Weather in Grayslake, IL
Grayslake, Friday, 16 October, 04:59
Partly cloudy. Feels like 51°. High 56°, low 45°.
Monthly outlook for Grayslake, IL: average high 61.9°, average low 47.4°. That is 3.1° above the climate normal for October. Precipitation is expected on 2 days (about 0.6 inches), against a normal of 5 days and 1.5 inches. The warmest day looks like 25 October (71.4°), the coolest 31 October (39.3°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 16 October – 25 October | 63.4° | 57.4° | +3.4° |
| 26 October – 4 November | 59.2° | 53.5° | +3.2° |
| 5 November – 14 November | at normal | 48.2° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Round Lake Beach (4 mi).
0
Grayslake, Saturday, 17 October
Clear. High 56°, low 40°.
0Grayslake, Sunday, 18 October
Clear. High 60°, low 44°.
0
Grayslake, Monday, 19 October
Mostly clear. High 62°, low 44°.
0
Grayslake, Tuesday, 20 October
Overcast. High 64°, low 46°.
0Grayslake, Wednesday, 21 October
Clear. High 65°, low 47°.
0.01
Grayslake, Thursday, 22 October
Light rain. High 59°, low 53°.
0Grayslake, Friday, 23 October
Clear. High 70°, low 51°.
0Grayslake, Saturday, 24 October
Clear. High 71°, low 54°.
0Grayslake, Sunday, 25 October
Overcast. High 71°, low 54°.
0Grayslake, Monday, 26 October
Overcast. High 64°, low 53°.
0.03Grayslake, Tuesday, 27 October
Light rain. High 59°, low 47°.
0Grayslake, Wednesday, 28 October
Mostly clear. High 63°, low 45°.
0Grayslake, Thursday, 29 October
Overcast. High 62°, low 50°.
0.42Grayslake, Friday, 30 October
Rain. High 63°, low 47°.
0.02Grayslake, Saturday, 31 October
Light rain. High 44°, low 39°.
0.16
Grayslake, Sunday, 1 November
Climate normal for this date — 60-year average.
0.14Grayslake, Monday, 2 November
Climate normal for this date — 60-year average.
0.06
Grayslake, Tuesday, 3 November
Climate normal for this date — 60-year average.
0.1Grayslake, Wednesday, 4 November
Climate normal for this date — 60-year average.
0.12Grayslake, Thursday, 5 November
Climate normal for this date — 60-year average.
0.09Grayslake, Friday, 6 November
Climate normal for this date — 60-year average.
0.05Grayslake, Saturday, 7 November
Climate normal for this date — 60-year average.
0.04Grayslake, Sunday, 8 November
Climate normal for this date — 60-year average.
0.11Grayslake, Monday, 9 November
Climate normal for this date — 60-year average.
0.11Grayslake, Tuesday, 10 November
Climate normal for this date — 60-year average.
0.08Grayslake, Wednesday, 11 November
Climate normal for this date — 60-year average.
0.06Grayslake, Thursday, 12 November
Climate normal for this date — 60-year average.
0.05Grayslake, Friday, 13 November
Climate normal for this date — 60-year average.
0.07Grayslake, Saturday, 14 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 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
54°Weather in Annapolis, MD62°Weather in Atlanta, GA
66°Weather in Augusta, ME41°Weather in Austin, TX67°Weather in Baton Rouge, LA67°Weather in Bismarck, ND38°Weather in Boise, ID50°Weather in Boston, MA53°Weather in Carson City, NV45°Weather in Charleston, WV71°Weather in Charlotte Amalie, VI81°Weather in Cheyenne, WY29°Weather in Columbia, SC65°Weather in Columbus, OH71°Weather in Concord, NH46°Weather in Denver, CO38°Weather in Des Moines, IA48°Weather in Dover, DE62°Weather in Frankfort, KY68°Weather in Harrisburg, PA60°Weather in Hartford, CT55°Weather in Helena, MT30°Weather in Honolulu, HI76°Weather in Indianapolis, IN57°Weather in Jackson, MS65°Weather in Jefferson City, MO50°Weather in Juneau, AK45°Weather in Lansing, MI57°Weather in Lincoln, NE48°Weather in Little Rock, AR66°Weather in Madison, WI49°Weather in Montgomery, AL61°Weather in Montpelier, VT45°Weather in Nashville, TN71°Weather in Oklahoma City, OK52°Weather in Olympia, WA44°Weather in Phoenix, AZ74°Weather in Pierre, SD43°Weather in Providence, RI55°Weather in Raleigh, NC67°Weather in Richmond, VA65°Weather in Sacramento, CA57°Weather in Salem, OR49°Weather in Salt Lake City, UT48°Weather in San Juan, PR77°Weather in Santa Fe, NM36°Weather in Springfield, IL52°Weather in St. Paul, MN47°Weather in Tallahassee, FL65°Weather in Topeka, KS45°Weather in Trenton, NJ59°Weather in Washington, DC62°59°Weather in Creal Springs, IL57°Weather in Carterville, IL56°Weather in Herrin, IL57°Weather in Hurst, IL56°Weather in Anna, IL60°Weather in Cairo, IL63°Weather in East Dubuque, IL46°Weather in Galena, IL46°Weather in Freeport, IL50°Weather in Marengo, IL50°Weather in McHenry, IL51°Weather in North Chicago, IL52°Weather in Lake Forest, IL52°Weather in Mount Carroll, IL48°Weather in Lanark, IL47°Weather in Evanston, IL54°Weather in Markham, IL53°Weather in Northlake, IL53°Weather in Oak Forest, IL53°