Weather in Lake Forest, IL
Lake Forest, Tuesday, 13 October, 10:09
Clear. Feels like 71°. High 79°, low 69°.
Monthly outlook for Lake Forest, IL: average high 62.1°, average low 52.3°. That is 2.9° above the climate normal for October. Precipitation is expected on 7 days (about 2.5 inches), against a normal of 5 days and 1.7 inches. The warmest day looks like 13 October (79.4°), the coolest 17 October (39.1°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 13 October – 22 October | 64° | 58.1° | +3.3° |
| 23 October – 1 November | 58.9° | 54.4° | +2.5° |
| 2 November – 11 November | at normal | 50° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Highwood (3 mi).
0.1
Lake Forest, Wednesday, 14 October
Rain. High 74°, low 61°.
1.35Lake Forest, Thursday, 15 October
Heavy rain. High 64°, low 57°.
0.07Lake Forest, Friday, 16 October
Light rain. High 57°, low 46°.
0Lake Forest, Saturday, 17 October
Clear. High 55°, low 39°.
0Lake Forest, Sunday, 18 October
Clear. High 62°, low 45°.
0.1Lake Forest, Monday, 19 October
Light rain. High 60°, low 50°.
0.02Lake Forest, Tuesday, 20 October
Light rain. High 58°, low 55°.
0.04Lake Forest, Wednesday, 21 October
Light rain. High 65°, low 57°.
0.78Lake Forest, Thursday, 22 October
Rain. High 67°, low 63°.
0Lake Forest, Friday, 23 October
Light rain. High 74°, low 60°.
0
Lake Forest, Saturday, 24 October
Overcast. High 60°, low 49°.
0Lake Forest, Sunday, 25 October
Clear. High 58°, low 48°.
0
Lake Forest, Monday, 26 October
Partly cloudy. High 52°, low 44°.
0.01Lake Forest, Tuesday, 27 October
Light rain. High 52°, low 45°.
0.05Lake Forest, Wednesday, 28 October
Light rain. High 57°, low 50°.
0.06Lake Forest, Thursday, 29 October
Climate normal for this date — 60-year average.
0.1Lake Forest, Friday, 30 October
Climate normal for this date — 60-year average.
0.13
Lake Forest, Saturday, 31 October
Climate normal for this date — 60-year average.
0.17Lake Forest, Sunday, 1 November
Climate normal for this date — 60-year average.
0.13Lake 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.
0.05
Lake 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.
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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