Weather in Lake Forest, IL
Lake Forest, Wednesday, 21 October, 01:15
Clear. Feels like 50°. High 71°, low 42°.
Monthly outlook for Lake Forest, IL: average high 58.4°, average low 45.6°. That is 2.4° above the climate normal for October. Precipitation is expected on 3 days (about 0.3 inches), against a normal of 5 days and 1.6 inches. The warmest day looks like 22 October (73.6°), the coolest 30 October (39.1°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 21 October – 30 October | 61.2° | 55.2° | +3.3° |
| 31 October – 9 November | 53.6° | 51.2° | +1.4° |
| 10 November – 19 November | at normal | 46° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Highwood (3 mi).
0
Lake Forest, Thursday, 22 October
Clear. High 74°, low 45°.
0
Lake Forest, Friday, 23 October
Partly cloudy. High 66°, low 51°.
0
Lake Forest, Saturday, 24 October
Overcast. High 66°, low 50°.
0Lake Forest, Sunday, 25 October
Overcast. High 69°, low 53°.
0.08
Lake Forest, Monday, 26 October
Light rain. High 67°, low 48°.
0.16Lake Forest, Tuesday, 27 October
Light rain. High 48°, low 43°.
0Lake Forest, Wednesday, 28 October
Overcast. High 48°, low 43°.
0
Lake Forest, Thursday, 29 October
Mostly clear. High 52°, low 40°.
0Lake Forest, Friday, 30 October
Clear. High 51°, low 39°.
0Lake Forest, Saturday, 31 October
Clear. High 60°, low 46°.
0.09Lake Forest, Sunday, 1 November
Light rain. High 55°, low 52°.
0Lake Forest, Monday, 2 November
Clear. High 57°, low 47°.
0Lake Forest, Tuesday, 3 November
Overcast. High 48°, low 39°.
0.01Lake Forest, Wednesday, 4 November
Light rain. High 51°, low 45°.
0Lake Forest, Thursday, 5 November
Mostly clear. High 51°, low 46°.
0.09Lake Forest, Friday, 6 November
Climate normal for this date — 60-year average.
0.05Lake Forest, Saturday, 7 November
Climate normal for this date — 60-year average.
0.06Lake Forest, Sunday, 8 November
Climate normal for this date — 60-year average.
0.12
Lake Forest, Monday, 9 November
Climate normal for this date — 60-year average.
0.11Lake Forest, Tuesday, 10 November
Climate normal for this date — 60-year average.
0.08Lake Forest, Wednesday, 11 November
Climate normal for this date — 60-year average.
0.06Lake Forest, Thursday, 12 November
Climate normal for this date — 60-year average.
0.05Lake Forest, Friday, 13 November
Climate normal for this date — 60-year average.
0.07Lake Forest, Saturday, 14 November
Climate normal for this date — 60-year average.
0.09Lake Forest, Sunday, 15 November
Climate normal for this date — 60-year average.
0.05Lake Forest, Monday, 16 November
Climate normal for this date — 60-year average.
0.09Lake Forest, Tuesday, 17 November
Climate normal for this date — 60-year average.
0.11Lake Forest, Wednesday, 18 November
Climate normal for this date — 60-year average.
0.07Lake Forest, Thursday, 19 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 Lake Forest, 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 Lake Forest, 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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