Monthly outlook for Cicero, IL: average high 66.5°, average low 51°. That is 4.9° above the climate normal for October. Precipitation is expected on 4 days (about 0.9 inches), against a normal of 5 days and 1.7 inches. The warmest day looks like 27 October (75.8°), the coolest 17 October (36.1°).
66.5°/51°
Average high / low
+4.9°
Above normal
4 / 5
Wet days / normal
0.9 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
17 October – 26 October
65.7°
58.7°
+3.9°
27 October – 5 November
67.9°
54.9°
+7.2°
6 November – 15 November
at normal
49.5°
—
October records over 66 years
89.8°3 October 2025All-time high
25.7°26 October 1962All-time low
Sun, 1860° / 43°0
60 °
Cicero, Sunday, 18 October
Clear. High 60°, low 43°.
Pressure30.45 inHg
Wind10 mph SW
Humidity57%
Visibility6.2 mi
Dew point41°
Mon, 1963° / 41°0
63 °
Cicero, Monday, 19 October
Partly cloudy. High 63°, low 41°.
Pressure30.42 inHg
Wind2.5 mph SW
Humidity61%
Visibility6.2 mi
Dew point46°
Tue, 2064° / 43°0
64 °
Cicero, Tuesday, 20 October
Clear. High 64°, low 43°.
Pressure30.39 inHg
Wind2.6 mph SE
Humidity55%
Visibility6.2 mi
Dew point46°
Wed, 2167° / 46°0
67 °
Cicero, Wednesday, 21 October
Clear. High 67°, low 46°.
Pressure30.27 inHg
Wind2.8 mph S
Humidity63%
Visibility6.2 mi
Dew point50°
Thu, 2267° / 48°0
67 °
Cicero, Thursday, 22 October
Clear. High 67°, low 48°.
Pressure30.27 inHg
Wind5.2 mph NE
Humidity63%
Visibility—
Dew point51°
Fri, 2373° / 56°0
73 °
Cicero, Friday, 23 October
Clear. High 73°, low 56°.
Pressure30.18 inHg
Wind6.4 mph SE
Humidity31%
Visibility—
Dew point37°
Sat, 2472° / 60°0
72 °
Cicero, Saturday, 24 October
Overcast. High 72°, low 60°.
Pressure30.15 inHg
Wind10.8 mph S
Humidity29%
Visibility—
Dew point36°
Sun, 2573° / 59°0
73 °
Cicero, Sunday, 25 October
Overcast. High 73°, low 59°.
Pressure30.00 inHg
Wind12.6 mph W
Humidity48%
Visibility—
Dew point51°
Mon, 2665° / 53°0
65 °
Cicero, Monday, 26 October
Clear. High 65°, low 53°.
Pressure30.21 inHg
Wind6.3 mph NW
Humidity42%
Visibility—
Dew point39°
Tue, 2776° / 57°0
76 °
Cicero, Tuesday, 27 October
Overcast. High 76°, low 57°.
Pressure30.00 inHg
Wind12.9 mph S
Humidity39%
Visibility—
Dew point47°
Wed, 2869° / 63°0.12
69 °
Cicero, Wednesday, 28 October
Light rain. High 69°, low 63°.
Pressure29.91 inHg
Wind13.4 mph SW
Humidity46%
Visibility—
Dew point45°
Thu, 2964° / 54°0.07
64 °
Cicero, Thursday, 29 October
Light rain. High 64°, low 54°.
Pressure30.12 inHg
Wind12.1 mph W
Humidity30%
Visibility—
Dew point30°
Fri, 3068° / 57°0.56
68 °
Cicero, Friday, 30 October
Rain. High 68°, low 57°.
Pressure29.77 inHg
Wind13.9 mph S
Humidity96%
Visibility—
Dew point60°
Sat, 3171° / 52°0.15
71 °
Cicero, Saturday, 31 October
Light rain. High 71°, low 52°.
Pressure29.62 inHg
Wind19.9 mph SW
Humidity38%
Visibility—
Dew point39°
Sun, 0159° / 48°0
59 °
Cicero, Sunday, 1 November
Overcast. High 59°, low 48°.
Pressure30.15 inHg
Wind9.2 mph W
Humidity23%
Visibility—
Dew point19°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 0254° / 42°0.12
54 °
Cicero, 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 °
Cicero, 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 low18° (1991)
Wed, 0453° / 42°0.09
53 °
Cicero, 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 °
Cicero, 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 °
Cicero, 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 °
Cicero, 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 low20° (1991)
Sun, 0851° / 39°0.06
51 °
Cicero, 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 °
Cicero, Monday, 9 November
Climate normal for this date — 60-year average.
Average high52°
Average low39°
Average precipitation0.13 in
Chance of precipitation35%
Record high73° (2020)
Record low20° (1991)
Tue, 1050° / 38°0.13
50 °
Cicero, Tuesday, 10 November
Climate normal for this date — 60-year average.
Average high50°
Average low38°
Average precipitation0.13 in
Chance of precipitation40%
Record high74° (2020)
Record low18° (2018)
Wed, 1148° / 36°0.08
48 °
Cicero, 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 °
Cicero, 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 low3° (2019)
Fri, 1347° / 34°0.06
47 °
Cicero, Friday, 13 November
Climate normal for this date — 60-year average.
Average high47°
Average low34°
Average precipitation0.06 in
Chance of precipitation20%
Record high69° (1999)
Record low2° (2019)
Sat, 1448° / 35°0.07
48 °
Cicero, Saturday, 14 November
Climate normal for this date — 60-year average.
Average high48°
Average low35°
Average precipitation0.07 in
Chance of precipitation33%
Record high69° (1971)
Record low14° (1986)
Sun, 1547° / 36°0.1
47 °
Cicero, Sunday, 15 November
Climate normal for this date — 60-year average.
Average high47°
Average low36°
Average precipitation0.1 in
Chance of precipitation33%
Record high68° (2025)
Record low20° (1982)
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 Cicero, 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 Cicero, 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.