Weather in Lake Forest, IL
Lake Forest, Saturday, 8 August, 16:32
Clear. Feels like 84°. High 83°, low 68°.
Monthly outlook for Lake Forest, IL: average high 77°, average low 65.6°. That is 0.5° below the climate normal for August. Precipitation is expected on 6 days (about 2.6 inches), against a normal of 6 days and 1.8 inches. The warmest day looks like 9 August (83.6°), the coolest 23 August (57.7°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 8 August – 17 August | 78.9° | 78.1° | +0.4° |
| 18 August – 27 August | 73.9° | 77.8° | -2.1° |
| 28 August – 6 September | at normal | 76.4° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Highwood (3 mi).
1.1
Lake Forest, Sunday, 9 August
Heavy rain. High 84°, low 66°.
0.3Lake Forest, Monday, 10 August
Heavy rain. High 80°, low 72°.
0.57Lake Forest, Tuesday, 11 August
Heavy rain. High 82°, low 69°.
0
Lake Forest, Wednesday, 12 August
Overcast. High 83°, low 68°.
0.08Lake Forest, Thursday, 13 August
Light rain. High 72°, low 64°.
0Lake Forest, Friday, 14 August
Clear. High 72°, low 62°.
0Lake Forest, Saturday, 15 August
Overcast. High 75°, low 60°.
0
Lake Forest, Sunday, 16 August
Partly cloudy. High 80°, low 63°.
0.04Lake Forest, Monday, 17 August
Light rain. High 79°, low 69°.
0Lake Forest, Tuesday, 18 August
Light rain. High 77°, low 70°.
0.37Lake Forest, Wednesday, 19 August
Rain. High 81°, low 69°.
0.02Lake Forest, Thursday, 20 August
Light rain. High 75°, low 68°.
0Lake Forest, Friday, 21 August
Overcast. High 74°, low 65°.
0.1Lake Forest, Saturday, 22 August
Light rain. High 72°, low 60°.
0Lake Forest, Sunday, 23 August
Clear. High 64°, low 58°.
0.11Lake Forest, Monday, 24 August
Climate normal for this date — 60-year average.
0.07Lake Forest, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.14
Lake Forest, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.1Lake Forest, Thursday, 27 August
Climate normal for this date — 60-year average.
0.12Lake Forest, Friday, 28 August
Climate normal for this date — 60-year average.
0.13Lake Forest, Saturday, 29 August
Climate normal for this date — 60-year average.
0.09Lake Forest, Sunday, 30 August
Climate normal for this date — 60-year average.
0.06Lake Forest, Monday, 31 August
Climate normal for this date — 60-year average.
0.1Lake Forest, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.04Lake Forest, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.09Lake Forest, Thursday, 3 September
Climate normal for this date — 60-year average.
0.08Lake Forest, Friday, 4 September
Climate normal for this date — 60-year average.
0.08Lake Forest, Saturday, 5 September
Climate normal for this date — 60-year average.
0.09Lake Forest, Sunday, 6 September
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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