Monthly outlook for Chestervale, IL: average high 66.6°, average low 48.2°. That is 1.7° above the climate normal for October. Precipitation is expected on 2 days (about 0.2 inches), against a normal of 5 days and 1.8 inches. The warmest day looks like 13 October (87.9°), the coolest 18 October (30.4°).
66.6°/48.2°
Average high / low
+1.7°
Above normal
2 / 5
Wet days / normal
0.2 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
11 October – 20 October
67.4°
64.6°
+1.5°
21 October – 30 October
65.2°
61°
+2.3°
31 October – 9 November
at normal
56.5°
—
October records over 66 years
89.4°7 October 2007All-time high
21.9°22 October 1976All-time low
Climate normals and records are computed from the nearest reference point — Broadwell (7 mi).
Mon, 1287° / 60°0
87 °
Chestervale, Monday, 12 October
Overcast. High 87°, low 60°.
Pressure29.88 inHg
Wind11.1 mph SW
Humidity49%
Visibility6.2 mi
Dew point62°
Tue, 1388° / 71°0
88 °
Chestervale, Tuesday, 13 October
Clear. High 88°, low 71°.
Pressure29.88 inHg
Wind9.5 mph W
Humidity56%
Visibility6.2 mi
Dew point65°
Wed, 1477° / 67°0.02
77 °
Chestervale, Wednesday, 14 October
Light rain. High 77°, low 67°.
Pressure30.00 inHg
Wind7.1 mph N
Humidity68%
Visibility6.2 mi
Dew point64°
Thu, 1562° / 56°0.03
62 °
Chestervale, Thursday, 15 October
Light rain. High 62°, low 56°.
Pressure30.24 inHg
Wind11.3 mph NE
Humidity62%
Visibility—
Dew point47°
Fri, 1659° / 41°0.04
59 °
Chestervale, Friday, 16 October
Light rain. High 59°, low 41°.
Pressure30.33 inHg
Wind20.1 mph NW
Humidity42%
Visibility—
Dew point36°
Sat, 1744° / 33°0
44 °
Chestervale, Saturday, 17 October
Clear. High 44°, low 33°.
Pressure30.50 inHg
Wind19.9 mph NW
Humidity36%
Visibility—
Dew point16°
Sun, 1851° / 30°0
51 °
Chestervale, Sunday, 18 October
Overcast. High 51°, low 30°.
Pressure30.62 inHg
Wind9.3 mph S
Humidity30%
Visibility—
Dew point15°
Mon, 1960° / 37°0
60 °
Chestervale, Monday, 19 October
Partly cloudy. High 60°, low 37°.
Pressure30.47 inHg
Wind13.3 mph S
Humidity27%
Visibility—
Dew point21°
Tue, 2065° / 41°0
65 °
Chestervale, Tuesday, 20 October
Clear. High 65°, low 41°.
Pressure30.36 inHg
Wind11 mph S
Humidity23%
Visibility—
Dew point22°
Wed, 2170° / 45°0
70 °
Chestervale, Wednesday, 21 October
Overcast. High 70°, low 45°.
Pressure30.15 inHg
Wind17 mph SW
Humidity25%
Visibility—
Dew point28°
Thu, 2269° / 49°0
69 °
Chestervale, Thursday, 22 October
Clear. High 69°, low 49°.
Pressure30.15 inHg
Wind12.2 mph NW
Humidity37%
Visibility—
Dew point39°
Fri, 2364° / 46°0
64 °
Chestervale, Friday, 23 October
Mostly clear. High 64°, low 46°.
Pressure30.30 inHg
Wind6.6 mph NE
Humidity38%
Visibility—
Dew point34°
Sat, 2462° / 49°0
62 °
Chestervale, Saturday, 24 October
Partly cloudy. High 62°, low 49°.
Pressure30.33 inHg
Wind6.4 mph NE
Humidity36%
Visibility—
Dew point32°
Sun, 2553° / 47°0.03
53 °
Chestervale, Sunday, 25 October
Light rain. High 53°, low 47°.
