Monthly outlook for Porters, WI: average high 81.4°, average low 64.2°. That is 1.5° above the climate normal for August. Precipitation is expected on 5 days (about 1.6 inches), against a normal of 5 days and 1.8 inches. The warmest day looks like 20 August (93.5°), the coolest 15 August (54.9°).
81.4°/64.2°
Average high / low
+1.5°
Above normal
5 / 5
Wet days / normal
1.6 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
9 August – 18 August
78.2°
78.7°
-0.3°
19 August – 28 August
86.7°
78.8°
+4.4°
29 August – 7 September
at normal
77°
—
August records over 66 years
98.2°1 August 1988All-time high
45.3°29 August 1986All-time low
Climate normals and records are computed from the nearest reference point — Darien (13 mi).
Mon, 1087° / 70°0.19
87 °
Porters, Monday, 10 August
Rain. High 87°, low 70°.
Pressure29.85 inHg
Wind12.1 mph E
Humidity78%
Visibility6.2 mi
Dew point72°
Tue, 1184° / 66°0.18
84 °
Porters, Tuesday, 11 August
Rain. High 84°, low 66°.
Pressure29.80 inHg
Wind12.3 mph SE
Humidity85%
Visibility6.2 mi
Dew point71°
Wed, 1280° / 67°0
80 °
Porters, Wednesday, 12 August
Overcast. High 80°, low 67°.
Pressure29.85 inHg
Wind8 mph NW
Humidity68%
Visibility6.2 mi
Dew point68°
Thu, 1372° / 61°0
72 °
Porters, Thursday, 13 August
Overcast. High 72°, low 61°.
Pressure30.03 inHg
Wind8.3 mph E
Humidity63%
Visibility—
Dew point58°
Fri, 1475° / 56°0
75 °
Porters, Friday, 14 August
Partly cloudy. High 75°, low 56°.
Pressure30.18 inHg
Wind10.2 mph E
Humidity56%
Visibility—
Dew point54°
Sat, 1575° / 55°0
75 °
Porters, Saturday, 15 August
Overcast. High 75°, low 55°.
Pressure30.24 inHg
Wind7.9 mph E
Humidity58%
Visibility—
Dew point56°
Sun, 1674° / 63°0.03
74 °
Porters, Sunday, 16 August
Light rain. High 74°, low 63°.
Pressure30.09 inHg
Wind6.5 mph SE
Humidity82%
Visibility—
Dew point61°
Mon, 1780° / 64°0
80 °
Porters, Monday, 17 August
Partly cloudy. High 80°, low 64°.
Pressure30.06 inHg
Wind7.3 mph E
Humidity62%
Visibility—
Dew point62°
Tue, 1876° / 59°0.02
76 °
Porters, Tuesday, 18 August
Light rain. High 76°, low 59°.
Pressure30.03 inHg
Wind8.1 mph S
Humidity78%
Visibility—
Dew point64°
Wed, 1986° / 67°0.2
86 °
Porters, Wednesday, 19 August
Light rain. High 86°, low 67°.
Pressure29.85 inHg
Wind16.6 mph S
Humidity70%
Visibility—
Dew point70°
Thu, 2094° / 75°0
94 °
Porters, Thursday, 20 August
Overcast. High 94°, low 75°.
Pressure29.77 inHg
Wind7.3 mph SE
Humidity60%
Visibility—
Dew point73°
Fri, 2185° / 70°0
85 °
Porters, Friday, 21 August
Mostly clear. High 85°, low 70°.
Pressure29.94 inHg
Wind11.9 mph NE
Humidity56%
Visibility—
Dew point65°
Sat, 2290° / 65°0.02
90 °
Porters, Saturday, 22 August
Light rain. High 90°, low 65°.
Pressure29.85 inHg
Wind11.6 mph S
Humidity60%
Visibility—
Dew point68°
Sun, 2386° / 66°0.02
86 °
Porters, Sunday, 23 August
Light rain. High 86°, low 66°.
Pressure29.83 inHg
Wind13.4 mph NE
Humidity59%
Visibility—
Dew point68°
Mon, 2480° / 65°0.05
80 °
Porters, Monday, 24 August
Light rain. High 80°, low 65°.
Pressure30.06 inHg
Wind11.4 mph E
Humidity76%
Visibility—
Dew point66°
From day 17 onward the outlook is built from 60-year climate statistics
Tue, 2579° / 64°0.09
79 °
Porters, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high79°
Average low64°
Average precipitation0.09 in
Chance of precipitation28%
Record high91° (2003)
Record low51° (1977)
Wed, 2680° / 64°0.15
80 °
Porters, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high80°
Average low64°
Average precipitation0.15 in
Chance of precipitation30%
Record high93° (2003)
Record low49° (2025)
Thu, 2779° / 65°0.1
79 °
Porters, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high79°
Average low65°
Average precipitation0.1 in
Chance of precipitation28%
Record high93° (2024)
Record low50° (2025)
Fri, 2879° / 63°0.13
79 °
Porters, Friday, 28 August
Climate normal for this date — 60-year average.
Average high79°
Average low63°
Average precipitation0.13 in
Chance of precipitation37%
Record high92° (1984)
Record low46° (1986)
Sat, 2979° / 63°0.12
79 °
Porters, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high79°
Average low63°
Average precipitation0.12 in
Chance of precipitation27%
Record high93° (1984)
Record low45° (1986)
Sun, 3078° / 62°0.07
78 °
Porters, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high78°
Average low62°
Average precipitation0.07 in
Chance of precipitation35%
Record high91° (2013)
Record low52° (1988)
Mon, 3178° / 62°0.06
78 °
Porters, Monday, 31 August
Climate normal for this date — 60-year average.
Average high78°
Average low62°
Average precipitation0.06 in
Chance of precipitation22%
Record high91° (2012)
Record low48° (2009)
Tue, 0177° / 61°0.09
77 °
Porters, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high77°
Average low61°
Average precipitation0.09 in
Chance of precipitation30%
Record high91° (2011)
Record low47° (1967)
Wed, 0278° / 62°0.05
78 °
Porters, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high78°
Average low62°
Average precipitation0.05 in
Chance of precipitation25%
Record high92° (2008)
Record low47° (1965)
Thu, 0377° / 62°0.11
77 °
Porters, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high77°
Average low62°
Average precipitation0.11 in
Chance of precipitation33%
Record high92° (2023)
Record low47° (1974)
Fri, 0476° / 60°0.08
76 °
Porters, Friday, 4 September
Climate normal for this date — 60-year average.
Average high76°
Average low60°
Average precipitation0.08 in
Chance of precipitation33%
Record high91° (2023)
Record low46° (2025)
Sat, 0576° / 60°0.08
76 °
Porters, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high76°
Average low60°
Average precipitation0.08 in
Chance of precipitation22%
Record high88° (2023)
Record low48° (1962)
Sun, 0676° / 60°0.09
76 °
Porters, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high76°
Average low60°
Average precipitation0.09 in
Chance of precipitation32%
Record high90° (1990)
Record low45° (1988)
Mon, 0776° / 60°0.1
76 °
Porters, 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 low44° (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 Porters, 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 Porters, 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.