As of 18:00 CST

Weather in Grayslake, IL

59°

Grayslake, Monday, 2 November, 18:00

Overcast. Feels like 59°. High 61°, low 55°.

Pressure29.97 inHg

Wind10 mph N

Humidity91%

Visibility6.2 mi

Dew point56°

See detailed hourly forecast

Monthly outlook for Grayslake, IL: average high 52.5°, average low 42.3°. That is 2.3° above the climate normal for November. Precipitation is expected on 5 days (about 0.9 inches), against a normal of 4 days and 1.3 inches. The warmest day looks like 3 November (68.3°), the coolest 9 November (31.4°).

52.5°/42.3°

Average high / low

+2.3°

Above normal

5 / 4

Wet days / normal

0.9 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
2 November – 11 November	55.3°	50.1°	+2.9°
12 November – 21 November	48°	45.2°	+1.5°
22 November – 1 December	at normal	40.9°	—

November records over 66 years

73°8 November 2020All-time high

1.6°13 November 2019All-time low

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

Tue, 0368° / 61°

0.13

68 °

Grayslake, Tuesday, 3 November

Rain. High 68°, low 61°.

Pressure29.83 inHg

Wind15.1 mph S

Humidity84%

Visibility3.1 mi

Dew point62°

Wed, 0463° / 55°

0.37

63 °

Grayslake, Wednesday, 4 November

Rain. High 63°, low 55°.

Pressure29.65 inHg

Wind14.5 mph SW

Humidity73%

Visibility6.2 mi

Dew point50°

Thu, 0555° / 52°

0.02

55 °

Grayslake, Thursday, 5 November

Light rain. High 55°, low 52°.

Pressure29.71 inHg

Wind12.5 mph SW

Humidity68%

Visibility6.2 mi

Dew point43°

Fri, 0655° / 49°

0.13

55 °

Grayslake, Friday, 6 November

Light rain. High 55°, low 49°.

Pressure29.88 inHg

Wind8.2 mph N

Humidity72%

Visibility6.2 mi

Dew point46°

Sat, 0753° / 47°

53 °

Grayslake, Saturday, 7 November

Overcast. High 53°, low 47°.

Pressure30.03 inHg

Wind9.7 mph N

Humidity68%

Visibility—

Dew point42°

Sun, 0848° / 41°

0.24

48 °

Grayslake, Sunday, 8 November

Light rain. High 48°, low 41°.

Pressure29.71 inHg

Wind14.9 mph N

Humidity90%

Visibility—

Dew point43°

Mon, 0945° / 31°

45 °

Grayslake, Monday, 9 November

Partly cloudy. High 45°, low 31°.

Pressure30.00 inHg

Wind8.9 mph NW

Humidity69%

Visibility—

Dew point32°

Tue, 1052° / 35°

52 °

Grayslake, Tuesday, 10 November

Clear. High 52°, low 35°.

Pressure30.00 inHg

Wind8.2 mph W

Humidity55%

Visibility—

Dew point33°

Wed, 1152° / 34°

52 °

Grayslake, Wednesday, 11 November

Clear. High 52°, low 34°.

Pressure30.03 inHg

Wind9.7 mph SW

Humidity41%

Visibility—

Dew point26°

Thu, 1247° / 34°

47 °

Grayslake, Thursday, 12 November

Clear. High 47°, low 34°.

Pressure30.09 inHg

Wind9.8 mph N

Humidity51%

Visibility—

Dew point27°

Fri, 1349° / 33°

49 °

Grayslake, Friday, 13 November

Partly cloudy. High 49°, low 33°.

Pressure30.03 inHg

Wind12.9 mph SW

Humidity42%

Visibility—

Dew point24°

Sat, 1448° / 37°

48 °

Grayslake, Saturday, 14 November

Clear. High 48°, low 37°.

Pressure30.12 inHg

Wind13.8 mph W

Humidity42%

Visibility—

Dew point24°

Sun, 1547° / 37°

47 °

Grayslake, Sunday, 15 November

Overcast. High 47°, low 37°.

Pressure30.15 inHg

Wind7.9 mph E

Humidity60%

Visibility—

Dew point33°

Mon, 1648° / 39°

48 °

Grayslake, Monday, 16 November

Clear. High 48°, low 39°.

Pressure30.24 inHg

Wind11.5 mph E

Humidity59%

Visibility—

Dew point33°

Tue, 1749° / 38°

49 °

Grayslake, Tuesday, 17 November

Clear. High 49°, low 38°.

Pressure30.27 inHg

Wind8.9 mph E

Humidity38%

Visibility—

Dew point23°

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

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)

Sun, 2243° / 31°

0.04

43 °

Grayslake, Sunday, 22 November

Climate normal for this date — 60-year average.

Average high43°

Average low31°

Average precipitation0.04 in

Chance of precipitation18%

Record high62° (2010)

Record low14° (2015)

Mon, 2343° / 32°

0.07

43 °

Grayslake, Monday, 23 November

Climate normal for this date — 60-year average.

Average high43°

Average low32°

Average precipitation0.07 in

Chance of precipitation30%

Record high63° (2003)

Record low12° (1970)

Tue, 2442° / 30°

0.08

42 °

Grayslake, Tuesday, 24 November

Climate normal for this date — 60-year average.

Average high42°

Average low30°

Average precipitation0.08 in

Chance of precipitation28%

Record high60° (1966)

Record low14° (2013)

Wed, 2542° / 32°

0.09

42 °

Grayslake, Wednesday, 25 November

Climate normal for this date — 60-year average.

Average high42°

Average low32°

Average precipitation0.09 in

Chance of precipitation33%

Record high59° (1966)

Record low16° (2005)

Thu, 2642° / 31°

0.12

42 °

Grayslake, Thursday, 26 November

Climate normal for this date — 60-year average.

Average high42°

Average low31°

Average precipitation0.12 in

Chance of precipitation45%

Record high61° (1990)

Record low6° (1977)

Fri, 2741° / 31°

0.21

41 °

Grayslake, Friday, 27 November

Climate normal for this date — 60-year average.

Average high41°

Average low31°

Average precipitation0.21 in

Chance of precipitation50%

Record high63° (1990)

Record low15° (1977)

Sat, 2839° / 28°

0.12

39 °

Grayslake, Saturday, 28 November

Climate normal for this date — 60-year average.

Average high39°

Average low28°

Average precipitation0.12 in

Chance of precipitation35%

Record high62° (1990)

Record low4° (2018)

Sun, 2940° / 28°

0.08

40 °

Grayslake, Sunday, 29 November

Climate normal for this date — 60-year average.

Average high40°

Average low28°

Average precipitation0.08 in

Chance of precipitation37%

Record high63° (1998)

Record low7° (1976)

Mon, 3040° / 29°

0.07

40 °

Grayslake, Monday, 30 November

Climate normal for this date — 60-year average.

Average high40°

Average low29°

Average precipitation0.07 in

Chance of precipitation32%

Record high64° (1998)

Record low10° (1964)

Tue, 0138° / 27°

0.14

38 °

Grayslake, Tuesday, 1 December

Climate normal for this date — 60-year average.

Average high38°

Average low27°

Average precipitation0.14 in

Chance of precipitation43%

Record high61° (1970)

Record low11° (2025)

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.