2.3 m/s | 5.8 |
| 1988 | 31.7°C | 25.0°C | 18.4°C | 37.3°C | 12.1°C | 59 mm | 57% | 2.2 m/s | 6.1 |
| 1987 | 28.8°C | 23.8°C | 18.9°C | 33.5°C | 12.2°C | 99 mm | 76% | 2.4 m/s | 5.7 |
| 1986 | 27.2°C | 22.3°C | 17.4°C | 30.7°C | 11.1°C | 101 mm | 81% | 2.6 m/s | 6 |
| 1985 | 27.7°C | 21.9°C | 16.1°C | 32.8°C | 10.1°C | 91 mm | 69% | 2.7 m/s | 5.8 |
| 1984 | 25.7°C | 20.4°C | 15.2°C | 30.4°C | 10.1°C | 64 mm | 73% | 2.4 m/s | 5.8 |
| 1983 | 27.5°C | 23.1°C | 18.8°C | 31.3°C | 8.8°C | 96 mm | 80% | 2.4 m/s | — |
| 1982 | 26.3°C | 21.6°C | 16.9°C | 29.6°C | 9.7°C | 138 mm | 81% | 2.6 m/s | — |
| 1981 | 26.4°C | 21.7°C | 16.9°C | 31.6°C | 12.2°C | 134 mm | 79% | 2.4 m/s | — |
Actual recorded July data for each year, 1981–2025 — sourced from NASA POWER.
The average high in July is around 27.8°C with lows near 17.9°C (mean 22.9°C), based on 45 years of NASA POWER data.
July averages 105 mm of rainfall in Chicago Heights, a relatively wet time of year. The wettest on record was 221 mm in 2003.
The hottest July reached 39.5°C in 2012. The coldest dipped to 8.8°C in 1983.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average July temperatures have risen by about 2°C. Daytime highs moved from 26.7°C to 28.7°C and overnight lows from 16.8°C to 18.7°C over the same span.
July is one of the warmer months of the year in Chicago Heights and a relatively wet time of year, so plan for around 27.8°C daytime highs and 17.9°C at night.
Not quite — July is the 12th coolest month in Chicago Heights, averaging 22.9°C.
For July in Chicago Heights, pack light layers you can adjust through the day, with typical highs of 27.8°C and lows of 17.9°C. Bring an umbrella or light rain jacket too.
Relative humidity in July averages 75% — moderately humid.
Average wind speed in July is 2.4 m/s. The windiest July on record averaged 2.8 m/s (1990).
The wettest July on record was 2003 with 221 mm. On average, July sees 105 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 July, 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 July specifically, along with year-by-year records and how the month has changed over the decades.
