Monthly outlook for Decker, MI: average high 65.9°, average low 48°. That is 4.4° above the climate normal for October. Precipitation is expected on 5 days (about 1.2 inches), against a normal of 5 days and 1.5 inches. The warmest day looks like 16 October (86.4°), the coolest 14 October (36°).
65.9°/48°
Average high / low
+4.4°
Above normal
5 / 5
Wet days / normal
1.2 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
8 October – 17 October
71°
59.5°
+6.4°
18 October – 27 October
57.5°
55.2°
+1.3°
28 October – 6 November
at normal
51.8°
—
October records over 66 years
86.5°4 October 2025All-time high
23.5°31 October 2020All-time low
Climate normals and records are computed from the nearest reference point — Cass City (12 mi).
Fri, 0967° / 47°0
67 °
Decker, Friday, 9 October
Partly cloudy. High 67°, low 47°.
Pressure30.18 inHg
Wind5.1 mph W
Humidity48%
Visibility6.2 mi
Dew point42°
Sat, 1076° / 55°0
76 °
Decker, Saturday, 10 October
Clear. High 76°, low 55°.
Pressure30.24 inHg
Wind10.2 mph S
Humidity55%
Visibility6.2 mi
Dew point54°
Sun, 1168° / 57°0
68 °
Decker, Sunday, 11 October
Overcast. High 68°, low 57°.
Pressure30.12 inHg
Wind8 mph S
Humidity66%
Visibility6.2 mi
Dew point55°
Mon, 1273° / 54°0
73 °
Decker, Monday, 12 October
Overcast. High 73°, low 54°.
Pressure29.77 inHg
Wind9.1 mph SW
Humidity65%
Visibility—
Dew point56°
Tue, 1365° / 42°0.1
65 °
Decker, Tuesday, 13 October
Light rain. High 65°, low 42°.
Pressure29.85 inHg
Wind17.1 mph NW
Humidity63%
Visibility—
Dew point42°
Wed, 1457° / 36°0
57 °
Decker, Wednesday, 14 October
Clear. High 57°, low 36°.
Pressure30.15 inHg
Wind8.2 mph NW
Humidity37%
Visibility—
Dew point28°
Thu, 1581° / 49°0.02
81 °
Decker, Thursday, 15 October
Light rain. High 81°, low 49°.
Pressure29.85 inHg
Wind18 mph SW
Humidity45%
Visibility—
Dew point49°
Fri, 1686° / 68°0.26
86 °
Decker, Friday, 16 October
Rain. High 86°, low 68°.
Pressure29.85 inHg
Wind20.9 mph SW
Humidity46%
Visibility—
Dew point61°
Sat, 1769° / 50°0.3
69 °
Decker, Saturday, 17 October
Rain. High 69°, low 50°.
Pressure30.06 inHg
Wind14.7 mph SW
Humidity67%
Visibility—
Dew point53°
Sun, 1855° / 46°0.24
55 °
Decker, Sunday, 18 October
Rain. High 55°, low 46°.
Pressure30.18 inHg
Wind11.5 mph W
Humidity55%
Visibility—
Dew point38°
Mon, 1957° / 42°0
57 °
Decker, Monday, 19 October
Partly cloudy. High 57°, low 42°.
Pressure30.27 inHg
Wind6.5 mph N
Humidity50%
Visibility—
Dew point36°
Tue, 2062° / 42°0
62 °
Decker, Tuesday, 20 October
Clear. High 62°, low 42°.
Pressure30.03 inHg
Wind14.5 mph NW
Humidity47%
Visibility—
Dew point39°
Wed, 2151° / 39°0
51 °
Decker, Wednesday, 21 October
Overcast. High 51°, low 39°.
Pressure30.24 inHg
Wind13.1 mph N
Humidity49%
Visibility—
Dew point31°
Thu, 2258° / 38°0.01
58 °
Decker, Thursday, 22 October
Light rain. High 58°, low 38°.
