Weather in Oak Brook, IL
Oak Brook, Saturday, 17 October, 18:39
Clear. Feels like 50°. High 56°, low 36°.
Monthly outlook for Oak Brook, IL: average high 64.6°, average low 49.9°. That is 3.8° above the climate normal for October. Precipitation is expected on 4 days (about 2.1 inches), against a normal of 5 days and 1.7 inches. The warmest day looks like 25 October (74.2°), the coolest 17 October (35.7°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 17 October – 26 October | 65.9° | 58.8° | +4° |
| 27 October – 5 November | 62.4° | 54.9° | +4.2° |
| 6 November – 15 November | at normal | 49.5° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — La Grange Park (4 mi).
0
Oak Brook, Sunday, 18 October
Clear. High 64°, low 43°.
0
Oak Brook, Monday, 19 October
Partly cloudy. High 62°, low 42°.
0Oak Brook, Tuesday, 20 October
Partly cloudy. High 64°, low 48°.
0Oak Brook, Wednesday, 21 October
Clear. High 66°, low 45°.
0.01
Oak Brook, Thursday, 22 October
Light rain. High 65°, low 50°.
0
Oak Brook, Friday, 23 October
Overcast. High 71°, low 51°.
0Oak Brook, Saturday, 24 October
Overcast. High 71°, low 59°.
0Oak Brook, Sunday, 25 October
Overcast. High 74°, low 61°.
0.19Oak Brook, Monday, 26 October
Light rain. High 66°, low 56°.
0Oak Brook, Tuesday, 27 October
Partly cloudy. High 54°, low 50°.
0Oak Brook, Wednesday, 28 October
Overcast. High 57°, low 46°.
0.31Oak Brook, Thursday, 29 October
Rain. High 58°, low 46°.
0.3Oak Brook, Friday, 30 October
Light rain. High 68°, low 58°.
1.28Oak Brook, Saturday, 31 October
Heavy rain. High 68°, low 57°.
0Oak Brook, Sunday, 1 November
Partly cloudy. High 69°, low 52°.
0.12
Oak Brook, Monday, 2 November
Climate normal for this date — 60-year average.
0.07Oak Brook, Tuesday, 3 November
Climate normal for this date — 60-year average.
0.09Oak Brook, Wednesday, 4 November
Climate normal for this date — 60-year average.
0.12Oak Brook, Thursday, 5 November
Climate normal for this date — 60-year average.
0.07Oak Brook, Friday, 6 November
Climate normal for this date — 60-year average.
0.06Oak Brook, Saturday, 7 November
Climate normal for this date — 60-year average.
0.07Oak Brook, Sunday, 8 November
Climate normal for this date — 60-year average.
0.13Oak Brook, Monday, 9 November
Climate normal for this date — 60-year average.
0.13Oak Brook, Tuesday, 10 November
Climate normal for this date — 60-year average.
0.08Oak Brook, Wednesday, 11 November
Climate normal for this date — 60-year average.
0.06Oak Brook, Thursday, 12 November
Climate normal for this date — 60-year average.
0.05Oak Brook, Friday, 13 November
Climate normal for this date — 60-year average.
0.07Oak Brook, Saturday, 14 November
Climate normal for this date — 60-year average.
0.1Oak Brook, Sunday, 15 November
Climate normal for this date — 60-year average.
About the monthly outlook
How accurate is a 30-day forecast?
The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for Oak Brook, IL are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.
What does "above normal" mean?
We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.
Where do the 66-year records come from?
They are real temperature extremes recorded in Oak Brook, IL since 1960: the highest and lowest reading for each calendar date, with the year it happened.
How often is it updated?
The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.
Sun and moon today
Weather history
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