Monthly outlook for Greendale, WI: average high 74.9°, average low 61.9°. That is 1.5° below the climate normal for August. Precipitation is expected on 7 days (about 1.4 inches), against a normal of 6 days and 1.9 inches. The warmest day looks like 9 August (84.3°), the coolest 23 August (53.3°).
74.9°/61.9°
Average high / low
−1.5°
Below normal
7 / 6
Wet days / normal
1.4 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
8 August – 17 August
77.3°
78°
-0.4°
18 August – 27 August
70.8°
77.4°
-3.7°
28 August – 6 September
at normal
76.1°
—
August records over 66 years
99.3°23 August 2023All-time high
49.5°28 August 1986All-time low
Climate normals and records are computed from the nearest reference point — Milwaukee (9 mi).
Sun, 0984° / 64°0.4
84 °
Greendale, Sunday, 9 August
Rain. High 84°, low 64°.
Pressure29.88 inHg
Wind15.6 mph S
Humidity94%
Visibility6.2 mi
Dew point65°
Mon, 1079° / 68°0.12
79 °
Greendale, Monday, 10 August
Light rain. High 79°, low 68°.
Pressure29.91 inHg
Wind1.4 mph E
Humidity82%
Visibility6.2 mi
Dew point70°
Tue, 1174° / 65°0.13
74 °
Greendale, Tuesday, 11 August
Light rain. High 74°, low 65°.
Pressure29.91 inHg
Wind14.5 mph N
Humidity97%
Visibility5.3 mi
Dew point67°
Wed, 1283° / 64°0
83 °
Greendale, Wednesday, 12 August
Clear. High 83°, low 64°.
Pressure29.85 inHg
Wind3.3 mph W
Humidity64%
Visibility6.2 mi
Dew point67°
Thu, 1369° / 59°0.06
69 °
Greendale, Thursday, 13 August
Light rain. High 69°, low 59°.
Pressure29.97 inHg
Wind11.3 mph NE
Humidity64%
Visibility—
Dew point55°
Fri, 1471° / 58°0
71 °
Greendale, Friday, 14 August
Clear. High 71°, low 58°.
Pressure30.21 inHg
Wind7.4 mph E
Humidity50%
Visibility—
Dew point49°
Sat, 1576° / 56°0
76 °
Greendale, Saturday, 15 August
Overcast. High 76°, low 56°.
Pressure30.30 inHg
Wind8.4 mph SW
Humidity51%
Visibility—
Dew point53°
Sun, 1677° / 58°0
77 °
Greendale, Sunday, 16 August
Overcast. High 77°, low 58°.
Pressure30.18 inHg
Wind11 mph SW
Humidity52%
Visibility—
Dew point55°
Mon, 1778° / 66°0.01
78 °
Greendale, Monday, 17 August
Light rain. High 78°, low 66°.
Pressure29.97 inHg
Wind7.5 mph S
Humidity72%
Visibility—
Dew point66°
Tue, 1876° / 65°0.05
76 °
Greendale, Tuesday, 18 August
Light rain. High 76°, low 65°.
Pressure30.06 inHg
Wind8.7 mph NE
Humidity55%
Visibility—
Dew point57°
Wed, 1974° / 65°0.36
74 °
Greendale, Wednesday, 19 August
Rain. High 74°, low 65°.
Pressure29.94 inHg
Wind6.4 mph E
Humidity78%
Visibility—
Dew point66°
Thu, 2074° / 64°0.01
74 °
Greendale, Thursday, 20 August
Light rain. High 74°, low 64°.
Pressure29.94 inHg
Wind11.2 mph NE
Humidity73%
Visibility—
Dew point63°
Fri, 2172° / 62°0
72 °
Greendale, Friday, 21 August
Overcast. High 72°, low 62°.
Pressure30.00 inHg
Wind9.1 mph NE
Humidity64%
Visibility—
Dew point58°
Sat, 2265° / 57°0.23
65 °
Greendale, Saturday, 22 August
Light rain. High 65°, low 57°.
Pressure30.00 inHg
Wind18 mph NE
Humidity75%
Visibility—
Dew point57°
Sun, 2364° / 53°0
64 °
Greendale, Sunday, 23 August
Overcast. High 64°, low 53°.
Pressure30.27 inHg
Wind13.8 mph NE
Humidity57%
Visibility—
Dew point47°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 2477° / 65°0.11
77 °
Greendale, Monday, 24 August
Climate normal for this date — 60-year average.
Average high77°
Average low65°
Average precipitation0.11 in
Chance of precipitation37%
Record high95° (2020)
Record low56° (1966)
Tue, 2578° / 66°0.09
78 °
Greendale, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high78°
Average low66°
Average precipitation0.09 in
Chance of precipitation27%
Record high92° (2021)
Record low53° (2025)
Wed, 2678° / 66°0.16
78 °
Greendale, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high78°
Average low66°
Average precipitation0.16 in
Chance of precipitation40%
Record high93° (2020)
Record low52° (2025)
Thu, 2778° / 66°0.11
78 °
Greendale, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high78°
Average low66°
Average precipitation0.11 in
Chance of precipitation35%
Record high94° (2024)
Record low55° (2025)
Fri, 2878° / 65°0.12
78 °
Greendale, Friday, 28 August
Climate normal for this date — 60-year average.
Average high78°
Average low65°
Average precipitation0.12 in
Chance of precipitation38%
Record high93° (2021)
Record low49° (1986)
Sat, 2977° / 65°0.1
77 °
Greendale, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high77°
Average low65°
Average precipitation0.1 in
Chance of precipitation27%
Record high89° (2022)
Record low51° (1965)
Sun, 3076° / 65°0.07
76 °
Greendale, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high76°
Average low65°
Average precipitation0.07 in
Chance of precipitation33%
Record high89° (2013)
Record low53° (2023)
Mon, 3176° / 64°0.04
76 °
Greendale, Monday, 31 August
Climate normal for this date — 60-year average.
Average high76°
Average low64°
Average precipitation0.04 in
Chance of precipitation13%
Record high87° (2012)
Record low51° (2009)
Tue, 0176° / 64°0.09
76 °
Greendale, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high76°
Average low64°
Average precipitation0.09 in
Chance of precipitation27%
Record high89° (2022)
Record low51° (2009)
Wed, 0276° / 64°0.05
76 °
Greendale, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high76°
Average low64°
Average precipitation0.05 in
Chance of precipitation28%
Record high89° (2011)
Record low50° (2017)
Thu, 0376° / 64°0.09
76 °
Greendale, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high76°
Average low64°
Average precipitation0.09 in
Chance of precipitation27%
Record high94° (2023)
Record low50° (1974)
Fri, 0475° / 63°0.07
75 °
Greendale, Friday, 4 September
Climate normal for this date — 60-year average.
Average high75°
Average low63°
Average precipitation0.07 in
Chance of precipitation28%
Record high91° (2023)
Record low47° (2025)
Sat, 0575° / 62°0.08
75 °
Greendale, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high75°
Average low62°
Average precipitation0.08 in
Chance of precipitation27%
Record high89° (2023)
Record low48° (2019)
Sun, 0675° / 63°0.08
75 °
Greendale, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high75°
Average low63°
Average precipitation0.08 in
Chance of precipitation35%
Record high89° (1990)
Record low48° (2017)
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 Greendale, 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 Greendale, 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.