Pressure30.27 inHg
Wind9.1 mph S
Humidity85%
Visibility—
Dew point47°
Mon, 2673° / 48°0.08
73 °
Chestervale, Monday, 26 October
Light rain. High 73°, low 48°.
Pressure30.09 inHg
Wind15.9 mph SW
Humidity35%
Visibility—
Dew point41°
From day 17 onward the outlook is built from 60-year climate statistics
Tue, 2760° / 44°0.09
60 °
Chestervale, Tuesday, 27 October
Climate normal for this date — 60-year average.
Average high60°
Average low44°
Average precipitation0.09 in
Chance of precipitation32%
Record high77° (1984)
Record low31° (2001)
Wed, 2859° / 43°0.06
59 °
Chestervale, Wednesday, 28 October
Climate normal for this date — 60-year average.
Average high59°
Average low43°
Average precipitation0.06 in
Chance of precipitation18%
Record high76° (1999)
Record low27° (1976)
Thu, 2959° / 43°0.08
59 °
Chestervale, Thursday, 29 October
Climate normal for this date — 60-year average.
Average high59°
Average low43°
Average precipitation0.08 in
Chance of precipitation27%
Record high79° (1971)
Record low25° (1980)
Fri, 3061° / 45°0.12
61 °
Chestervale, Friday, 30 October
Climate normal for this date — 60-year average.
Average high61°
Average low45°
Average precipitation0.12 in
Chance of precipitation30%
Record high80° (1971)
Record low25° (1980)
Sat, 3160° / 45°0.19
60 °
Chestervale, Saturday, 31 October
Climate normal for this date — 60-year average.
Average high60°
Average low45°
Average precipitation0.19 in
Chance of precipitation42%
Record high77° (1968)
Record low28° (2019)
Sun, 0159° / 43°0.2
59 °
Chestervale, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high59°
Average low43°
Average precipitation0.2 in
Chance of precipitation35%
Record high79° (2016)
Record low25° (1993)
Mon, 0257° / 42°0.08
57 °
Chestervale, Monday, 2 November
Climate normal for this date — 60-year average.
Average high57°
Average low42°
Average precipitation0.08 in
Chance of precipitation28%
Record high77° (1961)
Record low25° (1996)
Tue, 0356° / 41°0.11
56 °
Chestervale, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high56°
Average low41°
Average precipitation0.11 in
Chance of precipitation30%
Record high77° (1987)
Record low18° (1991)
Wed, 0456° / 42°0.1
56 °
Chestervale, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high56°
Average low42°
Average precipitation0.1 in
Chance of precipitation25%
Record high76° (1978)
Record low16° (1991)
Thu, 0556° / 41°0.15
56 °
Chestervale, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high56°
Average low41°
Average precipitation0.15 in
Chance of precipitation30%
Record high77° (1978)
Record low19° (1991)
Fri, 0655° / 39°0.08
55 °
Chestervale, Friday, 6 November
Climate normal for this date — 60-year average.
Average high55°
Average low39°
Average precipitation0.08 in
Chance of precipitation32%
Record high71° (2020)
Record low25° (1982)
Sat, 0755° / 39°0.07
55 °
Chestervale, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high55°
Average low39°
Average precipitation0.07 in
Chance of precipitation22%
Record high71° (1966)
Record low18° (1991)
Sun, 0855° / 39°0.04
55 °
Chestervale, Sunday, 8 November
Climate normal for this date — 60-year average.
Average high55°
Average low39°
Average precipitation0.04 in
Chance of precipitation15%
Record high76° (1999)
Record low11° (1991)
Mon, 0956° / 40°0.11
56 °
Chestervale, Monday, 9 November
Climate normal for this date — 60-year average.
Average high56°
Average low40°
Average precipitation0.11 in
Chance of precipitation33%
Record high74° (2020)
Record low15° (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 Chestervale, 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 Chestervale, 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.