Weather in Lake Forest, IL
Lake Forest, Monday, 19 October, 16:56
Overcast. Feels like 61°. High 66°, low 40°.
Monthly outlook for Lake Forest, IL: average high 57.6°, average low 43.9°. That is 1.6° above the climate normal for October. Precipitation is expected on 2 days (about 0.5 inches), against a normal of 5 days and 1.6 inches. The warmest day looks like 20 October (67.4°), the coolest 29 October (32°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 19 October – 28 October | 59.8° | 55.8° | +2.2° |
| 29 October – 7 November | 53.9° | 52.1° | +1° |
| 8 November – 17 November | at normal | 46.8° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Highwood (3 mi).
0
Lake Forest, Tuesday, 20 October
Clear. High 67°, low 44°.
0Lake Forest, Wednesday, 21 October
Clear. High 67°, low 44°.
0.02
Lake Forest, Thursday, 22 October
Light rain. High 64°, low 49°.
0
Lake Forest, Friday, 23 October
Mostly clear. High 58°, low 49°.
0Lake Forest, Saturday, 24 October
Overcast. High 58°, low 45°.
0Lake Forest, Sunday, 25 October
Overcast. High 64°, low 48°.
0Lake Forest, Monday, 26 October
Overcast. High 59°, low 51°.
0.02Lake Forest, Tuesday, 27 October
Light rain. High 52°, low 41°.
0Lake Forest, Wednesday, 28 October
Clear. High 43°, low 32°.
0Lake Forest, Thursday, 29 October
Clear. High 49°, low 32°.
0Lake Forest, Friday, 30 October
Overcast. High 53°, low 38°.
0Lake Forest, Saturday, 31 October
Overcast. High 59°, low 47°.
0Lake Forest, Sunday, 1 November
Overcast. High 60°, low 51°.
0.41Lake Forest, Monday, 2 November
Light rain. High 51°, low 46°.
0.06Lake Forest, Tuesday, 3 November
Light rain. High 50°, low 46°.
0.09
Lake Forest, Wednesday, 4 November
Climate normal for this date — 60-year average.
0.12Lake Forest, Thursday, 5 November
Climate normal for this date — 60-year average.
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.
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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