| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | -0.2° | -8.3° | 55.3mm | 10.7 | 9 |
| February | 2.3° | -6.9° | 52.4mm | 9.4 | 13 |
| March | 9.1° | -1.1° | 74.7mm | 11.4 | 38 |
| April | 16.1° | 4.5° | 105.6mm | 12.4 | 63 |
| May | 22.2° | 10.5° | 123.2mm | 13.3 | 73 |
| June | 27.2° | 15.8° | 119.3mm | 11.4 | 76 |
| July | 28.9° | 18.2° | 109.2mm | 10.1 | 72 |
| August | 28° | 17.3° | 110.4mm | 9.6 | 77 |
| September | 24.8° | 13.4° | 81.7mm | 8.3 | 83 |
| October | 17.5° | 6.6° | 94mm | 10.6 | 71 |
| November | 9.7° | 0.3° | 57.6mm | 9 | 46 |
| December | 2.7° | -5.3° | 58.8mm | 10.7 | 13 |
January in Bolingbrook averages a daily high of -0.2°C with nights around -8.3°C. Expect roughly 10.7 wet days totalling 55.3mm. A hard month to visit for comfort alone.
February in Bolingbrook averages a daily high of 2.3°C with nights around -6.9°C. Expect roughly 9.4 wet days totalling 52.4mm. A hard month to visit for comfort alone.
March in Bolingbrook averages a daily high of 9.1°C with nights around -1.1°C. Expect roughly 11.4 wet days totalling 74.7mm. Demanding conditions — pack for it and plan indoor options.
April in Bolingbrook averages a daily high of 16.1°C with nights around 4.5°C. Expect roughly 12.4 wet days totalling 105.6mm. Generally workable, with some weather to plan around.
May in Bolingbrook averages a daily high of 22.2°C with nights around 10.5°C. Expect roughly 13.3 wet days totalling 123.2mm. Generally workable, with some weather to plan around.
June in Bolingbrook averages a daily high of 27.2°C with nights around 15.8°C. Expect roughly 11.4 wet days totalling 119.3mm. Comfortable conditions for being outdoors all day.
July in Bolingbrook averages a daily high of 28.9°C with nights around 18.2°C. Expect roughly 10.1 wet days totalling 109.2mm. Generally workable, with some weather to plan around.
August in Bolingbrook averages a daily high of 28°C with nights around 17.3°C. Expect roughly 9.6 wet days totalling 110.4mm. Comfortable conditions for being outdoors all day.
September in Bolingbrook averages a daily high of 24.8°C with nights around 13.4°C. Expect roughly 8.3 wet days totalling 81.7mm. Comfortable conditions for being outdoors all day.
October in Bolingbrook averages a daily high of 17.5°C with nights around 6.6°C. Expect roughly 10.6 wet days totalling 94mm. Generally workable, with some weather to plan around.
November in Bolingbrook averages a daily high of 9.7°C with nights around 0.3°C. Expect roughly 9 wet days totalling 57.6mm. Demanding conditions — pack for it and plan indoor options.
December in Bolingbrook averages a daily high of 2.7°C with nights around -5.3°C. Expect roughly 10.7 wet days totalling 58.8mm. A hard month to visit for comfort alone.
Each month scores out of 100. It starts at 100 and loses points for daytime highs outside a 20–27°C band, for wet days, and for nights below 2°C. Nothing else is weighted in — no crowd data, no prices, no opinion. Bolingbrook peaks at 83.
Based on 30 years of records, August–September scores highest for comfort in Bolingbrook, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 28.9°C.
May is the wettest, averaging 123.2mm of rain across roughly 13.3 wet days.
January is the coolest month, with average daily highs around -0.2°C.