Monthly outlook for Groveland, IL: average high 87.8°, average low 68.8°. That is 3.5° above the climate normal for August. Precipitation is expected on 7 days (about 2.3 inches), against a normal of 5 days and 1.8 inches. The warmest day looks like 22 August (102.6°), the coolest 15 August (60.3°).
87.8°/68.8°
Average high / low
+3.5°
Above normal
7 / 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
83.5°
81.6°
+1.1°
19 August – 28 August
94.9°
81.7°
+7.3°
29 August – 7 September
at normal
80°
—
August records over 66 years
97.7°1 August 1988All-time high
47.1°29 August 1986All-time low
Climate normals and records are computed from the nearest reference point — Peoria (12 mi).
Mon, 1095° / 75°0
95 °
Groveland, Monday, 10 August
Overcast. High 95°, low 75°.
Pressure29.88 inHg
Wind9.9 mph W
Humidity54%
Visibility6.2 mi
Dew point70°
Tue, 1197° / 69°0.06
97 °
Groveland, Tuesday, 11 August
Light rain. High 97°, low 69°.
Pressure29.83 inHg
Wind10.4 mph W
Humidity52%
Visibility6.2 mi
Dew point71°
Wed, 1284° / 72°0.71
84 °
Groveland, Wednesday, 12 August
Heavy rain. High 84°, low 72°.
Pressure29.80 inHg
Wind4.2 mph E
Humidity93%
Visibility6.2 mi
Dew point72°
Thu, 1380° / 64°0.07
80 °
Groveland, Thursday, 13 August
Light rain. High 80°, low 64°.
Pressure29.97 inHg
Wind16.6 mph NE
Humidity62%
Visibility—
Dew point63°
Fri, 1468° / 61°1.05
68 °
Groveland, Friday, 14 August
Heavy rain. High 68°, low 61°.
Pressure30.15 inHg
Wind12.5 mph E
Humidity78%
Visibility—
Dew point55°
Sat, 1575° / 60°0.07
75 °
Groveland, Saturday, 15 August
Light rain. High 75°, low 60°.
Pressure30.18 inHg
Wind11.8 mph SE
Humidity73%
Visibility—
Dew point62°
Sun, 1680° / 65°0.02
80 °
Groveland, Sunday, 16 August
Light rain. High 80°, low 65°.
Pressure30.06 inHg
Wind7.9 mph SE
Humidity74%
Visibility—
Dew point69°
Mon, 1782° / 66°0
82 °
Groveland, Monday, 17 August
Partly cloudy. High 82°, low 66°.
Pressure30.09 inHg
Wind5.2 mph NE
Humidity63%
Visibility—
Dew point65°
Tue, 1883° / 66°0
83 °
Groveland, Tuesday, 18 August
Mostly clear. High 83°, low 66°.
Pressure30.00 inHg
Wind10.2 mph SE
Humidity62%
Visibility—
Dew point65°
Wed, 1998° / 72°0
98 °
Groveland, Wednesday, 19 August
Overcast. High 98°, low 72°.
Pressure29.85 inHg
Wind16.1 mph S
Humidity58%
Visibility—
Dew point71°
Thu, 20100° / 76°0
100 °
Groveland, Thursday, 20 August
Overcast. High 100°, low 76°.
Pressure29.77 inHg
Wind10.7 mph W
Humidity38%
Visibility—
Dew point65°
Fri, 2190° / 74°0
90 °
Groveland, Friday, 21 August
Mostly clear. High 90°, low 74°.
Pressure29.88 inHg
Wind11.2 mph NE
Humidity66%
Visibility—
Dew point73°
Sat, 22103° / 71°0.17
103 °
Groveland, Saturday, 22 August
Rain. High 103°, low 71°.
Pressure29.83 inHg
Wind25.4 mph S
Humidity39%
Visibility—
Dew point66°
Sun, 2397° / 74°0.02
97 °
Groveland, Sunday, 23 August
Light rain. High 97°, low 74°.
Pressure29.83 inHg
Wind15.1 mph S
Humidity39%
Visibility—
Dew point65°
Mon, 2482° / 68°0.16
82 °
Groveland, Monday, 24 August
Light rain. High 82°, low 68°.
Pressure30.00 inHg
Wind13.8 mph E
Humidity72%
Visibility—
Dew point70°
From day 17 onward the outlook is built from 60-year climate statistics
Tue, 2582° / 65°0.1
82 °
Groveland, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high82°
Average low65°
Average precipitation0.1 in
Chance of precipitation33%
Record high94° (2014)
Record low54° (1966)
Wed, 2682° / 66°0.14
82 °
Groveland, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high82°
Average low66°
Average precipitation0.14 in
Chance of precipitation35%
Record high92° (2003)
Record low53° (1964)
Thu, 2782° / 66°0.09
82 °
Groveland, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high82°
Average low66°
Average precipitation0.09 in
Chance of precipitation23%
Record high94° (2024)
Record low54° (1968)
Fri, 2882° / 65°0.12
82 °
Groveland, Friday, 28 August
Climate normal for this date — 60-year average.
Average high82°
Average low65°
Average precipitation0.12 in
Chance of precipitation27%
Record high93° (2013)
Record low49° (1986)
Sat, 2982° / 65°0.11
82 °
Groveland, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high82°
Average low65°
Average precipitation0.11 in
Chance of precipitation35%
Record high94° (1984)
Record low47° (1986)
Sun, 3081° / 65°0.06
81 °
Groveland, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high81°
Average low65°
Average precipitation0.06 in
Chance of precipitation28%
Record high96° (2013)
Record low52° (1986)
Mon, 3180° / 64°0.08
80 °
Groveland, Monday, 31 August
Climate normal for this date — 60-year average.
Average high80°
Average low64°
Average precipitation0.08 in
Chance of precipitation23%
Record high92° (2011)
Record low50° (2009)
Tue, 0180° / 64°0.17
80 °
Groveland, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high80°
Average low64°
Average precipitation0.17 in
Chance of precipitation28%
Record high98° (2011)
Record low48° (1967)
Wed, 0280° / 64°0.06
80 °
Groveland, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high80°
Average low64°
Average precipitation0.06 in
Chance of precipitation22%
Record high95° (2011)
Record low49° (1967)
Thu, 0380° / 64°0.09
80 °
Groveland, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high80°
Average low64°
Average precipitation0.09 in
Chance of precipitation28%
Record high92° (1964)
Record low47° (1974)
Fri, 0479° / 62°0.11
79 °
Groveland, Friday, 4 September
Climate normal for this date — 60-year average.
Average high79°
Average low62°
Average precipitation0.11 in
Chance of precipitation32%
Record high91° (2007)
Record low44° (1974)
Sat, 0579° / 62°0.04
79 °
Groveland, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high79°
Average low62°
Average precipitation0.04 in
Chance of precipitation17%
Record high92° (1990)
Record low50° (1974)
Sun, 0678° / 62°0.1
78 °
Groveland, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high78°
Average low62°
Average precipitation0.1 in
Chance of precipitation33%
Record high92° (2015)
Record low46° (1962)
Mon, 0779° / 62°0.11
79 °
Groveland, Monday, 7 September
Climate normal for this date — 60-year average.
Average high79°
Average low62°
Average precipitation0.11 in
Chance of precipitation28%
Record high92° (1960)
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 Groveland, 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 Groveland, 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.