Weather in Lake Forest, IL
Lake Forest, Wednesday, 21 October, 13:54
Mostly clear. Feels like 70°. High 71°, low 42°.
Monthly outlook for Lake Forest, IL: average high 62.6°, average low 50.8°. That is 4.8° above the climate normal for October. Precipitation is expected on 8 days (about 3.9 inches), against a normal of 5 days and 1.6 inches. The warmest day looks like 21 October (71.1°), the coolest 21 October (41.5°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 21 October – 30 October | 64.8° | 55.2° | +5.3° |
| 31 October – 9 November | 58.9° | 51.2° | +4.3° |
| 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 71°, low 44°.
0Lake Forest, Friday, 23 October
Clear. High 66°, low 46°.
0
Lake Forest, Saturday, 24 October
Overcast. High 66°, low 49°.
0Lake Forest, Sunday, 25 October
Overcast. High 68°, low 52°.
0Lake Forest, Monday, 26 October
Overcast. High 69°, low 52°.
0Lake Forest, Tuesday, 27 October
Overcast. High 56°, low 53°.
0.07
Lake Forest, Wednesday, 28 October
Light rain. High 66°, low 55°.
0.07Lake Forest, Thursday, 29 October
Light rain. High 62°, low 48°.
0Lake Forest, Friday, 30 October
Overcast. High 54°, low 46°.
0.16Lake Forest, Saturday, 31 October
Light rain. High 61°, low 51°.
0.89Lake Forest, Sunday, 1 November
Rain. High 60°, low 58°.
0.88Lake Forest, Monday, 2 November
Rain. High 59°, low 57°.
1.15Lake Forest, Tuesday, 3 November
Rain. High 59°, low 57°.
0.45Lake Forest, Wednesday, 4 November
Rain. High 61°, low 54°.
0.24Lake Forest, Thursday, 5 November
Light rain. High 53°, low 50°.
0.09
Lake 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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