Monthly outlook for Lily Cache, IL: average high 78.4°, average low 63.2°. That is 1.4° below the climate normal for August. Precipitation is expected on 4 days (about 2.2 inches), against a normal of 5 days and 1.7 inches. The warmest day looks like 11 August (86.4°), the coolest 23 August (52.3°).
78.4°/63.2°
Average high / low
−1.4°
Below normal
4 / 5
Wet days / normal
2.2 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
8 August – 17 August
78.9°
81°
-1.2°
18 August – 27 August
77.5°
81°
-1.9°
28 August – 6 September
at normal
79.5°
—
August records over 66 years
97.9°24 August 2023All-time high
45.7°29 August 1986All-time low
Climate normals and records are computed from the nearest reference point — Joliet (5 mi).
Sun, 0985° / 64°1.49
85 °
Lily Cache, Sunday, 9 August
Heavy rain. High 85°, low 64°.
Pressure29.94 inHg
Wind5.2 mph W
Humidity95%
Visibility—
Dew point74°
Mon, 1083° / 71°0.03
83 °
Lily Cache, Monday, 10 August
Light rain. High 83°, low 71°.
Pressure29.91 inHg
Wind9.2 mph S
Humidity76%
Visibility6.2 mi
Dew point74°
Tue, 1186° / 73°0.14
86 °
Lily Cache, Tuesday, 11 August
Rain. High 86°, low 73°.
Pressure29.77 inHg
Wind11.9 mph SW
Humidity85%
Visibility6.2 mi
Dew point74°
Wed, 1279° / 68°0.01
79 °
Lily Cache, Wednesday, 12 August
Light rain. High 79°, low 68°.
Pressure29.88 inHg
Wind5.7 mph W
Humidity86%
Visibility6.2 mi
Dew point70°
Thu, 1372° / 60°0.04
72 °
Lily Cache, Thursday, 13 August
Light rain. High 72°, low 60°.
Pressure29.94 inHg
Wind12.8 mph E
Humidity73%
Visibility—
Dew point62°
Fri, 1473° / 57°0
73 °
Lily Cache, Friday, 14 August
Clear. High 73°, low 57°.
Pressure30.18 inHg
Wind7.9 mph NW
Humidity58%
Visibility—
Dew point56°
Sat, 1573° / 54°0
73 °
Lily Cache, Saturday, 15 August
Overcast. High 73°, low 54°.
Pressure30.33 inHg
Wind5.6 mph S
Humidity63%
Visibility—
Dew point57°
Sun, 1676° / 57°0
76 °
Lily Cache, Sunday, 16 August
Mostly clear. High 76°, low 57°.
Pressure30.21 inHg
Wind10.3 mph S
Humidity68%
Visibility—
Dew point60°
Mon, 1777° / 67°0.03
77 °
Lily Cache, Monday, 17 August
Light rain. High 77°, low 67°.
Pressure30.00 inHg
Wind6.6 mph S
Humidity89%
Visibility—
Dew point68°
Tue, 1885° / 66°0
85 °
Lily Cache, Tuesday, 18 August
Light rain. High 85°, low 66°.
Pressure30.00 inHg
Wind7.3 mph E
Humidity65%
Visibility—
Dew point68°
Wed, 1982° / 63°0.43
82 °
Lily Cache, Wednesday, 19 August
Rain. High 82°, low 63°.
Pressure29.91 inHg
Wind9.7 mph SW
Humidity74%
Visibility—
Dew point70°
Thu, 2077° / 66°0.02
77 °
Lily Cache, Thursday, 20 August
Light rain. High 77°, low 66°.
Pressure29.88 inHg
Wind9.2 mph N
Humidity74%
Visibility—
Dew point67°
Fri, 2179° / 63°0.02
79 °
Lily Cache, Friday, 21 August
Light rain. High 79°, low 63°.
Pressure29.97 inHg
Wind6.4 mph NE
Humidity60%
Visibility—
Dew point62°
Sat, 2276° / 59°0.02
76 °
Lily Cache, Saturday, 22 August
Light rain. High 76°, low 59°.
Pressure29.94 inHg
Wind15.5 mph NE
Humidity75%
Visibility—
Dew point65°
Sun, 2367° / 52°0
67 °
Lily Cache, Sunday, 23 August
Mostly clear. High 67°, low 52°.
Pressure30.24 inHg
Wind11.2 mph NE
Humidity51%
Visibility—
Dew point46°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 2481° / 64°0.12
81 °
Lily Cache, Monday, 24 August
Climate normal for this date — 60-year average.
Average high81°
Average low64°
Average precipitation0.12 in
Chance of precipitation27%
Record high98° (2023)
Record low53° (1967)
Tue, 2581° / 64°0.11
81 °
Lily Cache, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high81°
Average low64°
Average precipitation0.11 in
Chance of precipitation27%
Record high92° (1991)
Record low52° (2017)
Wed, 2682° / 66°0.17
82 °
Lily Cache, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high82°
Average low66°
Average precipitation0.17 in
Chance of precipitation35%
Record high95° (2024)
Record low51° (1964)
Thu, 2782° / 66°0.12
82 °
Lily Cache, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high82°
Average low66°
Average precipitation0.12 in
Chance of precipitation27%
Record high96° (2024)
Record low53° (2025)
Fri, 2881° / 65°0.11
81 °
Lily Cache, Friday, 28 August
Climate normal for this date — 60-year average.
Average high81°
Average low65°
Average precipitation0.11 in
Chance of precipitation25%
Record high93° (1984)
Record low48° (1986)
Sat, 2981° / 64°0.12
81 °
Lily Cache, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high81°
Average low64°
Average precipitation0.12 in
Chance of precipitation33%
Record high94° (1984)
Record low46° (1986)
Sun, 3080° / 64°0.07
80 °
Lily Cache, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high80°
Average low64°
Average precipitation0.07 in
Chance of precipitation22%
Record high93° (2013)
Record low50° (1986)
Mon, 3180° / 63°0.07
80 °
Lily Cache, Monday, 31 August
Climate normal for this date — 60-year average.
Average high80°
Average low63°
Average precipitation0.07 in
Chance of precipitation22%
Record high90° (2011)
Record low51° (2009)
Tue, 0180° / 63°0.11
80 °
Lily Cache, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high80°
Average low63°
Average precipitation0.11 in
Chance of precipitation30%
Record high96° (2011)
Record low49° (2009)
Wed, 0280° / 63°0.06
80 °
Lily Cache, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high80°
Average low63°
Average precipitation0.06 in
Chance of precipitation22%
Record high94° (2008)
Record low47° (2017)
Thu, 0380° / 63°0.08
80 °
Lily Cache, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high80°
Average low63°
Average precipitation0.08 in
Chance of precipitation25%
Record high93° (2023)
Record low49° (1974)
Fri, 0478° / 62°0.1
78 °
Lily Cache, Friday, 4 September
Climate normal for this date — 60-year average.
Average high78°
Average low62°
Average precipitation0.1 in
Chance of precipitation28%
Record high92° (2023)
Record low47° (1974)
Sat, 0579° / 62°0.06
79 °
Lily Cache, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high79°
Average low62°
Average precipitation0.06 in
Chance of precipitation17%
Record high90° (1983)
Record low50° (1974)
Sun, 0678° / 62°0.12
78 °
Lily Cache, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high78°
Average low62°
Average precipitation0.12 in
Chance of precipitation37%
Record high92° (1990)
Record low48° (1988)
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 Lily Cache, 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 Lily Cache, 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.