As of 16:22 CDT

Weather in Harlem, IL

83°

Harlem, Saturday, 8 August, 16:22

Clear. Feels like 85°. High 83°, low 67°.

Pressure30.00 inHg

Wind1 mph N

Humidity53%

Visibility6.2 mi

Dew point65°

See detailed hourly forecast

Monthly outlook for Harlem, IL: average high 77.7°, average low 61.3°. That is 1.2° below the climate normal for August. Precipitation is expected on 7 days (about 3.1 inches), against a normal of 5 days and 1.8 inches. The warmest day looks like 10 August (84.6°), the coolest 23 August (44.6°).

77.7°/61.3°

Average high / low

−1.2°

Below normal

7 / 5

Wet days / normal

3.1 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
8 August – 17 August	79.1°	79.9°	-0.5°
18 August – 27 August	75.3°	79.8°	-2.5°
28 August – 6 September	at normal	78.2°	—

August records over 66 years

98.8°23 August 2023All-time high

44.1°29 August 1965All-time low

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

Sun, 0984° / 63°

1.42

84 °

Harlem, Sunday, 9 August

Heavy rain. High 84°, low 63°.

Pressure29.91 inHg

Wind10.4 mph S

Humidity94%

Visibility6.2 mi

Dew point67°

Mon, 1085° / 70°

0.5

85 °

Harlem, Monday, 10 August

Heavy rain. High 85°, low 70°.

Pressure29.88 inHg

Wind10.7 mph S

Humidity72%

Visibility6.2 mi

Dew point73°

Tue, 1181° / 69°

0.42

81 °

Harlem, Tuesday, 11 August

Rain. High 81°, low 69°.

Pressure29.83 inHg

Wind8.5 mph N

Humidity86%

Visibility6.2 mi

Dew point74°

Wed, 1283° / 64°

0.02

83 °

Harlem, Wednesday, 12 August

Light rain. High 83°, low 64°.

Pressure29.88 inHg

Wind3.5 mph SW

Humidity76%

Visibility6.2 mi

Dew point70°

Thu, 1370° / 59°

0.1

70 °

Harlem, Thursday, 13 August

Light rain. High 70°, low 59°.

Pressure29.97 inHg

Wind11 mph NE

Humidity82%

Visibility—

Dew point61°

Fri, 1473° / 55°

73 °

Harlem, Friday, 14 August

Clear. High 73°, low 55°.

Pressure30.21 inHg

Wind7.4 mph E

Humidity58%

Visibility—

Dew point54°

Sat, 1574° / 55°

74 °

Harlem, Saturday, 15 August

Overcast. High 74°, low 55°.

Pressure30.30 inHg

Wind7.3 mph S

Humidity57%

Visibility—

Dew point55°

Sun, 1677° / 57°

77 °

Harlem, Sunday, 16 August

Partly cloudy. High 77°, low 57°.

Pressure30.18 inHg

Wind11 mph S

Humidity61%

Visibility—

Dew point59°

Mon, 1781° / 67°

0.03

81 °

Harlem, Monday, 17 August

Light rain. High 81°, low 67°.

Pressure29.97 inHg

Wind8.2 mph S

Humidity76%

Visibility—

Dew point69°

Tue, 1882° / 67°

82 °

Harlem, Tuesday, 18 August

Overcast. High 82°, low 67°.

Pressure30.03 inHg

Wind7.9 mph E

Humidity64%

Visibility—

Dew point66°

Wed, 1978° / 65°

0.43

78 °

Harlem, Wednesday, 19 August

Rain. High 78°, low 65°.

Pressure29.91 inHg

Wind9.5 mph S

Humidity82%

Visibility—

Dew point70°

Thu, 2075° / 65°

75 °

Harlem, Thursday, 20 August

Light rain. High 75°, low 65°.

Pressure29.91 inHg

Wind12.2 mph N

Humidity72%

Visibility—

Dew point65°

Fri, 2179° / 62°

0.01

79 °

Harlem, Friday, 21 August

Light rain. High 79°, low 62°.

Pressure29.97 inHg

Wind6.6 mph S

Humidity64%

Visibility—

Dew point63°

Sat, 2268° / 54°

0.04

68 °

Harlem, Saturday, 22 August

Light rain. High 68°, low 54°.

