Monthly outlook for Crystal Gardens, IL: average high 77.3°, average low 60.8°. That is 1.4° below the climate normal for August. Precipitation is expected on 8 days (about 2.8 inches), against a normal of 6 days and 1.8 inches. The warmest day looks like 10 August (88.1°), the coolest 23 August (53.6°).
77.3°/60.8°
Average high / low
−1.4°
Below normal
8 / 6
Wet days / normal
2.8 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
9 August – 18 August
77.9°
79.8°
-1.1°
19 August – 28 August
76.3°
79.9°
-2°
29 August – 7 September
at normal
78.1°
—
August records over 66 years
98.1°24 August 2023All-time high
46.4°29 August 1986All-time low
Climate normals and records are computed from the nearest reference point — Elgin (14 mi).
Mon, 1088° / 71°0.5
88 °
Crystal Gardens, Monday, 10 August
Heavy rain. High 88°, low 71°.
Pressure29.91 inHg
Wind4.2 mph E
Humidity72%
Visibility6.2 mi
Dew point73°
Tue, 1181° / 65°0.82
81 °
Crystal Gardens, Tuesday, 11 August
Heavy rain. High 81°, low 65°.
Pressure29.80 inHg
Wind10.4 mph S
Humidity76%
Visibility6.2 mi
Dew point73°
Wed, 1283° / 62°0
83 °
Crystal Gardens, Wednesday, 12 August
Mostly clear. High 83°, low 62°.
Pressure29.85 inHg
Wind3.6 mph NW
Humidity66%
Visibility6.2 mi
Dew point67°
Thu, 1372° / 61°0.07
72 °
Crystal Gardens, Thursday, 13 August
Light rain. High 72°, low 61°.
Pressure29.97 inHg
Wind6.5 mph E
Humidity76%
Visibility6.2 mi
Dew point65°
Fri, 1472° / 58°0
72 °
Crystal Gardens, Friday, 14 August
Overcast. High 72°, low 58°.
Pressure30.15 inHg
Wind15 mph E
Humidity57%
Visibility—
Dew point54°
Sat, 1574° / 60°0.04
74 °
Crystal Gardens, Saturday, 15 August
Light rain. High 74°, low 60°.
Pressure30.21 inHg
Wind12.6 mph SE
Humidity59%
Visibility—
Dew point56°
Sun, 1673° / 64°0.21
73 °
Crystal Gardens, Sunday, 16 August
Light rain. High 73°, low 64°.
Pressure30.00 inHg
Wind12.2 mph NW
Humidity84%
Visibility—
Dew point65°
Mon, 1776° / 60°0
76 °
Crystal Gardens, Monday, 17 August
Overcast. High 76°, low 60°.
Pressure30.12 inHg
Wind7.7 mph N
Humidity62%
Visibility—
Dew point58°
Tue, 1877° / 59°0
77 °
Crystal Gardens, Tuesday, 18 August
Overcast. High 77°, low 59°.
Pressure29.91 inHg
Wind10 mph S
Humidity84%
Visibility—
Dew point59°
Wed, 1973° / 61°0.01
73 °
Crystal Gardens, Wednesday, 19 August
Light rain. High 73°, low 61°.
Pressure29.83 inHg
Wind13.9 mph NW
Humidity75%
Visibility—
Dew point62°
Thu, 2073° / 58°0.14
73 °
Crystal Gardens, Thursday, 20 August
Light rain. High 73°, low 58°.
Pressure29.94 inHg
Wind6.9 mph SE
Humidity79%
Visibility—
Dew point62°
Fri, 2179° / 59°0.2
79 °
Crystal Gardens, Friday, 21 August
Rain. High 79°, low 59°.
Pressure29.77 inHg
Wind16.3 mph S
Humidity69%
Visibility—
Dew point62°
Sat, 2279° / 62°0.02
79 °
Crystal Gardens, Saturday, 22 August
Light rain. High 79°, low 62°.
