Monthly outlook for Genoa, IL: average high 66.3°, average low 49.2°. That is 2.9° above the climate normal for October. Precipitation is expected on 3 days (about 0.6 inches), against a normal of 5 days and 1.6 inches. The warmest day looks like 15 October (86.2°), the coolest 21 October (36.8°).
66.3°/49.2°
Average high / low
+2.9°
Above normal
3 / 5
Wet days / normal
0.6 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
8 October – 17 October
71.8°
62.3°
+5.3°
18 October – 27 October
57.2°
57.9°
-0.4°
28 October – 6 November
at normal
53.8°
—
October records over 66 years
87.1°3 October 2025All-time high
22.1°24 October 1981All-time low
Climate normals and records are computed from the nearest reference point — Sycamore (7 mi).
Fri, 0972° / 50°0.1
72 °
Genoa, Friday, 9 October
Rain. High 72°, low 50°.
Pressure30.12 inHg
Wind8.2 mph SE
Humidity50%
Visibility6.2 mi
Dew point48°
Sat, 1078° / 61°0
78 °
Genoa, Saturday, 10 October
Overcast. High 78°, low 61°.
Pressure30.09 inHg
Wind10.7 mph S
Humidity51%
Visibility6.2 mi
Dew point57°
Sun, 1173° / 58°0
73 °
Genoa, Sunday, 11 October
Clear. High 73°, low 58°.
Pressure30.00 inHg
Wind5.2 mph SE
Humidity61%
Visibility6.2 mi
Dew point56°
Mon, 1281° / 56°0
81 °
Genoa, Monday, 12 October
Overcast. High 81°, low 56°.
Pressure29.83 inHg
Wind11.6 mph S
Humidity54%
Visibility—
Dew point57°
Tue, 1371° / 54°0
71 °
Genoa, Tuesday, 13 October
Overcast. High 71°, low 54°.
Pressure29.91 inHg
Wind12.6 mph NW
Humidity60%
Visibility—
Dew point53°
Wed, 1460° / 46°0
60 °
Genoa, Wednesday, 14 October
Overcast. High 60°, low 46°.
Pressure30.09 inHg
Wind15.5 mph SE
Humidity59%
Visibility—
Dew point39°
Thu, 1586° / 58°0.45
86 °
Genoa, Thursday, 15 October
Rain. High 86°, low 58°.
Pressure29.77 inHg
Wind21.1 mph SW
Humidity54%
Visibility—
Dew point61°
Fri, 1670° / 52°0.07
70 °
Genoa, Friday, 16 October
Light rain. High 70°, low 52°.
Pressure30.06 inHg
Wind18 mph W
Humidity51%
Visibility—
Dew point45°
Sat, 1755° / 43°0
55 °
Genoa, Saturday, 17 October
Overcast. High 55°, low 43°.
Pressure30.45 inHg
Wind11.4 mph NE
Humidity62%
Visibility—
Dew point40°
Sun, 1853° / 46°0
53 °
Genoa, Sunday, 18 October
Overcast. High 53°, low 46°.
Pressure30.27 inHg
Wind8.9 mph W
Humidity56%
Visibility—
Dew point35°
Mon, 1959° / 42°0
59 °
Genoa, Monday, 19 October
Partly cloudy. High 59°, low 42°.
Pressure30.27 inHg
Wind10.5 mph SW
Humidity49%
Visibility—
Dew point36°
Tue, 2060° / 44°0
60 °
Genoa, Tuesday, 20 October
Mostly clear. High 60°, low 44°.
Pressure30.15 inHg
Wind13 mph N
Humidity46%
Visibility—
Dew point37°
Wed, 2156° / 37°0
56 °
Genoa, Wednesday, 21 October
Clear. High 56°, low 37°.
Pressure30.24 inHg
Wind9.1 mph NE
Humidity51%
Visibility—
Dew point34°
Thu, 2262° / 40°0
62 °
Genoa, Thursday, 22 October
Partly cloudy. High 62°, low 40°.
