Monthly outlook for Martinsville, WI: average high 77.5°, average low 62.9°. That is 0.8° below the climate normal for August. Precipitation is expected on 9 days (about 3.5 inches), against a normal of 5 days and 1.9 inches. The warmest day looks like 20 August (84°), the coolest 22 August (54.2°).
77.5°/62.9°
Average high / low
−0.8°
Below normal
9 / 5
Wet days / normal
3.5 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
9 August – 18 August
76.8°
78.9°
-1.2°
19 August – 28 August
78.6°
78.9°
-0.2°
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 (10 mi).
Mon, 1083° / 70°0.01
83 °
Martinsville, Monday, 10 August
Light rain. High 83°, low 70°.
Pressure29.97 inHg
Wind7.9 mph SW
Humidity82%
Visibility6.2 mi
Dew point68°
Tue, 1181° / 66°0.6
81 °
Martinsville, Tuesday, 11 August
Heavy rain. High 81°, low 66°.
Pressure29.80 inHg
Wind5.2 mph SE
Humidity80%
Visibility6.2 mi
Dew point67°
Wed, 1277° / 64°0
77 °
Martinsville, Wednesday, 12 August
Overcast. High 77°, low 64°.
Pressure29.91 inHg
Wind3.6 mph NE
Humidity72%
Visibility6.2 mi
Dew point65°
Thu, 1378° / 63°0
78 °
Martinsville, Thursday, 13 August
Overcast. High 78°, low 63°.
Pressure29.97 inHg
Wind6.5 mph SE
Humidity69%
Visibility6.2 mi
Dew point66°
Fri, 1470° / 63°0.14
70 °
Martinsville, Friday, 14 August
Light rain. High 70°, low 63°.
Pressure30.06 inHg
Wind12 mph E
Humidity95%
Visibility—
Dew point67°
Sat, 1581° / 64°1.18
81 °
Martinsville, Saturday, 15 August
Heavy rain. High 81°, low 64°.
Pressure29.91 inHg
Wind11.8 mph SE
Humidity93%
Visibility—
Dew point71°
Sun, 1672° / 64°0.14
72 °
Martinsville, Sunday, 16 August
Rain. High 72°, low 64°.
Pressure30.00 inHg
Wind13.3 mph NW
Humidity82%
Visibility—
Dew point63°
Mon, 1767° / 61°0.61
67 °
Martinsville, Monday, 17 August
Rain. High 67°, low 61°.
Pressure30.03 inHg
Wind12.2 mph SE
Humidity98%
Visibility—
Dew point62°
Tue, 1881° / 66°0.22
81 °
Martinsville, Tuesday, 18 August
Rain. High 81°, low 66°.
Pressure29.83 inHg
Wind12.7 mph W
Humidity71%
Visibility—
Dew point68°
Wed, 1980° / 62°0
80 °
Martinsville, Wednesday, 19 August
Overcast. High 80°, low 62°.
Pressure30.03 inHg
Wind5.6 mph W
Humidity67%
Visibility—
Dew point65°
Thu, 2084° / 66°0.02
84 °
Martinsville, Thursday, 20 August
Light rain. High 84°, low 66°.
Pressure29.80 inHg
Wind9.8 mph SW
Humidity70%
Visibility—
Dew point69°
Fri, 2173° / 60°0.01
73 °
Martinsville, Friday, 21 August
Light rain. High 73°, low 60°.
Pressure29.97 inHg
Wind12.3 mph NE
Humidity72%
Visibility—
Dew point62°
Sat, 2276° / 54°0
76 °
Martinsville, Saturday, 22 August
Clear. High 76°, low 54°.
Pressure30.03 inHg
Wind6.5 mph SW
Humidity57%
Visibility—
Dew point56°
Sun, 2380° / 61°0.05
80 °
Martinsville, Sunday, 23 August
Light rain. High 80°, low 61°.
Pressure29.97 inHg
Wind9.8 mph W
Humidity72%
Visibility—
Dew point64°
Mon, 2478° / 62°0.05
78 °
Martinsville, Monday, 24 August
Light rain. High 78°, low 62°.
Pressure30.03 inHg
Wind8.7 mph NW
Humidity69%
Visibility—
Dew point65°
From day 17 onward the outlook is built from 60-year climate statistics
Tue, 2580° / 64°0.09
80 °
Martinsville, 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 °
Martinsville, 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 °
Martinsville, 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 °
Martinsville, 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 °
Martinsville, 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 °
Martinsville, 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 °
Martinsville, 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 °
Martinsville, 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 °
Martinsville, 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 °
Martinsville, 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 °
Martinsville, 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 °
Martinsville, 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 °
Martinsville, 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 °
Martinsville, 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 Martinsville, 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 Martinsville, 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.