Monthly outlook for Lake Wisconsin, WI: average high 77.6°, average low 60.9°. That is 0.7° below the climate normal for August. Precipitation is expected on 6 days (about 1.1 inches), against a normal of 5 days and 1.9 inches. The warmest day looks like 12 August (84.4°), the coolest 23 August (54.5°).
77.6°/60.9°
Average high / low
−0.7°
Below normal
6 / 5
Wet days / normal
1.1 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
9 August – 18 August
77.4°
78.9°
-0.8°
19 August – 28 August
77.7°
78.9°
-0.7°
29 August – 7 September
at normal
76.9°
—
August records over 66 years
97.5°23 August 2023All-time high
44.8°29 August 1965All-time low
Climate normals and records are computed from the nearest reference point — Sauk City (11 mi).
Mon, 1084° / 72°0.02
84 °
Lake Wisconsin, Monday, 10 August
Light rain. High 84°, low 72°.
Pressure29.91 inHg
Wind3.3 mph NE
Humidity81%
Visibility6.2 mi
Dew point70°
Tue, 1179° / 64°0.04
79 °
Lake Wisconsin, Tuesday, 11 August
Light rain. High 79°, low 64°.
Pressure29.88 inHg
Wind4.7 mph E
Humidity95%
Visibility6.2 mi
Dew point67°
Wed, 1284° / 64°0
84 °
Lake Wisconsin, Wednesday, 12 August
Clear. High 84°, low 64°.
Pressure29.88 inHg
Wind6.8 mph N
Humidity61%
Visibility6.2 mi
Dew point65°
Thu, 1372° / 60°0.02
72 °
Lake Wisconsin, Thursday, 13 August
Light rain. High 72°, low 60°.
Pressure30.00 inHg
Wind9.2 mph E
Humidity75%
Visibility—
Dew point61°
Fri, 1475° / 55°0
75 °
Lake Wisconsin, Friday, 14 August
Mostly clear. High 75°, low 55°.
Pressure30.18 inHg
Wind10.3 mph E
Humidity59%
Visibility—
Dew point56°
Sat, 1573° / 61°0.03
73 °
Lake Wisconsin, Saturday, 15 August
Light rain. High 73°, low 61°.
Pressure30.21 inHg
Wind11.6 mph SE
Humidity72%
Visibility—
Dew point60°
Sun, 1670° / 64°0.02
70 °
Lake Wisconsin, Sunday, 16 August
Light rain. High 70°, low 64°.
Pressure30.03 inHg
Wind12.7 mph NW
Humidity79%
Visibility—
Dew point62°
Mon, 1777° / 58°0
77 °
Lake Wisconsin, Monday, 17 August
Overcast. High 77°, low 58°.
Pressure30.09 inHg
Wind5.2 mph W
Humidity59%
Visibility—
Dew point57°
Tue, 1879° / 60°0
79 °
Lake Wisconsin, Tuesday, 18 August
Overcast. High 79°, low 60°.
Pressure29.85 inHg
Wind11 mph SW
Humidity73%
Visibility—
Dew point59°
Wed, 1977° / 61°0.11
77 °
Lake Wisconsin, Wednesday, 19 August
Light rain. High 77°, low 61°.
Pressure29.88 inHg
Wind12.6 mph N
Humidity76%
Visibility—
Dew point60°
Thu, 2075° / 58°0.11
75 °
Lake Wisconsin, Thursday, 20 August
Light rain. High 75°, low 58°.
Pressure29.91 inHg
Wind5.5 mph N
Humidity66%
Visibility—
Dew point61°
Fri, 2181° / 62°0.25
81 °
Lake Wisconsin, Friday, 21 August
Rain. High 81°, low 62°.
Pressure29.77 inHg
Wind12.4 mph SW
Humidity86%
Visibility—
Dew point65°
Sat, 2277° / 61°0.11
77 °
Lake Wisconsin, Saturday, 22 August
Light rain. High 77°, low 61°.
