Monthly outlook for Cicero, IL: average high 79.9°, average low 66.8°. That is 0.2° below the climate normal for August. Precipitation is expected on 6 days (about 2.3 inches), against a normal of 6 days and 1.9 inches. The warmest day looks like 11 August (86.8°), the coolest 23 August (58.6°).
79.9°/66.8°
Average high / low
−0.2°
Below normal
6 / 6
Wet days / normal
2.3 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
8 August – 17 August
81.2°
80.4°
+0.4°
18 August – 27 August
77.6°
80.3°
-1.5°
28 August – 6 September
at normal
78.7°
—
August records over 66 years
98.8°24 August 2023All-time high
48.2°22 August 2024All-time low
Sun, 0983° / 66°1.48
83 °
Cicero, Sunday, 9 August
Heavy rain. High 83°, low 66°.
Pressure29.91 inHg
Wind12.4 mph NW
Humidity92%
Visibility—
Dew point70°
Mon, 1084° / 73°0.07
84 °
Cicero, Monday, 10 August
Light rain. High 84°, low 73°.
Pressure29.88 inHg
Wind3.9 mph SE
Humidity66%
Visibility6.2 mi
Dew point69°
Tue, 1187° / 73°0.17
87 °
Cicero, Tuesday, 11 August
Rain. High 87°, low 73°.
Pressure29.80 inHg
Wind9.1 mph W
Humidity54%
Visibility6.2 mi
Dew point69°
Wed, 1286° / 70°0.02
86 °
Cicero, Wednesday, 12 August
Light rain. High 86°, low 70°.
Pressure29.85 inHg
Wind4.9 mph NE
Humidity60%
Visibility6.2 mi
Dew point64°
Thu, 1372° / 66°0.06
72 °
Cicero, Thursday, 13 August
Light rain. High 72°, low 66°.
Pressure29.94 inHg
Wind10.4 mph NE
Humidity64%
Visibility—
Dew point58°
Fri, 1475° / 63°0
75 °
Cicero, Friday, 14 August
Clear. High 75°, low 63°.
Pressure30.18 inHg
Wind10.6 mph NE
Humidity42%
Visibility—
Dew point49°
Sat, 1580° / 62°0
80 °
Cicero, Saturday, 15 August
Overcast. High 80°, low 62°.
Pressure30.30 inHg
Wind4.9 mph S
Humidity34%
Visibility—
Dew point46°
Sun, 1681° / 62°0
81 °
Cicero, Sunday, 16 August
Partly cloudy. High 81°, low 62°.
Pressure30.18 inHg
Wind9.8 mph SW
Humidity41%
Visibility—
Dew point52°
Mon, 1780° / 69°0.07
80 °
Cicero, Monday, 17 August
Light rain. High 80°, low 69°.
Pressure30.00 inHg
Wind5.2 mph S
Humidity80%
Visibility—
Dew point67°
Tue, 1883° / 71°0
83 °
Cicero, Tuesday, 18 August
Light rain. High 83°, low 71°.
Pressure30.03 inHg
Wind8.7 mph NE
Humidity53%
Visibility—
Dew point63°
Wed, 1986° / 69°0.41
86 °
Cicero, Wednesday, 19 August
Rain. High 86°, low 69°.
Pressure29.91 inHg
Wind8.3 mph SW
Humidity52%
Visibility—
Dew point64°
Thu, 2076° / 69°0.03
76 °
Cicero, Thursday, 20 August
Light rain. High 76°, low 69°.
Pressure29.88 inHg
Wind9 mph N
Humidity68%
Visibility—
Dew point64°
Fri, 2178° / 66°0
78 °
Cicero, Friday, 21 August
Partly cloudy. High 78°, low 66°.
Pressure29.97 inHg
Wind8.9 mph NE
Humidity54%
Visibility—
Dew point59°
Sat, 2275° / 62°0.01
75 °
Cicero, Saturday, 22 August
Light rain. High 75°, low 62°.
Pressure29.94 inHg
Wind14.1 mph N
Humidity68%
Visibility—
Dew point61°
Sun, 2366° / 59°0
66 °
Cicero, Sunday, 23 August
Clear. High 66°, low 59°.
Pressure30.24 inHg
Wind11.3 mph NE
Humidity43%
Visibility—
Dew point42°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 2480° / 66°0.13
80 °
Cicero, Monday, 24 August
Climate normal for this date — 60-year average.
Average high80°
Average low66°
Average precipitation0.13 in
Chance of precipitation28%
Record high99° (2023)
Record low56° (1966)
Tue, 2581° / 65°0.08
81 °
Cicero, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high81°
Average low65°
Average precipitation0.08 in
Chance of precipitation28%
Record high92° (2021)
Record low51° (2017)
Wed, 2681° / 66°0.16
81 °
Cicero, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high81°
Average low66°
Average precipitation0.16 in
Chance of precipitation35%
Record high96° (2024)
Record low54° (2025)
Thu, 2781° / 67°0.14
81 °
Cicero, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high81°
Average low67°
Average precipitation0.14 in
Chance of precipitation33%
Record high97° (2024)
Record low54° (2025)
Fri, 2880° / 66°0.14
80 °
Cicero, Friday, 28 August
Climate normal for this date — 60-year average.
Average high80°
Average low66°
Average precipitation0.14 in
Chance of precipitation38%
Record high93° (1984)
Record low51° (1986)
Sat, 2980° / 65°0.11
80 °
Cicero, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high80°
Average low65°
Average precipitation0.11 in
Chance of precipitation30%
Record high94° (1984)
Record low49° (1965)
Sun, 3079° / 65°0.09
79 °
Cicero, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high79°
Average low65°
Average precipitation0.09 in
Chance of precipitation30%
Record high93° (2013)
Record low53° (1986)
Mon, 3179° / 64°0.06
79 °
Cicero, Monday, 31 August
Climate normal for this date — 60-year average.
Average high79°
Average low64°
Average precipitation0.06 in
Chance of precipitation25%
Record high90° (2012)
Record low55° (2023)
Tue, 0179° / 64°0.13
79 °
Cicero, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high79°
Average low64°
Average precipitation0.13 in
Chance of precipitation30%
Record high94° (2011)
Record low53° (1967)
Wed, 0279° / 65°0.06
79 °
Cicero, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high79°
Average low65°
Average precipitation0.06 in
Chance of precipitation25%
Record high92° (2011)
Record low51° (1965)
Thu, 0379° / 64°0.08
79 °
Cicero, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high79°
Average low64°
Average precipitation0.08 in
Chance of precipitation27%
Record high94° (2023)
Record low52° (1974)
Fri, 0478° / 64°0.09
78 °
Cicero, Friday, 4 September
Climate normal for this date — 60-year average.
Average high78°
Average low64°
Average precipitation0.09 in
Chance of precipitation33%
Record high92° (2023)
Record low50° (2025)
Sat, 0578° / 63°0.07
78 °
Cicero, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high78°
Average low63°
Average precipitation0.07 in
Chance of precipitation27%
Record high91° (2023)
Record low52° (1974)
Sun, 0677° / 63°0.1
77 °
Cicero, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high77°
Average low63°
Average precipitation0.1 in
Chance of precipitation38%
Record high92° (1990)
Record low49° (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 Cicero, 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 Cicero, 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.