Monthly outlook for Decker, WI: average high 66°, average low 52.3°. That is 5° above the climate normal for October. Precipitation is expected on 4 days (about 0.9 inches), against a normal of 5 days and 1.5 inches. The warmest day looks like 10 October (78.8°), the coolest 14 October (46°).
66°/52.3°
Average high / low
+5°
Above normal
4 / 5
Wet days / normal
0.9 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
8 October – 17 October
68.7°
58.2°
+5.8°
18 October – 27 October
61.6°
54.3°
+4.1°
28 October – 6 November
at normal
50.4°
—
October records over 66 years
81.3°3 October 2025All-time high
28.2°30 October 1988All-time low
Climate normals and records are computed from the nearest reference point — Cedar Grove (7 mi).
Fri, 0971° / 52°0.02
71 °
Decker, Friday, 9 October
Light rain. High 71°, low 52°.
Pressure30.15 inHg
Wind5.6 mph SE
Humidity53%
Visibility6.2 mi
Dew point48°
Sat, 1079° / 56°0
79 °
Decker, Saturday, 10 October
Light rain. High 79°, low 56°.
Pressure30.03 inHg
Wind9.5 mph S
Humidity55%
Visibility6.2 mi
Dew point58°
Sun, 1169° / 58°0
69 °
Decker, Sunday, 11 October
Clear. High 69°, low 58°.
Pressure30.03 inHg
Wind8.7 mph S
Humidity66%
Visibility6.2 mi
Dew point57°
Mon, 1278° / 57°0.02
78 °
Decker, Monday, 12 October
Light rain. High 78°, low 57°.
Pressure29.77 inHg
Wind10.3 mph SW
Humidity56%
Visibility—
Dew point57°
Tue, 1369° / 51°0.02
69 °
Decker, Tuesday, 13 October
Light rain. High 69°, low 51°.
Pressure29.94 inHg
Wind14.8 mph NW
Humidity62%
Visibility—
Dew point48°
Wed, 1457° / 46°0
57 °
Decker, Wednesday, 14 October
Overcast. High 57°, low 46°.
Pressure30.12 inHg
Wind18.2 mph SE
Humidity67%
Visibility—
Dew point44°
Thu, 1577° / 58°0.19
77 °
Decker, Thursday, 15 October
Light rain. High 77°, low 58°.
Pressure29.74 inHg
Wind22 mph S
Humidity67%
Visibility—
Dew point61°
Fri, 1669° / 50°0
69 °
Decker, Friday, 16 October
Clear. High 69°, low 50°.
Pressure29.97 inHg
Wind20.5 mph W
Humidity52%
Visibility—
Dew point45°
Sat, 1750° / 48°0
50 °
Decker, Saturday, 17 October
Overcast. High 50°, low 48°.
Pressure30.47 inHg
Wind14.2 mph N
Humidity67%
Visibility—
Dew point39°
Sun, 1860° / 49°0.04
60 °
Decker, Sunday, 18 October
Light rain. High 60°, low 49°.
Pressure30.24 inHg
Wind7.8 mph W
Humidity55%
Visibility—
Dew point41°
Mon, 1958° / 50°0.1
58 °
Decker, Monday, 19 October
Light rain. High 58°, low 50°.
Pressure30.18 inHg
Wind7.6 mph SW
Humidity74%
Visibility—
Dew point49°
Tue, 2059° / 55°0.42
59 °
Decker, Tuesday, 20 October
Rain. High 59°, low 55°.
Pressure30.09 inHg
Wind9.6 mph E
Humidity81%
Visibility—
Dew point53°
Wed, 2162° / 50°0
62 °
Decker, Wednesday, 21 October
Partly cloudy. High 62°, low 50°.
Pressure29.97 inHg
Wind8.3 mph SE
Humidity61%
Visibility—
Dew point47°
Thu, 2260° / 52°0.05
60 °
Decker, Thursday, 22 October
Light rain. High 60°, low 52°.
