Monthly outlook for Riley, IL: average high 63.2°, average low 47.6°. That is 5.1° above the climate normal for October. Precipitation is expected on 2 days (about 0.3 inches), against a normal of 4 days and 1.4 inches. The warmest day looks like 29 October (71.8°), the coolest 2 November (39.6°).
63.2°/47.6°
Average high / low
+5.1°
Above normal
2 / 4
Wet days / normal
0.3 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
24 October – 2 November
66.2°
55.5°
+5.9°
3 November – 12 November
58.1°
50.2°
+4.4°
13 November – 22 November
at normal
45.9°
—
October records over 66 years
87.1°3 October 2025All-time high
22.1°24 October 1981All-time low
Climate normals and records are computed from the nearest reference point — Sycamore (14 mi).
Sun, 2572° / 48°0
72 °
Riley, Sunday, 25 October
Partly cloudy. High 72°, low 48°.
Pressure30.39 inHg
Wind6.2 mph S
Humidity54%
Visibility6.2 mi
Dew point51°
Mon, 2666° / 49°0
66 °
Riley, Monday, 26 October
Overcast. High 66°, low 49°.
Pressure30.36 inHg
Wind7.2 mph E
Humidity69%
Visibility6.2 mi
Dew point54°
Tue, 2765° / 49°0
65 °
Riley, Tuesday, 27 October
Overcast. High 65°, low 49°.
Pressure30.27 inHg
Wind8.2 mph SE
Humidity70%
Visibility6.2 mi
Dew point52°
Wed, 2869° / 53°0.01
69 °
Riley, Wednesday, 28 October
Light rain. High 69°, low 53°.
Pressure30.15 inHg
Wind11.5 mph SW
Humidity57%
Visibility—
Dew point49°
Thu, 2972° / 55°0.02
72 °
Riley, Thursday, 29 October
Light rain. High 72°, low 55°.
Pressure30.18 inHg
Wind10.3 mph SW
Humidity54%
Visibility—
Dew point52°
Fri, 3067° / 59°0.08
67 °
Riley, Friday, 30 October
Light rain. High 67°, low 59°.
Pressure30.12 inHg
Wind7.8 mph S
Humidity74%
Visibility—
Dew point57°
Sat, 3169° / 56°0.2
69 °
Riley, Saturday, 31 October
Light rain. High 69°, low 56°.
Pressure30.06 inHg
Wind17.9 mph SE
Humidity49%
Visibility—
Dew point47°
Sun, 0160° / 47°0.03
60 °
Riley, Sunday, 1 November
Light rain. High 60°, low 47°.
Pressure29.91 inHg
Wind19.6 mph S
Humidity70%
Visibility—
Dew point48°
Mon, 0254° / 40°0
54 °
Riley, Monday, 2 November
Clear. High 54°, low 40°.
Pressure30.09 inHg
Wind13.5 mph W
Humidity42%
Visibility—
Dew point28°
Tue, 0347° / 42°0
47 °
Riley, Tuesday, 3 November
Partly cloudy. High 47°, low 42°.
Pressure30.06 inHg
Wind16.2 mph NW
Humidity41%
Visibility—
Dew point24°
Wed, 0450° / 40°0
50 °
Riley, Wednesday, 4 November
Overcast. High 50°, low 40°.
Pressure30.06 inHg
Wind10.2 mph S
Humidity38%
Visibility—
Dew point24°
Thu, 0562° / 40°0
62 °
Riley, Thursday, 5 November
Overcast. High 62°, low 40°.
Pressure30.00 inHg
Wind7.9 mph W
Humidity41%
Visibility—
Dew point34°
Fri, 0670° / 48°0
70 °
Riley, Friday, 6 November
Partly cloudy. High 70°, low 48°.
Pressure29.97 inHg
Wind15.4 mph SW
Humidity58%
Visibility—
Dew point51°
Sat, 0761° / 48°0
61 °
Riley, Saturday, 7 November
Overcast. High 61°, low 48°.