Pressure29.80 inHg
Wind15.7 mph NW
Humidity53%
Visibility—
Dew point57°
Sun, 2377° / 54°0
77 °
Lake Wisconsin, Sunday, 23 August
Clear. High 77°, low 54°.
Pressure30.15 inHg
Wind10.8 mph W
Humidity59%
Visibility—
Dew point56°
Mon, 2480° / 58°0
80 °
Lake Wisconsin, Monday, 24 August
Partly cloudy. High 80°, low 58°.
Pressure30.18 inHg
Wind8.2 mph SW
Humidity60%
Visibility—
Dew point60°
From day 17 onward the outlook is built from 60-year climate statistics
Tue, 2580° / 64°0.09
80 °
Lake Wisconsin, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high80°
Average low64°
Average precipitation0.09 in
Chance of precipitation27%
Record high90° (2020)
Record low51° (2025)
Wed, 2679° / 64°0.14
79 °
Lake Wisconsin, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high79°
Average low64°
Average precipitation0.14 in
Chance of precipitation37%
Record high93° (2024)
Record low48° (2025)
Thu, 2779° / 64°0.15
79 °
Lake Wisconsin, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high79°
Average low64°
Average precipitation0.15 in
Chance of precipitation35%
Record high92° (2024)
Record low48° (1968)
Fri, 2879° / 63°0.15
79 °
Lake Wisconsin, Friday, 28 August
Climate normal for this date — 60-year average.
Average high79°
Average low63°
Average precipitation0.15 in
Chance of precipitation38%
Record high93° (1984)
Record low45° (1986)
Sat, 2978° / 62°0.11
78 °
Lake Wisconsin, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high78°
Average low62°
Average precipitation0.11 in
Chance of precipitation30%
Record high92° (1984)
Record low45° (1965)
Sun, 3078° / 62°0.07
78 °
Lake Wisconsin, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high78°
Average low62°
Average precipitation0.07 in
Chance of precipitation33%
Record high91° (2012)
Record low49° (1974)
Mon, 3178° / 61°0.04
78 °
Lake Wisconsin, Monday, 31 August
Climate normal for this date — 60-year average.
Average high78°
Average low61°
Average precipitation0.04 in
Chance of precipitation17%
Record high91° (2000)
Record low48° (1967)
Tue, 0178° / 61°0.1
78 °
Lake Wisconsin, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high78°
Average low61°
Average precipitation0.1 in
Chance of precipitation28%
Record high92° (2011)
Record low48° (1967)
Wed, 0278° / 61°0.09
78 °
Lake Wisconsin, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high78°
Average low61°
Average precipitation0.09 in
Chance of precipitation28%
Record high91° (2008)
Record low47° (1974)
Thu, 0377° / 62°0.11
77 °
Lake Wisconsin, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high77°
Average low62°
Average precipitation0.11 in
Chance of precipitation32%
Record high94° (2023)
Record low45° (1974)
Fri, 0476° / 60°0.09
76 °
Lake Wisconsin, Friday, 4 September
Climate normal for this date — 60-year average.
Average high76°
Average low60°
Average precipitation0.09 in
Chance of precipitation32%
Record high93° (2023)
Record low44° (2025)
Sat, 0576° / 60°0.07
76 °
Lake Wisconsin, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high76°
Average low60°
Average precipitation0.07 in
Chance of precipitation27%
Record high90° (2023)
Record low46° (1974)
Sun, 0676° / 60°0.07
76 °
Lake Wisconsin, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high76°
Average low60°
Average precipitation0.07 in
Chance of precipitation23%
Record high90° (1990)
Record low45° (1962)
Mon, 0776° / 60°0.1
76 °
Lake Wisconsin, Monday, 7 September
Climate normal for this date — 60-year average.
Average high76°
Average low60°
Average precipitation0.1 in
Chance of precipitation28%
Record high90° (1960)
Record low42° (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 Lake Wisconsin, WI 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 Lake Wisconsin, WI 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.