Weather in Lake Forest, IL
Lake Forest, Saturday, 17 October, 23:20
Clear. Feels like 42°. High 57°, low 35°.
Monthly outlook for Lake Forest, IL: average high 62.6°, average low 49.1°. That is 4° above the climate normal for October. Precipitation is expected on 1 day (about 0.1 inches), against a normal of 5 days and 1.6 inches. The warmest day looks like 24 October (69.2°), the coolest 17 October (35.4°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 17 October – 26 October | 62.8° | 56.6° | +3.5° |
| 27 October – 5 November | 62.2° | 52.8° | +5.2° |
| 6 November – 15 November | at normal | 47.7° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Highwood (3 mi).
0
Lake Forest, Sunday, 18 October
Clear. High 62°, low 44°.
0Lake Forest, Monday, 19 October
Clear. High 63°, low 44°.
0
Lake Forest, Tuesday, 20 October
Partly cloudy. High 63°, low 44°.
0Lake Forest, Wednesday, 21 October
Clear. High 66°, low 45°.
0Lake Forest, Thursday, 22 October
Clear. High 66°, low 49°.
0.01
Lake Forest, Friday, 23 October
Light rain. High 64°, low 56°.
0
Lake Forest, Saturday, 24 October
Overcast. High 69°, low 59°.
0Lake Forest, Sunday, 25 October
Overcast. High 64°, low 46°.
0Lake Forest, Monday, 26 October
Clear. High 56°, low 40°.
0Lake Forest, Tuesday, 27 October
Overcast. High 58°, low 43°.
0Lake Forest, Wednesday, 28 October
Overcast. High 61°, low 53°.
0.02Lake Forest, Thursday, 29 October
Light rain. High 64°, low 61°.
0
Lake Forest, Friday, 30 October
Mostly clear. High 65°, low 55°.
0.06Lake Forest, Saturday, 31 October
Light rain. High 61°, low 54°.
0.03Lake Forest, Sunday, 1 November
Light rain. High 65°, low 54°.
0.13
Lake Forest, Monday, 2 November
Climate normal for this date — 60-year average.
0.06Lake Forest, Tuesday, 3 November
Climate normal for this date — 60-year average.
0.09Lake 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.
0.12Lake 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.
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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