Monthly outlook for Cary, IL: average high 61°, average low 44.6°. That is 0.9° above the climate normal for October. Precipitation is expected on 5 days (about 1.0 inches), against a normal of 5 days and 1.7 inches. The warmest day looks like 12 October (84.3°), the coolest 18 October (24.4°).
61°/44.6°
Average high / low
+0.9°
Above normal
5 / 5
Wet days / normal
1.0 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
11 October – 20 October
62.3°
60.4°
+1°
21 October – 30 October
59°
56.8°
+1.2°
31 October – 9 November
at normal
52.2°
—
October records over 66 years
86.9°3 October 2025All-time high
23.4°26 October 1962All-time low
Climate normals and records are computed from the nearest reference point — Elgin (13 mi).
Mon, 1284° / 64°0
84 °
Cary, Monday, 12 October
Partly cloudy. High 84°, low 64°.
Pressure29.83 inHg
Wind11.7 mph SW
Humidity58%
Visibility6.2 mi
Dew point62°
Tue, 1377° / 64°0.22
77 °
Cary, Tuesday, 13 October
Heavy rain. High 77°, low 64°.
Pressure29.83 inHg
Wind10.4 mph W
Humidity67%
Visibility6.2 mi
Dew point64°
Wed, 1467° / 56°0.09
67 °
Cary, Wednesday, 14 October
Rain. High 67°, low 56°.
Pressure30.09 inHg
Wind6.9 mph NE
Humidity68%
Visibility6.2 mi
Dew point56°
Thu, 1558° / 55°0.32
58 °
Cary, Thursday, 15 October
Rain. High 58°, low 55°.
Pressure30.21 inHg
Wind12.5 mph E
Humidity81%
Visibility—
Dew point51°
Fri, 1658° / 40°0.09
58 °
Cary, Friday, 16 October
Light rain. High 58°, low 40°.
Pressure30.39 inHg
Wind17.4 mph N
Humidity49%
Visibility—
Dew point38°
Sat, 1741° / 32°0.01
41 °
Cary, Saturday, 17 October
Light snow. High 41°, low 32°.
Pressure30.36 inHg
Wind21.7 mph N
Humidity45%
Visibility—
Dew point19°
Sun, 1845° / 24°0
45 °
Cary, Sunday, 18 October
Mostly clear. High 45°, low 24°.
Pressure30.50 inHg
Wind8.4 mph N
Humidity33%
Visibility—
Dew point14°
Mon, 1955° / 33°0
55 °
Cary, Monday, 19 October
Partly cloudy. High 55°, low 33°.
Pressure30.24 inHg
Wind18.7 mph SW
Humidity41%
Visibility—
Dew point27°
Tue, 2061° / 40°0
61 °
Cary, Tuesday, 20 October
Clear. High 61°, low 40°.
Pressure30.15 inHg
Wind14.2 mph SW
Humidity45%
Visibility—
Dew point35°
Wed, 2165° / 45°0
65 °
Cary, Wednesday, 21 October
Clear. High 65°, low 45°.
Pressure30.15 inHg
Wind17.5 mph SW
Humidity41%
Visibility—
Dew point37°
Thu, 2266° / 47°0
66 °
Cary, Thursday, 22 October
Partly cloudy. High 66°, low 47°.
Pressure30.30 inHg
Wind10.4 mph NW
Humidity36%
Visibility—
Dew point37°
Fri, 2361° / 45°0
61 °
Cary, Friday, 23 October
Partly cloudy. High 61°, low 45°.
Pressure30.30 inHg
Wind19.3 mph S
Humidity46%
Visibility—
Dew point38°
Sat, 2458° / 42°0.26
58 °
Cary, Saturday, 24 October
Rain. High 58°, low 42°.
Pressure30.06 inHg
Wind20.9 mph W
Humidity59%
Visibility—
Dew point37°
Sun, 2550° / 35°0
50 °
Cary, Sunday, 25 October
Overcast. High 50°, low 35°.
