Monthly outlook for Portage, IL: average high 63.8°, average low 50.5°. That is 6.6° above the climate normal for October. Precipitation is expected on 6 days (about 1.2 inches), against a normal of 4 days and 1.4 inches. The warmest day looks like 25 October (72.9°), the coolest 9 November (35.1°).
63.8°/50.5°
Average high / low
+6.6°
Above normal
6 / 4
Wet days / normal
1.2 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
25 October – 3 November
67.7°
53.3°
+8°
4 November – 13 November
57.1°
47.6°
+5.3°
14 November – 23 November
at normal
43.8°
—
October records over 66 years
85.6°3 October 2025All-time high
20.7°30 October 1988All-time low
Climate normals and records are computed from the nearest reference point — Benton (13 mi).
Mon, 2667° / 53°0
67 °
Portage, Monday, 26 October
Overcast. High 67°, low 53°.
Pressure30.33 inHg
Wind8.2 mph E
Humidity78%
Visibility6.2 mi
Dew point54°
Tue, 2770° / 50°0.06
70 °
Portage, Tuesday, 27 October
Light rain. High 70°, low 50°.
Pressure30.18 inHg
Wind8.7 mph SE
Humidity69%
Visibility6.2 mi
Dew point53°
Wed, 2871° / 56°0.17
71 °
Portage, Wednesday, 28 October
Rain. High 71°, low 56°.
Pressure30.09 inHg
Wind9.8 mph SW
Humidity66%
Visibility6.2 mi
Dew point54°
Thu, 2965° / 52°0.29
65 °
Portage, Thursday, 29 October
Rain. High 65°, low 52°.
Pressure30.15 inHg
Wind6.1 mph NE
Humidity65%
Visibility—
Dew point51°
Fri, 3068° / 52°0.08
68 °
Portage, Friday, 30 October
Light rain. High 68°, low 52°.
Pressure30.12 inHg
Wind9.4 mph SE
Humidity78%
Visibility—
Dew point59°
Sat, 3167° / 59°0.19
67 °
Portage, Saturday, 31 October
Rain. High 67°, low 59°.
Pressure29.97 inHg
Wind12.5 mph SW
Humidity76%
Visibility—
Dew point55°
Sun, 0168° / 60°0.43
68 °
Portage, Sunday, 1 November
Rain. High 68°, low 60°.
Pressure29.80 inHg
Wind17.1 mph SW
Humidity80%
Visibility—
Dew point59°
Mon, 0267° / 53°0
67 °
Portage, Monday, 2 November
Clear. High 67°, low 53°.
Pressure30.12 inHg
Wind6.2 mph NW
Humidity62%
Visibility—
Dew point51°
Tue, 0362° / 51°0
62 °
Portage, Tuesday, 3 November
Overcast. High 62°, low 51°.
Pressure30.12 inHg
Wind12.5 mph SE
Humidity60%
Visibility—
Dew point47°
Wed, 0461° / 50°0.01
61 °
Portage, Wednesday, 4 November
Light rain. High 61°, low 50°.
Pressure29.68 inHg
Wind12.3 mph W
Humidity72%
Visibility—
Dew point48°
Thu, 0553° / 44°0
53 °
Portage, Thursday, 5 November
Overcast. High 53°, low 44°.
Pressure30.09 inHg
Wind13 mph NW
Humidity50%
Visibility—
Dew point31°
Fri, 0662° / 42°0
62 °
Portage, Friday, 6 November
Overcast. High 62°, low 42°.
Pressure29.83 inHg
Wind15.7 mph S
Humidity58%
Visibility—
Dew point42°
Sat, 0767° / 55°0
67 °
Portage, Saturday, 7 November
Overcast. High 67°, low 55°.
Pressure29.50 inHg
Wind18.4 mph NW
Humidity64%
Visibility—
Dew point53°
Sun, 0853° / 42°0
53 °
Portage, Sunday, 8 November
Overcast. High 53°, low 42°.
