Monthly outlook for Wheaton, IL: average high 62.3°, average low 47.9°. That is 0.6° above the climate normal for October. Precipitation is expected on 4 days (about 1.8 inches), against a normal of 5 days and 1.6 inches. The warmest day looks like 10 October (78.6°), the coolest 18 October (33.1°).
62.3°/47.9°
Average high / low
+0.6°
Above normal
4 / 5
Wet days / normal
1.8 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
7 October – 16 October
67.4°
62.7°
+2.6°
17 October – 26 October
53.8°
58.2°
-2.4°
27 October – 5 November
at normal
54.3°
—
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 (5 mi).
Thu, 0871° / 52°0
71 °
Wheaton, Thursday, 8 October
Clear. High 71°, low 52°.
Pressure30.12 inHg
Wind6.7 mph NW
Humidity47%
Visibility6.2 mi
Dew point44°
Fri, 0966° / 48°0.1
66 °
Wheaton, Friday, 9 October
Rain. High 66°, low 48°.
Pressure30.18 inHg
Wind7.6 mph SE
Humidity55%
Visibility3.9 mi
Dew point48°
Sat, 1079° / 59°0
79 °
Wheaton, Saturday, 10 October
Clear. High 79°, low 59°.
Pressure30.12 inHg
Wind8.1 mph S
Humidity56%
Visibility6.2 mi
Dew point57°
Sun, 1165° / 57°0.15
65 °
Wheaton, Sunday, 11 October
Light rain. High 65°, low 57°.
Pressure29.88 inHg
Wind8.1 mph S
Humidity78%
Visibility—
Dew point56°
Mon, 1276° / 54°0
76 °
Wheaton, Monday, 12 October
Light rain. High 76°, low 54°.
Pressure29.77 inHg
Wind10.5 mph N
Humidity66%
Visibility—
Dew point60°
Tue, 1357° / 50°0.06
57 °
Wheaton, Tuesday, 13 October
Light rain. High 57°, low 50°.
Pressure30.03 inHg
Wind11.1 mph N
Humidity76%
Visibility—
Dew point46°
Wed, 1456° / 45°0
56 °
Wheaton, Wednesday, 14 October
Overcast. High 56°, low 45°.
Pressure30.15 inHg
Wind15.3 mph S
Humidity51%
Visibility—
Dew point36°
Thu, 1575° / 54°1.43
75 °
Wheaton, Thursday, 15 October
Heavy rain. High 75°, low 54°.
Pressure29.74 inHg
Wind16.4 mph SE
Humidity69%
Visibility—
Dew point58°
Fri, 1652° / 44°0
52 °
Wheaton, Friday, 16 October
Clear. High 52°, low 44°.
Pressure30.09 inHg
Wind14 mph NW
Humidity55%
Visibility—
Dew point35°
Sat, 1745° / 40°0
45 °
Wheaton, Saturday, 17 October
Overcast. High 45°, low 40°.
Pressure30.21 inHg
Wind13.4 mph NW
Humidity69%
Visibility—
Dew point33°
Sun, 1849° / 33°0
49 °
Wheaton, Sunday, 18 October
Partly cloudy. High 49°, low 33°.
Pressure30.24 inHg
Wind10.6 mph W
Humidity41%
Visibility—
Dew point23°
Mon, 1956° / 39°0
56 °
Wheaton, Monday, 19 October
Overcast. High 56°, low 39°.
Pressure30.27 inHg
Wind9 mph SW
Humidity46%
Visibility—
Dew point32°
Tue, 2060° / 45°0
60 °
Wheaton, Tuesday, 20 October
Mostly clear. High 60°, low 45°.
Pressure30.47 inHg
Wind7.3 mph E
Humidity47%
Visibility—
Dew point37°
Wed, 2157° / 45°0.03
57 °
Wheaton, Wednesday, 21 October
Light rain. High 57°, low 45°.
Pressure30.30 inHg
Wind8.3 mph SW
Humidity51%
Visibility—
Dew point38°
Thu, 2255° / 46°0.01
55 °
Wheaton, Thursday, 22 October
Light rain. High 55°, low 46°.
Pressure30.06 inHg
Wind10.3 mph NW
Humidity42%
Visibility—
Dew point31°
From day 17 onward the outlook is built from 60-year climate statistics
Fri, 2359° / 44°0.11
59 °
Wheaton, Friday, 23 October
Climate normal for this date — 60-year average.
Average high59°
Average low44°
Average precipitation0.11 in
Chance of precipitation33%
Record high78° (1963)
Record low29° (1969)
Sat, 2457° / 44°0.11
57 °
Wheaton, 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° / 43°0.09
57 °
Wheaton, Sunday, 25 October
Climate normal for this date — 60-year average.
Average high57°
Average low43°
Average precipitation0.09 in
Chance of precipitation28%
Record high74° (2012)
Record low29° (2013)
Mon, 2656° / 43°0.1
56 °
Wheaton, Monday, 26 October
Climate normal for this date — 60-year average.
Average high56°
Average low43°
Average precipitation0.1 in
Chance of precipitation28%
Record high78° (1963)
Record low24° (1962)
Tue, 2756° / 42°0.09
56 °
Wheaton, Tuesday, 27 October
Climate normal for this date — 60-year average.
Average high56°
Average low42°
Average precipitation0.09 in
Chance of precipitation33%
Record high75° (2014)
Record low28° (1980)
Wed, 2855° / 42°0.04
55 °
Wheaton, Wednesday, 28 October
Climate normal for this date — 60-year average.
Average high55°
Average low42°
Average precipitation0.04 in
Chance of precipitation20%
Record high74° (1999)
Record low25° (1976)
Thu, 2955° / 41°0.06
55 °
Wheaton, Thursday, 29 October
Climate normal for this date — 60-year average.
Average high55°
Average low41°
Average precipitation0.06 in
Chance of precipitation22%
Record high78° (2024)
Record low26° (1980)
Fri, 3057° / 42°0.11
57 °
Wheaton, Friday, 30 October
Climate normal for this date — 60-year average.
Average high57°
Average low42°
Average precipitation0.11 in
Chance of precipitation30%
Record high76° (1971)
Record low24° (1988)
Sat, 3155° / 43°0.13
55 °
Wheaton, Saturday, 31 October
Climate normal for this date — 60-year average.
Average high55°
Average low43°
Average precipitation0.13 in
Chance of precipitation38%
Record high74° (1974)
Record low27° (1988)
Sun, 0155° / 41°0.16
55 °
Wheaton, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high55°
Average low41°
Average precipitation0.16 in
Chance of precipitation38%
Record high73° (2016)
Record low20° (2019)
Mon, 0253° / 40°0.11
53 °
Wheaton, Monday, 2 November
Climate normal for this date — 60-year average.
Average high53°
Average low40°
Average precipitation0.11 in
Chance of precipitation38%
Record high74° (1961)
Record low23° (1991)
Tue, 0352° / 39°0.06
52 °
Wheaton, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high52°
Average low39°
Average precipitation0.06 in
Chance of precipitation27%
Record high72° (1987)
Record low17° (1991)
Wed, 0452° / 41°0.09
52 °
Wheaton, 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 °
Wheaton, 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)
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 Wheaton, 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 Wheaton, 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.