Monthly outlook for Orland Hills, IL: average high 80.3°, average low 64°. That is 0.2° above the climate normal for August. Precipitation is expected on 8 days (about 2.9 inches), against a normal of 6 days and 1.9 inches. The warmest day looks like 10 August (92.4°), the coolest 18 August (59.5°).
80.3°/64°
Average high / low
+0.2°
Above normal
8 / 6
Wet days / normal
2.9 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
9 August – 18 August
81.2°
80°
+0.7°
19 August – 28 August
78.7°
80°
-0.7°
29 August – 7 September
at normal
78.3°
—
August records over 66 years
97°24 August 2023All-time high
46.8°29 August 1965All-time low
Mon, 1092° / 73°0.38
92 °
Orland Hills, Monday, 10 August
Rain. High 92°, low 73°.
Pressure29.88 inHg
Wind8.7 mph SW
Humidity62%
Visibility6.2 mi
Dew point73°
Tue, 1188° / 66°1.12
88 °
Orland Hills, Tuesday, 11 August
Heavy rain. High 88°, low 66°.
Pressure29.83 inHg
Wind9.6 mph S
Humidity68%
Visibility6.2 mi
Dew point74°
Wed, 1286° / 68°0.09
86 °
Orland Hills, Wednesday, 12 August
Rain. High 86°, low 68°.
Pressure29.85 inHg
Wind1.9 mph N
Humidity56%
Visibility6.2 mi
Dew point65°
Thu, 1374° / 64°0.22
74 °
Orland Hills, Thursday, 13 August
Light rain. High 74°, low 64°.
Pressure29.94 inHg
Wind6.1 mph E
Humidity59%
Visibility6.2 mi
Dew point60°
Fri, 1476° / 63°0
76 °
Orland Hills, Friday, 14 August
Overcast. High 76°, low 63°.
Pressure30.12 inHg
Wind11.9 mph E
Humidity50%
Visibility—
Dew point54°
Sat, 1575° / 63°0.03
75 °
Orland Hills, Saturday, 15 August
Light rain. High 75°, low 63°.
Pressure30.24 inHg
Wind11.9 mph SE
Humidity61%
Visibility—
Dew point55°
Sun, 1679° / 64°0.23
79 °
Orland Hills, Sunday, 16 August
Rain. High 79°, low 64°.
Pressure29.97 inHg
Wind11 mph NW
Humidity73%
Visibility—
Dew point68°
Mon, 1776° / 64°0
76 °
Orland Hills, Monday, 17 August
Overcast. High 76°, low 64°.
Pressure30.09 inHg
Wind7 mph N
Humidity52%
Visibility—
Dew point55°
Tue, 1879° / 59°0
79 °
Orland Hills, Tuesday, 18 August
Overcast. High 79°, low 59°.
Pressure29.91 inHg
Wind7.9 mph S
Humidity72%
Visibility—
Dew point62°
Wed, 1979° / 66°0.03
79 °
Orland Hills, Wednesday, 19 August
Light rain. High 79°, low 66°.
Pressure29.80 inHg
Wind12.8 mph NW
Humidity53%
Visibility—
Dew point59°
Thu, 2072° / 63°0.21
72 °
Orland Hills, Thursday, 20 August
Light rain. High 72°, low 63°.
Pressure29.94 inHg
Wind5.6 mph SE
Humidity81%
Visibility—
Dew point63°
Fri, 2182° / 61°0.51
82 °
Orland Hills, Friday, 21 August
Heavy rain. High 82°, low 61°.
Pressure29.85 inHg
Wind16.9 mph S
Humidity61%
Visibility—
Dew point61°
Sat, 2282° / 65°0.02
82 °
Orland Hills, Saturday, 22 August
Light rain. High 82°, low 65°.
Pressure29.80 inHg
Wind13.3 mph NW
Humidity48%
Visibility—
Dew point58°
Sun, 2378° / 61°0
78 °
Orland Hills, Sunday, 23 August
Clear. High 78°, low 61°.
Pressure30.12 inHg
Wind9.8 mph NW
Humidity38%
Visibility—
Dew point47°
Mon, 2479° / 62°0
79 °
Orland Hills, Monday, 24 August
Clear. High 79°, low 62°.
Pressure30.21 inHg
Wind7.7 mph W
Humidity54%
Visibility—
Dew point58°
From day 17 onward the outlook is built from 60-year climate statistics
Tue, 2580° / 65°0.09
80 °
Orland Hills, 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 °
Orland Hills, 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 °
Orland Hills, 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 °
Orland Hills, 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 °
Orland Hills, 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 °
Orland Hills, 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 °
Orland Hills, 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 °
Orland Hills, 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 °
Orland Hills, 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 °
Orland Hills, 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 °
Orland Hills, 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 °
Orland Hills, 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 °
Orland Hills, 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)
Mon, 0777° / 62°0.15
77 °
Orland Hills, Monday, 7 September
Climate normal for this date — 60-year average.
Average high77°
Average low62°
Average precipitation0.15 in
Chance of precipitation30%
Record high92° (1960)
Record low48° (2025)
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 Orland Hills, 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 Orland Hills, 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.