Bolingbrook, Illinois Weather
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Climate of Bolingbrook: monthly averages
Based on 25 years of satellite and reanalysis data (2001-2025), July is usually the hottest month in Bolingbrook, with average daytime highs around 29°C. January is the coolest, when nights typically fall to about -9°C and frost is possible on the coldest nights. That is a wide yearly range of roughly 38°C, so the seasons feel very different from each other.
The area receives about 980 mm of rain in a typical year. Most of it falls from May to August, and May is the wettest month at roughly 117 mm.
For outdoor plans and travel, September usually offers the most comfortable weather in Bolingbrook, with mild days and relatively little rain.
| Month | Avg high | Avg low | Rainfall | Humidity |
|---|---|---|---|---|
| Jan | 0° | -9° | 48 mm | 85% |
| Feb | 2° | -8° | 51 mm | 83% |
| Mar | 9° | -2° | 64 mm | 79% |
| Apr | 16° | 3° | 95 mm | 75% |
| May | 22° | 10° | 117 mm | 76% |
| Jun | 27° | 16° | 113 mm | 77% |
| Jul | 29° | 18° | 100 mm | 75% |
| Aug | 28° | 17° | 105 mm | 74% |
| Sep | 25° | 13° | 85 mm | 74% |
| Oct | 17° | 6° | 89 mm | 75% |
| Nov | 9° | -1° | 60 mm | 79% |
| Dec | 2° | -6° | 57 mm | 86% |
Source: NASA POWER (MERRA-2 reanalysis), averaged over the roughly 50 km grid area around Bolingbrook. Values describe typical conditions, not a forecast.
About Bolingbrook weather
Bolingbrook is one of many towns in Illinois's humid continental climate, shaped by its Great Lakes and prairie geography, about 41 km south-west of Chicago. Before the rains arrive, there's warm, humid summers (June–August). Cooler months mean cold winters (December–February) with regular snow, colder near Lake Michigan. This page shows live, auto-refreshing weather for Bolingbrook: current conditions, an hourly breakdown, a 16-day outlook, a date-lookup tool for any past or future date, and real-time air quality, sourced from Open-Meteo. Local timezone: America/Chicago.
Frequently asked questions
Bolingbrook is about 41 km south-west of Chicago, in Illinois.
Bolingbrook sees cold winters (December–February) with regular snow, colder near Lake Michigan.
The live current conditions, hourly forecast and 16-day outlook above are pulled in real time for Bolingbrook's exact coordinates. No fixed schedule, the page updates whenever you load it.
July is usually the hottest month in Bolingbrook, with average daytime highs of about 29°C and nights around 18°C.
The coldest nights come in January, when the average low is about -9°C and daytime highs reach around 0°C. Frost is possible on clear, calm nights.
Bolingbrook receives about 980 mm of rain in a typical year. May is the wettest month at roughly 117 mm, and the main rainy period is May to August.
September usually offers the most comfortable weather in Bolingbrook, with mild daytime temperatures and little rain.
In November Bolingbrook typically sees daytime highs near 9°C and lows near -1°C, with about 60 mm of rain over the month and average humidity around 79%. Check the live forecast above for this week's actual conditions.
Up to 16 days ahead using the extended forecast and date picker above; further-out or historical dates use the same date lookup tool.
Live temperature for Bolingbrook is shown at the top of this page and refreshes automatically — see the hourly breakdown below for how it changes through the day.
Bolingbrook's day-to-day weather follows the broader pattern of Illinois described above. See the hourly weather forecast or the air quality index for more detail.