Weather in Vernon Hills, IL
Vernon Hills, Sunday, 9 August, 13:10
Heavy rain. Feels like 90°. High 83°, low 62°.
Monthly outlook for Vernon Hills, IL: average high 78.9°, average low 63.9°. That is 0.6° above the climate normal for August. Precipitation is expected on 7 days (about 3.4 inches), against a normal of 6 days and 1.8 inches. The warmest day looks like 10 August (89.5°), the coolest 23 August (57.2°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 August – 18 August | 79.5° | 77.9° | +0.9° |
| 19 August – 28 August | 77.9° | 77.8° | +0° |
| 29 August – 7 September | at normal | 76.1° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Highwood (8 mi).
0.56Vernon Hills, Monday, 10 August
Heavy rain. High 89°, low 72°.
1.52Vernon Hills, Tuesday, 11 August
Heavy rain. High 84°, low 66°.
0
Vernon Hills, Wednesday, 12 August
Clear. High 85°, low 64°.
0.04Vernon Hills, Thursday, 13 August
Light rain. High 74°, low 64°.
0
Vernon Hills, Friday, 14 August
Overcast. High 73°, low 63°.
0.06Vernon Hills, Saturday, 15 August
Light rain. High 75°, low 65°.
0.16Vernon Hills, Sunday, 16 August
Light rain. High 76°, low 65°.
0Vernon Hills, Monday, 17 August
Overcast. High 77°, low 64°.
0Vernon Hills, Tuesday, 18 August
Overcast. High 79°, low 62°.
0.01Vernon Hills, Wednesday, 19 August
Light rain. High 75°, low 65°.
0.04Vernon Hills, Thursday, 20 August
Light rain. High 74°, low 62°.
0.09Vernon Hills, Friday, 21 August
Light rain. High 79°, low 63°.
0.02Vernon Hills, Saturday, 22 August
Light rain. High 81°, low 65°.
0Vernon Hills, Sunday, 23 August
Clear. High 77°, low 57°.
0Vernon Hills, Monday, 24 August
Clear. High 80°, low 63°.
0.07
Vernon Hills, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.14
Vernon Hills, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.1Vernon Hills, Thursday, 27 August
Climate normal for this date — 60-year average.
0.12Vernon Hills, Friday, 28 August
Climate normal for this date — 60-year average.
0.13Vernon Hills, Saturday, 29 August
Climate normal for this date — 60-year average.
0.09Vernon Hills, Sunday, 30 August
Climate normal for this date — 60-year average.
0.06Vernon Hills, Monday, 31 August
Climate normal for this date — 60-year average.
0.1Vernon Hills, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.04Vernon Hills, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.09Vernon Hills, Thursday, 3 September
Climate normal for this date — 60-year average.
0.08Vernon Hills, Friday, 4 September
Climate normal for this date — 60-year average.
0.08Vernon Hills, Saturday, 5 September
Climate normal for this date — 60-year average.
0.09Vernon Hills, Sunday, 6 September
Climate normal for this date — 60-year average.
0.07Vernon Hills, Monday, 7 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 Vernon Hills, 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 Vernon Hills, 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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