As of 15:24 CDT

Weather in Alpine, IL

84°

Alpine, Saturday, 8 August, 15:24

Clear. Feels like 87°. High 84°, low 69°.

Pressure29.97 inHg

Wind3 mph W

Humidity55%

Visibility6.2 mi

Dew point65°

See detailed hourly forecast

Monthly outlook for Alpine, IL: average high 78.8°, average low 64.5°. That is 0.6° below the climate normal for August. Precipitation is expected on 6 days (about 2.4 inches), against a normal of 6 days and 1.9 inches. The warmest day looks like 11 August (86.4°), the coolest 23 August (54.4°).

78.8°/64.5°

Average high / low

−0.6°

Below normal

6 / 6

Wet days / normal

2.4 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
8 August – 17 August	79°	80.1°	-0.6°
18 August – 27 August	78.5°	80°	-0.8°
28 August – 6 September	at normal	78.6°	—

August records over 66 years

97°24 August 2023All-time high

46.8°29 August 1965All-time low

Climate normals and records are computed from the nearest reference point — Orland Hills (2 mi).

Sun, 0983° / 65°

1.61

83 °

Alpine, Sunday, 9 August

Heavy rain. High 83°, low 65°.

Pressure29.94 inHg

Wind11.9 mph W

Humidity86%

Visibility3.3 mi

Dew point74°

Mon, 1083° / 72°

0.07

83 °

Alpine, Monday, 10 August

Light rain. High 83°, low 72°.

Pressure29.91 inHg

Wind6.2 mph SE

Humidity70%

Visibility6.2 mi

Dew point72°

Tue, 1186° / 73°

0.15

86 °

Alpine, Tuesday, 11 August

Light rain. High 86°, low 73°.

Pressure29.77 inHg

Wind14.2 mph SW

Humidity79%

Visibility6.2 mi

Dew point73°

Wed, 1280° / 69°

0.01

80 °

Alpine, Wednesday, 12 August

Light rain. High 80°, low 69°.

Pressure29.83 inHg

Wind5.3 mph E

Humidity78%

Visibility6.2 mi

Dew point68°

Thu, 1372° / 62°

0.03

72 °

Alpine, Thursday, 13 August

Light rain. High 72°, low 62°.

Pressure29.94 inHg

Wind11.8 mph NE

Humidity68%

Visibility—

Dew point60°

Fri, 1475° / 60°

75 °

Alpine, Friday, 14 August

Clear. High 75°, low 60°.

Pressure30.18 inHg

Wind7.3 mph NE

Humidity45%

Visibility—

Dew point50°

Sat, 1574° / 57°

74 °

Alpine, Saturday, 15 August

Overcast. High 74°, low 57°.

Pressure30.33 inHg

Wind6.1 mph S

Humidity54%

Visibility—

Dew point54°

Sun, 1677° / 58°

77 °

Alpine, Sunday, 16 August

Clear. High 77°, low 58°.

Pressure30.21 inHg

Wind9.6 mph S

Humidity61%

Visibility—

Dew point58°

Mon, 1775° / 68°

0.08

75 °

Alpine, Monday, 17 August

Light rain. High 75°, low 68°.

Pressure30.00 inHg

Wind6.3 mph S

Humidity91%

Visibility—

Dew point68°

Tue, 1884° / 68°

84 °

Alpine, Tuesday, 18 August

Light rain. High 84°, low 68°.

Pressure30.00 inHg

Wind8.5 mph NE

Humidity56%

Visibility—

Dew point64°

Wed, 1982° / 65°

0.38

82 °

Alpine, Wednesday, 19 August

Rain. High 82°, low 65°.

Pressure29.91 inHg

Wind8.8 mph SW

Humidity68%

Visibility—

Dew point68°

Thu, 2081° / 67°

0.04

81 °

Alpine, Thursday, 20 August

Light rain. High 81°, low 67°.

Pressure29.88 inHg

Wind8.7 mph NE

Humidity61%

Visibility—

Dew point64°

Fri, 2181° / 65°

81 °

Alpine, Friday, 21 August

Mostly clear. High 81°, low 65°.

Pressure29.94 inHg

Wind7.4 mph NE

Humidity52%

Visibility—

Dew point59°

Sat, 2278° / 61°

0.02

78 °

Alpine, Saturday, 22 August

Light rain. High 78°, low 61°.

