As of 23:33 CDT

Weather in Grayslake, IL

55°

Grayslake, Friday, 23 October, 23:33

Clear. Feels like 54°. High 71°, low 46°.

Pressure30.30 inHg

Wind3.4 mph SE

Humidity85%

Visibility6.2 mi

Dew point50°

See detailed hourly forecast

Monthly outlook for Grayslake, IL: average high 63.1°, average low 48.4°. That is 5.4° above the climate normal for October. Precipitation is expected on 2 days (about 0.2 inches), against a normal of 5 days and 1.6 inches. The warmest day looks like 25 October (71.4°), the coolest 4 November (39.9°).

63.1°/48.4°

Average high / low

+5.4°

Above normal

2 / 5

Wet days / normal

0.2 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
23 October – 1 November	66.7°	54.9°	+6.6°
2 November – 11 November	57.2°	50.1°	+3.9°
12 November – 21 November	at normal	45.2°	—

October records over 66 years

86.9°3 October 2025All-time high

26.1°30 October 1988All-time low

Climate normals and records are computed from the nearest reference point — Round Lake Beach (4 mi).

Sat, 2468° / 47°

68 °

Grayslake, Saturday, 24 October

Overcast. High 68°, low 47°.

Pressure30.39 inHg

Wind7 mph S

Humidity64%

Visibility6.2 mi

Dew point50°

Sun, 2571° / 48°

71 °

Grayslake, Sunday, 25 October

Partly cloudy. High 71°, low 48°.

Pressure30.39 inHg

Wind6.4 mph SW

Humidity61%

Visibility6.2 mi

Dew point52°

Mon, 2662° / 50°

62 °

Grayslake, Monday, 26 October

Overcast. High 62°, low 50°.

Pressure30.36 inHg

Wind8 mph NE

Humidity66%

Visibility6.2 mi

Dew point51°

Tue, 2761° / 51°

61 °

Grayslake, Tuesday, 27 October

Overcast. High 61°, low 51°.

Pressure30.30 inHg

Wind8.1 mph E

Humidity78%

Visibility6.2 mi

Dew point53°

Wed, 2868° / 55°

68 °

Grayslake, Wednesday, 28 October

Light rain. High 68°, low 55°.

Pressure30.15 inHg

Wind10.8 mph SW

Humidity60%

Visibility—

Dew point51°

Thu, 2971° / 55°

0.03

71 °

Grayslake, Thursday, 29 October

Light rain. High 71°, low 55°.

Pressure30.18 inHg

Wind9.3 mph SW

Humidity60%

Visibility—

Dew point53°

Fri, 3065° / 58°

0.04

65 °

Grayslake, Friday, 30 October

Light rain. High 65°, low 58°.

Pressure30.15 inHg

Wind5.7 mph SW

Humidity68%

Visibility—

Dew point53°

Sat, 3169° / 58°

0.14

69 °

Grayslake, Saturday, 31 October

Light rain. High 69°, low 58°.

Pressure30.09 inHg

Wind14.7 mph S

Humidity48%

Visibility—

Dew point47°

Sun, 0160° / 48°

0.02

60 °

Grayslake, Sunday, 1 November

Light rain. High 60°, low 48°.

Pressure29.88 inHg

Wind17.4 mph S

Humidity72%

Visibility—

Dew point50°

Mon, 0254° / 40°

54 °

Grayslake, Monday, 2 November

Clear. High 54°, low 40°.

Pressure30.06 inHg

Wind13.3 mph W

Humidity41%

Visibility—

Dew point28°

Tue, 0347° / 41°

47 °

Grayslake, Tuesday, 3 November

Mostly clear. High 47°, low 41°.

Pressure30.06 inHg

Wind15.2 mph NW

Humidity40%

Visibility—

Dew point24°

Wed, 0451° / 40°

51 °

Grayslake, Wednesday, 4 November

Overcast. High 51°, low 40°.

Pressure30.06 inHg

Wind9.6 mph SW

Humidity36%

Visibility—

Dew point23°

Thu, 0562° / 41°

62 °

Grayslake, Thursday, 5 November

Overcast. High 62°, low 41°.

Pressure30.00 inHg

Wind9.3 mph W

Humidity39%

Visibility—

Dew point33°

Fri, 0669° / 48°

69 °

Grayslake, Friday, 6 November

Mostly clear. High 69°, low 48°.

