Monthly outlook for Glen Oak, IL: average high 58.7°, average low 43.2°. That is 1.3° above the climate normal for October. Precipitation is expected on 1 day (about 0.3 inches), against a normal of 5 days and 1.5 inches. The warmest day looks like 21 October (70.2°), the coolest 29 October (32.4°).
58.7°/43.2°
Average high / low
+1.3°
Above normal
1 / 5
Wet days / normal
0.3 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
19 October – 28 October
61.5°
57.4°
+2.3°
29 October – 7 November
53.9°
53.5°
+0.2°
8 November – 17 November
at normal
47.9°
—
October records over 66 years
87.4°3 October 2025All-time high
22.5°24 October 1981All-time low
Climate normals and records are computed from the nearest reference point — Glendale Heights (3 mi).
Tue, 2068° / 44°0
68 °
Glen Oak, Tuesday, 20 October
Clear. High 68°, low 44°.
Pressure30.39 inHg
Wind3 mph SE
Humidity54%
Visibility6.2 mi
Dew point47°
Wed, 2170° / 44°0
70 °
Glen Oak, Wednesday, 21 October
Clear. High 70°, low 44°.
Pressure30.27 inHg
Wind3.1 mph SW
Humidity55%
Visibility6.2 mi
Dew point48°
Thu, 2267° / 49°0.01
67 °
Glen Oak, Thursday, 22 October
Light rain. High 67°, low 49°.
Pressure30.33 inHg
Wind3.6 mph NE
Humidity66%
Visibility6.2 mi
Dew point55°
Fri, 2360° / 45°0
60 °
Glen Oak, Friday, 23 October
Partly cloudy. High 60°, low 45°.
Pressure30.39 inHg
Wind5.3 mph SE
Humidity73%
Visibility6.2 mi
Dew point48°
Sat, 2460° / 43°0
60 °
Glen Oak, Saturday, 24 October
Overcast. High 60°, low 43°.
Pressure30.45 inHg
Wind6.9 mph SE
Humidity59%
Visibility—
Dew point42°
Sun, 2566° / 47°0
66 °
Glen Oak, Sunday, 25 October
Overcast. High 66°, low 47°.
Pressure30.30 inHg
Wind9 mph SW
Humidity56%
Visibility—
Dew point45°
Mon, 2660° / 52°0.01
60 °
Glen Oak, Monday, 26 October
Light rain. High 60°, low 52°.
Pressure30.33 inHg
Wind8.2 mph N
Humidity28%
Visibility—
Dew point25°
Tue, 2754° / 41°0.01
54 °
Glen Oak, Tuesday, 27 October
Light rain. High 54°, low 41°.
Pressure30.33 inHg
Wind13.1 mph N
Humidity35%
Visibility—
Dew point26°
Wed, 2843° / 33°0
43 °
Glen Oak, Wednesday, 28 October
Clear. High 43°, low 33°.
Pressure30.47 inHg
Wind10.6 mph N
Humidity34%
Visibility—
Dew point14°
Thu, 2948° / 32°0
48 °
Glen Oak, Thursday, 29 October
Clear. High 48°, low 32°.
Pressure30.39 inHg
Wind7.9 mph W
Humidity25%
Visibility—
Dew point11°
Fri, 3053° / 35°0
53 °
Glen Oak, Friday, 30 October
Overcast. High 53°, low 35°.
Pressure30.24 inHg
Wind13.9 mph SW
Humidity31%
Visibility—
Dew point19°
Sat, 3160° / 44°0
60 °
Glen Oak, Saturday, 31 October
Overcast. High 60°, low 44°.
Pressure30.06 inHg
Wind14.8 mph SW
Humidity39%
Visibility—
Dew point31°
Sun, 0159° / 50°0
59 °
Glen Oak, Sunday, 1 November
Overcast. High 59°, low 50°.
Pressure30.09 inHg
Wind9.6 mph SW
Humidity53%
Visibility—
Dew point40°
Mon, 0251° / 45°0.31
51 °
Glen Oak, Monday, 2 November
Rain. High 51°, low 45°.
