Monthly outlook for Cassell, WI: average high 79.9°, average low 62.9°. That is 0.6° above the climate normal for August. Precipitation is expected on 5 days (about 1.8 inches), against a normal of 5 days and 1.9 inches. The warmest day looks like 20 August (92.6°), the coolest 15 August (51.8°).
79.9°/62.9°
Average high / low
+0.6°
Above normal
5 / 5
Wet days / normal
1.8 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
9 August – 18 August
77°
78.9°
-1.1°
19 August – 28 August
84.6°
78.9°
+3.2°
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 (9 mi).
Mon, 1085° / 69°0
85 °
Cassell, Monday, 10 August
Overcast. High 85°, low 69°.
Pressure29.85 inHg
Wind7.7 mph E
Humidity72%
Visibility6.2 mi
Dew point70°
Tue, 1180° / 65°0.57
80 °
Cassell, Tuesday, 11 August
Heavy rain. High 80°, low 65°.
Pressure29.80 inHg
Wind8.8 mph E
Humidity77%
Visibility6.2 mi
Dew point68°
Wed, 1281° / 66°0
81 °
Cassell, Wednesday, 12 August
Overcast. High 81°, low 66°.
Pressure29.88 inHg
Wind6 mph NW
Humidity66%
Visibility6.2 mi
Dew point64°
Thu, 1370° / 58°0
70 °
Cassell, Thursday, 13 August
Overcast. High 70°, low 58°.
Pressure30.06 inHg
Wind7 mph NE
Humidity62%
Visibility—
Dew point55°
Fri, 1474° / 55°0
74 °
Cassell, Friday, 14 August
Overcast. High 74°, low 55°.
Pressure30.18 inHg
Wind7 mph E
Humidity56%
Visibility—
Dew point54°
Sat, 1574° / 52°0
74 °
Cassell, Saturday, 15 August
Overcast. High 74°, low 52°.
Pressure30.24 inHg
Wind9 mph E
Humidity61%
Visibility—
Dew point54°
Sun, 1675° / 63°0.01
75 °
Cassell, Sunday, 16 August
Light rain. High 75°, low 63°.
Pressure30.09 inHg
Wind6.8 mph NW
Humidity86%
Visibility—
Dew point65°
Mon, 1778° / 61°0
78 °
Cassell, Monday, 17 August
Overcast. High 78°, low 61°.
Pressure30.09 inHg
Wind6.6 mph NE
Humidity57%
Visibility—
Dew point58°
Tue, 1878° / 58°0.04
78 °
Cassell, Tuesday, 18 August
Light rain. High 78°, low 58°.
Pressure30.00 inHg
Wind8.7 mph S
Humidity69%
Visibility—
Dew point62°
Wed, 1985° / 68°0.1
85 °
Cassell, Wednesday, 19 August
Light rain. High 85°, low 68°.
Pressure29.85 inHg
Wind12.1 mph SE
Humidity65%
Visibility—
Dew point69°
Thu, 2093° / 74°0.01
93 °
Cassell, Thursday, 20 August
Light rain. High 93°, low 74°.
Pressure29.77 inHg
Wind10.2 mph SE
Humidity54%
Visibility—
Dew point70°
Fri, 2184° / 66°0
84 °
Cassell, Friday, 21 August
Partly cloudy. High 84°, low 66°.
Pressure29.97 inHg
Wind8.1 mph NE
Humidity52%
Visibility—
Dew point60°
Sat, 2288° / 63°0.06
88 °
Cassell, Saturday, 22 August
Light rain. High 88°, low 63°.
Pressure29.83 inHg
Wind13.4 mph SE
Humidity59%
Visibility—
Dew point65°
Sun, 2381° / 64°0.04
81 °
Cassell, Sunday, 23 August
Light rain. High 81°, low 64°.
Pressure29.85 inHg
Wind15.6 mph E
Humidity65%
Visibility—
Dew point65°
Mon, 2476° / 62°0
76 °
Cassell, Monday, 24 August
Overcast. High 76°, low 62°.
Pressure30.09 inHg
Wind9.4 mph NE
Humidity81%
Visibility—
Dew point64°
From day 17 onward the outlook is built from 60-year climate statistics
Tue, 2580° / 64°0.09
80 °
Cassell, 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 °
Cassell, 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 °
Cassell, 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 °
Cassell, 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 °
Cassell, 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 °
Cassell, 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 °
Cassell, 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 °
Cassell, 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 °
Cassell, 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 °
Cassell, 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 °
Cassell, 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 °
Cassell, 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 °
Cassell, 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 °
Cassell, 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 Cassell, 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 Cassell, 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.