Monthly outlook for Donnelly, MI: average high 75.2°, average low 54.5°. That is 0.3° above the climate normal for August. Precipitation is expected on 4 days (about 0.4 inches), against a normal of 5 days and 1.7 inches. The warmest day looks like 18 August (85.2°), the coolest 21 August (47.5°).
75.2°/54.5°
Average high / low
+0.3°
Above normal
4 / 5
Wet days / normal
0.4 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
9 August – 18 August
77.6°
75°
+1.4°
19 August – 28 August
71.2°
74.2°
-1.7°
29 August – 7 September
at normal
72.3°
—
August records over 66 years
95°2 August 1988All-time high
41.5°29 August 1982All-time low
Climate normals and records are computed from the nearest reference point — Lewiston (8 mi).
Mon, 1082° / 63°0.01
82 °
Donnelly, Monday, 10 August
Light rain. High 82°, low 63°.
Pressure29.88 inHg
Wind9 mph NW
Humidity57%
Visibility6.2 mi
Dew point61°
Tue, 1177° / 57°0
77 °
Donnelly, Tuesday, 11 August
Overcast. High 77°, low 57°.
Pressure29.85 inHg
Wind7 mph E
Humidity43%
Visibility6.2 mi
Dew point51°
Wed, 1275° / 56°0
75 °
Donnelly, Wednesday, 12 August
Mostly clear. High 75°, low 56°.
Pressure29.77 inHg
Wind7.3 mph NW
Humidity41%
Visibility6.2 mi
Dew point51°
Thu, 1368° / 48°0
68 °
Donnelly, Thursday, 13 August
Overcast. High 68°, low 48°.
Pressure29.97 inHg
Wind10.8 mph NW
Humidity43%
Visibility—
Dew point42°
Fri, 1472° / 49°0
72 °
Donnelly, Friday, 14 August
Partly cloudy. High 72°, low 49°.
Pressure30.03 inHg
Wind9.9 mph NW
Humidity41%
Visibility—
Dew point45°
Sat, 1574° / 49°0
74 °
Donnelly, Saturday, 15 August
Overcast. High 74°, low 49°.
Pressure30.27 inHg
Wind3.4 mph SE
Humidity35%
Visibility—
Dew point42°
Sun, 1681° / 52°0
81 °
Donnelly, Sunday, 16 August
Partly cloudy. High 81°, low 52°.
Pressure30.09 inHg
Wind5.7 mph W
Humidity32%
Visibility—
Dew point45°
Mon, 1782° / 59°0.01
82 °
Donnelly, Monday, 17 August
Light rain. High 82°, low 59°.
Pressure29.97 inHg
Wind7.6 mph NW
Humidity41%
Visibility—
Dew point53°
Tue, 1885° / 58°0.11
85 °
Donnelly, Tuesday, 18 August
Light rain. High 85°, low 58°.
Pressure29.88 inHg
Wind12.1 mph SW
Humidity35%
Visibility—
Dew point51°
Wed, 1967° / 56°0.09
67 °
Donnelly, Wednesday, 19 August
Light rain. High 67°, low 56°.
Pressure29.71 inHg
Wind15.3 mph W
Humidity67%
Visibility—
Dew point55°
Thu, 2070° / 52°0
70 °
Donnelly, Thursday, 20 August
Partly cloudy. High 70°, low 52°.
Pressure29.94 inHg
Wind14.1 mph NW
Humidity30%
Visibility—
Dew point36°
Fri, 2173° / 48°0
73 °
Donnelly, Friday, 21 August
Clear. High 73°, low 48°.
Pressure30.09 inHg
Wind8.3 mph N
Humidity35%
Visibility—
Dew point41°
Sat, 2270° / 52°0
70 °
Donnelly, Saturday, 22 August
Overcast. High 70°, low 52°.
Pressure29.97 inHg
Wind9.6 mph S
Humidity38%
Visibility—
Dew point41°
Sun, 2374° / 56°0.13
74 °
Donnelly, Sunday, 23 August
Light rain. High 74°, low 56°.
Pressure29.71 inHg
Wind17.2 mph W
Humidity47%
Visibility—
Dew point51°
Mon, 2473° / 55°0
73 °
Donnelly, Monday, 24 August
Overcast. High 73°, low 55°.
Pressure30.00 inHg
Wind10.1 mph NW
Humidity41%
Visibility—
Dew point45°
From day 17 onward the outlook is built from 60-year climate statistics
Tue, 2575° / 58°0.1
75 °
Donnelly, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high75°
Average low58°
Average precipitation0.1 in
Chance of precipitation28%
Record high90° (2013)
Record low44° (1977)
Wed, 2675° / 59°0.16
75 °
Donnelly, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high75°
Average low59°
Average precipitation0.16 in
Chance of precipitation37%
Record high89° (2024)
Record low48° (1966)
Thu, 2774° / 59°0.2
74 °
Donnelly, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high74°
Average low59°
Average precipitation0.2 in
Chance of precipitation48%
Record high90° (1973)
Record low46° (2025)
Fri, 2874° / 58°0.09
74 °
Donnelly, Friday, 28 August
Climate normal for this date — 60-year average.
Average high74°
Average low58°
Average precipitation0.09 in
Chance of precipitation38%
Record high89° (1991)
Record low43° (1986)
Sat, 2973° / 57°0.13
73 °
Donnelly, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high73°
Average low57°
Average precipitation0.13 in
Chance of precipitation43%
Record high90° (1984)
Record low42° (1982)
Sun, 3073° / 57°0.09
73 °
Donnelly, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high73°
Average low57°
Average precipitation0.09 in
Chance of precipitation33%
Record high87° (2012)
Record low43° (1976)
Mon, 3173° / 56°0.05
73 °
Donnelly, Monday, 31 August
Climate normal for this date — 60-year average.
Average high73°
Average low56°
Average precipitation0.05 in
Chance of precipitation18%
Record high86° (1960)
Record low44° (2009)
Tue, 0173° / 56°0.06
73 °
Donnelly, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high73°
Average low56°
Average precipitation0.06 in
Chance of precipitation25%
Record high85° (2015)
Record low46° (1994)
Wed, 0273° / 56°0.08
73 °
Donnelly, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high73°
Average low56°
Average precipitation0.08 in
Chance of precipitation30%
Record high90° (2011)
Record low42° (1976)
Thu, 0373° / 56°0.12
73 °
Donnelly, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high73°
Average low56°
Average precipitation0.12 in
Chance of precipitation32%
Record high86° (2012)
Record low42° (1987)
Fri, 0472° / 55°0.09
72 °
Donnelly, Friday, 4 September
Climate normal for this date — 60-year average.
Average high72°
Average low55°
Average precipitation0.09 in
Chance of precipitation30%
Record high90° (2023)
Record low43° (2025)
Sat, 0572° / 56°0.09
72 °
Donnelly, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high72°
Average low56°
Average precipitation0.09 in
Chance of precipitation35%
Record high89° (2023)
Record low44° (1984)
Sun, 0672° / 56°0.07
72 °
Donnelly, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high72°
Average low56°
Average precipitation0.07 in
Chance of precipitation35%
Record high88° (1960)
Record low43° (1962)
Mon, 0770° / 55°0.08
70 °
Donnelly, Monday, 7 September
Climate normal for this date — 60-year average.
Average high70°
Average low55°
Average precipitation0.08 in
Chance of precipitation43%
Record high90° (1960)
Record low40° (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 Donnelly, 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 Donnelly, 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.