Pressure30.00 inHg

Wind15.2 mph NE

Humidity85%

Visibility—

Dew point60°

Sun, 2369° / 45°

69 °

Harlem, Sunday, 23 August

Clear. High 69°, low 45°.

Pressure30.24 inHg

Wind10.4 mph E

Humidity53%

Visibility—

Dew point47°

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

Mon, 2480° / 63°

0.1

80 °

Harlem, Monday, 24 August

Climate normal for this date — 60-year average.

Average high80°

Average low63°

Average precipitation0.1 in

Chance of precipitation28%

Record high98° (2023)

Record low52° (1984)

Tue, 2580° / 64°

0.07

80 °

Harlem, Tuesday, 25 August

Climate normal for this date — 60-year average.

Average high80°

Average low64°

Average precipitation0.07 in

Chance of precipitation20%

Record high92° (1991)

Record low51° (2017)

Wed, 2680° / 64°

0.16

80 °

Harlem, Wednesday, 26 August

Climate normal for this date — 60-year average.

Average high80°

Average low64°

Average precipitation0.16 in

Chance of precipitation30%

Record high94° (2003)

Record low50° (1964)

Thu, 2780° / 65°

0.11

80 °

Harlem, Thursday, 27 August

Climate normal for this date — 60-year average.

Average high80°

Average low65°

Average precipitation0.11 in

Chance of precipitation27%

Record high95° (2024)

Record low51° (1968)

Fri, 2880° / 64°

0.15

80 °

Harlem, Friday, 28 August

Climate normal for this date — 60-year average.

Average high80°

Average low64°

Average precipitation0.15 in

Chance of precipitation35%

Record high92° (1984)

Record low46° (1986)

Sat, 2980° / 63°

0.13

80 °

Harlem, Saturday, 29 August

Climate normal for this date — 60-year average.

Average high80°

Average low63°

Average precipitation0.13 in

Chance of precipitation22%

Record high93° (1984)

Record low44° (1965)

Sun, 3078° / 63°

0.06

78 °

Harlem, Sunday, 30 August

Climate normal for this date — 60-year average.

Average high78°

Average low63°

Average precipitation0.06 in

Chance of precipitation30%

Record high93° (2013)

Record low53° (2009)

Mon, 3178° / 62°

0.07

78 °

Harlem, Monday, 31 August

Climate normal for this date — 60-year average.

Average high78°

Average low62°

Average precipitation0.07 in

Chance of precipitation23%

Record high91° (2012)

Record low46° (2009)

Tue, 0178° / 62°

0.09

78 °

Harlem, Tuesday, 1 September

Climate normal for this date — 60-year average.

Average high78°

Average low62°

Average precipitation0.09 in

Chance of precipitation30%

Record high92° (2011)

Record low46° (1967)

Wed, 0279° / 62°

0.05

79 °

Harlem, Wednesday, 2 September

Climate normal for this date — 60-year average.

Average high79°

Average low62°

Average precipitation0.05 in

Chance of precipitation25%

Record high92° (2008)

Record low47° (1967)

Thu, 0378° / 62°

0.11

78 °

Harlem, Thursday, 3 September

Climate normal for this date — 60-year average.

Average high78°

Average low62°

Average precipitation0.11 in

Chance of precipitation35%

Record high94° (2023)

Record low47° (1974)

Fri, 0477° / 61°

0.09

77 °

Harlem, Friday, 4 September

Climate normal for this date — 60-year average.

Average high77°

Average low61°

Average precipitation0.09 in

Chance of precipitation32%

Record high93° (2023)

Record low45° (1974)

Sat, 0577° / 60°

0.06

77 °

Harlem, Saturday, 5 September

Climate normal for this date — 60-year average.

Average high77°

Average low60°

Average precipitation0.06 in

Chance of precipitation25%

Record high89° (2023)

Record low48° (1974)

Sun, 0677° / 61°

0.1

77 °

Harlem, Sunday, 6 September

Climate normal for this date — 60-year average.

Average high77°

Average low61°

Average precipitation0.1 in

Chance of precipitation32%

Record high90° (1990)

Record low46° (1988)

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.