Pressure29.80 inHg
Wind15.1 mph NW
Humidity53%
Visibility—
Dew point59°
Sun, 2376° / 54°0
76 °
Crystal Gardens, Sunday, 23 August
Light rain. High 76°, low 54°.
Pressure30.15 inHg
Wind7.6 mph NW
Humidity51%
Visibility—
Dew point52°
Mon, 2478° / 59°0
78 °
Crystal Gardens, Monday, 24 August
Clear. High 78°, low 59°.
Pressure30.21 inHg
Wind7.9 mph SW
Humidity62%
Visibility—
Dew point60°
From day 17 onward the outlook is built from 60-year climate statistics
Tue, 2580° / 64°0.08
80 °
Crystal Gardens, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high80°
Average low64°
Average precipitation0.08 in
Chance of precipitation25%
Record high92° (2003)
Record low53° (2025)
Wed, 2680° / 65°0.16
80 °
Crystal Gardens, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high80°
Average low65°
Average precipitation0.16 in
Chance of precipitation33%
Record high95° (2024)
Record low51° (2025)
Thu, 2780° / 65°0.11
80 °
Crystal Gardens, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high80°
Average low65°
Average precipitation0.11 in
Chance of precipitation28%
Record high96° (2024)
Record low53° (2025)
Fri, 2880° / 65°0.13
80 °
Crystal Gardens, Friday, 28 August
Climate normal for this date — 60-year average.
Average high80°
Average low65°
Average precipitation0.13 in
Chance of precipitation38%
Record high93° (1984)
Record low47° (1986)
Sat, 2980° / 64°0.13
80 °
Crystal Gardens, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high80°
Average low64°
Average precipitation0.13 in
Chance of precipitation28%
Record high94° (1984)
Record low46° (1986)
Sun, 3079° / 63°0.11
79 °
Crystal Gardens, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high79°
Average low63°
Average precipitation0.11 in
Chance of precipitation28%
Record high94° (2013)
Record low52° (1986)
Mon, 3179° / 63°0.09
79 °
Crystal Gardens, Monday, 31 August
Climate normal for this date — 60-year average.
Average high79°
Average low63°
Average precipitation0.09 in
Chance of precipitation20%
Record high90° (2012)
Record low51° (2009)
Tue, 0178° / 63°0.12
78 °
Crystal Gardens, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high78°
Average low63°
Average precipitation0.12 in
Chance of precipitation32%
Record high93° (2011)
Record low49° (2009)
Wed, 0278° / 63°0.04
78 °
Crystal Gardens, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high78°
Average low63°
Average precipitation0.04 in
Chance of precipitation23%
Record high92° (2008)
Record low49° (1967)
Thu, 0378° / 63°0.09
78 °
Crystal Gardens, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high78°
Average low63°
Average precipitation0.09 in
Chance of precipitation27%
Record high93° (2023)
Record low47° (1974)
Fri, 0477° / 62°0.1
77 °
Crystal Gardens, Friday, 4 September
Climate normal for this date — 60-year average.
Average high77°
Average low62°
Average precipitation0.1 in
Chance of precipitation32%
Record high92° (2023)
Record low47° (1974)
Sat, 0577° / 61°0.07
77 °
Crystal Gardens, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high77°
Average low61°
Average precipitation0.07 in
Chance of precipitation20%
Record high89° (2023)
Record low50° (1962)
Sun, 0677° / 61°0.12
77 °
Crystal Gardens, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high77°
Average low61°
Average precipitation0.12 in
Chance of precipitation35%
Record high91° (1990)
Record low48° (2025)
Mon, 0777° / 61°0.09
77 °
Crystal Gardens, Monday, 7 September
Climate normal for this date — 60-year average.
Average high77°
Average low61°
Average precipitation0.09 in
Chance of precipitation28%
Record high91° (1960)
Record low46° (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 Crystal Gardens, 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 Crystal Gardens, 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.