Monthly outlook for Sulphur Springs, MI: average high 76.4°, average low 65.1°. That is 0.2° below the climate normal for August. Precipitation is expected on 9 days (about 5.4 inches), against a normal of 6 days and 2.2 inches. The warmest day looks like 10 August (83.4°), the coolest 22 August (58.5°).
76.4°/65.1°
Average high / low
−0.2°
Below normal
9 / 6
Wet days / normal
5.4 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
9 August – 18 August
77.5°
76.9°
+0.3°
19 August – 28 August
74.5°
76.6°
-1.2°
29 August – 7 September
at normal
75.1°
—
August records over 66 years
90.7°9 August 2025All-time high
46.8°29 August 2025All-time low
Climate normals and records are computed from the nearest reference point — South Haven (2 mi).
Mon, 1083° / 65°2.33
83 °
Sulphur Springs, Monday, 10 August
Heavy rain. High 83°, low 65°.
Pressure29.91 inHg
Wind7.1 mph W
Humidity93%
Visibility6.2 mi
Dew point72°
Tue, 1178° / 69°0.43
78 °
Sulphur Springs, Tuesday, 11 August
Heavy rain. High 78°, low 69°.
Pressure29.85 inHg
Wind12.8 mph S
Humidity73%
Visibility6.2 mi
Dew point69°
Wed, 1273° / 65°0
73 °
Sulphur Springs, Wednesday, 12 August
Overcast. High 73°, low 65°.
Pressure29.88 inHg
Wind6.9 mph NW
Humidity79%
Visibility6.2 mi
Dew point65°
Thu, 1379° / 63°0
79 °
Sulphur Springs, Thursday, 13 August
Overcast. High 79°, low 63°.
Pressure30.00 inHg
Wind7.2 mph SE
Humidity62%
Visibility6.2 mi
Dew point61°
Fri, 1478° / 65°0.14
78 °
Sulphur Springs, Friday, 14 August
Rain. High 78°, low 65°.
Pressure30.06 inHg
Wind11.5 mph E
Humidity67%
Visibility—
Dew point65°
Sat, 1580° / 65°0.9
80 °
Sulphur Springs, Saturday, 15 August
Heavy rain. High 80°, low 65°.
Pressure29.97 inHg
Wind18.4 mph SE
Humidity91%
Visibility—
Dew point70°
Sun, 1676° / 67°0.01
76 °
Sulphur Springs, Sunday, 16 August
Light rain. High 76°, low 67°.
Pressure29.94 inHg
Wind21.3 mph NW
Humidity79%
Visibility—
Dew point63°
Mon, 1772° / 62°0.12
72 °
Sulphur Springs, Monday, 17 August
Light rain. High 72°, low 62°.
Pressure30.06 inHg
Wind12.2 mph SE
Humidity69%
Visibility—
Dew point60°
Tue, 1875° / 69°0.15
75 °
Sulphur Springs, Tuesday, 18 August
Light rain. High 75°, low 69°.
Pressure29.83 inHg
Wind17.6 mph SE
Humidity87%
Visibility—
Dew point70°
Wed, 1974° / 65°0.02
74 °
Sulphur Springs, Wednesday, 19 August
Light rain. High 74°, low 65°.
Pressure30.06 inHg
Wind11.8 mph NW
Humidity64%
Visibility—
Dew point60°
Thu, 2076° / 69°0
76 °
Sulphur Springs, Thursday, 20 August
Light rain. High 76°, low 69°.
Pressure29.85 inHg
Wind9.6 mph SW
Humidity82%
Visibility—
Dew point69°
Fri, 2177° / 68°0.16
77 °
Sulphur Springs, Friday, 21 August
Light rain. High 77°, low 68°.
Pressure29.85 inHg
Wind15.5 mph N
Humidity73%
Visibility—
Dew point67°
Sat, 2272° / 58°0
72 °
Sulphur Springs, Saturday, 22 August
Clear. High 72°, low 58°.
Pressure30.03 inHg
Wind9.9 mph NE
Humidity53%
Visibility—
Dew point52°
Sun, 2373° / 63°0
73 °
Sulphur Springs, Sunday, 23 August
Overcast. High 73°, low 63°.
Pressure30.00 inHg
Wind9.7 mph SW
Humidity70%
Visibility—
Dew point61°
Mon, 2475° / 68°0.11
75 °
Sulphur Springs, Monday, 24 August
Light rain. High 75°, low 68°.
Pressure30.03 inHg
Wind7.7 mph NW
Humidity85%
Visibility—
Dew point69°
From day 17 onward the outlook is built from 60-year climate statistics
Tue, 2577° / 67°0.11
77 °
Sulphur Springs, 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 °
Sulphur Springs, 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 °
Sulphur Springs, 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 °
Sulphur Springs, 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 °
Sulphur Springs, 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 °
Sulphur Springs, 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 °
Sulphur Springs, 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 °
Sulphur Springs, 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 °
Sulphur Springs, 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 °
Sulphur Springs, 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 °
Sulphur Springs, 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 °
Sulphur Springs, 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 °
Sulphur Springs, 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)
Mon, 0774° / 65°0.1
74 °
Sulphur Springs, Monday, 7 September
Climate normal for this date — 60-year average.
Average high74°
Average low65°
Average precipitation0.1 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 Sulphur Springs, 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 Sulphur Springs, 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.