Monthly outlook for Harrisville, MI: average high 73.7°, average low 61.1°. That is 0° above the climate normal for August. Precipitation is expected on 4 days (about 0.9 inches), against a normal of 5 days and 1.8 inches. The warmest day looks like 20 August (85.8°), the coolest 14 August (51.8°).
73.7°/61.1°
Average high / low
+0°
Above normal
4 / 5
Wet days / normal
0.9 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
9 August – 18 August
73°
74.1°
-0.6°
19 August – 28 August
74.7°
73°
+0.9°
29 August – 7 September
at normal
71.5°
—
August records over 66 years
91.2°8 August 2001All-time high
48.9°27 August 2025All-time low
Mon, 1082° / 65°0.15
82 °
Harrisville, Monday, 10 August
Rain. High 82°, low 65°.
Pressure29.85 inHg
Wind7 mph W
Humidity72%
Visibility6.2 mi
Dew point66°
Tue, 1175° / 62°0
75 °
Harrisville, Tuesday, 11 August
Overcast. High 75°, low 62°.
Pressure29.94 inHg
Wind2.2 mph SE
Humidity44%
Visibility6.2 mi
Dew point52°
Wed, 1274° / 61°0.03
74 °
Harrisville, Wednesday, 12 August
Light rain. High 74°, low 61°.
Pressure29.77 inHg
Wind9.8 mph N
Humidity63%
Visibility6.2 mi
Dew point60°
Thu, 1367° / 55°0
67 °
Harrisville, Thursday, 13 August
Mostly clear. High 67°, low 55°.
Pressure29.97 inHg
Wind13.8 mph N
Humidity46%
Visibility—
Dew point44°
Fri, 1467° / 52°0
67 °
Harrisville, Friday, 14 August
Mostly clear. High 67°, low 52°.
Pressure30.15 inHg
Wind15.1 mph N
Humidity59%
Visibility—
Dew point48°
Sat, 1570° / 54°0
70 °
Harrisville, Saturday, 15 August
Overcast. High 70°, low 54°.
Pressure30.30 inHg
Wind8.8 mph NW
Humidity49%
Visibility—
Dew point48°
Sun, 1666° / 60°0.01
66 °
Harrisville, Sunday, 16 August
Light rain. High 66°, low 60°.
Pressure30.12 inHg
Wind7.5 mph SW
Humidity68%
Visibility—
Dew point55°
Mon, 1774° / 62°0.08
74 °
Harrisville, Monday, 17 August
Light rain. High 74°, low 62°.
Pressure30.03 inHg
Wind13.2 mph NE
Humidity57%
Visibility—
Dew point56°
Tue, 1873° / 58°0
73 °
Harrisville, Tuesday, 18 August
Mostly clear. High 73°, low 58°.
Pressure30.06 inHg
Wind13.6 mph SE
Humidity57%
Visibility—
Dew point55°
Wed, 1982° / 65°0
82 °
Harrisville, Wednesday, 19 August
Partly cloudy. High 82°, low 65°.
Pressure29.94 inHg
Wind12.8 mph SE
Humidity51%
Visibility—
Dew point60°
Thu, 2086° / 67°0.06
86 °
Harrisville, Thursday, 20 August
Light rain. High 86°, low 67°.
Pressure29.77 inHg
Wind12.9 mph S
Humidity72%
Visibility—
Dew point67°
Fri, 2174° / 65°0
74 °
Harrisville, Friday, 21 August
Overcast. High 74°, low 65°.
Pressure29.91 inHg
Wind13.4 mph NE
Humidity66%
Visibility—
Dew point61°
Sat, 2273° / 60°0.01
73 °
Harrisville, Saturday, 22 August
Light rain. High 73°, low 60°.
Pressure30.00 inHg
Wind10.8 mph NE
Humidity54%
Visibility—
Dew point54°
Sun, 2367° / 65°0.54
67 °
Harrisville, Sunday, 23 August
Rain. High 67°, low 65°.
Pressure29.94 inHg
Wind17.5 mph NE
Humidity87%
Visibility—
Dew point62°
Mon, 2467° / 64°0
67 °
Harrisville, Monday, 24 August
Overcast. High 67°, low 64°.
Pressure30.18 inHg
Wind20.4 mph NE
Humidity61%
Visibility—
Dew point53°
From day 17 onward the outlook is built from 60-year climate statistics
Tue, 2573° / 65°0.07
73 °
Harrisville, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high73°
Average low65°
Average precipitation0.07 in
Chance of precipitation27%
Record high91° (2021)
Record low51° (2017)
Wed, 2673° / 65°0.15
73 °
Harrisville, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high73°
Average low65°
Average precipitation0.15 in
Chance of precipitation38%
Record high83° (1983)
Record low50° (2017)
Thu, 2774° / 65°0.17
74 °
Harrisville, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high74°
Average low65°
Average precipitation0.17 in
Chance of precipitation52%
Record high86° (1973)
Record low49° (2025)
Fri, 2873° / 64°0.11
73 °
Harrisville, Friday, 28 August
Climate normal for this date — 60-year average.
Average high73°
Average low64°
Average precipitation0.11 in
Chance of precipitation40%
Record high86° (2018)
Record low50° (1965)
Sat, 2973° / 64°0.13
73 °
Harrisville, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high73°
Average low64°
Average precipitation0.13 in
Chance of precipitation48%
Record high87° (2021)
Record low51° (1982)
Sun, 3072° / 64°0.09
72 °
Harrisville, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high72°
Average low64°
Average precipitation0.09 in
Chance of precipitation33%
Record high84° (1973)
Record low49° (2025)
Mon, 3172° / 62°0.05
72 °
Harrisville, Monday, 31 August
Climate normal for this date — 60-year average.
Average high72°
Average low62°
Average precipitation0.05 in
Chance of precipitation22%
Record high83° (2024)
Record low51° (2023)
Tue, 0171° / 63°0.07
71 °
Harrisville, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high71°
Average low63°
Average precipitation0.07 in
Chance of precipitation27%
Record high82° (1973)
Record low51° (2017)
Wed, 0272° / 63°0.08
72 °
Harrisville, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high72°
Average low63°
Average precipitation0.08 in
Chance of precipitation35%
Record high84° (2011)
Record low49° (2017)
Thu, 0372° / 62°0.11
72 °
Harrisville, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high72°
Average low62°
Average precipitation0.11 in
Chance of precipitation37%
Record high88° (2023)
Record low51° (2017)
Fri, 0471° / 62°0.08
71 °
Harrisville, Friday, 4 September
Climate normal for this date — 60-year average.
Average high71°
Average low62°
Average precipitation0.08 in
Chance of precipitation32%
Record high89° (2023)
Record low46° (2025)
Sat, 0571° / 62°0.11
71 °
Harrisville, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high71°
Average low62°
Average precipitation0.11 in
Chance of precipitation37%
Record high87° (2018)
Record low50° (2019)
Sun, 0671° / 62°0.06
71 °
Harrisville, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high71°
Average low62°
Average precipitation0.06 in
Chance of precipitation33%
Record high82° (1969)
Record low48° (2017)
Mon, 0770° / 61°0.08
70 °
Harrisville, Monday, 7 September
Climate normal for this date — 60-year average.
Average high70°
Average low61°
Average precipitation0.08 in
Chance of precipitation48%
Record high82° (1960)
Record low45° (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 Harrisville, 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 Harrisville, 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.