Monthly outlook for Brisbane, IL: average high 77.9°, average low 63°. That is 1.2° below the climate normal for August. Precipitation is expected on 4 days (about 0.4 inches), against a normal of 6 days and 1.9 inches. The warmest day looks like 9 August (88.6°), the coolest 21 August (53.8°).
77.9°/63°
Average high / low
−1.2°
Below normal
4 / 6
Wet days / normal
0.4 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
8 August – 17 August
79.5°
80.1°
-0.3°
18 August – 27 August
75.1°
80°
-2.7°
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 (9 mi).
Sun, 0989° / 64°0.05
89 °
Brisbane, Sunday, 9 August
Light rain. High 89°, low 64°.
Pressure29.94 inHg
Wind13.7 mph S
Humidity76%
Visibility6.2 mi
Dew point74°
Mon, 1087° / 72°0.14
87 °
Brisbane, Monday, 10 August
Rain. High 87°, low 72°.
Pressure29.91 inHg
Wind9.4 mph SW
Humidity70%
Visibility6.2 mi
Dew point73°
Tue, 1183° / 71°0.11
83 °
Brisbane, Tuesday, 11 August
Rain. High 83°, low 71°.
Pressure29.80 inHg
Wind11.6 mph SW
Humidity83%
Visibility6.2 mi
Dew point72°
Wed, 1283° / 68°0.01
83 °
Brisbane, Wednesday, 12 August
Light rain. High 83°, low 68°.
Pressure29.85 inHg
Wind4.8 mph N
Humidity62%
Visibility6.2 mi
Dew point68°
Thu, 1374° / 64°0.01
74 °
Brisbane, Thursday, 13 August
Light rain. High 74°, low 64°.
Pressure30.00 inHg
Wind7.9 mph E
Humidity64%
Visibility—
Dew point60°
Fri, 1479° / 60°0
79 °
Brisbane, Friday, 14 August
Clear. High 79°, low 60°.
Pressure30.09 inHg
Wind6.8 mph E
Humidity52%
Visibility—
Dew point56°
Sat, 1567° / 60°0.01
67 °
Brisbane, Saturday, 15 August
Light rain. High 67°, low 60°.
Pressure30.30 inHg
Wind6 mph E
Humidity76%
Visibility—
Dew point56°
Sun, 1672° / 63°0
72 °
Brisbane, Sunday, 16 August
Overcast. High 72°, low 63°.
Pressure30.15 inHg
Wind5.4 mph E
Humidity77%
Visibility—
Dew point59°
Mon, 1778° / 64°0
78 °
Brisbane, Monday, 17 August
Overcast. High 78°, low 64°.
Pressure30.06 inHg
Wind5.9 mph W
Humidity67%
Visibility—
Dew point62°
Tue, 1881° / 65°0
81 °
Brisbane, Tuesday, 18 August
Overcast. High 81°, low 65°.
Pressure29.97 inHg
Wind9.4 mph SW
Humidity69%
Visibility—
Dew point66°
Wed, 1974° / 62°0.06
74 °
Brisbane, Wednesday, 19 August
Light rain. High 74°, low 62°.
Pressure29.91 inHg
Wind12.3 mph NW
Humidity62%
Visibility—
Dew point60°
Thu, 2067° / 56°0.01
67 °
Brisbane, Thursday, 20 August
Light rain. High 67°, low 56°.
Pressure30.06 inHg
Wind9.3 mph N
Humidity66%
Visibility—
Dew point53°
Fri, 2175° / 54°0
75 °
Brisbane, Friday, 21 August
Partly cloudy. High 75°, low 54°.
Pressure30.06 inHg
Wind6.4 mph E
Humidity55%
Visibility—
Dew point54°
Sat, 2272° / 55°0.01
72 °
Brisbane, Saturday, 22 August
Light rain. High 72°, low 55°.
Pressure29.88 inHg
Wind9.8 mph SE
Humidity77%
Visibility—
Dew point59°
Sun, 2381° / 64°0
81 °
Brisbane, Sunday, 23 August
Clear. High 81°, low 64°.
Pressure29.91 inHg
Wind13 mph W
Humidity54%
Visibility—
Dew point61°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 2480° / 65°0.13
80 °
Brisbane, 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 °
Brisbane, 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 °
Brisbane, 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 °
Brisbane, 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 °
Brisbane, 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 °
Brisbane, 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 °
Brisbane, 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 °
Brisbane, 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 °
Brisbane, 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 °
Brisbane, 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 °
Brisbane, 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 °
Brisbane, 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 °
Brisbane, 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 °
Brisbane, 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 Brisbane, 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 Brisbane, 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.