Weather in Grayslake, IL
Grayslake, Wednesday, 4 November, 10:07
Overcast. Feels like 62°. High 65°, low 55°.
Monthly outlook for Grayslake, IL: average high 55.8°, average low 42.5°. That is 4.6° above the climate normal for November. Precipitation is expected on 2 days (about 0.5 inches), against a normal of 4 days and 1.3 inches. The warmest day looks like 4 November (64.7°), the coolest 7 November (35.2°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 4 November – 13 November | 53.7° | 48.7° | +2.8° |
| 14 November – 23 November | 59.4° | 44.8° | +8.1° |
| 24 November – 3 December | at normal | 39.9° | — |
November records over 66 years
Climate normals and records are computed from the nearest reference point — Round Lake Beach (4 mi).
0.03
Grayslake, Thursday, 5 November
Light rain. High 55°, low 46°.
0Grayslake, Friday, 6 November
Overcast. High 48°, low 40°.
0Grayslake, Saturday, 7 November
Overcast. High 48°, low 35°.
0Grayslake, Sunday, 8 November
Overcast. High 58°, low 40°.
0Grayslake, Monday, 9 November
Overcast. High 57°, low 39°.
0
Grayslake, Tuesday, 10 November
Clear. High 57°, low 43°.
0Grayslake, Wednesday, 11 November
Overcast. High 50°, low 38°.
0Grayslake, Thursday, 12 November
Overcast. High 47°, low 39°.
0
Grayslake, Friday, 13 November
Partly cloudy. High 53°, low 36°.
0Grayslake, Saturday, 14 November
Clear. High 59°, low 40°.
0Grayslake, Sunday, 15 November
Overcast. High 62°, low 46°.
0Grayslake, Monday, 16 November
Clear. High 59°, low 44°.
0Grayslake, Tuesday, 17 November
Clear. High 61°, low 48°.
0.01Grayslake, Wednesday, 18 November
Light rain. High 60°, low 49°.
0.21Grayslake, Thursday, 19 November
Light rain. High 56°, low 41°.
0.07
Grayslake, Friday, 20 November
Climate normal for this date — 60-year average.
0.1Grayslake, Saturday, 21 November
Climate normal for this date — 60-year average.
0.04
Grayslake, Sunday, 22 November
Climate normal for this date — 60-year average.
0.07Grayslake, Monday, 23 November
Climate normal for this date — 60-year average.
0.08Grayslake, Tuesday, 24 November
Climate normal for this date — 60-year average.
0.09Grayslake, Wednesday, 25 November
Climate normal for this date — 60-year average.
0.12Grayslake, Thursday, 26 November
Climate normal for this date — 60-year average.
0.21Grayslake, Friday, 27 November
Climate normal for this date — 60-year average.
0.12Grayslake, Saturday, 28 November
Climate normal for this date — 60-year average.
0.08Grayslake, Sunday, 29 November
Climate normal for this date — 60-year average.
0.07Grayslake, Monday, 30 November
Climate normal for this date — 60-year average.
0.14Grayslake, Tuesday, 1 December
Climate normal for this date — 60-year average.
0.07Grayslake, Wednesday, 2 December
Climate normal for this date — 60-year average.
0.09Grayslake, Thursday, 3 December
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 Grayslake, 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 Grayslake, 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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