Monthly outlook for Old Saugatuck, MI: average high 76.9°, average low 64.7°. That is 0.1° below the climate normal for August. Precipitation is expected on 5 days (about 2.1 inches), against a normal of 6 days and 2.2 inches. The warmest day looks like 10 August (86.7°), the coolest 15 August (56.3°).
76.9°/64.7°
Average high / low
−0.1°
Below normal
5 / 6
Wet days / normal
2.1 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
9 August – 18 August
74.9°
77.3°
-1.3°
19 August – 28 August
80.1°
77°
+1.8°
29 August – 7 September
at normal
75.3°
—
August records over 66 years
90.5°4 August 2012All-time high
47.7°29 August 2025All-time low
Climate normals and records are computed from the nearest reference point — Fennville (7 mi).
Mon, 1087° / 70°0.4
87 °
Old Saugatuck, Monday, 10 August
Rain. High 87°, low 70°.
Pressure29.91 inHg
Wind6.5 mph W
Humidity86%
Visibility6.2 mi
Dew point71°
Tue, 1178° / 66°1.17
78 °
Old Saugatuck, Tuesday, 11 August
Heavy rain. High 78°, low 66°.
Pressure29.85 inHg
Wind14 mph NW
Humidity77%
Visibility5.8 mi
Dew point67°
Wed, 1273° / 66°0
73 °
Old Saugatuck, Wednesday, 12 August
Partly cloudy. High 73°, low 66°.
Pressure29.83 inHg
Wind9.4 mph NW
Humidity77%
Visibility6.2 mi
Dew point65°
Thu, 1368° / 60°0
68 °
Old Saugatuck, Thursday, 13 August
Overcast. High 68°, low 60°.
Pressure30.03 inHg
Wind17 mph NW
Humidity56%
Visibility—
Dew point51°
Fri, 1469° / 57°0
69 °
Old Saugatuck, Friday, 14 August
Mostly clear. High 69°, low 57°.
Pressure30.18 inHg
Wind13.3 mph NW
Humidity56%
Visibility—
Dew point51°
Sat, 1574° / 56°0
74 °
Old Saugatuck, Saturday, 15 August
Overcast. High 74°, low 56°.
Pressure30.27 inHg
Wind12.5 mph NE
Humidity53%
Visibility—
Dew point54°
Sun, 1670° / 63°0.07
70 °
Old Saugatuck, Sunday, 16 August
Light rain. High 70°, low 63°.
Pressure30.12 inHg
Wind11.9 mph S
Humidity65%
Visibility—
Dew point57°
Mon, 1773° / 65°0
73 °
Old Saugatuck, Monday, 17 August
Overcast. High 73°, low 65°.
Pressure30.06 inHg
Wind12.7 mph NW
Humidity64%
Visibility—
Dew point60°
Tue, 1873° / 61°0
73 °
Old Saugatuck, Tuesday, 18 August
Overcast. High 73°, low 61°.
Pressure30.03 inHg
Wind9.7 mph SW
Humidity62%
Visibility—
Dew point57°
Wed, 1980° / 66°0.08
80 °
Old Saugatuck, Wednesday, 19 August
Light rain. High 80°, low 66°.
Pressure29.97 inHg
Wind14.1 mph SE
Humidity80%
Visibility—
Dew point65°
Thu, 2080° / 72°0
80 °
Old Saugatuck, Thursday, 20 August
Overcast. High 80°, low 72°.
Pressure29.80 inHg
Wind11.9 mph SE
Humidity71%
Visibility—
Dew point69°
Fri, 2180° / 71°0
80 °
Old Saugatuck, Friday, 21 August
Clear. High 80°, low 71°.
Pressure29.91 inHg
Wind16 mph NW
Humidity59%
Visibility—
Dew point63°
Sat, 2285° / 67°0.01
85 °
Old Saugatuck, Saturday, 22 August
Light rain. High 85°, low 67°.
