Monthly outlook for Long Lake, IL: average high 62°, average low 47.4°. That is 3° above the climate normal for October. Precipitation is expected on 4 days (about 1.3 inches), against a normal of 5 days and 1.5 inches. The warmest day looks like 23 October (73.5°), the coolest 30 October (37.4°).
62°/47.4°
Average high / low
+3°
Above normal
4 / 5
Wet days / normal
1.3 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
15 October – 24 October
64.6°
57.8°
+3.8°
25 October – 3 November
57.6°
53.9°
+2.1°
4 November – 13 November
at normal
48.7°
—
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 (2 mi).
Fri, 1656° / 43°0.04
56 °
Long Lake, Friday, 16 October
Light rain. High 56°, low 43°.
Pressure30.00 inHg
Wind17.1 mph NW
Humidity66%
Visibility6.2 mi
Dew point43°
Sat, 1754° / 38°0
54 °
Long Lake, Saturday, 17 October
Clear. High 54°, low 38°.
Pressure30.53 inHg
Wind4.6 mph W
Humidity50%
Visibility6.2 mi
Dew point33°
Sun, 1860° / 44°0
60 °
Long Lake, Sunday, 18 October
Clear. High 60°, low 44°.
Pressure30.42 inHg
Wind13.7 mph SW
Humidity49%
Visibility6.2 mi
Dew point37°
Mon, 1962° / 42°0
62 °
Long Lake, Monday, 19 October
Overcast. High 62°, low 42°.
Pressure30.36 inHg
Wind7.9 mph SW
Humidity53%
Visibility—
Dew point41°
Tue, 2066° / 44°0
66 °
Long Lake, Tuesday, 20 October
Clear. High 66°, low 44°.
Pressure30.36 inHg
Wind6.6 mph E
Humidity48%
Visibility—
Dew point42°
Wed, 2170° / 52°0
70 °
Long Lake, Wednesday, 21 October
Overcast. High 70°, low 52°.
Pressure30.30 inHg
Wind9.6 mph S
Humidity49%
Visibility—
Dew point47°
Thu, 2271° / 57°0
71 °
Long Lake, Thursday, 22 October
Partly cloudy. High 71°, low 57°.
Pressure30.21 inHg
Wind12.1 mph S
Humidity47%
Visibility—
Dew point48°
Fri, 2374° / 60°0.01
74 °
Long Lake, Friday, 23 October
Light rain. High 74°, low 60°.
Pressure29.97 inHg
Wind19.6 mph S
Humidity58%
Visibility—
Dew point56°
Sat, 2471° / 60°0.02
71 °
Long Lake, Saturday, 24 October
Light rain. High 71°, low 60°.
Pressure30.18 inHg
Wind9.2 mph SW
Humidity55%
Visibility—
Dew point53°
Sun, 2559° / 49°0.04
59 °
Long Lake, Sunday, 25 October
Light rain. High 59°, low 49°.
Pressure30.18 inHg
Wind11.4 mph N
Humidity58%
Visibility—
Dew point42°
Mon, 2655° / 43°0.77
55 °
Long Lake, Monday, 26 October
Rain. High 55°, low 43°.
Pressure30.03 inHg
Wind13.1 mph NW
Humidity43%
Visibility—
Dew point30°
Tue, 2759° / 43°0
59 °
Long Lake, Tuesday, 27 October
Clear. High 59°, low 43°.
Pressure30.15 inHg
Wind5.9 mph SW
Humidity44%
Visibility—
Dew point35°
Wed, 2859° / 44°0
59 °
Long Lake, Wednesday, 28 October
Partly cloudy. High 59°, low 44°.
Pressure29.91 inHg
Wind6.5 mph SW
Humidity45%
Visibility—
Dew point36°
Thu, 2958° / 45°0
58 °
Long Lake, Thursday, 29 October
Clear. High 58°, low 45°.
Pressure29.97 inHg
Wind15.6 mph NW
Humidity44%
Visibility—
Dew point34°
Fri, 3056° / 37°0
56 °
Long Lake, Friday, 30 October
Clear. High 56°, low 37°.
Pressure30.09 inHg
Wind11.9 mph S
Humidity37%
Visibility—
Dew point28°
From day 17 onward the outlook is built from 60-year climate statistics
Sat, 3154° / 43°0.12
54 °
Long Lake, Saturday, 31 October
Climate normal for this date — 60-year average.
Average high54°
Average low43°
Average precipitation0.12 in
Chance of precipitation42%
Record high71° (1974)
Record low28° (2019)
Sun, 0153° / 42°0.16
53 °
Long Lake, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high53°
Average low42°
Average precipitation0.16 in
Chance of precipitation45%
Record high71° (2016)
Record low20° (2019)
Mon, 0252° / 41°0.14
52 °
Long Lake, Monday, 2 November
Climate normal for this date — 60-year average.
Average high52°
Average low41°
Average precipitation0.14 in
Chance of precipitation37%
Record high72° (1961)
Record low23° (1991)
Tue, 0351° / 40°0.06
51 °
Long Lake, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high51°
Average low40°
Average precipitation0.06 in
Chance of precipitation30%
Record high70° (1987)
Record low17° (1991)
Wed, 0451° / 41°0.1
51 °
Long Lake, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high51°
Average low41°
Average precipitation0.1 in
Chance of precipitation32%
Record high69° (2022)
Record low15° (1991)
Thu, 0551° / 40°0.12
51 °
Long Lake, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high51°
Average low40°
Average precipitation0.12 in
Chance of precipitation28%
Record high71° (1978)
Record low20° (1991)
Fri, 0651° / 38°0.09
51 °
Long Lake, Friday, 6 November
Climate normal for this date — 60-year average.
Average high51°
Average low38°
Average precipitation0.09 in
Chance of precipitation30%
Record high70° (2020)
Record low22° (1991)
Sat, 0750° / 38°0.05
50 °
Long Lake, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high50°
Average low38°
Average precipitation0.05 in
Chance of precipitation18%
Record high68° (2020)
Record low14° (1991)
Sun, 0850° / 38°0.04
50 °
Long Lake, 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 °
Long Lake, 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 °
Long Lake, 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 °
Long Lake, 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 °
Long Lake, 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 °
Long Lake, 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)
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 Long Lake, 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 Long Lake, 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.