As of 07:33 CDT

Weather in Harlem, IL

54°

Harlem, Friday, 9 October, 07:33

Overcast. Feels like 53°. High 71°, low 52°.

Pressure30.12 inHg

Wind4.6 mph SE

Humidity78%

Visibility6.2 mi

Dew point48°

See detailed hourly forecast

Monthly outlook for Harlem, IL: average high 66.2°, average low 49°. That is 3.5° above the climate normal for October. Precipitation is expected on 4 days (about 2.7 inches), against a normal of 5 days and 1.6 inches. The warmest day looks like 12 October (81.9°), the coolest 18 October (35.1°).

66.2°/49°

Average high / low

+3.5°

Above normal

4 / 5

Wet days / normal

2.7 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
9 October – 18 October	67.1°	61°	+3.4°
19 October – 28 October	64.5°	57°	+4.2°
29 October – 7 November	at normal	52.8°	—

October records over 66 years

88°3 October 2025All-time high

22.1°30 October 1988All-time low

Climate normals and records are computed from the nearest reference point — Rockford (6 mi).

Sat, 1079° / 57°

79 °

Harlem, Saturday, 10 October

Overcast. High 79°, low 57°.

Pressure30.06 inHg

Wind9.5 mph S

Humidity56%

Visibility6.2 mi

Dew point57°

Sun, 1174° / 56°

74 °

Harlem, Sunday, 11 October

Clear. High 74°, low 56°.

Pressure29.91 inHg

Wind4.6 mph SE

Humidity64%

Visibility6.2 mi

Dew point57°

Mon, 1282° / 60°

0.04

82 °

Harlem, Monday, 12 October

Light rain. High 82°, low 60°.

Pressure29.77 inHg

Wind11 mph SW

Humidity58%

Visibility6.2 mi

Dew point63°

Tue, 1373° / 62°

0.15

73 °

Harlem, Tuesday, 13 October

Rain. High 73°, low 62°.

Pressure29.83 inHg

Wind8.5 mph NE

Humidity79%

Visibility—

Dew point65°

Wed, 1465° / 57°

1.96

65 °

Harlem, Wednesday, 14 October

Heavy rain. High 65°, low 57°.

Pressure29.88 inHg

Wind11.4 mph E

Humidity84%

Visibility—

Dew point59°

Thu, 1571° / 57°

0.5

71 °

Harlem, Thursday, 15 October

Rain. High 71°, low 57°.

Pressure29.74 inHg

Wind20.5 mph SW

Humidity98%

Visibility—

Dew point58°

Fri, 1657° / 42°

57 °

Harlem, Friday, 16 October

Overcast. High 57°, low 42°.

Pressure29.91 inHg

Wind26.3 mph W

Humidity49%

Visibility—

Dew point32°

Sat, 1747° / 41°

47 °

Harlem, Saturday, 17 October

Overcast. High 47°, low 41°.

Pressure30.30 inHg

Wind18.7 mph NW

Humidity59%

Visibility—

Dew point31°

Sun, 1853° / 35°

53 °

Harlem, Sunday, 18 October

Overcast. High 53°, low 35°.

Pressure30.33 inHg

Wind10.1 mph SW

Humidity48%

Visibility—

Dew point30°

Mon, 1960° / 40°

60 °

Harlem, Monday, 19 October

Overcast. High 60°, low 40°.

Pressure30.36 inHg

Wind6.7 mph SW

Humidity44%

Visibility—

Dew point34°

Tue, 2063° / 43°

63 °

Harlem, Tuesday, 20 October

Clear. High 63°, low 43°.

Pressure30.39 inHg

Wind8.7 mph SE

Humidity44%

Visibility—

Dew point37°

Wed, 2166° / 45°

66 °

Harlem, Wednesday, 21 October

Clear. High 66°, low 45°.

Pressure30.30 inHg

Wind6.9 mph SE

Humidity42%

Visibility—

Dew point38°

Thu, 2267° / 46°

67 °

Harlem, Thursday, 22 October

Clear. High 67°, low 46°.

Pressure30.27 inHg

Wind5.6 mph E

Humidity41%

Visibility—

Dew point38°

Fri, 2366° / 45°

66 °

Harlem, Friday, 23 October

Clear. High 66°, low 45°.

