Monthly outlook for Custer, IL: average high 71.3°, average low 53.4°. That is 4.4° above the climate normal for October. Precipitation is expected on 4 days (about 1.4 inches), against a normal of 5 days and 1.5 inches. The warmest day looks like 15 October (88.7°), the coolest 18 October (41.8°).
71.3°/53.4°
Average high / low
+4.4°
Above normal
4 / 5
Wet days / normal
1.4 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
8 October – 17 October
75.1°
64.8°
+5.7°
18 October – 27 October
65.1°
60°
+2.9°
28 October – 6 November
at normal
56.1°
—
October records over 66 years
89.2°7 October 2007All-time high
21.9°22 October 1976All-time low
Climate normals and records are computed from the nearest reference point — Toluca (2 mi).
Fri, 0977° / 51°0.01
77 °
Custer, Friday, 9 October
Light rain. High 77°, low 51°.
Pressure30.09 inHg
Wind6.8 mph SE
Humidity52%
Visibility6.2 mi
Dew point53°
Sat, 1080° / 60°0
80 °
Custer, Saturday, 10 October
Overcast. High 80°, low 60°.
Pressure30.09 inHg
Wind6.8 mph S
Humidity55%
Visibility6.2 mi
Dew point57°
Sun, 1174° / 57°0
74 °
Custer, Sunday, 11 October
Clear. High 74°, low 57°.
Pressure29.94 inHg
Wind3 mph NE
Humidity64%
Visibility6.2 mi
Dew point58°
Mon, 1283° / 59°0
83 °
Custer, Monday, 12 October
Overcast. High 83°, low 59°.
Pressure29.83 inHg
Wind10.6 mph SW
Humidity51%
Visibility—
Dew point59°
Tue, 1380° / 64°0.02
80 °
Custer, Tuesday, 13 October
Light rain. High 80°, low 64°.
Pressure29.85 inHg
Wind9.3 mph NE
Humidity65%
Visibility—
Dew point66°
Wed, 1465° / 54°0.08
65 °
Custer, Wednesday, 14 October
Light rain. High 65°, low 54°.
Pressure30.00 inHg
Wind13.8 mph E
Humidity74%
Visibility—
Dew point47°
Thu, 1589° / 72°0.83
89 °
Custer, Thursday, 15 October
Heavy rain. High 89°, low 72°.
Pressure29.83 inHg
Wind19.9 mph SW
Humidity46%
Visibility—
Dew point63°
Fri, 1671° / 52°0.2
71 °
Custer, Friday, 16 October
Rain. High 71°, low 52°.
Pressure30.24 inHg
Wind14 mph NW
Humidity62%
Visibility—
Dew point47°
Sat, 1757° / 43°0
57 °
Custer, Saturday, 17 October
Partly cloudy. High 57°, low 43°.
Pressure30.62 inHg
Wind13.8 mph NE
Humidity53%
Visibility—
Dew point37°
Sun, 1857° / 42°0
57 °
Custer, Sunday, 18 October
Overcast. High 57°, low 42°.
Pressure30.47 inHg
Wind8.4 mph SE
Humidity40%
Visibility—
Dew point30°
Mon, 1972° / 49°0.01
72 °
Custer, Monday, 19 October
Light rain. High 72°, low 49°.
Pressure30.18 inHg
Wind14.5 mph S
Humidity59%
Visibility—
Dew point49°
Tue, 2074° / 57°0.01
74 °
Custer, Tuesday, 20 October
Light rain. High 74°, low 57°.
Pressure30.12 inHg
Wind12.3 mph SW
Humidity53%
Visibility—
Dew point52°
Wed, 2169° / 53°0
69 °
Custer, Wednesday, 21 October
Clear. High 69°, low 53°.
Pressure30.09 inHg
Wind8.9 mph W
Humidity35%
Visibility—
Dew point38°
Thu, 2260° / 50°0.19
60 °
Custer, Thursday, 22 October
Light rain. High 60°, low 50°.
