Monthly outlook for McHarg, MI: average high 77.2°, average low 56.1°. That is 1.8° above the climate normal for August. Precipitation is expected on 5 days (about 0.4 inches), against a normal of 6 days and 1.9 inches. The warmest day looks like 18 August (88.3°), the coolest 14 August (47.8°).
77.2°/56.1°
Average high / low
+1.8°
Above normal
5 / 6
Wet days / normal
0.4 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
8 August – 17 August
77.8°
74.5°
+1.8°
18 August – 27 August
76.3°
73.1°
+1.7°
28 August – 6 September
at normal
71.8°
—
August records over 66 years
92.5°8 August 2001All-time high
48°29 August 1982All-time low
Climate normals and records are computed from the nearest reference point — Alpena (9 mi).
Sun, 0983° / 62°0.02
83 °
McHarg, Sunday, 9 August
Light rain. High 83°, low 62°.
Pressure29.94 inHg
Wind7.3 mph SW
Humidity36%
Visibility6.2 mi
Dew point52°
Mon, 1083° / 62°0.05
83 °
McHarg, Monday, 10 August
Light rain. High 83°, low 62°.
Pressure29.88 inHg
Wind8 mph W
Humidity77%
Visibility6.2 mi
Dew point67°
Tue, 1174° / 57°0
74 °
McHarg, Tuesday, 11 August
Overcast. High 74°, low 57°.
Pressure29.88 inHg
Wind7.8 mph E
Humidity45%
Visibility6.2 mi
Dew point52°
Wed, 1280° / 57°0.05
80 °
McHarg, Wednesday, 12 August
Light rain. High 80°, low 57°.
Pressure29.77 inHg
Wind2.4 mph W
Humidity49%
Visibility6.2 mi
Dew point52°
Thu, 1369° / 50°0
69 °
McHarg, Thursday, 13 August
Overcast. High 69°, low 50°.
Pressure29.97 inHg
Wind13 mph NW
Humidity45%
Visibility—
Dew point45°
Fri, 1470° / 48°0.01
70 °
McHarg, Friday, 14 August
Light rain. High 70°, low 48°.
Pressure30.03 inHg
Wind7.2 mph NE
Humidity52%
Visibility—
Dew point49°
Sat, 1575° / 51°0
75 °
McHarg, Saturday, 15 August
Overcast. High 75°, low 51°.
Pressure30.27 inHg
Wind8.3 mph E
Humidity44%
Visibility—
Dew point49°
Sun, 1681° / 53°0
81 °
McHarg, Sunday, 16 August
Partly cloudy. High 81°, low 53°.
Pressure30.09 inHg
Wind6.8 mph SE
Humidity30%
Visibility—
Dew point43°
Mon, 1784° / 61°0
84 °
McHarg, Monday, 17 August
Overcast. High 84°, low 61°.
Pressure29.94 inHg
Wind7.3 mph N
Humidity38%
Visibility—
Dew point53°
Tue, 1888° / 57°0.02
88 °
McHarg, Tuesday, 18 August
Light rain. High 88°, low 57°.
Pressure29.88 inHg
Wind13.2 mph SW
Humidity37%
Visibility—
Dew point54°
Wed, 1970° / 58°0.14
70 °
McHarg, Wednesday, 19 August
Light rain. High 70°, low 58°.
Pressure29.68 inHg
Wind15.8 mph W
Humidity67%
Visibility—
Dew point58°
Thu, 2071° / 57°0
71 °
McHarg, Thursday, 20 August
Partly cloudy. High 71°, low 57°.
Pressure29.91 inHg
Wind14.8 mph NW
Humidity31%
Visibility—
Dew point37°
Fri, 2174° / 50°0
74 °
McHarg, Friday, 21 August
Clear. High 74°, low 50°.
Pressure30.06 inHg
Wind9 mph N
Humidity37%
Visibility—
Dew point43°
Sat, 2275° / 51°0
75 °
McHarg, Saturday, 22 August
Overcast. High 75°, low 51°.
Pressure29.97 inHg
Wind9.1 mph SE
Humidity36%
Visibility—
Dew point44°
Sun, 2379° / 60°0.11
79 °
McHarg, Sunday, 23 August
Light rain. High 79°, low 60°.
Pressure29.68 inHg
Wind15.9 mph W
Humidity38%
Visibility—
Dew point49°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 2473° / 63°0.09
73 °
McHarg, Monday, 24 August
Climate normal for this date — 60-year average.
Average high73°
Average low63°
Average precipitation0.09 in
Chance of precipitation30%
Record high86° (2020)
Record low51° (1971)
Tue, 2573° / 63°0.07
73 °
McHarg, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high73°
Average low63°
Average precipitation0.07 in
Chance of precipitation28%
Record high85° (2021)
Record low53° (1977)
Wed, 2673° / 64°0.15
73 °
McHarg, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high73°
Average low64°
Average precipitation0.15 in
Chance of precipitation43%
Record high85° (1991)
Record low51° (2025)
Thu, 2774° / 64°0.15
74 °
McHarg, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high74°
Average low64°
Average precipitation0.15 in
Chance of precipitation52%
Record high88° (1973)
Record low49° (2025)
Fri, 2873° / 64°0.12
73 °
McHarg, Friday, 28 August
Climate normal for this date — 60-year average.
Average high73°
Average low64°
Average precipitation0.12 in
Chance of precipitation38%
Record high86° (1973)
Record low49° (1965)
Sat, 2973° / 63°0.13
73 °
McHarg, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high73°
Average low63°
Average precipitation0.13 in
Chance of precipitation47%
Record high88° (1973)
Record low48° (1982)
Sun, 3073° / 62°0.11
73 °
McHarg, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high73°
Average low62°
Average precipitation0.11 in
Chance of precipitation37%
Record high86° (2010)
Record low49° (2025)
Mon, 3172° / 61°0.05
72 °
McHarg, Monday, 31 August
Climate normal for this date — 60-year average.
Average high72°
Average low61°
Average precipitation0.05 in
Chance of precipitation22%
Record high84° (2010)
Record low53° (2019)
Tue, 0172° / 62°0.06
72 °
McHarg, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high72°
Average low62°
Average precipitation0.06 in
Chance of precipitation25%
Record high82° (1973)
Record low53° (2017)
Wed, 0272° / 62°0.08
72 °
McHarg, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high72°
Average low62°
Average precipitation0.08 in
Chance of precipitation38%
Record high86° (2011)
Record low49° (2017)
Thu, 0372° / 61°0.11
72 °
McHarg, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high72°
Average low61°
Average precipitation0.11 in
Chance of precipitation37%
Record high86° (2023)
Record low52° (1987)
Fri, 0471° / 61°0.09
71 °
McHarg, Friday, 4 September
Climate normal for this date — 60-year average.
Average high71°
Average low61°
Average precipitation0.09 in
Chance of precipitation30%
Record high84° (2023)
Record low47° (2025)
Sat, 0571° / 61°0.11
71 °
McHarg, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high71°
Average low61°
Average precipitation0.11 in
Chance of precipitation37%
Record high85° (2023)
Record low50° (2019)
Sun, 0671° / 61°0.07
71 °
McHarg, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high71°
Average low61°
Average precipitation0.07 in
Chance of precipitation35%
Record high82° (1960)
Record low49° (2017)
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 McHarg, 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 McHarg, 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.