Pressure30.21 inHg

Wind8 mph E

Humidity43%

Visibility—

Dew point39°

Sat, 2466° / 46°

66 °

Harlem, Saturday, 24 October

Clear. High 66°, low 46°.

Pressure30.12 inHg

Wind7.5 mph E

Humidity51%

Visibility—

Dew point44°

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

Sun, 2556° / 42°

0.09

56 °

Harlem, Sunday, 25 October

Climate normal for this date — 60-year average.

Average high56°

Average low42°

Average precipitation0.09 in

Chance of precipitation28%

Record high76° (1989)

Record low27° (2006)

Mon, 2655° / 42°

0.11

55 °

Harlem, Monday, 26 October

Climate normal for this date — 60-year average.

Average high55°

Average low42°

Average precipitation0.11 in

Chance of precipitation28%

Record high77° (1963)

Record low24° (1962)

Tue, 2755° / 41°

0.07

55 °

Harlem, Tuesday, 27 October

Climate normal for this date — 60-year average.

Average high55°

Average low41°

Average precipitation0.07 in

Chance of precipitation22%

Record high74° (2014)

Record low26° (1997)

Wed, 2855° / 41°

0.04

55 °

Harlem, Wednesday, 28 October

Climate normal for this date — 60-year average.

Average high55°

Average low41°

Average precipitation0.04 in

Chance of precipitation20%

Record high71° (1999)

Record low25° (1976)

Thu, 2955° / 40°

0.06

55 °

Harlem, Thursday, 29 October

Climate normal for this date — 60-year average.

Average high55°

Average low40°

Average precipitation0.06 in

Chance of precipitation22%

Record high78° (2024)

Record low23° (1980)

Fri, 3056° / 41°

0.09

56 °

Harlem, Friday, 30 October

Climate normal for this date — 60-year average.

Average high56°

Average low41°

Average precipitation0.09 in

Chance of precipitation28%

Record high76° (2024)

Record low22° (1988)

Sat, 3155° / 42°

0.1

55 °

Harlem, Saturday, 31 October

Climate normal for this date — 60-year average.

Average high55°

Average low42°

Average precipitation0.1 in

Chance of precipitation43%

Record high72° (1974)

Record low27° (1988)

Sun, 0154° / 40°

0.16

54 °

Harlem, Sunday, 1 November

Climate normal for this date — 60-year average.

Average high54°

Average low40°

Average precipitation0.16 in

Chance of precipitation35%

Record high73° (2000)

Record low18° (2019)

Mon, 0253° / 39°

0.1

53 °

Harlem, Monday, 2 November

Climate normal for this date — 60-year average.

Average high53°

Average low39°

Average precipitation0.1 in

Chance of precipitation35%

Record high73° (1961)

Record low21° (1991)

Tue, 0352° / 38°

0.06

52 °

Harlem, Tuesday, 3 November

Climate normal for this date — 60-year average.

Average high52°

Average low38°

Average precipitation0.06 in

Chance of precipitation28%

Record high71° (1964)

Record low15° (1991)

Wed, 0452° / 39°

0.09

52 °

Harlem, Wednesday, 4 November

Climate normal for this date — 60-year average.

Average high52°

Average low39°

Average precipitation0.09 in

Chance of precipitation25%

Record high70° (2015)

Record low13° (1991)

Thu, 0551° / 38°

0.11

51 °

Harlem, Thursday, 5 November

Climate normal for this date — 60-year average.

Average high51°

Average low38°

Average precipitation0.11 in

Chance of precipitation25%

Record high70° (1978)

Record low18° (1991)

Fri, 0651° / 37°

0.09

51 °

Harlem, Friday, 6 November

Climate normal for this date — 60-year average.

Average high51°

Average low37°

Average precipitation0.09 in

Chance of precipitation28%

Record high70° (1975)

Record low21° (1991)

Sat, 0750° / 36°

0.03

50 °

Harlem, Saturday, 7 November

Climate normal for this date — 60-year average.

Average high50°

Average low36°

Average precipitation0.03 in

Chance of precipitation17%

Record high67° (2020)

Record low10° (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 Harlem, 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 Harlem, 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.