Pressure30.06 inHg
Wind14.3 mph NW
Humidity42%
Visibility—
Dew point36°
Sun, 0859° / 42°0
59 °
Riley, Sunday, 8 November
Overcast. High 59°, low 42°.
Pressure30.15 inHg
Wind7.1 mph NW
Humidity36%
Visibility—
Dew point29°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 0951° / 37°0.12
51 °
Riley, Monday, 9 November
Climate normal for this date — 60-year average.
Average high51°
Average low37°
Average precipitation0.12 in
Chance of precipitation33%
Record high73° (1999)
Record low17° (1991)
Tue, 1049° / 35°0.1
49 °
Riley, Tuesday, 10 November
Climate normal for this date — 60-year average.
Average high49°
Average low35°
Average precipitation0.1 in
Chance of precipitation33%
Record high72° (2022)
Record low15° (2017)
Wed, 1147° / 33°0.07
47 °
Riley, Wednesday, 11 November
Climate normal for this date — 60-year average.
Average high47°
Average low33°
Average precipitation0.07 in
Chance of precipitation25%
Record high70° (1964)
Record low13° (2019)
Thu, 1246° / 32°0.06
46 °
Riley, Thursday, 12 November
Climate normal for this date — 60-year average.
Average high46°
Average low32°
Average precipitation0.06 in
Chance of precipitation23%
Record high65° (1964)
Record low1° (2019)
Fri, 1346° / 32°0.04
46 °
Riley, Friday, 13 November
Climate normal for this date — 60-year average.
Average high46°
Average low32°
Average precipitation0.04 in
Chance of precipitation20%
Record high70° (1999)
Record low1° (2019)
Sat, 1447° / 32°0.07
47 °
Riley, Saturday, 14 November
Climate normal for this date — 60-year average.
Average high47°
Average low32°
Average precipitation0.07 in
Chance of precipitation30%
Record high69° (1971)
Record low13° (1986)
Sun, 1546° / 33°0.08
46 °
Riley, Sunday, 15 November
Climate normal for this date — 60-year average.
Average high46°
Average low33°
Average precipitation0.08 in
Chance of precipitation23%
Record high69° (2025)
Record low14° (2019)
Mon, 1647° / 33°0.05
47 °
Riley, Monday, 16 November
Climate normal for this date — 60-year average.
Average high47°
Average low33°
Average precipitation0.05 in
Chance of precipitation15%
Record high63° (1988)
Record low18° (1997)
Tue, 1747° / 33°0.1
47 °
Riley, Tuesday, 17 November
Climate normal for this date — 60-year average.
Average high47°
Average low33°
Average precipitation0.1 in
Chance of precipitation28%
Record high71° (2016)
Record low14° (2014)
Wed, 1847° / 34°0.1
47 °
Riley, Wednesday, 18 November
Climate normal for this date — 60-year average.
Average high47°
Average low34°
Average precipitation0.1 in
Chance of precipitation25%
Record high68° (1999)
Record low11° (2014)
Thu, 1946° / 33°0.07
46 °
Riley, Thursday, 19 November
Climate normal for this date — 60-year average.
Average high46°
Average low33°
Average precipitation0.07 in
Chance of precipitation28%
Record high64° (1983)
Record low11° (2018)
Fri, 2045° / 32°0.08
45 °
Riley, Friday, 20 November
Climate normal for this date — 60-year average.
Average high45°
Average low32°
Average precipitation0.08 in
Chance of precipitation35%
Record high63° (2003)
Record low13° (2022)
Sat, 2144° / 30°0.1
44 °
Riley, Saturday, 21 November
Climate normal for this date — 60-year average.
Average high44°
Average low30°
Average precipitation0.1 in
Chance of precipitation23%
Record high66° (1990)
Record low8° (1964)
Sun, 2244° / 29°0.03
44 °
Riley, Sunday, 22 November
Climate normal for this date — 60-year average.
Average high44°
Average low29°
Average precipitation0.03 in
Chance of precipitation22%
Record high67° (2010)
Record low1° (2015)
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 Riley, 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 Riley, 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.