Monthly outlook for Norridge, IL: average high 84.5°, average low 69.3°. That is 2.7° above the climate normal for August. Precipitation is expected on 4 days (about 2.3 inches), against a normal of 5 days and 1.9 inches. The warmest day looks like 22 August (98.9°), the coolest 14 August (64.3°).
84.5°/69.3°
Average high / low
+2.7°
Above normal
4 / 5
Wet days / normal
2.3 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
9 August – 18 August
81.9°
79.7°
+1.2°
19 August – 28 August
88.7°
79.7°
+5°
29 August – 7 September
at normal
77.9°
—
August records over 66 years
99.1°24 August 2023All-time high
48.6°22 August 2024All-time low
Mon, 1089° / 70°1.09
89 °
Norridge, Monday, 10 August
Heavy rain. High 89°, low 70°.
Pressure29.91 inHg
Wind5.5 mph N
Humidity74%
Visibility6.2 mi
Dew point73°
Tue, 1184° / 68°0.05
84 °
Norridge, Tuesday, 11 August
Light rain. High 84°, low 68°.
Pressure29.85 inHg
Wind5.4 mph NE
Humidity88%
Visibility6.2 mi
Dew point70°
Wed, 1286° / 71°0.03
86 °
Norridge, Wednesday, 12 August
Light rain. High 86°, low 71°.
Pressure29.83 inHg
Wind3.4 mph NW
Humidity50%
Visibility6.2 mi
Dew point66°
Thu, 1376° / 68°0
76 °
Norridge, Thursday, 13 August
Overcast. High 76°, low 68°.
Pressure30.03 inHg
Wind9.5 mph NE
Humidity49%
Visibility—
Dew point54°
Fri, 1476° / 64°0
76 °
Norridge, Friday, 14 August
Partly cloudy. High 76°, low 64°.
Pressure30.18 inHg
Wind9.3 mph NE
Humidity36%
Visibility—
Dew point46°
Sat, 1580° / 66°0
80 °
Norridge, Saturday, 15 August
Overcast. High 80°, low 66°.
Pressure30.21 inHg
Wind8.7 mph E
Humidity31%
Visibility—
Dew point46°
Sun, 1680° / 68°0.01
80 °
Norridge, Sunday, 16 August
Light rain. High 80°, low 68°.
Pressure30.09 inHg
Wind5.2 mph SE
Humidity50%
Visibility—
Dew point58°
Mon, 1783° / 67°0.01
83 °
Norridge, Monday, 17 August
Light rain. High 83°, low 67°.
Pressure30.06 inHg
Wind6.9 mph NE
Humidity49%
Visibility—
Dew point60°
Tue, 1883° / 68°0
83 °
Norridge, Tuesday, 18 August
Overcast. High 83°, low 68°.
Pressure30.00 inHg
Wind3.7 mph NE
Humidity53%
Visibility—
Dew point57°
Wed, 1989° / 69°0.17
89 °
Norridge, Wednesday, 19 August
Light rain. High 89°, low 69°.
Pressure29.91 inHg
Wind12.1 mph SW
Humidity48%
Visibility—
Dew point63°
Thu, 2088° / 77°0
88 °
Norridge, Thursday, 20 August
Overcast. High 88°, low 77°.
Pressure29.77 inHg
Wind6.4 mph S
Humidity57%
Visibility—
Dew point67°
Fri, 2185° / 73°0
85 °
Norridge, Friday, 21 August
Clear. High 85°, low 73°.
Pressure29.94 inHg
Wind11.6 mph NE
Humidity44%
Visibility—
Dew point59°
Sat, 2299° / 71°0
99 °
Norridge, Saturday, 22 August
Clear. High 99°, low 71°.
Pressure29.85 inHg
Wind10.7 mph S
Humidity35%
Visibility—
Dew point61°
Sun, 2392° / 72°0
92 °
Norridge, Sunday, 23 August
Overcast. High 92°, low 72°.
Pressure29.83 inHg
Wind9.3 mph NE
Humidity41%
Visibility—
Dew point63°
Mon, 2480° / 70°0.02
80 °
Norridge, Monday, 24 August
Light rain. High 80°, low 70°.
Pressure30.03 inHg
Wind9.8 mph NE
Humidity60%
Visibility—
Dew point64°
From day 17 onward the outlook is built from 60-year climate statistics
Tue, 2580° / 66°0.07
80 °
Norridge, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high80°
Average low66°
Average precipitation0.07 in
Chance of precipitation23%
Record high93° (2021)
Record low52° (2017)
Wed, 2681° / 67°0.14
81 °
Norridge, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high81°
Average low67°
Average precipitation0.14 in
Chance of precipitation33%
Record high96° (2024)
Record low54° (2025)
Thu, 2780° / 68°0.11
80 °
Norridge, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high80°
Average low68°
Average precipitation0.11 in
Chance of precipitation35%
Record high98° (2024)
Record low56° (2025)
Fri, 2880° / 67°0.13
80 °
Norridge, Friday, 28 August
Climate normal for this date — 60-year average.
Average high80°
Average low67°
Average precipitation0.13 in
Chance of precipitation35%
Record high92° (1984)
Record low52° (1986)
Sat, 2980° / 66°0.11
80 °
Norridge, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high80°
Average low66°
Average precipitation0.11 in
Chance of precipitation30%
Record high94° (1984)
Record low49° (1965)
Sun, 3079° / 66°0.13
79 °
Norridge, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high79°
Average low66°
Average precipitation0.13 in
Chance of precipitation28%
Record high94° (2013)
Record low55° (2004)
Mon, 3178° / 65°0.07
78 °
Norridge, Monday, 31 August
Climate normal for this date — 60-year average.
Average high78°
Average low65°
Average precipitation0.07 in
Chance of precipitation22%
Record high91° (2012)
Record low55° (2023)
Tue, 0178° / 65°0.12
78 °
Norridge, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high78°
Average low65°
Average precipitation0.12 in
Chance of precipitation32%
Record high92° (2011)
Record low55° (1987)
Wed, 0278° / 65°0.05
78 °
Norridge, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high78°
Average low65°
Average precipitation0.05 in
Chance of precipitation23%
Record high91° (2011)
Record low51° (2017)
Thu, 0378° / 65°0.09
78 °
Norridge, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high78°
Average low65°
Average precipitation0.09 in
Chance of precipitation30%
Record high94° (2023)
Record low52° (1974)
Fri, 0477° / 64°0.09
77 °
Norridge, Friday, 4 September
Climate normal for this date — 60-year average.
Average high77°
Average low64°
Average precipitation0.09 in
Chance of precipitation30%
Record high93° (2023)
Record low50° (2025)
Sat, 0577° / 64°0.09
77 °
Norridge, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high77°
Average low64°
Average precipitation0.09 in
Chance of precipitation22%
Record high91° (2023)
Record low54° (2010)
Sun, 0677° / 64°0.1
77 °
Norridge, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high77°
Average low64°
Average precipitation0.1 in
Chance of precipitation35%
Record high92° (1990)
Record low50° (2025)
Mon, 0777° / 63°0.07
77 °
Norridge, Monday, 7 September
Climate normal for this date — 60-year average.
Average high77°
Average low63°
Average precipitation0.07 in
Chance of precipitation32%
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 Norridge, 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 Norridge, 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.