Monthly outlook for Sugar Grove, MI: average high 79.4°, average low 60.7°. That is 2.6° above the climate normal for August. Precipitation is expected on 5 days (about 0.7 inches), against a normal of 5 days and 1.9 inches. The warmest day looks like 20 August (90.1°), the coolest 15 August (50.1°).
79.4°/60.7°
Average high / low
+2.6°
Above normal
5 / 5
Wet days / normal
0.7 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
9 August – 18 August
76.7°
75°
+0.9°
19 August – 28 August
84°
74.6°
+5.2°
29 August – 7 September
at normal
73°
—
August records over 66 years
88.5°16 August 1988All-time high
49.5°29 August 2025All-time low
Climate normals and records are computed from the nearest reference point — Ludington (9 mi).
Mon, 1083° / 66°0.18
83 °
Sugar Grove, Monday, 10 August
Rain. High 83°, low 66°.
Pressure29.88 inHg
Wind6.4 mph NW
Humidity64%
Visibility6.2 mi
Dew point65°
Tue, 1178° / 62°0.1
78 °
Sugar Grove, Tuesday, 11 August
Rain. High 78°, low 62°.
Pressure29.91 inHg
Wind9.1 mph SW
Humidity62%
Visibility6.0 mi
Dew point60°
Wed, 1278° / 62°0
78 °
Sugar Grove, Wednesday, 12 August
Clear. High 78°, low 62°.
Pressure29.80 inHg
Wind8.7 mph NW
Humidity56%
Visibility6.2 mi
Dew point62°
Thu, 1370° / 54°0
70 °
Sugar Grove, Thursday, 13 August
Overcast. High 70°, low 54°.
Pressure30.03 inHg
Wind12.7 mph NW
Humidity44%
Visibility—
Dew point46°
Fri, 1471° / 52°0
71 °
Sugar Grove, Friday, 14 August
Partly cloudy. High 71°, low 52°.
Pressure30.18 inHg
Wind13 mph NW
Humidity43%
Visibility—
Dew point45°
Sat, 1578° / 50°0
78 °
Sugar Grove, Saturday, 15 August
Overcast. High 78°, low 50°.
Pressure30.27 inHg
Wind8.8 mph W
Humidity32%
Visibility—
Dew point42°
Sun, 1669° / 61°0.13
69 °
Sugar Grove, Sunday, 16 August
Light rain. High 69°, low 61°.
Pressure30.12 inHg
Wind8.1 mph SW
Humidity82%
Visibility—
Dew point61°
Mon, 1778° / 61°0
78 °
Sugar Grove, Monday, 17 August
Mostly clear. High 78°, low 61°.
Pressure30.06 inHg
Wind11.5 mph NW
Humidity43%
Visibility—
Dew point52°
Tue, 1881° / 55°0
81 °
Sugar Grove, Tuesday, 18 August
Overcast. High 81°, low 55°.
Pressure30.03 inHg
Wind8 mph W
Humidity39%
Visibility—
Dew point51°
Wed, 1987° / 61°0
87 °
Sugar Grove, Wednesday, 19 August
Overcast. High 87°, low 61°.
Pressure29.94 inHg
Wind10.9 mph SW
Humidity55%
Visibility—
Dew point61°
Thu, 2090° / 69°0
90 °
Sugar Grove, Thursday, 20 August
Overcast. High 90°, low 69°.
Pressure29.77 inHg
Wind15.4 mph W
Humidity52%
Visibility—
Dew point68°
Fri, 2184° / 66°0.01
84 °
Sugar Grove, Friday, 21 August
Light rain. High 84°, low 66°.
Pressure29.94 inHg
Wind12.7 mph N
Humidity43%
Visibility—
Dew point57°
Sat, 2290° / 62°0.02
90 °
Sugar Grove, Saturday, 22 August
Light rain. High 90°, low 62°.
Pressure29.88 inHg
Wind9.1 mph W
Humidity35%
Visibility—
Dew point55°
Sun, 2379° / 64°0.08
79 °
Sugar Grove, Sunday, 23 August
Light rain. High 79°, low 64°.
Pressure29.85 inHg
Wind12.4 mph NE
Humidity61%
Visibility—
Dew point62°
Mon, 2475° / 61°0.01
75 °
Sugar Grove, Monday, 24 August
Light rain. High 75°, low 61°.
Pressure30.03 inHg
Wind8.1 mph NW
Humidity50%
Visibility—
Dew point53°
From day 17 onward the outlook is built from 60-year climate statistics
Tue, 2575° / 65°0.09
75 °
Sugar Grove, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high75°
Average low65°
Average precipitation0.09 in
Chance of precipitation25%
Record high85° (2012)
Record low50° (2017)
Wed, 2675° / 65°0.15
75 °
Sugar Grove, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high75°
Average low65°
Average precipitation0.15 in
Chance of precipitation38%
Record high83° (1973)
Record low54° (2017)
Thu, 2775° / 65°0.15
75 °
Sugar Grove, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high75°
Average low65°
Average precipitation0.15 in
Chance of precipitation40%
Record high84° (1973)
Record low55° (2023)
Fri, 2874° / 64°0.11
74 °
Sugar Grove, Friday, 28 August
Climate normal for this date — 60-year average.
Average high74°
Average low64°
Average precipitation0.11 in
Chance of precipitation35%
Record high85° (1991)
Record low51° (1965)
Sat, 2974° / 64°0.14
74 °
Sugar Grove, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high74°
Average low64°
Average precipitation0.14 in
Chance of precipitation42%
Record high85° (1991)
Record low49° (2025)
Sun, 3074° / 64°0.1
74 °
Sugar Grove, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high74°
Average low64°
Average precipitation0.1 in
Chance of precipitation28%
Record high84° (2010)
Record low50° (2025)
Mon, 3174° / 62°0.08
74 °
Sugar Grove, Monday, 31 August
Climate normal for this date — 60-year average.
Average high74°
Average low62°
Average precipitation0.08 in
Chance of precipitation25%
Record high82° (2010)
Record low50° (2009)
Tue, 0173° / 62°0.07
73 °
Sugar Grove, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high73°
Average low62°
Average precipitation0.07 in
Chance of precipitation23%
Record high85° (2011)
Record low50° (2009)
Wed, 0273° / 63°0.09
73 °
Sugar Grove, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high73°
Average low63°
Average precipitation0.09 in
Chance of precipitation28%
Record high84° (2011)
Record low50° (2017)
Thu, 0373° / 63°0.13
73 °
Sugar Grove, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high73°
Average low63°
Average precipitation0.13 in
Chance of precipitation35%
Record high84° (2012)
Record low51° (1974)
Fri, 0472° / 62°0.09
72 °
Sugar Grove, Friday, 4 September
Climate normal for this date — 60-year average.
Average high72°
Average low62°
Average precipitation0.09 in
Chance of precipitation37%
Record high84° (1999)
Record low51° (1997)
Sat, 0572° / 62°0.11
72 °
Sugar Grove, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high72°
Average low62°
Average precipitation0.11 in
Chance of precipitation28%
Record high84° (1999)
Record low49° (2019)
Sun, 0672° / 62°0.11
72 °
Sugar Grove, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high72°
Average low62°
Average precipitation0.11 in
Chance of precipitation38%
Record high81° (1990)
Record low50° (1962)
Mon, 0772° / 61°0.11
72 °
Sugar Grove, Monday, 7 September
Climate normal for this date — 60-year average.
Average high72°
Average low61°
Average precipitation0.11 in
Chance of precipitation38%
Record high82° (1960)
Record low49° (1986)
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 Sugar Grove, MI 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 Sugar Grove, MI 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.