Pressure29.88 inHg
Wind16.2 mph S
Humidity43%
Visibility—
Dew point33°
Fri, 2362° / 50°0.22
62 °
Decker, Friday, 23 October
Rain. High 62°, low 50°.
Pressure29.71 inHg
Wind19.3 mph S
Humidity69%
Visibility—
Dew point51°
From day 17 onward the outlook is built from 60-year climate statistics
Sat, 2456° / 43°0.07
56 °
Decker, Saturday, 24 October
Climate normal for this date — 60-year average.
Average high56°
Average low43°
Average precipitation0.07 in
Chance of precipitation32%
Record high78° (1963)
Record low26° (1981)
Sun, 2555° / 42°0.07
55 °
Decker, Sunday, 25 October
Climate normal for this date — 60-year average.
Average high55°
Average low42°
Average precipitation0.07 in
Chance of precipitation32%
Record high76° (1963)
Record low29° (2018)
Mon, 2654° / 42°0.08
54 °
Decker, Monday, 26 October
Climate normal for this date — 60-year average.
Average high54°
Average low42°
Average precipitation0.08 in
Chance of precipitation35%
Record high74° (1963)
Record low29° (2006)
Tue, 2753° / 41°0.11
53 °
Decker, Tuesday, 27 October
Climate normal for this date — 60-year average.
Average high53°
Average low41°
Average precipitation0.11 in
Chance of precipitation38%
Record high74° (2023)
Record low26° (1976)
Wed, 2853° / 40°0.06
53 °
Decker, Wednesday, 28 October
Climate normal for this date — 60-year average.
Average high53°
Average low40°
Average precipitation0.06 in
Chance of precipitation23%
Record high70° (1989)
Record low25° (1967)
Thu, 2952° / 40°0.05
52 °
Decker, Thursday, 29 October
Climate normal for this date — 60-year average.
Average high52°
Average low40°
Average precipitation0.05 in
Chance of precipitation22%
Record high74° (2024)
Record low24° (1967)
Fri, 3053° / 39°0.09
53 °
Decker, Friday, 30 October
Climate normal for this date — 60-year average.
Average high53°
Average low39°
Average precipitation0.09 in
Chance of precipitation27%
Record high74° (2024)
Record low28° (1969)
Sat, 3153° / 41°0.11
53 °
Decker, Saturday, 31 October
Climate normal for this date — 60-year average.
Average high53°
Average low41°
Average precipitation0.11 in
Chance of precipitation37%
Record high74° (2024)
Record low24° (2020)
Sun, 0153° / 41°0.11
53 °
Decker, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high53°
Average low41°
Average precipitation0.11 in
Chance of precipitation42%
Record high71° (2016)
Record low28° (2023)
Mon, 0252° / 40°0.16
52 °
Decker, Monday, 2 November
Climate normal for this date — 60-year average.
Average high52°
Average low40°
Average precipitation0.16 in
Chance of precipitation43%
Record high67° (1961)
Record low28° (1984)
Tue, 0350° / 39°0.09
50 °
Decker, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high50°
Average low39°
Average precipitation0.09 in
Chance of precipitation37%
Record high70° (1987)
Record low24° (1991)
Wed, 0451° / 39°0.06
51 °
Decker, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high51°
Average low39°
Average precipitation0.06 in
Chance of precipitation27%
Record high71° (2015)
Record low22° (1966)
Thu, 0551° / 39°0.12
51 °
Decker, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high51°
Average low39°
Average precipitation0.12 in
Chance of precipitation33%
Record high71° (1978)
Record low21° (1991)
Fri, 0650° / 37°0.09
50 °
Decker, Friday, 6 November
Climate normal for this date — 60-year average.
Average high50°
Average low37°
Average precipitation0.09 in
Chance of precipitation33%
Record high69° (2024)
Record low19° (1966)
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, MI 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, MI 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.