July is one of the warmer months of the year in Bolingbrook, with average highs near 28.4°C and lows around 17.7°C (mean 23°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 Bolingbrook. Across 45 years of records, the warmest July in Bolingbrook was 2012 — when the month averaged 28°C — while the coldest was 2009 at 19.8°C. Typical July days reach 28.4°C with nights near 17.7°C. The long-term trend is warming, about 0.2°C per decade.
July is a relatively wet time of year in Bolingbrook, averaging 105 mm of rainfall. The wettest July on record was 1996 with 210 mm, while the driest was 1991 at 25 mm.
Relative humidity in Bolingbrook during July averages 75%. The most humid July was 1993 at 86%, and the least humid was 1988 at 54%.
July receives about 6.1 kWh/m²/day of solar energy in Bolingbrook. The sunniest July was 2019 at 6.7 kWh/m²/day, and the cloudiest was 1992 at 4.6.
Average wind speed in Bolingbrook during July is 2.3 m/s. The windiest July was 1990 at 2.7 m/s, while the calmest was 2023 at 1.8 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 23.2°C | 22.3°C | 23.0°C | 23.4°C | 23.7°C | +0.5°C |
| Avg High | 28.7°C | 27.6°C | 28.6°C | 28.4°C | 28.9°C | +0.2°C |
| Avg Low | 17.6°C | 17.0°C | 17.3°C | 18.3°C | 18.4°C | +0.8°C |
| Avg Rain | 103 mm | 104 mm | 104 mm | 99 mm | 123 mm | +20 mm |
July temperatures in Bolingbrook have risen by about 1.3°C between 1981–1985 and 2021–2025.
July has ranged from a record low of 8.9°C (2001) to a record high of 40.8°C (2005).
Rainfall in July is a relatively wet time of year, averaging 105 mm, with a wettest year of 210 mm.
One of the best times to visit Bolingbrook
July is one of the best times to visit Bolingbrook. Expect days averaging 28.4°C and nights around 17.7°C (mean 23°C) — warmer than Bolingbrook'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 | 30.8°C | 25.4°C | 20.1°C | 34.5°C | 15.6°C | 140 mm | 72% | 2.1 m/s | 5.7 |
| 2024 | 28.2°C | 22.9°C | 17.7°C | 31.1°C | 11.0°C | 127 mm | 74% | 1.9 m/s | 6 |
| 2023 | 29.2°C | 23.6°C | 17.9°C | 35.4°C | 13.7°C | 167 mm | 70% | 1.8 m/s | 6.3 |
| 2022 | 28.7°C | 23.2°C | 17.8°C | 33.3°C | 13.9°C | 134 mm | 74% | 2.3 m/s | 5.9 |
| 2021 | 27.8°C | 22.9°C | 17.9°C | 32.7°C | 13.1°C | 64 mm | 77% | 2.3 m/s | 5.4 |
| 2020 | 28.8°C | 24.0°C | 19.1°C | 32.0°C | 15.5°C | 105 mm | 79% | 2.1 m/s | 6.5 |
| 2019 | 28.5°C | 23.8°C | 19.1°C | 31.9°C | 13.4°C | 89 mm | 82% | 2.2 m/s | 6.7 |
| 2018 | 27.8°C | 22.6°C | 17.4°C | 31.6°C | 13.0°C | 62 mm | 78% | 2.2 m/s | 6.5 |
| 2017 | 27.7°C | 22.7°C | 17.8°C | 30.7°C | 12.6°C | 154 mm | 80% | 2.1 m/s | 6.3 |
| 2016 | 28.0°C | 23.6°C | 19.2°C | 30.8°C | 13.3°C | 169 mm | 80% | 2 m/s | 6 |
| 2015 | 26.9°C | 21.9°C | 16.8°C | 31.6°C | 11.2°C | 105 mm | 80% | 2.2 m/s | 5.8 |
| 2014 | 25.3°C | 20.1°C | 15.0°C | 29.2°C | 10.4°C | 78 mm | 77% | 2.4 m/s | 6.4 |
| 2013 | 26.7°C | 21.8°C | 16.9°C | 31.7°C | 10.5°C | 42 mm | 80% | 2.2 m/s | 6.1 |
| 2012 🔥 | 34.9°C | 28.0°C | 21.0°C | 40.2°C | 16.8°C | 57 mm | 56% | 2.3 m/s | 6.5 |
| 2011 | 29.6°C | 25.0°C | 20.4°C | 34.0°C | 15.3°C | 99 mm | 80% | 2 m/s | 6.3 |
| 2010 | 28.8°C | 24.0°C | 19.2°C | 31.6°C | 11.2°C | 136 mm | 81% | 2.3 m/s | 6.3 |
| 2009 ❄️ | 24.7°C | 19.8°C | 14.8°C | 28.3°C | 11.5°C | 81 mm | 80% | 2.2 m/s | 5.4 |
| 2008 | 27.4°C | 22.3°C | 17.1°C | 29.8°C | 10.9°C | 125 mm | 81% | 2.4 m/s | 6.5 |
| 2007 | 27.7°C | 22.0°C | 16.3°C | 32.2°C | 11.7°C | 120 mm | 73% | 2.3 m/s | 6.6 |
