Monthly outlook for Helena, WI: average high 81°, average low 64°. That is 1.7° above the climate normal for August. Precipitation is expected on 6 days (about 1.4 inches), against a normal of 5 days and 2.0 inches. The warmest day looks like 20 August (93.6°), the coolest 15 August (54°).
81°/64°
Average high / low
+1.7°
Above normal
6 / 5
Wet days / normal
1.4 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
9 August – 18 August
78.1°
78°
+0.1°
19 August – 28 August
85.9°
78.1°
+4.3°
29 August – 7 September
at normal
76.1°
—
August records over 66 years
98.4°23 August 2023All-time high
44.4°28 August 1986All-time low
Climate normals and records are computed from the nearest reference point — Dodgeville (15 mi).
Mon, 1086° / 70°0
86 °
Helena, Monday, 10 August
Overcast. High 86°, low 70°.
Pressure29.88 inHg
Wind4.7 mph SE
Humidity72%
Visibility6.2 mi
Dew point70°
Tue, 1182° / 66°0.5
82 °
Helena, Tuesday, 11 August
Heavy rain. High 82°, low 66°.
Pressure29.80 inHg
Wind7.7 mph E
Humidity77%
Visibility6.2 mi
Dew point68°
Wed, 1281° / 67°0
81 °
Helena, Wednesday, 12 August
Overcast. High 81°, low 67°.
Pressure29.88 inHg
Wind6 mph NW
Humidity67%
Visibility6.2 mi
Dew point64°
Thu, 1371° / 59°0
71 °
Helena, Thursday, 13 August
Overcast. High 71°, low 59°.
Pressure30.06 inHg
Wind7 mph NE
Humidity62%
Visibility—
Dew point56°
Fri, 1475° / 56°0
75 °
Helena, Friday, 14 August
Partly cloudy. High 75°, low 56°.
Pressure30.18 inHg
Wind6.7 mph SE
Humidity56%
Visibility—
Dew point55°
Sat, 1575° / 54°0
75 °
Helena, Saturday, 15 August
Overcast. High 75°, low 54°.
Pressure30.24 inHg
Wind9.3 mph E
Humidity65%
Visibility—
Dew point56°
Sun, 1676° / 64°0.01
76 °
Helena, Sunday, 16 August
Light rain. High 76°, low 64°.
Pressure30.09 inHg
Wind6.9 mph NW
Humidity85%
Visibility—
Dew point66°
Mon, 1778° / 61°0
78 °
Helena, Monday, 17 August
Overcast. High 78°, low 61°.
Pressure30.09 inHg
Wind6.5 mph NE
Humidity56%
Visibility—
Dew point59°
Tue, 1879° / 60°0.06
79 °
Helena, Tuesday, 18 August
Light rain. High 79°, low 60°.
Pressure30.00 inHg
Wind9 mph S
Humidity69%
Visibility—
Dew point62°
Wed, 1986° / 69°0.06
86 °
Helena, Wednesday, 19 August
Light rain. High 86°, low 69°.
Pressure29.85 inHg
Wind12.4 mph SE
Humidity65%
Visibility—
Dew point70°
Thu, 2094° / 75°0.01
94 °
Helena, Thursday, 20 August
Light rain. High 94°, low 75°.
Pressure29.77 inHg
Wind10.4 mph SE
Humidity52%
Visibility—
Dew point71°
Fri, 2186° / 67°0
86 °
Helena, Friday, 21 August
Partly cloudy. High 86°, low 67°.
Pressure29.97 inHg
Wind8.4 mph NE
Humidity51%
Visibility—
Dew point61°
Sat, 2289° / 64°0.04
89 °
Helena, Saturday, 22 August
Light rain. High 89°, low 64°.
Pressure29.83 inHg
Wind14 mph SE
Humidity58%
Visibility—
Dew point66°
Sun, 2383° / 66°0.04
83 °
Helena, Sunday, 23 August
Light rain. High 83°, low 66°.
Pressure29.85 inHg
Wind15.3 mph E
Humidity64%
Visibility—
Dew point66°
Mon, 2478° / 63°0
78 °
Helena, Monday, 24 August
Overcast. High 78°, low 63°.
Pressure30.09 inHg
Wind9.7 mph NE
Humidity80%
Visibility—
Dew point65°
From day 17 onward the outlook is built from 60-year climate statistics
Tue, 2579° / 63°0.1
79 °
Helena, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high79°
Average low63°
Average precipitation0.1 in
Chance of precipitation28%
Record high90° (2003)
Record low50° (2025)
Wed, 2678° / 63°0.15
78 °
Helena, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high78°
Average low63°
Average precipitation0.15 in
Chance of precipitation37%
Record high92° (2003)
Record low49° (1964)
Thu, 2778° / 64°0.13
78 °
Helena, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high78°
Average low64°
Average precipitation0.13 in
Chance of precipitation33%
Record high92° (2024)
Record low49° (1968)
Fri, 2878° / 62°0.16
78 °
Helena, Friday, 28 August
Climate normal for this date — 60-year average.
Average high78°
Average low62°
Average precipitation0.16 in
Chance of precipitation37%
Record high93° (1984)
Record low44° (1986)
Sat, 2978° / 62°0.13
78 °
Helena, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high78°
Average low62°
Average precipitation0.13 in
Chance of precipitation32%
Record high92° (1984)
Record low46° (1965)
Sun, 3077° / 61°0.08
77 °
Helena, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high77°
Average low61°
Average precipitation0.08 in
Chance of precipitation33%
Record high89° (1995)
Record low50° (1974)
Mon, 3177° / 61°0.04
77 °
Helena, Monday, 31 August
Climate normal for this date — 60-year average.
Average high77°
Average low61°
Average precipitation0.04 in
Chance of precipitation22%
Record high91° (2000)
Record low47° (2009)
Tue, 0177° / 60°0.09
77 °
Helena, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high77°
Average low60°
Average precipitation0.09 in
Chance of precipitation27%
Record high91° (2011)
Record low48° (1994)
Wed, 0277° / 61°0.08
77 °
Helena, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high77°
Average low61°
Average precipitation0.08 in
Chance of precipitation33%
Record high89° (2008)
Record low47° (1974)
Thu, 0376° / 61°0.11
76 °
Helena, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high76°
Average low61°
Average precipitation0.11 in
Chance of precipitation33%
Record high92° (2023)
Record low44° (1974)
Fri, 0475° / 59°0.12
75 °
Helena, Friday, 4 September
Climate normal for this date — 60-year average.
Average high75°
Average low59°
Average precipitation0.12 in
Chance of precipitation33%
Record high92° (2023)
Record low44° (2025)
Sat, 0575° / 59°0.07
75 °
Helena, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high75°
Average low59°
Average precipitation0.07 in
Chance of precipitation23%
Record high89° (2023)
Record low46° (1962)
Sun, 0675° / 59°0.07
75 °
Helena, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high75°
Average low59°
Average precipitation0.07 in
Chance of precipitation25%
Record high90° (1990)
Record low44° (1962)
Mon, 0775° / 59°0.14
75 °
Helena, Monday, 7 September
Climate normal for this date — 60-year average.
Average high75°
Average low59°
Average precipitation0.14 in
Chance of precipitation28%
Record high89° (1960)
Record low44° (2024)
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 Helena, 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 Helena, 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.