Monthly outlook for Gilmer, IL: average high 62°, average low 47.8°. That is 1.5° above the climate normal for October. Precipitation is expected on 3 days (about 2.2 inches), against a normal of 5 days and 1.7 inches. The warmest day looks like 12 October (80.5°), the coolest 18 October (32.4°).
62°/47.8°
Average high / low
+1.5°
Above normal
3 / 5
Wet days / normal
2.2 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
9 October – 18 October
64.9°
60.3°
+2.6°
19 October – 28 October
57.1°
56.3°
+0.5°
29 October – 7 November
at normal
52.3°
—
October records over 66 years
86.9°3 October 2025All-time high
26.1°30 October 1988All-time low
Climate normals and records are computed from the nearest reference point — Round Lake Beach (10 mi).
Sat, 1076° / 60°0
76 °
Gilmer, Saturday, 10 October
Overcast. High 76°, low 60°.
Pressure30.06 inHg
Wind9.4 mph S
Humidity58%
Visibility6.2 mi
Dew point56°
Sun, 1173° / 56°0
73 °
Gilmer, Sunday, 11 October
Clear. High 73°, low 56°.
Pressure29.91 inHg
Wind1.9 mph SE
Humidity72%
Visibility6.2 mi
Dew point59°
Mon, 1281° / 62°0.02
81 °
Gilmer, Monday, 12 October
Light rain. High 81°, low 62°.
Pressure29.80 inHg
Wind11.3 mph SW
Humidity62%
Visibility6.2 mi
Dew point63°
Tue, 1370° / 59°0.03
70 °
Gilmer, Tuesday, 13 October
Light rain. High 70°, low 59°.
Pressure29.85 inHg
Wind7.2 mph N
Humidity85%
Visibility6.2 mi
Dew point62°
Wed, 1462° / 56°0
62 °
Gilmer, Wednesday, 14 October
Overcast. High 62°, low 56°.
Pressure30.09 inHg
Wind10.5 mph NE
Humidity69%
Visibility—
Dew point51°
Thu, 1563° / 53°0.37
63 °
Gilmer, Thursday, 15 October
Rain. High 63°, low 53°.
Pressure30.03 inHg
Wind9.7 mph S
Humidity43%
Visibility—
Dew point39°
Fri, 1664° / 41°1.18
64 °
Gilmer, Friday, 16 October
Heavy rain. High 64°, low 41°.
Pressure29.77 inHg
Wind22.2 mph W
Humidity53%
Visibility—
Dew point36°
Sat, 1745° / 35°0
45 °
Gilmer, Saturday, 17 October
Partly cloudy. High 45°, low 35°.
Pressure30.30 inHg
Wind20 mph W
Humidity43%
Visibility—
Dew point23°
Sun, 1848° / 32°0
48 °
Gilmer, Sunday, 18 October
Overcast. High 48°, low 32°.
Pressure30.33 inHg
Wind9.6 mph SW
Humidity41%
Visibility—
Dew point23°
Mon, 1958° / 39°0
58 °
Gilmer, Monday, 19 October
Overcast. High 58°, low 39°.
Pressure30.21 inHg
Wind11.3 mph SW
Humidity49%
Visibility—
Dew point35°
Tue, 2064° / 43°0
64 °
Gilmer, Tuesday, 20 October
Clear. High 64°, low 43°.
Pressure30.33 inHg
Wind5.6 mph S
Humidity42%
Visibility—
Dew point36°
Wed, 2164° / 51°0.01
64 °
Gilmer, Wednesday, 21 October
Light rain. High 64°, low 51°.
Pressure30.21 inHg
Wind12.2 mph SW
Humidity49%
Visibility—
Dew point42°
Thu, 2257° / 53°0.52
57 °
Gilmer, Thursday, 22 October
Rain. High 57°, low 53°.
Pressure29.97 inHg
Wind13.8 mph S
Humidity92%
Visibility—
Dew point52°
Fri, 2354° / 40°0.01
54 °
Gilmer, Friday, 23 October
Light rain. High 54°, low 40°.