Pressure29.71 inHg
Wind19.8 mph SE
Humidity77%
Visibility—
Dew point52°
Fri, 2371° / 56°0.02
71 °
Decker, Friday, 23 October
Light rain. High 71°, low 56°.
Pressure29.77 inHg
Wind12.1 mph S
Humidity76%
Visibility—
Dew point59°
From day 17 onward the outlook is built from 60-year climate statistics
Sat, 2454° / 46°0.1
54 °
Decker, Saturday, 24 October
Climate normal for this date — 60-year average.
Average high54°
Average low46°
Average precipitation0.1 in
Chance of precipitation40%
Record high74° (2023)
Record low30° (1981)
Sun, 2553° / 45°0.06
53 °
Decker, Sunday, 25 October
Climate normal for this date — 60-year average.
Average high53°
Average low45°
Average precipitation0.06 in
Chance of precipitation32%
Record high69° (2023)
Record low33° (1962)
Mon, 2652° / 45°0.09
52 °
Decker, Monday, 26 October
Climate normal for this date — 60-year average.
Average high52°
Average low45°
Average precipitation0.09 in
Chance of precipitation25%
Record high71° (1963)
Record low29° (1962)
Tue, 2753° / 44°0.09
53 °
Decker, Tuesday, 27 October
Climate normal for this date — 60-year average.
Average high53°
Average low44°
Average precipitation0.09 in
Chance of precipitation27%
Record high69° (2023)
Record low29° (2020)
Wed, 2852° / 43°0.07
52 °
Decker, Wednesday, 28 October
Climate normal for this date — 60-year average.
Average high52°
Average low43°
Average precipitation0.07 in
Chance of precipitation27%
Record high63° (1984)
Record low31° (2020)
Thu, 2951° / 43°0.05
51 °
Decker, Thursday, 29 October
Climate normal for this date — 60-year average.
Average high51°
Average low43°
Average precipitation0.05 in
Chance of precipitation22%
Record high78° (2024)
Record low29° (1988)
Fri, 3053° / 44°0.08
53 °
Decker, Friday, 30 October
Climate normal for this date — 60-year average.
Average high53°
Average low44°
Average precipitation0.08 in
Chance of precipitation30%
Record high76° (2024)
Record low28° (1988)
Sat, 3152° / 44°0.1
52 °
Decker, Saturday, 31 October
Climate normal for this date — 60-year average.
Average high52°
Average low44°
Average precipitation0.1 in
Chance of precipitation35%
Record high66° (1971)
Record low28° (2019)
Sun, 0151° / 42°0.15
51 °
Decker, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high51°
Average low42°
Average precipitation0.15 in
Chance of precipitation38%
Record high67° (2022)
Record low21° (2019)
Mon, 0250° / 41°0.13
50 °
Decker, Monday, 2 November
Climate normal for this date — 60-year average.
Average high50°
Average low41°
Average precipitation0.13 in
Chance of precipitation42%
Record high66° (1990)
Record low23° (1991)
Tue, 0349° / 40°0.06
49 °
Decker, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high49°
Average low40°
Average precipitation0.06 in
Chance of precipitation28%
Record high64° (1978)
Record low20° (1991)
Wed, 0449° / 41°0.08
49 °
Decker, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high49°
Average low41°
Average precipitation0.08 in
Chance of precipitation33%
Record high67° (2020)
Record low18° (1991)
Thu, 0549° / 41°0.11
49 °
Decker, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high49°
Average low41°
Average precipitation0.11 in
Chance of precipitation30%
Record high68° (2020)
Record low23° (1991)
Fri, 0649° / 39°0.1
49 °
Decker, Friday, 6 November
Climate normal for this date — 60-year average.
Average high49°
Average low39°
Average precipitation0.1 in
Chance of precipitation27%
Record high69° (2020)
Record low19° (1991)
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 Decker, 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 Decker, 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.