Pressure30.00 inHg
Wind17 mph NW
Humidity49%
Visibility—
Dew point32°
Mon, 0947° / 35°0
47 °
Portage, Monday, 9 November
Clear. High 47°, low 35°.
Pressure30.30 inHg
Wind11.6 mph N
Humidity49%
Visibility—
Dew point27°
From day 17 onward the outlook is built from 60-year climate statistics
Tue, 1047° / 34°0.12
47 °
Portage, Tuesday, 10 November
Climate normal for this date — 60-year average.
Average high47°
Average low34°
Average precipitation0.12 in
Chance of precipitation30%
Record high70° (2022)
Record low14° (2017)
Wed, 1145° / 31°0.08
45 °
Portage, Wednesday, 11 November
Climate normal for this date — 60-year average.
Average high45°
Average low31°
Average precipitation0.08 in
Chance of precipitation28%
Record high69° (1964)
Record low13° (2019)
Thu, 1243° / 31°0.06
43 °
Portage, Thursday, 12 November
Climate normal for this date — 60-year average.
Average high43°
Average low31°
Average precipitation0.06 in
Chance of precipitation30%
Record high64° (1964)
Record low3° (2019)
Fri, 1344° / 31°0.05
44 °
Portage, Friday, 13 November
Climate normal for this date — 60-year average.
Average high44°
Average low31°
Average precipitation0.05 in
Chance of precipitation22%
Record high69° (1999)
Record low6° (1986)
Sat, 1445° / 32°0.04
45 °
Portage, Saturday, 14 November
Climate normal for this date — 60-year average.
Average high45°
Average low32°
Average precipitation0.04 in
Chance of precipitation28%
Record high65° (2001)
Record low14° (1986)
Sun, 1545° / 33°0.05
45 °
Portage, Sunday, 15 November
Climate normal for this date — 60-year average.
Average high45°
Average low33°
Average precipitation0.05 in
Chance of precipitation25%
Record high66° (2001)
Record low15° (2019)
Mon, 1645° / 32°0.06
45 °
Portage, Monday, 16 November
Climate normal for this date — 60-year average.
Average high45°
Average low32°
Average precipitation0.06 in
Chance of precipitation23%
Record high61° (1988)
Record low19° (1989)
Tue, 1745° / 33°0.1
45 °
Portage, Tuesday, 17 November
Climate normal for this date — 60-year average.
Average high45°
Average low33°
Average precipitation0.1 in
Chance of precipitation18%
Record high69° (2016)
Record low13° (2005)
Wed, 1845° / 32°0.09
45 °
Portage, Wednesday, 18 November
Climate normal for this date — 60-year average.
Average high45°
Average low32°
Average precipitation0.09 in
Chance of precipitation32%
Record high66° (1999)
Record low10° (2014)
Thu, 1945° / 32°0.06
45 °
Portage, Thursday, 19 November
Climate normal for this date — 60-year average.
Average high45°
Average low32°
Average precipitation0.06 in
Chance of precipitation25%
Record high63° (2020)
Record low11° (1986)
Fri, 2043° / 31°0.09
43 °
Portage, Friday, 20 November
Climate normal for this date — 60-year average.
Average high43°
Average low31°
Average precipitation0.09 in
Chance of precipitation32%
Record high62° (2003)
Record low13° (2022)
Sat, 2142° / 29°0.09
42 °
Portage, Saturday, 21 November
Climate normal for this date — 60-year average.
Average high42°
Average low29°
Average precipitation0.09 in
Chance of precipitation22%
Record high65° (1990)
Record low6° (1964)
Sun, 2242° / 29°0.03
42 °
Portage, Sunday, 22 November
Climate normal for this date — 60-year average.
Average high42°
Average low29°
Average precipitation0.03 in
Chance of precipitation18%
Record high60° (2012)
Record low3° (2015)
Mon, 2342° / 29°0.1
42 °
Portage, Monday, 23 November
Climate normal for this date — 60-year average.
Average high42°
Average low29°
Average precipitation0.1 in
Chance of precipitation32%
Record high60° (1966)
Record low9° (1970)
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 Portage, 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 Portage, 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.