Pressure29.94 inHg
Wind17 mph W
Humidity70%
Visibility—
Dew point35°
Sat, 2446° / 34°0
46 °
Gilmer, Saturday, 24 October
Partly cloudy. High 46°, low 34°.
Pressure30.18 inHg
Wind13.4 mph N
Humidity49%
Visibility—
Dew point25°
From day 17 onward the outlook is built from 60-year climate statistics
Sun, 2556° / 44°0.1
56 °
Gilmer, Sunday, 25 October
Climate normal for this date — 60-year average.
Average high56°
Average low44°
Average precipitation0.1 in
Chance of precipitation33%
Record high72° (2012)
Record low30° (1962)
Mon, 2655° / 44°0.13
55 °
Gilmer, Monday, 26 October
Climate normal for this date — 60-year average.
Average high55°
Average low44°
Average precipitation0.13 in
Chance of precipitation28%
Record high76° (1963)
Record low26° (1962)
Tue, 2755° / 43°0.08
55 °
Gilmer, Tuesday, 27 October
Climate normal for this date — 60-year average.
Average high55°
Average low43°
Average precipitation0.08 in
Chance of precipitation33%
Record high73° (2014)
Record low30° (1980)
Wed, 2854° / 43°0.05
54 °
Gilmer, Wednesday, 28 October
Climate normal for this date — 60-year average.
Average high54°
Average low43°
Average precipitation0.05 in
Chance of precipitation22%
Record high68° (1999)
Record low30° (1976)
Thu, 2954° / 42°0.06
54 °
Gilmer, Thursday, 29 October
Climate normal for this date — 60-year average.
Average high54°
Average low42°
Average precipitation0.06 in
Chance of precipitation20%
Record high78° (2024)
Record low28° (1988)
Fri, 3056° / 43°0.09
56 °
Gilmer, Friday, 30 October
Climate normal for this date — 60-year average.
Average high56°
Average low43°
Average precipitation0.09 in
Chance of precipitation30%
Record high76° (2024)
Record low26° (1988)
Sat, 3154° / 43°0.12
54 °
Gilmer, Saturday, 31 October
Climate normal for this date — 60-year average.
Average high54°
Average low43°
Average precipitation0.12 in
Chance of precipitation42%
Record high71° (1974)
Record low28° (2019)
Sun, 0153° / 42°0.16
53 °
Gilmer, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high53°
Average low42°
Average precipitation0.16 in
Chance of precipitation45%
Record high71° (2016)
Record low20° (2019)
Mon, 0252° / 41°0.14
52 °
Gilmer, Monday, 2 November
Climate normal for this date — 60-year average.
Average high52°
Average low41°
Average precipitation0.14 in
Chance of precipitation37%
Record high72° (1961)
Record low23° (1991)
Tue, 0351° / 40°0.06
51 °
Gilmer, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high51°
Average low40°
Average precipitation0.06 in
Chance of precipitation30%
Record high70° (1987)
Record low17° (1991)
Wed, 0451° / 41°0.1
51 °
Gilmer, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high51°
Average low41°
Average precipitation0.1 in
Chance of precipitation32%
Record high69° (2022)
Record low15° (1991)
Thu, 0551° / 40°0.12
51 °
Gilmer, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high51°
Average low40°
Average precipitation0.12 in
Chance of precipitation28%
Record high71° (1978)
Record low20° (1991)
Fri, 0651° / 38°0.09
51 °
Gilmer, Friday, 6 November
Climate normal for this date — 60-year average.
Average high51°
Average low38°
Average precipitation0.09 in
Chance of precipitation30%
Record high70° (2020)
Record low22° (1991)
Sat, 0750° / 38°0.05
50 °
Gilmer, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high50°
Average low38°
Average precipitation0.05 in
Chance of precipitation18%
Record high68° (2020)
Record low14° (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 Gilmer, 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 Gilmer, 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.