Monthly outlook for Lake Catherine, IL: average high 55.1°, average low 45.1°. That is 2.3° above the climate normal for October. Precipitation is expected on 7 days (about 3.4 inches), against a normal of 5 days and 1.4 inches. The warmest day looks like 28 October (71.4°), the coolest 8 November (32.3°).
55.1°/45.1°
Average high / low
+2.3°
Above normal
7 / 5
Wet days / normal
3.4 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
28 October – 6 November
60.1°
52.7°
+4.1°
7 November – 16 November
46.9°
47.2°
-0.2°
17 November – 26 November
at normal
43.7°
—
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 (8 mi).
Thu, 2967° / 53°0.06
67 °
Lake Catherine, Thursday, 29 October
Light rain. High 67°, low 53°.
Pressure30.09 inHg
Wind8.1 mph NW
Humidity80%
Visibility6.2 mi
Dew point57°
Fri, 3060° / 43°0.05
60 °
Lake Catherine, Friday, 30 October
Light rain. High 60°, low 43°.
Pressure30.33 inHg
Wind5.1 mph E
Humidity65%
Visibility6.2 mi
Dew point47°
Sat, 3157° / 50°0.31
57 °
Lake Catherine, Saturday, 31 October
Rain. High 57°, low 50°.
Pressure30.30 inHg
Wind6.6 mph SE
Humidity80%
Visibility6.2 mi
Dew point51°
Sun, 0162° / 47°0
62 °
Lake Catherine, Sunday, 1 November
Overcast. High 62°, low 47°.
Pressure30.33 inHg
Wind3.8 mph E
Humidity78%
Visibility6.2 mi
Dew point53°
Mon, 0264° / 51°0
64 °
Lake Catherine, Monday, 2 November
Light rain. High 64°, low 51°.
Pressure30.15 inHg
Wind11.3 mph S
Humidity71%
Visibility—
Dew point53°
Tue, 0358° / 54°1.59
58 °
Lake Catherine, Tuesday, 3 November
Rain. High 58°, low 54°.
Pressure29.97 inHg
Wind17.3 mph E
Humidity97%
Visibility—
Dew point54°
Wed, 0455° / 54°0.52
55 °
Lake Catherine, Wednesday, 4 November
Rain. High 55°, low 54°.
Pressure29.83 inHg
Wind13.6 mph E
Humidity97%
Visibility—
Dew point53°
Thu, 0556° / 52°0.3
56 °
Lake Catherine, Thursday, 5 November
Light rain. High 56°, low 52°.
Pressure29.68 inHg
Wind13.1 mph N
Humidity94%
Visibility—
Dew point53°
Fri, 0650° / 38°0
50 °
Lake Catherine, Friday, 6 November
Mostly clear. High 50°, low 38°.
Pressure30.00 inHg
Wind12.7 mph N
Humidity54%
Visibility—
Dew point31°
Sat, 0745° / 35°0
45 °
Lake Catherine, Saturday, 7 November
Overcast. High 45°, low 35°.
Pressure30.30 inHg
Wind7.7 mph N
Humidity52%
Visibility—
Dew point27°
Sun, 0849° / 32°0
49 °
Lake Catherine, Sunday, 8 November
Clear. High 49°, low 32°.
Pressure30.39 inHg
Wind5.9 mph S
Humidity52%
Visibility—
Dew point29°
Mon, 0952° / 36°0
52 °
Lake Catherine, Monday, 9 November
Overcast. High 52°, low 36°.
Pressure30.18 inHg
Wind10.5 mph SE
Humidity41%
Visibility—
Dew point27°
Tue, 1050° / 45°0.57
50 °
Lake Catherine, Tuesday, 10 November
Rain. High 50°, low 45°.
Pressure29.91 inHg
Wind21.3 mph NE
Humidity98%
Visibility—
Dew point49°
Wed, 1143° / 40°0.02
43 °
Lake Catherine, Wednesday, 11 November
Light rain. High 43°, low 40°.
Pressure30.15 inHg
Wind22.7 mph NE
Humidity78%
Visibility—
Dew point35°
Thu, 1242° / 39°0
42 °
Lake Catherine, Thursday, 12 November
Overcast. High 42°, low 39°.
Pressure30.09 inHg
Wind13 mph NE
Humidity81%
Visibility—
Dew point36°
From day 17 onward the outlook is built from 60-year climate statistics
Fri, 1345° / 33°0.05
45 °
Lake Catherine, 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 °
Lake Catherine, 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 °
Lake Catherine, 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 °
Lake Catherine, 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 °
Lake Catherine, 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 °
Lake Catherine, 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 °
Lake Catherine, 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 °
Lake Catherine, 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 °
Lake Catherine, 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 °
Lake Catherine, 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 °
Lake Catherine, 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 °
Lake Catherine, 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 °
Lake Catherine, 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 °
Lake Catherine, 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)
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 Lake Catherine, 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 Lake Catherine, 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.