Pressure29.97 inHg

Wind14.8 mph SW

Humidity58%

Visibility—

Dew point49°

Sat, 0760° / 48°

60 °

Grayslake, Saturday, 7 November

Overcast. High 60°, low 48°.

Pressure30.06 inHg

Wind14.3 mph NW

Humidity44%

Visibility—

Dew point37°

From day 17 onward the outlook is built from 60-year climate statistics

Sun, 0850° / 38°

0.04

50 °

Grayslake, Sunday, 8 November

Climate normal for this date — 60-year average.

Average high50°

Average low38°

Average precipitation0.04 in

Chance of precipitation18%

Record high73° (2020)

Record low15° (1991)

Mon, 0950° / 38°

0.11

50 °

Grayslake, Monday, 9 November

Climate normal for this date — 60-year average.

Average high50°

Average low38°

Average precipitation0.11 in

Chance of precipitation33%

Record high73° (2020)

Record low20° (1991)

Tue, 1049° / 37°

0.11

49 °

Grayslake, Tuesday, 10 November

Climate normal for this date — 60-year average.

Average high49°

Average low37°

Average precipitation0.11 in

Chance of precipitation38%

Record high72° (2022)

Record low16° (2017)

Wed, 1146° / 35°

0.08

46 °

Grayslake, Wednesday, 11 November

Climate normal for this date — 60-year average.

Average high46°

Average low35°

Average precipitation0.08 in

Chance of precipitation35%

Record high67° (1964)

Record low15° (2019)

Thu, 1245° / 34°

0.06

45 °

Grayslake, Thursday, 12 November

Climate normal for this date — 60-year average.

Average high45°

Average low34°

Average precipitation0.06 in

Chance of precipitation22%

Record high64° (1964)

Record low3° (2019)

Fri, 1345° / 33°

0.05

45 °

Grayslake, Friday, 13 November

Climate normal for this date — 60-year average.

Average high45°

Average low33°

Average precipitation0.05 in

Chance of precipitation25%

Record high67° (1999)

Record low2° (2019)

Sat, 1446° / 34°

0.07

46 °

Grayslake, Saturday, 14 November

Climate normal for this date — 60-year average.

Average high46°

Average low34°

Average precipitation0.07 in

Chance of precipitation28%

Record high66° (1971)

Record low15° (1986)

Sun, 1546° / 35°

0.08

46 °

Grayslake, Sunday, 15 November

Climate normal for this date — 60-year average.

Average high46°

Average low35°

Average precipitation0.08 in

Chance of precipitation28%

Record high68° (2025)

Record low17° (2019)

Mon, 1646° / 34°

0.05

46 °

Grayslake, Monday, 16 November

Climate normal for this date — 60-year average.

Average high46°

Average low34°

Average precipitation0.05 in

Chance of precipitation17%

Record high62° (1988)

Record low21° (1997)

Tue, 1746° / 35°

0.1

46 °

Grayslake, Tuesday, 17 November

Climate normal for this date — 60-year average.

Average high46°

Average low35°

Average precipitation0.1 in

Chance of precipitation28%

Record high68° (2016)

Record low15° (2014)

Wed, 1846° / 35°

0.1

46 °

Grayslake, Wednesday, 18 November

Climate normal for this date — 60-year average.

Average high46°

Average low35°

Average precipitation0.1 in

Chance of precipitation28%

Record high64° (1975)

Record low12° (2014)

Thu, 1946° / 35°

0.07

46 °

Grayslake, Thursday, 19 November

Climate normal for this date — 60-year average.

Average high46°

Average low35°

Average precipitation0.07 in

Chance of precipitation32%

Record high63° (1983)

Record low15° (2018)

Fri, 2044° / 33°

0.07

44 °

Grayslake, Friday, 20 November

Climate normal for this date — 60-year average.

Average high44°

Average low33°

Average precipitation0.07 in

Chance of precipitation35%

Record high61° (2003)

Record low13° (2022)

Sat, 2143° / 32°

0.1

43 °

Grayslake, Saturday, 21 November

Climate normal for this date — 60-year average.

Average high43°

Average low32°

Average precipitation0.1 in

Chance of precipitation25%

Record high64° (1990)

Record low11° (1964)

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.