Weather in Oak Brook, IL
Oak Brook, Sunday, 11 October, 03:37
Mostly clear. Feels like 57°. High 77°, low 58°.
Monthly outlook for Oak Brook, IL: average high 63.1°, average low 49.5°. That is 1.6° above the climate normal for October. Precipitation is expected on 3 days (about 1.1 inches), against a normal of 5 days and 1.8 inches. The warmest day looks like 12 October (85.2°), the coolest 18 October (34.3°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 11 October – 20 October | 63.7° | 61.2° | +1.4° |
| 21 October – 30 October | 62.1° | 57.6° | +2.5° |
| 31 October – 9 November | at normal | 53.2° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — La Grange Park (4 mi).
0
Oak Brook, Monday, 12 October
Partly cloudy. High 85°, low 66°.
0.01
Oak Brook, Tuesday, 13 October
Light rain. High 79°, low 66°.
0.25Oak Brook, Wednesday, 14 October
Rain. High 67°, low 58°.
0.56Oak Brook, Thursday, 15 October
Rain. High 57°, low 54°.
0.02Oak Brook, Friday, 16 October
Light rain. High 58°, low 44°.
0.01
Oak Brook, Saturday, 17 October
Light snow. High 44°, low 35°.
0
Oak Brook, Sunday, 18 October
Clear. High 47°, low 34°.
0Oak Brook, Monday, 19 October
Partly cloudy. High 57°, low 39°.
0Oak Brook, Tuesday, 20 October
Clear. High 64°, low 45°.
0Oak Brook, Wednesday, 21 October
Clear. High 68°, low 51°.
0Oak Brook, Thursday, 22 October
Partly cloudy. High 70°, low 57°.
0
Oak Brook, Friday, 23 October
Mostly clear. High 65°, low 52°.
0.25Oak Brook, Saturday, 24 October
Rain. High 60°, low 48°.
0
Oak Brook, Sunday, 25 October
Overcast. High 51°, low 42°.
0Oak Brook, Monday, 26 October
Clear. High 57°, low 44°.
0.1
Oak Brook, Tuesday, 27 October
Climate normal for this date — 60-year average.
0.06Oak Brook, Wednesday, 28 October
Climate normal for this date — 60-year average.
0.06Oak Brook, Thursday, 29 October
Climate normal for this date — 60-year average.
0.12Oak Brook, Friday, 30 October
Climate normal for this date — 60-year average.
0.13Oak Brook, Saturday, 31 October
Climate normal for this date — 60-year average.
0.18Oak Brook, Sunday, 1 November
Climate normal for this date — 60-year average.
0.12Oak 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.
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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