As of 09:34 CDT

Weather in Cortland, IL

48°

Cortland, Friday, 30 October, 09:34

Overcast. Feels like 46°. High 57°, low 43°.

Pressure30.36 inHg

Wind4.6 mph NE

Humidity83%

Visibility6.2 mi

Dew point43°

See detailed hourly forecast

Monthly outlook for Cortland, IL: average high 54.4°, average low 45.6°. That is 1.9° above the climate normal for October. Precipitation is expected on 8 days (about 1.9 inches), against a normal of 4 days and 1.4 inches. The warmest day looks like 3 November (66.6°), the coolest 11 November (34°).

54.4°/45.6°

Average high / low

+1.9°

Above normal

8 / 4

Wet days / normal

1.9 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
30 October – 8 November	58.2°	52.9°	+2.9°
9 November – 18 November	48°	47.2°	+0.4°
19 November – 28 November	at normal	43°	—

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 (5 mi).

Sat, 3166° / 50°

0.37

66 °

Cortland, Saturday, 31 October

Rain. High 66°, low 50°.

Pressure30.33 inHg

Wind8.6 mph SE

Humidity62%

Visibility6.2 mi

Dew point46°

Sun, 0163° / 55°

63 °

Cortland, Sunday, 1 November

Overcast. High 63°, low 55°.

Pressure30.33 inHg

Wind5.3 mph SE

Humidity75%

Visibility6.2 mi

Dew point53°

Mon, 0263° / 52°

0.01

63 °

Cortland, Monday, 2 November

Light rain. High 63°, low 52°.

Pressure30.09 inHg

Wind9.8 mph S

Humidity78%

Visibility6.2 mi

Dew point53°

Tue, 0367° / 63°

0.22

67 °

Cortland, Tuesday, 3 November

Light rain. High 67°, low 63°.

Pressure29.85 inHg

Wind16.4 mph S

Humidity87%

Visibility—

Dew point61°

Wed, 0464° / 58°

0.65

64 °

Cortland, Wednesday, 4 November

Rain. High 64°, low 58°.

Pressure29.65 inHg

Wind10.4 mph S

Humidity91%

Visibility—

Dew point61°

Thu, 0556° / 50°

0.06

56 °

Cortland, Thursday, 5 November

Light rain. High 56°, low 50°.

Pressure29.74 inHg

Wind13.4 mph N

Humidity80%

Visibility—

Dew point48°

Fri, 0651° / 46°

51 °

Cortland, Friday, 6 November

Overcast. High 51°, low 46°.

Pressure29.94 inHg

Wind11.9 mph N

Humidity71%

Visibility—

Dew point41°

Sat, 0750° / 38°

50 °

Cortland, Saturday, 7 November

Clear. High 50°, low 38°.

Pressure30.15 inHg

Wind11.1 mph NE

Humidity57%

Visibility—

Dew point33°

Sun, 0847° / 37°

47 °

Cortland, Sunday, 8 November

Overcast. High 47°, low 37°.

Pressure30.36 inHg

Wind10.3 mph E

Humidity54%

Visibility—

Dew point30°

Mon, 0948° / 42°

0.01

48 °

Cortland, Monday, 9 November

Light rain. High 48°, low 42°.

Pressure30.15 inHg

Wind10.7 mph NE

Humidity50%

Visibility—

Dew point29°

Tue, 1044° / 40°

0.15

44 °

Cortland, Tuesday, 10 November

Light rain. High 44°, low 40°.

Pressure29.94 inHg

Wind15.7 mph NE

Humidity78%

Visibility—

Dew point37°

Wed, 1148° / 34°

48 °

Cortland, Wednesday, 11 November

Clear. High 48°, low 34°.

Pressure30.00 inHg

Wind10.8 mph N

Humidity59%

Visibility—

Dew point32°

Thu, 1249° / 35°

49 °

Cortland, Thursday, 12 November

Clear. High 49°, low 35°.

Pressure29.91 inHg

Wind8.4 mph S

Humidity56%

Visibility—

Dew point31°

Fri, 1346° / 40°

0.23

46 °

Cortland, Friday, 13 November

Light rain. High 46°, low 40°.

Pressure29.71 inHg

Wind16.9 mph SE

Humidity84%

Visibility—

Dew point37°

Sat, 1452° / 46°

0.12

52 °

Cortland, Saturday, 14 November

Light rain. High 52°, low 46°.

Pressure29.56 inHg

Wind11.7 mph SE

Humidity68%

Visibility—

Dew point41°

From day 17 onward the outlook is built from 60-year climate statistics

Sun, 1546° / 33°

0.08

46 °

Cortland, 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 °

Cortland, 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 °

Cortland, 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 °

Cortland, 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 °

Cortland, 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 °

Cortland, 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 °

Cortland, 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 °

Cortland, 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)

Mon, 2344° / 31°

0.07

44 °

Cortland, Monday, 23 November

Climate normal for this date — 60-year average.

Average high44°

Average low31°

Average precipitation0.07 in

Chance of precipitation28%

Record high64° (2003)

Record low11° (1970)

Tue, 2442° / 29°

0.08

42 °

Cortland, Tuesday, 24 November

Climate normal for this date — 60-year average.

Average high42°

Average low29°

Average precipitation0.08 in

Chance of precipitation30%

Record high65° (1966)

Record low12° (1970)

Wed, 2542° / 30°

0.08

42 °

Cortland, Wednesday, 25 November

Climate normal for this date — 60-year average.

Average high42°

Average low30°

Average precipitation0.08 in

Chance of precipitation32%

Record high60° (1966)

Record low11° (1977)

Thu, 2643° / 29°

0.11

43 °

Cortland, Thursday, 26 November

Climate normal for this date — 60-year average.

Average high43°

Average low29°

Average precipitation0.11 in

Chance of precipitation40%

Record high64° (1990)

Record low0° (1977)

Fri, 2741° / 29°

0.19

41 °

Cortland, Friday, 27 November

Climate normal for this date — 60-year average.

Average high41°

Average low29°

Average precipitation0.19 in

Chance of precipitation48%

Record high65° (1990)

Record low9° (1977)

Sat, 2839° / 27°

0.12

39 °

Cortland, Saturday, 28 November

Climate normal for this date — 60-year average.

Average high39°

Average low27°

Average precipitation0.12 in

Chance of precipitation30%

Record high64° (1998)

Record low4° (2018)

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 Cortland, 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 Cortland, 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.