Pressure29.91 inHg
Wind13.9 mph E
Humidity56%
Visibility—
Dew point64°
Sun, 2378° / 69°0.01
78 °
Old Saugatuck, Sunday, 23 August
Light rain. High 78°, low 69°.
Pressure29.83 inHg
Wind19.4 mph E
Humidity75%
Visibility—
Dew point69°
Mon, 2478° / 65°0.01
78 °
Old Saugatuck, Monday, 24 August
Light rain. High 78°, low 65°.
Pressure30.06 inHg
Wind17.2 mph E
Humidity69%
Visibility—
Dew point65°
From day 17 onward the outlook is built from 60-year climate statistics
Tue, 2577° / 66°0.1
77 °
Old Saugatuck, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high77°
Average low66°
Average precipitation0.1 in
Chance of precipitation30%
Record high86° (2012)
Record low52° (2017)
Wed, 2678° / 66°0.1
78 °
Old Saugatuck, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high78°
Average low66°
Average precipitation0.1 in
Chance of precipitation32%
Record high89° (2024)
Record low54° (2017)
Thu, 2777° / 66°0.15
77 °
Old Saugatuck, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high77°
Average low66°
Average precipitation0.15 in
Chance of precipitation43%
Record high88° (2024)
Record low52° (2025)
Fri, 2877° / 66°0.19
77 °
Old Saugatuck, Friday, 28 August
Climate normal for this date — 60-year average.
Average high77°
Average low66°
Average precipitation0.19 in
Chance of precipitation40%
Record high87° (2021)
Record low51° (1986)
Sat, 2976° / 65°0.14
76 °
Old Saugatuck, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high76°
Average low65°
Average precipitation0.14 in
Chance of precipitation40%
Record high87° (1984)
Record low48° (2025)
Sun, 3076° / 65°0.07
76 °
Old Saugatuck, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high76°
Average low65°
Average precipitation0.07 in
Chance of precipitation23%
Record high86° (2010)
Record low48° (2025)
Mon, 3176° / 64°0.09
76 °
Old Saugatuck, Monday, 31 August
Climate normal for this date — 60-year average.
Average high76°
Average low64°
Average precipitation0.09 in
Chance of precipitation18%
Record high86° (2010)
Record low50° (2025)
Tue, 0176° / 64°0.13
76 °
Old Saugatuck, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high76°
Average low64°
Average precipitation0.13 in
Chance of precipitation30%
Record high88° (2011)
Record low51° (2017)
Wed, 0276° / 64°0.09
76 °
Old Saugatuck, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high76°
Average low64°
Average precipitation0.09 in
Chance of precipitation27%
Record high87° (2008)
Record low48° (2017)
Thu, 0376° / 64°0.08
76 °
Old Saugatuck, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high76°
Average low64°
Average precipitation0.08 in
Chance of precipitation27%
Record high87° (1973)
Record low50° (1974)
Fri, 0474° / 63°0.07
74 °
Old Saugatuck, Friday, 4 September
Climate normal for this date — 60-year average.
Average high74°
Average low63°
Average precipitation0.07 in
Chance of precipitation30%
Record high87° (1999)
Record low51° (2025)
Sat, 0575° / 63°0.08
75 °
Old Saugatuck, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high75°
Average low63°
Average precipitation0.08 in
Chance of precipitation23%
Record high88° (2023)
Record low52° (2019)
Sun, 0674° / 63°0.11
74 °
Old Saugatuck, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high74°
Average low63°
Average precipitation0.11 in
Chance of precipitation35%
Record high86° (1990)
Record low51° (2011)
Mon, 0774° / 63°0.12
74 °
Old Saugatuck, Monday, 7 September
Climate normal for this date — 60-year average.
Average high74°
Average low63°
Average precipitation0.12 in
Chance of precipitation32%
Record high87° (1960)
Record low48° (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 Old Saugatuck, 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 Old Saugatuck, 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.