July is one of the warmer months of the year in Waukegan, with average highs near 27.7°C and lows around 17.2°C (mean 22.5°C). It is a relatively wet time of year, averaging 103 mm of rainfall and 74% relative humidity across the period.
July is one of the warmer months of the year in Waukegan. Across 45 years of records, the warmest July in Waukegan was 2012 — when the month averaged 27.3°C — while the coldest was 2009 at 19°C. Typical July days reach 27.7°C with nights near 17.2°C. The long-term July temperature trend is broadly flat.
July is a relatively wet time of year in Waukegan, averaging 103 mm of rainfall. The wettest July on record was 2010 with 208 mm, while the driest was 2002 at 43 mm.
Relative humidity in Waukegan during July averages 74%. The most humid July was 1993 at 85%, and the least humid was 1988 at 55%.
July receives about 5.9 kWh/m²/day of solar energy in Waukegan. The sunniest July was 2019 at 6.5 kWh/m²/day, and the cloudiest was 1992 at 4.4.
Average wind speed in Waukegan during July is 2.6 m/s. The windiest July was 1990 at 3.1 m/s, while the calmest was 2024 at 2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 22.8°C | 21.7°C | 22.2°C | 22.7°C | 23.1°C | +0.3°C |
| Avg High | 28.3°C | 27.0°C | 27.7°C | 27.7°C | 28.2°C | -0.1°C |
| Avg Low | 17.2°C | 16.5°C | 16.7°C | 17.8°C | 17.9°C | +0.7°C |
| Avg Rain | 109 mm | 93 mm | 87 mm | 111 mm | 128 mm | +19 mm |
July temperatures in Waukegan have risen by about 0.9°C between 1981–1985 and 2021–2025.
July has ranged from a record low of 8.7°C (2001) to a record high of 39.8°C (2012).
Rainfall in July is a relatively wet time of year, averaging 103 mm, with a wettest year of 208 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0°C per decade while lows rose 0.2°C per decade, narrowing the gap between day and night.
One of the best times to visit Waukegan
July is one of the best times to visit Waukegan. Expect days averaging 27.7°C and nights around 17.2°C (mean 22.5°C) — warmer than Waukegan's yearly average — with higher rainfall (103 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 | 28.8°C | 23.9°C | 19.0°C | 33.6°C | 14.4°C | 142 mm | 75% | 2.4 m/s | 5.6 |
| 2024 | 26.9°C | 22.1°C | 17.3°C | 30.6°C | 11.2°C | 148 mm | 78% | 2 m/s | 5.9 |
| 2023 | 28.9°C | 23.2°C | 17.6°C | 33.5°C | 14.2°C | 125 mm | 67% | 2.2 m/s | 6 |
| 2022 | 28.0°C | 22.6°C | 17.2°C | 32.1°C | 14.3°C | 140 mm | 73% | 2.7 m/s | 6.1 |
| 2021 | 28.9°C | 23.2°C | 17.4°C | 34.6°C | 12.8°C | 54 mm | 69% | 2.7 m/s | 5.5 |
| 2020 | 27.7°C | 23.3°C | 18.9°C | 31.0°C | 15.3°C | 157 mm | 80% | 2.3 m/s | 6.4 |
| 2019 | 27.1°C | 22.8°C | 18.4°C | 30.8°C | 13.6°C | 87 mm | 82% | 2.5 m/s | 6.5 |
| 2018 | 26.8°C | 21.9°C | 17.1°C | 30.5°C | 13.2°C | 65 mm | 78% | 2.3 m/s | 6.4 |
| 2017 | 26.1°C | 21.4°C | 16.8°C | 29.5°C | 11.2°C | 193 mm | 82% | 2.3 m/s | 6.1 |
| 2016 | 28.3°C | 23.5°C | 18.6°C | 32.0°C | 13.5°C | 104 mm | 76% | 2.5 m/s | 5.9 |
| 2015 | 26.9°C | 21.5°C | 16.2°C | 31.8°C | 9.0°C | 98 mm | 75% | 2.5 m/s | 6 |
| 2014 | 24.7°C | 19.5°C | 14.4°C | 29.5°C | 9.5°C | 68 mm | 77% | 2.6 m/s | 6.1 |
| 2013 | 25.5°C | 20.9°C | 16.3°C | 31.5°C | 9.6°C | 76 mm | 82% | 2.4 m/s | 5.8 |
| 2012 🔥 | 33.6°C | 27.3°C | 20.9°C | 39.8°C | 16.5°C | 78 mm | 58% | 2.6 m/s | 6.2 |
| 2011 | 29.6°C | 24.8°C | 20.0°C | 35.4°C | 15.3°C | 135 mm | 76% | 2.3 m/s | 6 |
| 2010 🌧️ | 28.0°C | 23.5°C | 18.9°C | 30.2°C | 12.8°C | 208 mm | 81% | 2.6 m/s | 6.2 |
| 2009 ❄️ | 23.9°C | 19.0°C | 14.1°C | 27.4°C | 11.0°C | 58 mm | 79% | 2.5 m/s | 5.5 |
| 2008 | 26.1°C | 21.3°C | 16.5°C | 29.1°C | 10.0°C | 134 mm | 81% | 2.7 m/s | 6.1 |
