Monthly outlook for Genoa, IL: average high 64.8°, average low 48.9°. That is 2.1° above the climate normal for October. Precipitation is expected on 2 days (about 1.7 inches), against a normal of 5 days and 1.6 inches. The warmest day looks like 12 October (81.6°), the coolest 18 October (36.9°).
64.8°/48.9°
Average high / low
+2.1°
Above normal
2 / 5
Wet days / normal
1.7 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
8 October – 17 October
69.8°
62.3°
+4.2°
18 October – 27 October
56.5°
57.9°
-0.8°
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, 0974° / 52°0.09
74 °
Genoa, Friday, 9 October
Rain. High 74°, low 52°.
Pressure30.12 inHg
Wind8.4 mph SE
Humidity57%
Visibility6.2 mi
Dew point52°
Sat, 1077° / 57°0
77 °
Genoa, Saturday, 10 October
Overcast. High 77°, low 57°.
Pressure30.09 inHg
Wind10.1 mph S
Humidity56%
Visibility6.2 mi
Dew point55°
Sun, 1172° / 55°0
72 °
Genoa, Sunday, 11 October
Clear. High 72°, low 55°.
Pressure29.94 inHg
Wind1.8 mph E
Humidity67%
Visibility6.2 mi
Dew point57°
Mon, 1282° / 59°0
82 °
Genoa, Monday, 12 October
Clear. High 82°, low 59°.
Pressure29.80 inHg
Wind10.8 mph SW
Humidity57%
Visibility6.2 mi
Dew point61°
Tue, 1372° / 60°0.03
72 °
Genoa, Tuesday, 13 October
Light rain. High 72°, low 60°.
Pressure29.85 inHg
Wind10.4 mph NW
Humidity78%
Visibility—
Dew point62°
Wed, 1462° / 54°0
62 °
Genoa, Wednesday, 14 October
Overcast. High 62°, low 54°.
Pressure30.09 inHg
Wind13 mph E
Humidity65%
Visibility—
Dew point49°
Thu, 1576° / 54°1.58
76 °
Genoa, Thursday, 15 October
Heavy rain. High 76°, low 54°.
Pressure29.77 inHg
Wind19.1 mph SW
Humidity78%
Visibility—
Dew point66°
Fri, 1662° / 48°0
62 °
Genoa, Friday, 16 October
Overcast. High 62°, low 48°.
Pressure30.15 inHg
Wind17.5 mph NW
Humidity66%
Visibility—
Dew point42°
Sat, 1749° / 38°0
49 °
Genoa, Saturday, 17 October
Clear. High 49°, low 38°.
Pressure30.47 inHg
Wind15 mph N
Humidity45%
Visibility—
Dew point26°
Sun, 1851° / 37°0
51 °
Genoa, Sunday, 18 October
Overcast. High 51°, low 37°.
Pressure30.50 inHg
Wind5.7 mph NE
Humidity53%
Visibility—
Dew point31°
Mon, 1957° / 38°0
57 °
Genoa, Monday, 19 October
Clear. High 57°, low 38°.
Pressure30.50 inHg
Wind7.8 mph E
Humidity46%
Visibility—
Dew point33°
Tue, 2050° / 47°0
50 °
Genoa, Tuesday, 20 October
Overcast. High 50°, low 47°.
Pressure30.33 inHg
Wind7.9 mph SE
Humidity62%
Visibility—
Dew point37°
Wed, 2164° / 45°0
64 °
Genoa, Wednesday, 21 October
Clear. High 64°, low 45°.
Pressure30.15 inHg
Wind12.3 mph SW
Humidity65%
Visibility—
Dew point48°
Thu, 2262° / 48°0
62 °
Genoa, Thursday, 22 October
Clear. High 62°, low 48°.
Pressure30.18 inHg
Wind10.1 mph N
Humidity62%
Visibility—
Dew point47°
Fri, 2356° / 44°0
56 °
Genoa, Friday, 23 October
Mostly clear. High 56°, low 44°.
Pressure30.33 inHg
Wind9.4 mph NE
Humidity49%
Visibility—
Dew point35°
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.