Monthly outlook for McCook, IL: average high 63.4°, average low 50.5°. That is 2.6° above the climate normal for October. Precipitation is expected on 5 days (about 0.7 inches), against a normal of 5 days and 1.7 inches. The warmest day looks like 24 October (76.5°), the coolest 17 October (38.9°).
63.4°/50.5°
Average high / low
+2.6°
Above normal
5 / 5
Wet days / normal
0.7 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
14 October – 23 October
64.2°
60.1°
+2.3°
24 October – 2 November
62°
56.2°
+3.2°
3 November – 12 November
at normal
51.3°
—
October records over 66 years
89.2°3 October 2025All-time high
25.7°26 October 1962All-time low
Climate normals and records are computed from the nearest reference point — Summit (1 mi).
Thu, 1566° / 58°0.22
66 °
McCook, Thursday, 15 October
Rain. High 66°, low 58°.
Pressure30.03 inHg
Wind5.7 mph E
Humidity82%
Visibility6.2 mi
Dew point56°
Fri, 1660° / 46°0.06
60 °
McCook, Friday, 16 October
Light rain. High 60°, low 46°.
Pressure30.03 inHg
Wind12.5 mph NW
Humidity71%
Visibility6.2 mi
Dew point45°
Sat, 1755° / 39°0
55 °
McCook, Saturday, 17 October
Clear. High 55°, low 39°.
Pressure30.53 inHg
Wind2.1 mph NW
Humidity60%
Visibility6.2 mi
Dew point38°
Sun, 1860° / 42°0
60 °
McCook, Sunday, 18 October
Clear. High 60°, low 42°.
Pressure30.47 inHg
Wind9.1 mph SW
Humidity59%
Visibility6.2 mi
Dew point41°
Mon, 1962° / 41°0
62 °
McCook, Monday, 19 October
Clear. High 62°, low 41°.
Pressure30.42 inHg
Wind6 mph SW
Humidity51%
Visibility—
Dew point40°
Tue, 2070° / 46°0
70 °
McCook, Tuesday, 20 October
Mostly clear. High 70°, low 46°.
Pressure30.33 inHg
Wind3.7 mph E
Humidity34%
Visibility—
Dew point35°
Wed, 2173° / 56°0
73 °
McCook, Wednesday, 21 October
Clear. High 73°, low 56°.
Pressure30.24 inHg
Wind10 mph S
Humidity45%
Visibility—
Dew point47°
Thu, 2266° / 64°0.16
66 °
McCook, Thursday, 22 October
Light rain. High 66°, low 64°.
Pressure29.97 inHg
Wind12 mph SW
Humidity80%
Visibility—
Dew point59°
Fri, 2366° / 60°0
66 °
McCook, Friday, 23 October
Overcast. High 66°, low 60°.
Pressure30.09 inHg
Wind7.1 mph NW
Humidity81%
Visibility—
Dew point57°
Sat, 2477° / 55°0.05
77 °
McCook, Saturday, 24 October
Light rain. High 77°, low 55°.
Pressure29.85 inHg
Wind14.7 mph SW
Humidity49%
Visibility—
Dew point54°
Sun, 2558° / 49°0
58 °
McCook, Sunday, 25 October
Clear. High 58°, low 49°.
Pressure30.33 inHg
Wind10.2 mph W
Humidity30%
Visibility—
Dew point25°
Mon, 2655° / 46°0
55 °
McCook, Monday, 26 October
Clear. High 55°, low 46°.
Pressure30.39 inHg
Wind7.5 mph NW
Humidity31%
Visibility—
Dew point24°
Tue, 2759° / 46°0
59 °
McCook, Tuesday, 27 October
Overcast. High 59°, low 46°.
Pressure30.27 inHg
Wind10 mph SW
Humidity32%
Visibility—
Dew point26°
Wed, 2862° / 50°0
62 °
McCook, Wednesday, 28 October
Overcast. High 62°, low 50°.
Pressure30.06 inHg
Wind10 mph SW
Humidity25%
Visibility—
Dew point24°
Thu, 2962° / 51°0
62 °
McCook, Thursday, 29 October
Overcast. High 62°, low 51°.
Pressure30.00 inHg
Wind9.4 mph W
Humidity59%
Visibility—
Dew point44°
From day 17 onward the outlook is built from 60-year climate statistics
Fri, 3058° / 44°0.12
58 °
McCook, Friday, 30 October
Climate normal for this date — 60-year average.
Average high58°
Average low44°
Average precipitation0.12 in
Chance of precipitation28%
Record high78° (2024)
Record low28° (1988)
Sat, 3156° / 44°0.13
56 °
McCook, Saturday, 31 October
Climate normal for this date — 60-year average.
Average high56°
Average low44°
Average precipitation0.13 in
Chance of precipitation42%
Record high74° (1974)
Record low26° (2023)
Sun, 0155° / 43°0.18
55 °
McCook, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high55°
Average low43°
Average precipitation0.18 in
Chance of precipitation42%
Record high73° (2016)
Record low19° (2019)
Mon, 0254° / 42°0.12
54 °
McCook, Monday, 2 November
Climate normal for this date — 60-year average.
Average high54°
Average low42°
Average precipitation0.12 in
Chance of precipitation40%
Record high74° (1961)
Record low24° (1991)
Tue, 0353° / 40°0.07
53 °
McCook, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high53°
Average low40°
Average precipitation0.07 in
Chance of precipitation27%
Record high72° (1987)
Record low19° (1991)
Wed, 0453° / 42°0.09
53 °
McCook, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high53°
Average low42°
Average precipitation0.09 in
Chance of precipitation28%
Record high71° (2015)
Record low18° (1991)
Thu, 0553° / 41°0.12
53 °
McCook, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high53°
Average low41°
Average precipitation0.12 in
Chance of precipitation32%
Record high75° (1978)
Record low20° (1991)
Fri, 0653° / 39°0.07
53 °
McCook, Friday, 6 November
Climate normal for this date — 60-year average.
Average high53°
Average low39°
Average precipitation0.07 in
Chance of precipitation32%
Record high72° (1975)
Record low25° (1991)
Sat, 0752° / 39°0.06
52 °
McCook, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high52°
Average low39°
Average precipitation0.06 in
Chance of precipitation22%
Record high70° (2020)
Record low21° (1991)
Sun, 0851° / 39°0.06
51 °
McCook, Sunday, 8 November
Climate normal for this date — 60-year average.
Average high51°
Average low39°
Average precipitation0.06 in
Chance of precipitation20%
Record high75° (2020)
Record low16° (1991)
Mon, 0952° / 39°0.13
52 °
McCook, Monday, 9 November
Climate normal for this date — 60-year average.
Average high52°
Average low39°
Average precipitation0.13 in
Chance of precipitation35%
Record high72° (2020)
Record low20° (1991)
Tue, 1051° / 38°0.13
51 °
McCook, Tuesday, 10 November
Climate normal for this date — 60-year average.
Average high51°
Average low38°
Average precipitation0.13 in
Chance of precipitation40%
Record high74° (2020)
Record low18° (2018)
Wed, 1148° / 36°0.08
48 °
McCook, Wednesday, 11 November
Climate normal for this date — 60-year average.
Average high48°
Average low36°
Average precipitation0.08 in
Chance of precipitation30%
Record high70° (1964)
Record low17° (2019)
Thu, 1247° / 35°0.06
47 °
McCook, Thursday, 12 November
Climate normal for this date — 60-year average.
Average high47°
Average low35°
Average precipitation0.06 in
Chance of precipitation22%
Record high68° (1964)
Record low4° (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 McCook, 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 McCook, 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.