Monthly outlook for Forest Park, IL: average high 63.5°, average low 51.5°. That is 5° above the climate normal for October. Precipitation is expected on 5 days (about 1.5 inches), against a normal of 5 days and 1.6 inches. The warmest day looks like 25 October (71.3°), the coolest 4 November (42.4°).
63.5°/51.5°
Average high / low
+5°
Above normal
5 / 5
Wet days / normal
1.5 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
24 October – 2 November
66.7°
55.9°
+6°
3 November – 12 November
58.2°
51°
+4°
13 November – 22 November
at normal
46.6°
—
October records over 66 years
89.8°3 October 2025All-time high
26.2°26 October 1962All-time low
Sun, 2571° / 49°0
71 °
Forest Park, Sunday, 25 October
Overcast. High 71°, low 49°.
Pressure30.42 inHg
Wind4.3 mph S
Humidity65%
Visibility6.2 mi
Dew point52°
Mon, 2662° / 50°0
62 °
Forest Park, Monday, 26 October
Overcast. High 62°, low 50°.
Pressure30.36 inHg
Wind4.8 mph NE
Humidity82%
Visibility6.2 mi
Dew point55°
Tue, 2766° / 51°0
66 °
Forest Park, Tuesday, 27 October
Light rain. High 66°, low 51°.
Pressure30.27 inHg
Wind3.9 mph SE
Humidity76%
Visibility6.2 mi
Dew point54°
Wed, 2869° / 53°0
69 °
Forest Park, Wednesday, 28 October
Clear. High 69°, low 53°.
Pressure30.21 inHg
Wind6.8 mph S
Humidity66%
Visibility6.2 mi
Dew point53°
Thu, 2970° / 57°0
70 °
Forest Park, Thursday, 29 October
Mostly clear. High 70°, low 57°.
Pressure30.12 inHg
Wind8.9 mph SW
Humidity62%
Visibility—
Dew point54°
Fri, 3061° / 55°0
61 °
Forest Park, Friday, 30 October
Overcast. High 61°, low 55°.
Pressure30.30 inHg
Wind10.4 mph NE
Humidity51%
Visibility—
Dew point41°
Sat, 3168° / 56°0
68 °
Forest Park, Saturday, 31 October
Overcast. High 68°, low 56°.
Pressure30.24 inHg
Wind7.6 mph SE
Humidity45%
Visibility—
Dew point42°
Sun, 0169° / 56°0.61
69 °
Forest Park, Sunday, 1 November
Rain. High 69°, low 56°.
Pressure29.88 inHg
Wind13 mph S
Humidity52%
Visibility—
Dew point49°
Mon, 0261° / 52°0.44
61 °
Forest Park, Monday, 2 November
Rain. High 61°, low 52°.
Pressure29.74 inHg
Wind16.3 mph N
Humidity70%
Visibility—
Dew point50°
Tue, 0354° / 46°0
54 °
Forest Park, Tuesday, 3 November
Clear. High 54°, low 46°.
Pressure30.06 inHg
Wind9.6 mph NW
Humidity33%
Visibility—
Dew point24°
Wed, 0452° / 42°0
52 °
Forest Park, Wednesday, 4 November
Clear. High 52°, low 42°.
Pressure30.18 inHg
Wind5.5 mph W
Humidity26%
Visibility—
Dew point16°
Thu, 0557° / 44°0
57 °
Forest Park, Thursday, 5 November
Overcast. High 57°, low 44°.
Pressure30.24 inHg
Wind11.7 mph S
Humidity40%
Visibility—
Dew point28°
Fri, 0661° / 54°0.14
61 °
Forest Park, Friday, 6 November
Light rain. High 61°, low 54°.
Pressure30.09 inHg
Wind11.7 mph S
Humidity46%
Visibility—
Dew point40°
Sat, 0764° / 56°0.1
64 °
Forest Park, Saturday, 7 November
Light rain. High 64°, low 56°.
Pressure29.97 inHg
Wind12.3 mph S
Humidity49%
Visibility—
Dew point42°
Sun, 0861° / 53°0.16
61 °
Forest Park, Sunday, 8 November
Light rain. High 61°, low 53°.
Pressure29.94 inHg
Wind14 mph NW
Humidity36%
Visibility—
Dew point32°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 0952° / 39°0.13
52 °
Forest Park, 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 °
Forest Park, 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 °
Forest Park, 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, 1246° / 35°0.06
46 °
Forest Park, Thursday, 12 November
Climate normal for this date — 60-year average.
Average high46°
Average low35°
Average precipitation0.06 in
Chance of precipitation22%
Record high67° (1964)
Record low3° (2019)
Fri, 1347° / 35°0.06
47 °
Forest Park, Friday, 13 November
Climate normal for this date — 60-year average.
Average high47°
Average low35°
Average precipitation0.06 in
Chance of precipitation20%
Record high68° (1999)
Record low2° (2019)
Sat, 1448° / 35°0.07
48 °
Forest Park, Saturday, 14 November
Climate normal for this date — 60-year average.
Average high48°
Average low35°
Average precipitation0.07 in
Chance of precipitation33%
Record high68° (1971)
Record low15° (1986)
Sun, 1547° / 36°0.1
47 °
Forest Park, 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)
Mon, 1647° / 35°0.05
47 °
Forest Park, Monday, 16 November
Climate normal for this date — 60-year average.
Average high47°
Average low35°
Average precipitation0.05 in
Chance of precipitation25%
Record high63° (2023)
Record low22° (1997)
Tue, 1747° / 35°0.09
47 °
Forest Park, Tuesday, 17 November
Climate normal for this date — 60-year average.
Average high47°
Average low35°
Average precipitation0.09 in
Chance of precipitation32%
Record high69° (2016)
Record low16° (2014)
Wed, 1848° / 36°0.15
48 °
Forest Park, Wednesday, 18 November
Climate normal for this date — 60-year average.
Average high48°
Average low36°
Average precipitation0.15 in
Chance of precipitation30%
Record high66° (2016)
Record low12° (2014)
Thu, 1947° / 36°0.08
47 °
Forest Park, Thursday, 19 November
Climate normal for this date — 60-year average.
Average high47°
Average low36°
Average precipitation0.08 in
Chance of precipitation35%
Record high64° (2020)
Record low19° (2014)
Fri, 2046° / 35°0.1
46 °
Forest Park, Friday, 20 November
Climate normal for this date — 60-year average.
Average high46°
Average low35°
Average precipitation0.1 in
Chance of precipitation37%
Record high62° (2003)
Record low14° (2022)
Sat, 2144° / 33°0.1
44 °
Forest Park, Saturday, 21 November
Climate normal for this date — 60-year average.
Average high44°
Average low33°
Average precipitation0.1 in
Chance of precipitation27%
Record high66° (1990)
Record low11° (1964)
Sun, 2245° / 32°0.05
45 °
Forest Park, Sunday, 22 November
Climate normal for this date — 60-year average.
Average high45°
Average low32°
Average precipitation0.05 in
Chance of precipitation18%
Record high67° (2010)
Record low11° (2015)
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 Forest Park, 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 Forest Park, 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.