Monthly outlook for South Haven, MI: average high 74.2°, average low 62.7°. That is 1.5° below the climate normal for August. Precipitation is expected on 3 days (about 3.3 inches), against a normal of 6 days and 2.2 inches. The warmest day looks like 9 August (84.3°), the coolest 21 August (55.2°).
74.2°/62.7°
Average high / low
−1.5°
Below normal
3 / 6
Wet days / normal
3.3 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
8 August – 17 August
75.8°
77.1°
-0.7°
18 August – 27 August
71.5°
76.7°
-2.9°
28 August – 6 September
at normal
75.4°
—
August records over 66 years
90.7°9 August 2025All-time high
46.8°29 August 2025All-time low
Sun, 0984° / 63°1.52
84 °
South Haven, Sunday, 9 August
Heavy rain. High 84°, low 63°.
Pressure29.97 inHg
Wind12.9 mph SW
Humidity49%
Visibility6.2 mi
Dew point59°
Mon, 1082° / 70°0.58
82 °
South Haven, Monday, 10 August
Rain. High 82°, low 70°.
Pressure29.94 inHg
Wind8.8 mph SW
Humidity90%
Visibility6.2 mi
Dew point71°
Tue, 1176° / 66°1.13
76 °
South Haven, Tuesday, 11 August
Heavy rain. High 76°, low 66°.
Pressure29.77 inHg
Wind1.7 mph SE
Humidity92%
Visibility6.2 mi
Dew point63°
Wed, 1274° / 66°0
74 °
South Haven, Wednesday, 12 August
Overcast. High 74°, low 66°.
Pressure29.83 inHg
Wind6.8 mph NW
Humidity78%
Visibility6.2 mi
Dew point65°
Thu, 1368° / 58°0
68 °
South Haven, Thursday, 13 August
Overcast. High 68°, low 58°.
Pressure30.03 inHg
Wind11.7 mph NE
Humidity54%
Visibility—
Dew point50°
Fri, 1471° / 60°0
71 °
South Haven, Friday, 14 August
Clear. High 71°, low 60°.
Pressure30.12 inHg
Wind9.4 mph NW
Humidity68%
Visibility—
Dew point59°
Sat, 1574° / 59°0
74 °
South Haven, Saturday, 15 August
Overcast. High 74°, low 59°.
Pressure30.27 inHg
Wind8.9 mph NE
Humidity49%
Visibility—
Dew point52°
Sun, 1673° / 61°0
73 °
South Haven, Sunday, 16 August
Overcast. High 73°, low 61°.
Pressure30.12 inHg
Wind8 mph W
Humidity68%
Visibility—
Dew point60°
Mon, 1773° / 66°0
73 °
South Haven, Monday, 17 August
Mostly clear. High 73°, low 66°.
Pressure30.06 inHg
Wind8.8 mph W
Humidity73%
Visibility—
Dew point63°
Tue, 1877° / 65°0
77 °
South Haven, Tuesday, 18 August
Overcast. High 77°, low 65°.
Pressure29.97 inHg
Wind13.4 mph SW
Humidity76%
Visibility—
Dew point66°
Wed, 1972° / 66°0.04
72 °
South Haven, Wednesday, 19 August
Light rain. High 72°, low 66°.
Pressure29.88 inHg
Wind23.2 mph N
Humidity78%
Visibility—
Dew point61°
Thu, 2067° / 64°0.02
67 °
South Haven, Thursday, 20 August
Light rain. High 67°, low 64°.
Pressure30.03 inHg
Wind25.4 mph N
Humidity62%
Visibility—
Dew point54°
Fri, 2169° / 55°0
69 °
South Haven, Friday, 21 August
Clear. High 69°, low 55°.
Pressure30.09 inHg
Wind10.2 mph NW
Humidity51%
Visibility—
Dew point48°
Sat, 2268° / 57°0.03
68 °
South Haven, Saturday, 22 August
Light rain. High 68°, low 57°.
Pressure29.97 inHg
Wind17.9 mph SE
Humidity61%
Visibility—
Dew point52°
Sun, 2375° / 67°0
75 °
South Haven, Sunday, 23 August
Partly cloudy. High 75°, low 67°.
Pressure29.88 inHg
Wind20.6 mph W
Humidity66%
Visibility—
Dew point62°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 2477° / 67°0.15
77 °
South Haven, Monday, 24 August
Climate normal for this date — 60-year average.
Average high77°
Average low67°
Average precipitation0.15 in
Chance of precipitation37%
Record high87° (2021)
Record low56° (2017)
Tue, 2577° / 67°0.11
77 °
South Haven, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high77°
Average low67°
Average precipitation0.11 in
Chance of precipitation30%
Record high87° (2024)
Record low51° (2017)
Wed, 2677° / 68°0.12
77 °
South Haven, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high77°
Average low68°
Average precipitation0.12 in
Chance of precipitation32%
Record high91° (2024)
Record low54° (2025)
Thu, 2777° / 68°0.14
77 °
South Haven, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high77°
Average low68°
Average precipitation0.14 in
Chance of precipitation42%
Record high90° (2024)
Record low52° (2025)
Fri, 2876° / 67°0.18
76 °
South Haven, Friday, 28 August
Climate normal for this date — 60-year average.
Average high76°
Average low67°
Average precipitation0.18 in
Chance of precipitation37%
Record high90° (2021)
Record low53° (2023)
Sat, 2976° / 67°0.12
76 °
South Haven, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high76°
Average low67°
Average precipitation0.12 in
Chance of precipitation38%
Record high86° (2021)
Record low47° (2025)
Sun, 3076° / 67°0.07
76 °
South Haven, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high76°
Average low67°
Average precipitation0.07 in
Chance of precipitation22%
Record high85° (2010)
Record low48° (2025)
Mon, 3176° / 65°0.09
76 °
South Haven, Monday, 31 August
Climate normal for this date — 60-year average.
Average high76°
Average low65°
Average precipitation0.09 in
Chance of precipitation22%
Record high84° (1973)
Record low50° (2025)
Tue, 0176° / 66°0.13
76 °
South Haven, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high76°
Average low66°
Average precipitation0.13 in
Chance of precipitation30%
Record high86° (2011)
Record low51° (2017)
Wed, 0276° / 66°0.07
76 °
South Haven, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high76°
Average low66°
Average precipitation0.07 in
Chance of precipitation28%
Record high85° (2008)
Record low49° (2017)
Thu, 0375° / 66°0.08
75 °
South Haven, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high75°
Average low66°
Average precipitation0.08 in
Chance of precipitation27%
Record high86° (1973)
Record low54° (2024)
Fri, 0474° / 65°0.08
74 °
South Haven, Friday, 4 September
Climate normal for this date — 60-year average.
Average high74°
Average low65°
Average precipitation0.08 in
Chance of precipitation32%
Record high87° (2018)
Record low51° (2025)
Sat, 0574° / 65°0.09
74 °
South Haven, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high74°
Average low65°
Average precipitation0.09 in
Chance of precipitation22%
Record high89° (2023)
Record low51° (2019)
Sun, 0674° / 65°0.1
74 °
South Haven, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high74°
Average low65°
Average precipitation0.1 in
Chance of precipitation38%
Record high85° (1960)
Record low51° (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 South Haven, 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 South Haven, 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.