Pressure29.74 inHg
Wind16.8 mph S
Humidity49%
Visibility—
Dew point39°
Fri, 2353° / 50°0.02
53 °
Genoa, Friday, 23 October
Light rain. High 53°, low 50°.
Pressure29.74 inHg
Wind13 mph S
Humidity70%
Visibility—
Dew point42°
From day 17 onward the outlook is built from 60-year climate statistics
Sat, 2457° / 44°0.11
57 °
Genoa, Saturday, 24 October
Climate normal for this date — 60-year average.
Average high57°
Average low44°
Average precipitation0.11 in
Chance of precipitation38%
Record high78° (1963)
Record low22° (1981)
Sun, 2557° / 42°0.1
57 °
Genoa, Sunday, 25 October
Climate normal for this date — 60-year average.
Average high57°
Average low42°
Average precipitation0.1 in
Chance of precipitation27%
Record high75° (1989)
Record low27° (2006)
Mon, 2656° / 42°0.09
56 °
Genoa, Monday, 26 October
Climate normal for this date — 60-year average.
Average high56°
Average low42°
Average precipitation0.09 in
Chance of precipitation23%
Record high79° (1963)
Record low22° (1962)
Tue, 2756° / 41°0.08
56 °
Genoa, Tuesday, 27 October
Climate normal for this date — 60-year average.
Average high56°
Average low41°
Average precipitation0.08 in
Chance of precipitation22%
Record high75° (2014)
Record low27° (1997)
Wed, 2855° / 41°0.04
55 °
Genoa, Wednesday, 28 October
Climate normal for this date — 60-year average.
Average high55°
Average low41°
Average precipitation0.04 in
Chance of precipitation17%
Record high74° (1999)
Record low25° (1976)
Thu, 2955° / 40°0.06
55 °
Genoa, Thursday, 29 October
Climate normal for this date — 60-year average.
Average high55°
Average low40°
Average precipitation0.06 in
Chance of precipitation18%
Record high78° (2024)
Record low23° (1980)
Fri, 3057° / 41°0.1
57 °
Genoa, Friday, 30 October
Climate normal for this date — 60-year average.
Average high57°
Average low41°
Average precipitation0.1 in
Chance of precipitation27%
Record high77° (1971)
Record low22° (1988)
Sat, 3155° / 42°0.11
55 °
Genoa, Saturday, 31 October
Climate normal for this date — 60-year average.
Average high55°
Average low42°
Average precipitation0.11 in
Chance of precipitation42%
Record high73° (1974)
Record low26° (2019)
Sun, 0154° / 40°0.17
54 °
Genoa, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high54°
Average low40°
Average precipitation0.17 in
Chance of precipitation38%
Record high73° (2000)
Record low18° (2019)
Mon, 0253° / 39°0.1
53 °
Genoa, Monday, 2 November
Climate normal for this date — 60-year average.
Average high53°
Average low39°
Average precipitation0.1 in
Chance of precipitation33%
Record high74° (1961)
Record low21° (1991)
Tue, 0352° / 38°0.07
52 °
Genoa, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high52°
Average low38°
Average precipitation0.07 in
Chance of precipitation28%
Record high72° (1964)
Record low16° (1991)
Wed, 0452° / 40°0.1
52 °
Genoa, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high52°
Average low40°
Average precipitation0.1 in
Chance of precipitation25%
Record high71° (2015)
Record low14° (1991)
Thu, 0552° / 38°0.11
52 °
Genoa, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high52°
Average low38°
Average precipitation0.11 in
Chance of precipitation27%
Record high73° (1978)
Record low17° (1991)
Fri, 0651° / 37°0.09
51 °
Genoa, Friday, 6 November
Climate normal for this date — 60-year average.
Average high51°
Average low37°
Average precipitation0.09 in
Chance of precipitation27%
Record high71° (1975)
Record low22° (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 Genoa, 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 Genoa, 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.