Pressure29.91 inHg

Wind14.7 mph NE

Humidity66%

Visibility—

Dew point63°

Sun, 2366° / 54°

66 °

Alpine, Sunday, 23 August

Mostly clear. High 66°, low 54°.

Pressure30.24 inHg

Wind11.5 mph NE

Humidity45%

Visibility—

Dew point43°

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

Mon, 2480° / 65°

0.13

80 °

Alpine, Monday, 24 August

Climate normal for this date — 60-year average.

Average high80°

Average low65°

Average precipitation0.13 in

Chance of precipitation27%

Record high97° (2023)

Record low55° (1965)

Tue, 2580° / 65°

0.09

80 °

Alpine, Tuesday, 25 August

Climate normal for this date — 60-year average.

Average high80°

Average low65°

Average precipitation0.09 in

Chance of precipitation28%

Record high91° (2003)

Record low51° (2017)

Wed, 2681° / 66°

0.15

81 °

Alpine, Wednesday, 26 August

Climate normal for this date — 60-year average.

Average high81°

Average low66°

Average precipitation0.15 in

Chance of precipitation40%

Record high93° (2024)

Record low53° (1964)

Thu, 2781° / 66°

0.12

81 °

Alpine, Thursday, 27 August

Climate normal for this date — 60-year average.

Average high81°

Average low66°

Average precipitation0.12 in

Chance of precipitation33%

Record high95° (2024)

Record low54° (2025)

Fri, 2880° / 65°

0.15

80 °

Alpine, Friday, 28 August

Climate normal for this date — 60-year average.

Average high80°

Average low65°

Average precipitation0.15 in

Chance of precipitation35%

Record high92° (1984)

Record low50° (1986)

Sat, 2980° / 65°

0.13

80 °

Alpine, Saturday, 29 August

Climate normal for this date — 60-year average.

Average high80°

Average low65°

Average precipitation0.13 in

Chance of precipitation37%

Record high93° (1984)

Record low47° (1965)

Sun, 3079° / 64°

0.09

79 °

Alpine, Sunday, 30 August

Climate normal for this date — 60-year average.

Average high79°

Average low64°

Average precipitation0.09 in

Chance of precipitation32%

Record high92° (2013)

Record low51° (1986)

Mon, 3179° / 64°

0.06

79 °

Alpine, Monday, 31 August

Climate normal for this date — 60-year average.

Average high79°

Average low64°

Average precipitation0.06 in

Chance of precipitation23%

Record high89° (2012)

Record low53° (2023)

Tue, 0179° / 63°

0.13

79 °

Alpine, Tuesday, 1 September

Climate normal for this date — 60-year average.

Average high79°

Average low63°

Average precipitation0.13 in

Chance of precipitation30%

Record high95° (2011)

Record low51° (2009)

Wed, 0279° / 64°

0.07

79 °

Alpine, Wednesday, 2 September

Climate normal for this date — 60-year average.

Average high79°

Average low64°

Average precipitation0.07 in

Chance of precipitation27%

Record high92° (2008)

Record low49° (2017)

Thu, 0379° / 64°

0.07

79 °

Alpine, Thursday, 3 September

Climate normal for this date — 60-year average.

Average high79°

Average low64°

Average precipitation0.07 in

Chance of precipitation28%

Record high92° (2023)

Record low51° (1974)

Fri, 0477° / 63°

0.09

77 °

Alpine, Friday, 4 September

Climate normal for this date — 60-year average.

Average high77°

Average low63°

Average precipitation0.09 in

Chance of precipitation32%

Record high90° (2023)

Record low50° (2025)

Sat, 0578° / 62°

0.07

78 °

Alpine, Saturday, 5 September

Climate normal for this date — 60-year average.

Average high78°

Average low62°

Average precipitation0.07 in

Chance of precipitation23%

Record high89° (2023)

Record low51° (1974)

Sun, 0677° / 62°

0.11

77 °

Alpine, Sunday, 6 September

Climate normal for this date — 60-year average.

Average high77°

Average low62°

Average precipitation0.11 in

Chance of precipitation42%

Record high91° (1990)

Record low49° (1962)

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 Alpine, 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 Alpine, 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.