| 2007 | 27.9°C | 22.2°C | 16.4°C | 33.4°C | 11.7°C | 108 mm | 69% | 2.6 m/s | 6.3 |
| 2006 | 29.5°C | 23.9°C | 18.3°C | 37.1°C | 13.9°C | 79 mm | 71% | 2.7 m/s | 5.7 |
| 2005 | 30.3°C | 24.1°C | 17.9°C | 38.3°C | 12.6°C | 67 mm | 64% | 2.7 m/s | 5.9 |
| 2004 | 25.2°C | 20.5°C | 15.7°C | 29.4°C | 11.0°C | 66 mm | 80% | 2.6 m/s | 5.6 |
| 2003 | 28.6°C | 22.4°C | 16.2°C | 34.1°C | 12.4°C | 125 mm | 66% | 2.7 m/s | 6 |
| 2002 | 30.5°C | 24.7°C | 18.9°C | 36.7°C | 13.9°C | 43 mm | 66% | 2.7 m/s | 6.3 |
| 2001 | 29.6°C | 23.6°C | 17.5°C | 34.3°C | 8.7°C | 62 mm | 66% | 2.3 m/s | 6.2 |
| 2000 | 25.3°C | 20.6°C | 15.8°C | 28.8°C | 12.1°C | 125 mm | 78% | 2.6 m/s | 5.7 |
| 1999 | 29.1°C | 24.0°C | 18.8°C | 34.2°C | 12.1°C | 84 mm | 77% | 2.9 m/s | 6.1 |
| 1998 | 27.4°C | 22.1°C | 16.8°C | 32.3°C | 13.3°C | 61 mm | 73% | 2.4 m/s | 6.3 |
| 1997 | 27.5°C | 21.9°C | 16.2°C | 32.9°C | 10.9°C | 68 mm | 72% | 2.8 m/s | 6 |
| 1996 | 24.3°C | 19.2°C | 14.2°C | 28.8°C | 9.7°C | 110 mm | 78% | 2.5 m/s | 5.6 |
| 1995 | 28.8°C | 23.5°C | 18.1°C | 33.8°C | 11.5°C | 100 mm | 72% | 2.8 m/s | 5.9 |
| 1994 | 26.8°C | 21.5°C | 16.2°C | 30.6°C | 11.1°C | 90 mm | 75% | 2.8 m/s | 5.9 |
| 1993 | 25.4°C | 21.2°C | 16.9°C | 29.2°C | 13.1°C | 115 mm | 85% | 2.9 m/s | 5.6 |
| 1992 | 24.9°C | 19.7°C | 14.6°C | 31.6°C | 12.2°C | 145 mm | 76% | 2.7 m/s | 4.4 |
| 1991 | 29.5°C | 23.4°C | 17.4°C | 35.8°C | 12.1°C | 55 mm | 65% | 2.8 m/s | 6.2 |
| 1990 | 26.0°C | 20.8°C | 15.6°C | 31.8°C | 11.5°C | 98 mm | 76% | 3.1 m/s | 5.3 |
| 1989 | 28.9°C | 23.1°C | 17.3°C | 37.1°C | 12.9°C | 161 mm | 69% | 2.5 m/s | 5.7 |
| 1988 | 31.9°C | 24.7°C | 17.6°C | 37.6°C | 10.2°C | 56 mm | 55% | 2.4 m/s | 5.8 |
| 1987 | 29.6°C | 24.3°C | 19.0°C | 34.8°C | 11.9°C | 123 mm | 72% | 2.5 m/s | 5.3 |
| 1986 | 27.2°C | 22.2°C | 17.3°C | 31.1°C | 10.1°C | 123 mm | 81% | 2.6 m/s | 5.4 |
| 1985 | 28.0°C | 22.0°C | 16.1°C | 34.7°C | 11.9°C | 100 mm | 67% | 2.8 m/s | 5.5 |
| 1984 | 26.6°C | 20.9°C | 15.3°C | 32.4°C | 8.8°C | 72 mm | 71% | 2.6 m/s | 5.2 |
| 1983 | 28.0°C | 23.4°C | 18.9°C | 31.8°C | 10.1°C | 88 mm | 80% | 2.4 m/s | — |
| 1982 | 26.7°C | 21.7°C | 16.6°C | 29.6°C | 10.6°C | 182 mm | 80% | 2.7 m/s | — |
| 1981 | 28.0°C | 22.5°C | 16.9°C | 33.6°C | 10.3°C | 74 mm | 70% | 2.5 m/s | — |
Actual recorded July data for each year, 1981–2025 — sourced from NASA POWER.
The average high in July is around 27.7°C with lows near 17.2°C (mean 22.5°C), based on 45 years of NASA POWER data.
July averages 103 mm of rainfall in Waukegan, a relatively wet time of year. The wettest on record was 208 mm in 2010.
The hottest July reached 39.8°C in 2012. The coldest dipped to 8.7°C in 2001.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average July temperatures have risen by about 0.9°C. Daytime highs moved from 27.5°C to 28.3°C and overnight lows from 16.8°C to 17.7°C over the same span.
July is one of the warmer months of the year in Waukegan and a relatively wet time of year, so plan for around 27.7°C daytime highs and 17.2°C at night.
Not quite — July is the 12th coolest month in Waukegan, averaging 22.5°C.
For July in Waukegan, pack light layers you can adjust through the day, with typical highs of 27.7°C and lows of 17.2°C. Bring an umbrella or light rain jacket too.
Relative humidity in July averages 74% — moderately humid.
Average wind speed in July is 2.6 m/s. The windiest July on record averaged 3.1 m/s (1990).
The wettest July on record was 2010 with 208 mm. On average, July sees 103 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 Waukegan 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.