| 2006 | 30.3°C | 24.7°C | 19.0°C | 36.8°C | 13.8°C | 106 mm | 72% | 2.3 m/s | 5.9 |
| 2005 | 32.1°C | 25.3°C | 18.6°C | 40.8°C | 13.3°C | 87 mm | 63% | 2.4 m/s | 6.1 |
| 2004 | 27.5°C | 22.3°C | 17.1°C | 30.8°C | 12.2°C | 72 mm | 76% | 2.4 m/s | 5.7 |
| 2003 | 28.9°C | 22.8°C | 16.8°C | 35.2°C | 11.3°C | 186 mm | 71% | 2.4 m/s | 6.2 |
| 2002 | 30.3°C | 24.7°C | 19.2°C | 34.7°C | 13.3°C | 56 mm | 71% | 2.3 m/s | 6.4 |
| 2001 | 30.2°C | 24.1°C | 18.0°C | 35.6°C | 8.9°C | 82 mm | 68% | 2 m/s | 6.3 |
| 2000 | 27.0°C | 21.7°C | 16.3°C | 29.7°C | 11.2°C | 126 mm | 77% | 2.4 m/s | 5.7 |
| 1999 | 30.4°C | 25.0°C | 19.6°C | 38.4°C | 13.4°C | 67 mm | 74% | 2.5 m/s | 6.5 |
| 1998 | 27.6°C | 22.4°C | 17.2°C | 31.9°C | 13.4°C | 88 mm | 77% | 2 m/s | 6.5 |
| 1997 | 29.3°C | 23.1°C | 16.9°C | 36.9°C | 10.5°C | 53 mm | 70% | 2.5 m/s | 6.2 |
| 1996 🌧️ | 25.5°C | 20.1°C | 14.6°C | 30.5°C | 9.8°C | 210 mm | 77% | 2.3 m/s | 6 |
| 1995 | 27.8°C | 23.0°C | 18.1°C | 31.4°C | 11.2°C | 88 mm | 80% | 2.3 m/s | 6.5 |
| 1994 | 26.5°C | 21.5°C | 16.5°C | 29.9°C | 11.5°C | 98 mm | 81% | 2.4 m/s | 5.6 |
| 1993 | 26.8°C | 22.6°C | 18.3°C | 30.1°C | 14.4°C | 118 mm | 86% | 2.6 m/s | 5.3 |
| 1992 | 26.2°C | 20.9°C | 15.5°C | 32.6°C | 12.4°C | 173 mm | 79% | 2.5 m/s | 4.6 |
| 1991 | 29.5°C | 23.5°C | 17.6°C | 36.4°C | 12.8°C | 25 mm | 69% | 2.4 m/s | 6.5 |
| 1990 | 26.1°C | 21.0°C | 15.8°C | 32.2°C | 11.3°C | 120 mm | 80% | 2.7 m/s | 5.8 |
| 1989 | 29.1°C | 23.4°C | 17.7°C | 36.7°C | 14.5°C | 142 mm | 72% | 2.3 m/s | 5.9 |
| 1988 | 33.3°C | 25.9°C | 18.5°C | 39.7°C | 11.5°C | 53 mm | 54% | 2.1 m/s | 6.3 |
| 1987 | 30.2°C | 24.8°C | 19.3°C | 35.2°C | 11.9°C | 96 mm | 74% | 2.3 m/s | 5.9 |
| 1986 | 28.1°C | 23.0°C | 18.0°C | 31.4°C | 12.0°C | 96 mm | 81% | 2.4 m/s | 6 |
| 1985 | 28.3°C | 22.3°C | 16.2°C | 33.8°C | 10.7°C | 99 mm | 70% | 2.5 m/s | 5.9 |
| 1984 | 26.5°C | 21.0°C | 15.4°C | 31.4°C | 9.3°C | 61 mm | 74% | 2.2 m/s | 6.1 |
| 1983 | 28.4°C | 23.8°C | 19.2°C | 32.5°C | 9.2°C | 86 mm | 80% | 2.3 m/s | — |
| 1982 | 27.2°C | 22.3°C | 17.3°C | 30.1°C | 10.0°C | 176 mm | 82% | 2.5 m/s | — |
| 1981 | 27.0°C | 21.9°C | 16.8°C | 32.3°C | 10.1°C | 117 mm | 80% | 2.2 m/s | — |
Actual recorded July data for each year, 1981–2025 — sourced from NASA POWER.
The average high in July is around 28.4°C with lows near 17.7°C (mean 23°C), based on 45 years of NASA POWER data.
July averages 105 mm of rainfall in Bolingbrook, a relatively wet time of year. The wettest on record was 210 mm in 1996.
The hottest July reached 40.8°C in 2005. The coldest dipped to 8.9°C in 2001.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average July temperatures have risen by about 1.3°C. Daytime highs moved from 27.5°C to 28.9°C and overnight lows from 17°C to 18.3°C over the same span.
July is one of the warmer months of the year in Bolingbrook and a relatively wet time of year, so plan for around 28.4°C daytime highs and 17.7°C at night.
Not quite — July is the 12th coolest month in Bolingbrook, averaging 23°C.
For July in Bolingbrook, pack light layers you can adjust through the day, with typical highs of 28.4°C and lows of 17.7°C. Bring an umbrella or light rain jacket too.
Relative humidity in July averages 75% — quite humid.
Average wind speed in July is 2.3 m/s. The windiest July on record averaged 2.7 m/s (1990).
The wettest July on record was 1996 with 210 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 Bolingbrook 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.