Pressure30.36 inHg
Wind10.4 mph NW
Humidity50%
Visibility—
Dew point29°
Mon, 2654° / 38°0
54 °
Cary, Monday, 26 October
Clear. High 54°, low 38°.
Pressure30.06 inHg
Wind12.1 mph NW
Humidity51%
Visibility—
Dew point34°
From day 17 onward the outlook is built from 60-year climate statistics
Tue, 2756° / 42°0.08
56 °
Cary, Tuesday, 27 October
Climate normal for this date — 60-year average.
Average high56°
Average low42°
Average precipitation0.08 in
Chance of precipitation23%
Record high75° (2014)
Record low29° (1997)
Wed, 2855° / 42°0.04
55 °
Cary, Wednesday, 28 October
Climate normal for this date — 60-year average.
Average high55°
Average low42°
Average precipitation0.04 in
Chance of precipitation18%
Record high74° (1999)
Record low27° (1976)
Thu, 2955° / 41°0.05
55 °
Cary, Thursday, 29 October
Climate normal for this date — 60-year average.
Average high55°
Average low41°
Average precipitation0.05 in
Chance of precipitation20%
Record high78° (2024)
Record low25° (1980)
Fri, 3057° / 42°0.11
57 °
Cary, Friday, 30 October
Climate normal for this date — 60-year average.
Average high57°
Average low42°
Average precipitation0.11 in
Chance of precipitation28%
Record high76° (1971)
Record low24° (1988)
Sat, 3155° / 42°0.12
55 °
Cary, Saturday, 31 October
Climate normal for this date — 60-year average.
Average high55°
Average low42°
Average precipitation0.12 in
Chance of precipitation37%
Record high73° (1974)
Record low26° (2019)
Sun, 0154° / 41°0.17
54 °
Cary, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high54°
Average low41°
Average precipitation0.17 in
Chance of precipitation38%
Record high73° (2016)
Record low18° (2019)
Mon, 0253° / 40°0.11
53 °
Cary, Monday, 2 November
Climate normal for this date — 60-year average.
Average high53°
Average low40°
Average precipitation0.11 in
Chance of precipitation35%
Record high74° (1961)
Record low22° (1991)
Tue, 0352° / 39°0.06
52 °
Cary, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high52°
Average low39°
Average precipitation0.06 in
Chance of precipitation30%
Record high72° (1987)
Record low16° (1991)
Wed, 0452° / 40°0.09
52 °
Cary, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high52°
Average low40°
Average precipitation0.09 in
Chance of precipitation23%
Record high71° (2015)
Record low15° (1991)
Thu, 0552° / 39°0.12
52 °
Cary, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high52°
Average low39°
Average precipitation0.12 in
Chance of precipitation28%
Record high74° (1978)
Record low18° (1991)
Fri, 0652° / 37°0.08
52 °
Cary, Friday, 6 November
Climate normal for this date — 60-year average.
Average high52°
Average low37°
Average precipitation0.08 in
Chance of precipitation28%
Record high71° (1975)
Record low22° (1991)
Sat, 0751° / 37°0.04
51 °
Cary, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high51°
Average low37°
Average precipitation0.04 in
Chance of precipitation18%
Record high68° (2009)
Record low14° (1991)
Sun, 0850° / 37°0.05
50 °
Cary, Sunday, 8 November
Climate normal for this date — 60-year average.
Average high50°
Average low37°
Average precipitation0.05 in
Chance of precipitation18%
Record high72° (2020)
Record low13° (1991)
Mon, 0951° / 37°0.12
51 °
Cary, Monday, 9 November
Climate normal for this date — 60-year average.
Average high51°
Average low37°
Average precipitation0.12 in
Chance of precipitation32%
Record high72° (1999)
Record low17° (1991)
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 Cary, 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 Cary, 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.