Pressure29.91 inHg
Wind18.8 mph W
Humidity82%
Visibility—
Dew point50°
Fri, 2358° / 42°0
58 °
Custer, Friday, 23 October
Clear. High 58°, low 42°.
Pressure30.18 inHg
Wind15.1 mph W
Humidity45%
Visibility—
Dew point33°
From day 17 onward the outlook is built from 60-year climate statistics
Sat, 2459° / 45°0.12
59 °
Custer, Saturday, 24 October
Climate normal for this date — 60-year average.
Average high59°
Average low45°
Average precipitation0.12 in
Chance of precipitation35%
Record high80° (1963)
Record low23° (1981)
Sun, 2559° / 43°0.1
59 °
Custer, Sunday, 25 October
Climate normal for this date — 60-year average.
Average high59°
Average low43°
Average precipitation0.1 in
Chance of precipitation28%
Record high76° (2012)
Record low28° (2013)
Mon, 2658° / 43°0.11
58 °
Custer, Monday, 26 October
Climate normal for this date — 60-year average.
Average high58°
Average low43°
Average precipitation0.11 in
Chance of precipitation28%
Record high80° (1963)
Record low23° (1962)
Tue, 2758° / 43°0.08
58 °
Custer, Tuesday, 27 October
Climate normal for this date — 60-year average.
Average high58°
Average low43°
Average precipitation0.08 in
Chance of precipitation28%
Record high76° (2014)
Record low29° (1997)
Wed, 2857° / 42°0.04
57 °
Custer, Wednesday, 28 October
Climate normal for this date — 60-year average.
Average high57°
Average low42°
Average precipitation0.04 in
Chance of precipitation22%
Record high75° (1999)
Record low25° (1976)
Thu, 2958° / 42°0.08
58 °
Custer, Thursday, 29 October
Climate normal for this date — 60-year average.
Average high58°
Average low42°
Average precipitation0.08 in
Chance of precipitation25%
Record high79° (2024)
Record low23° (1980)
Fri, 3059° / 43°0.11
59 °
Custer, Friday, 30 October
Climate normal for this date — 60-year average.
Average high59°
Average low43°
Average precipitation0.11 in
Chance of precipitation27%
Record high80° (1971)
Record low24° (1988)
Sat, 3158° / 43°0.15
58 °
Custer, Saturday, 31 October
Climate normal for this date — 60-year average.
Average high58°
Average low43°
Average precipitation0.15 in
Chance of precipitation42%
Record high75° (1974)
Record low24° (2019)
Sun, 0157° / 42°0.18
57 °
Custer, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high57°
Average low42°
Average precipitation0.18 in
Chance of precipitation33%
Record high77° (2016)
Record low22° (2019)
Mon, 0256° / 41°0.09
56 °
Custer, Monday, 2 November
Climate normal for this date — 60-year average.
Average high56°
Average low41°
Average precipitation0.09 in
Chance of precipitation33%
Record high76° (1961)
Record low24° (1991)
Tue, 0355° / 39°0.08
55 °
Custer, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high55°
Average low39°
Average precipitation0.08 in
Chance of precipitation27%
Record high75° (1964)
Record low17° (1991)
Wed, 0454° / 41°0.08
54 °
Custer, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high54°
Average low41°
Average precipitation0.08 in
Chance of precipitation22%
Record high75° (1978)
Record low17° (1991)
Thu, 0554° / 39°0.11
54 °
Custer, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high54°
Average low39°
Average precipitation0.11 in
Chance of precipitation22%
Record high76° (1978)
Record low19° (1991)
Fri, 0654° / 38°0.08
54 °
Custer, Friday, 6 November
Climate normal for this date — 60-year average.
Average high54°
Average low38°
Average precipitation0.08 in
Chance of precipitation30%
Record high71° (2020)
Record low24° (1973)
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 Custer, 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 Custer, 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.