Monthly outlook for Waupun, WI: average high 75.6°, average low 59.1°. That is 1.3° below the climate normal for August. Precipitation is expected on 8 days (about 3.1 inches), against a normal of 5 days and 2.1 inches. The warmest day looks like 10 August (84.9°), the coolest 20 August (51°).
75.6°/59.1°
Average high / low
−1.3°
Below normal
8 / 5
Wet days / normal
3.1 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
8 August – 17 August
77.8°
78.1°
-0.2°
18 August – 27 August
72°
77.7°
-3.2°
28 August – 6 September
at normal
76.2°
—
August records over 66 years
96.3°23 August 2023All-time high
44.1°29 August 1965All-time low
Climate normals and records are computed from the nearest reference point — Fox Lake (10 mi).
Sun, 0975° / 63°0.93
75 °
Waupun, Sunday, 9 August
Heavy rain. High 75°, low 63°.
Pressure29.94 inHg
Wind4.5 mph S
Humidity99%
Visibility1.7 mi
Dew point65°
Mon, 1085° / 68°0.06
85 °
Waupun, Monday, 10 August
Light rain. High 85°, low 68°.
Pressure29.94 inHg
Wind3.2 mph W
Humidity71%
Visibility6.2 mi
Dew point68°
Tue, 1180° / 65°1.42
80 °
Waupun, Tuesday, 11 August
Heavy rain. High 80°, low 65°.
Pressure29.80 inHg
Wind2.3 mph S
Humidity81%
Visibility6.2 mi
Dew point70°
Wed, 1279° / 61°0.05
79 °
Waupun, Wednesday, 12 August
Light rain. High 79°, low 61°.
Pressure29.85 inHg
Wind12 mph NW
Humidity61%
Visibility6.2 mi
Dew point62°
Thu, 1371° / 55°0
71 °
Waupun, Thursday, 13 August
Overcast. High 71°, low 55°.
Pressure30.06 inHg
Wind8.7 mph SW
Humidity58%
Visibility—
Dew point52°
Fri, 1477° / 57°0
77 °
Waupun, Friday, 14 August
Clear. High 77°, low 57°.
Pressure30.12 inHg
Wind6.7 mph W
Humidity59%
Visibility—
Dew point57°
Sat, 1575° / 56°0.02
75 °
Waupun, Saturday, 15 August
Light rain. High 75°, low 56°.
Pressure30.27 inHg
Wind7.8 mph E
Humidity62%
Visibility—
Dew point58°
Sun, 1674° / 54°0
74 °
Waupun, Sunday, 16 August
Overcast. High 74°, low 54°.
Pressure30.15 inHg
Wind7.5 mph SW
Humidity64%
Visibility—
Dew point57°
Mon, 1780° / 59°0.01
80 °
Waupun, Monday, 17 August
Light rain. High 80°, low 59°.
Pressure30.03 inHg
Wind7.9 mph SW
Humidity69%
Visibility—
Dew point63°
Tue, 1880° / 65°0.2
80 °
Waupun, Tuesday, 18 August
Light rain. High 80°, low 65°.
Pressure29.91 inHg
Wind16.2 mph SW
Humidity77%
Visibility—
Dew point68°
Wed, 1970° / 59°0.02
70 °
Waupun, Wednesday, 19 August
Light rain. High 70°, low 59°.
Pressure29.91 inHg
Wind17.8 mph NW
Humidity64%
Visibility—
Dew point54°
Thu, 2072° / 51°0
72 °
Waupun, Thursday, 20 August
Overcast. High 72°, low 51°.
Pressure30.09 inHg
Wind11.4 mph N
Humidity47%
Visibility—
Dew point46°
Fri, 2173° / 52°0
73 °
Waupun, Friday, 21 August
Clear. High 73°, low 52°.
Pressure30.09 inHg
Wind7.5 mph NE
Humidity48%
Visibility—
Dew point47°
Sat, 2262° / 52°0.32
62 °
Waupun, Saturday, 22 August
Rain. High 62°, low 52°.
Pressure29.88 inHg
Wind13.2 mph S
Humidity91%
Visibility—
Dew point56°
Sun, 2377° / 62°0.04
77 °
Waupun, Sunday, 23 August
Light rain. High 77°, low 62°.
Pressure29.85 inHg
Wind15.7 mph W
Humidity57%
Visibility—
Dew point56°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 2478° / 62°0.11
78 °
Waupun, Monday, 24 August
Climate normal for this date — 60-year average.
Average high78°
Average low62°
Average precipitation0.11 in
Chance of precipitation28%
Record high93° (2023)
Record low49° (1987)
Tue, 2578° / 62°0.1
78 °
Waupun, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high78°
Average low62°
Average precipitation0.1 in
Chance of precipitation28%
Record high89° (2013)
Record low50° (1977)
Wed, 2678° / 63°0.13
78 °
Waupun, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high78°
Average low63°
Average precipitation0.13 in
Chance of precipitation38%
Record high92° (2020)
Record low48° (1964)
Thu, 2778° / 63°0.18
78 °
Waupun, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high78°
Average low63°
Average precipitation0.18 in
Chance of precipitation38%
Record high93° (1976)
Record low49° (1968)
Fri, 2878° / 62°0.18
78 °
Waupun, Friday, 28 August
Climate normal for this date — 60-year average.
Average high78°
Average low62°
Average precipitation0.18 in
Chance of precipitation37%
Record high92° (1984)
Record low44° (1986)
Sat, 2977° / 61°0.11
77 °
Waupun, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high77°
Average low61°
Average precipitation0.11 in
Chance of precipitation33%
Record high90° (1984)
Record low44° (1965)
Sun, 3076° / 61°0.09
76 °
Waupun, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high76°
Average low61°
Average precipitation0.09 in
Chance of precipitation35%
Record high89° (1969)
Record low48° (1974)
Mon, 3176° / 60°0.03
76 °
Waupun, Monday, 31 August
Climate normal for this date — 60-year average.
Average high76°
Average low60°
Average precipitation0.03 in
Chance of precipitation20%
Record high89° (2000)
Record low47° (2009)
Tue, 0176° / 60°0.07
76 °
Waupun, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high76°
Average low60°
Average precipitation0.07 in
Chance of precipitation30%
Record high90° (2011)
Record low46° (1967)
Wed, 0276° / 60°0.09
76 °
Waupun, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high76°
Average low60°
Average precipitation0.09 in
Chance of precipitation27%
Record high91° (2008)
Record low45° (1974)
Thu, 0376° / 60°0.09
76 °
Waupun, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high76°
Average low60°
Average precipitation0.09 in
Chance of precipitation27%
Record high93° (2023)
Record low43° (1974)
Fri, 0475° / 59°0.09
75 °
Waupun, Friday, 4 September
Climate normal for this date — 60-year average.
Average high75°
Average low59°
Average precipitation0.09 in
Chance of precipitation30%
Record high92° (2023)
Record low45° (2025)
Sat, 0575° / 59°0.07
75 °
Waupun, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high75°
Average low59°
Average precipitation0.07 in
Chance of precipitation25%
Record high88° (2023)
Record low46° (1962)
Sun, 0675° / 59°0.07
75 °
Waupun, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high75°
Average low59°
Average precipitation0.07 in
Chance of precipitation32%
Record high89° (2015)
Record low44° (1962)
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 Waupun, 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 Waupun, 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.