Weather in Northbrook, IL
Northbrook, Sunday, 11 October, 06:36
Clear. Feels like 57°. High 77°, low 57°.
Monthly outlook for Northbrook, IL: average high 62.9°, average low 49.5°. That is 2.8° above the climate normal for October. Precipitation is expected on 4 days (about 1.1 inches), against a normal of 5 days and 1.8 inches. The warmest day looks like 12 October (85°), the coolest 18 October (31.6°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 11 October – 20 October | 63.7° | 58.9° | +2.7° |
| 21 October – 30 October | 61.6° | 55.2° | +3.6° |
| 31 October – 9 November | at normal | 51.2° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Highwood (5 mi).
0
Northbrook, Monday, 12 October
Mostly clear. High 85°, low 66°.
0.03
Northbrook, Tuesday, 13 October
Light rain. High 78°, low 65°.
0.17Northbrook, Wednesday, 14 October
Rain. High 66°, low 59°.
0.49Northbrook, Thursday, 15 October
Rain. High 58°, low 55°.
0.06Northbrook, Friday, 16 October
Light rain. High 59°, low 43°.
0.01
Northbrook, Saturday, 17 October
Light snow. High 44°, low 34°.
0
Northbrook, Sunday, 18 October
Clear. High 48°, low 32°.
0
Northbrook, Monday, 19 October
Partly cloudy. High 58°, low 41°.
0Northbrook, Tuesday, 20 October
Clear. High 64°, low 47°.
0Northbrook, Wednesday, 21 October
Clear. High 68°, low 53°.
0Northbrook, Thursday, 22 October
Light rain. High 68°, low 56°.
0Northbrook, Friday, 23 October
Partly cloudy. High 64°, low 52°.
0.28Northbrook, Saturday, 24 October
Rain. High 61°, low 47°.
0
Northbrook, Sunday, 25 October
Overcast. High 52°, low 41°.
0.01Northbrook, Monday, 26 October
Light rain. High 56°, low 44°.
0.09Northbrook, Tuesday, 27 October
Climate normal for this date — 60-year average.
0.05Northbrook, Wednesday, 28 October
Climate normal for this date — 60-year average.
0.06Northbrook, Thursday, 29 October
Climate normal for this date — 60-year average.
0.1Northbrook, Friday, 30 October
Climate normal for this date — 60-year average.
0.13
Northbrook, Saturday, 31 October
Climate normal for this date — 60-year average.
0.17Northbrook, Sunday, 1 November
Climate normal for this date — 60-year average.
0.13Northbrook, Monday, 2 November
Climate normal for this date — 60-year average.
0.06Northbrook, Tuesday, 3 November
Climate normal for this date — 60-year average.
0.09Northbrook, Wednesday, 4 November
Climate normal for this date — 60-year average.
0.12Northbrook, Thursday, 5 November
Climate normal for this date — 60-year average.
0.09Northbrook, Friday, 6 November
Climate normal for this date — 60-year average.
0.05Northbrook, Saturday, 7 November
Climate normal for this date — 60-year average.
0.06Northbrook, Sunday, 8 November
Climate normal for this date — 60-year average.
0.12Northbrook, 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 Northbrook, 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 Northbrook, 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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