Pressure30.18 inHg
Wind10.8 mph NE
Humidity88%
Visibility—
Dew point42°
Tue, 0353° / 46°0.01
53 °
Glen Oak, Tuesday, 3 November
Light rain. High 53°, low 46°.
Pressure30.12 inHg
Wind7.3 mph NE
Humidity72%
Visibility—
Dew point41°
From day 17 onward the outlook is built from 60-year climate statistics
Wed, 0452° / 41°0.09
52 °
Glen Oak, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high52°
Average low41°
Average precipitation0.09 in
Chance of precipitation23%
Record high71° (2015)
Record low15° (1991)
Thu, 0552° / 39°0.11
52 °
Glen Oak, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high52°
Average low39°
Average precipitation0.11 in
Chance of precipitation27%
Record high74° (1978)
Record low18° (1991)
Fri, 0652° / 37°0.07
52 °
Glen Oak, Friday, 6 November
Climate normal for this date — 60-year average.
Average high52°
Average low37°
Average precipitation0.07 in
Chance of precipitation30%
Record high72° (1975)
Record low23° (1991)
Sat, 0751° / 37°0.05
51 °
Glen Oak, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high51°
Average low37°
Average precipitation0.05 in
Chance of precipitation17%
Record high68° (2020)
Record low16° (1991)
Sun, 0851° / 37°0.04
51 °
Glen Oak, Sunday, 8 November
Climate normal for this date — 60-year average.
Average high51°
Average low37°
Average precipitation0.04 in
Chance of precipitation18%
Record high73° (2020)
Record low13° (1991)
Mon, 0951° / 38°0.11
51 °
Glen Oak, Monday, 9 November
Climate normal for this date — 60-year average.
Average high51°
Average low38°
Average precipitation0.11 in
Chance of precipitation35%
Record high72° (1999)
Record low17° (1991)
Tue, 1050° / 37°0.1
50 °
Glen Oak, Tuesday, 10 November
Climate normal for this date — 60-year average.
Average high50°
Average low37°
Average precipitation0.1 in
Chance of precipitation32%
Record high72° (2020)
Record low17° (2017)
Wed, 1147° / 34°0.07
47 °
Glen Oak, Wednesday, 11 November
Climate normal for this date — 60-year average.
Average high47°
Average low34°
Average precipitation0.07 in
Chance of precipitation28%
Record high70° (1964)
Record low15° (2019)
Thu, 1246° / 33°0.06
46 °
Glen Oak, Thursday, 12 November
Climate normal for this date — 60-year average.
Average high46°
Average low33°
Average precipitation0.06 in
Chance of precipitation22%
Record high66° (1964)
Record low2° (2019)
Fri, 1346° / 33°0.04
46 °
Glen Oak, Friday, 13 November
Climate normal for this date — 60-year average.
Average high46°
Average low33°
Average precipitation0.04 in
Chance of precipitation17%
Record high69° (1999)
Record low3° (2019)
Sat, 1447° / 33°0.07
47 °
Glen Oak, Saturday, 14 November
Climate normal for this date — 60-year average.
Average high47°
Average low33°
Average precipitation0.07 in
Chance of precipitation30%
Record high69° (1971)
Record low13° (1986)
Sun, 1547° / 34°0.09
47 °
Glen Oak, Sunday, 15 November
Climate normal for this date — 60-year average.
Average high47°
Average low34°
Average precipitation0.09 in
Chance of precipitation28%
Record high69° (2025)
Record low19° (1982)
Mon, 1647° / 33°0.05
47 °
Glen Oak, Monday, 16 November
Climate normal for this date — 60-year average.
Average high47°
Average low33°
Average precipitation0.05 in
Chance of precipitation18%
Record high63° (1988)
Record low20° (1997)
Tue, 1747° / 34°0.08
47 °
Glen Oak, Tuesday, 17 November
Climate normal for this date — 60-year average.
Average high47°
Average low34°
Average precipitation0.08 in
Chance of precipitation30%
Record high70° (2016)
Record low15° (2014)
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 Glen Oak, 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 Glen Oak, 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.