Weather in Sumner, MI
Sumner, Thursday, 8 October, 04:21
Clear. Feels like 38°. High 66°, low 41°.
Monthly outlook for Sumner, MI: average high 65.6°, average low 46.1°. That is 4° above the climate normal for October. Precipitation is expected on 6 days (about 0.4 inches), against a normal of 5 days and 1.6 inches. The warmest day looks like 15 October (82.8°), the coolest 22 October (36.5°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 8 October – 17 October | 69.2° | 59.8° | +5.2° |
| 18 October – 27 October | 59.6° | 55.5° | +2.2° |
| 28 October – 6 November | at normal | 51.9° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Crystal (6 mi).
0
Sumner, Friday, 9 October
Clear. High 69°, low 46°.
0
Sumner, Saturday, 10 October
Mostly clear. High 77°, low 53°.
0
Sumner, Sunday, 11 October
Overcast. High 71°, low 57°.
0Sumner, Monday, 12 October
Overcast. High 75°, low 52°.
0.04
Sumner, Tuesday, 13 October
Light rain. High 66°, low 47°.
0
Sumner, Wednesday, 14 October
Partly cloudy. High 58°, low 39°.
0.04Sumner, Thursday, 15 October
Light rain. High 83°, low 51°.
0.04Sumner, Friday, 16 October
Light rain. High 72°, low 54°.
0Sumner, Saturday, 17 October
Partly cloudy. High 54°, low 42°.
0Sumner, Sunday, 18 October
Overcast. High 59°, low 43°.
0.06Sumner, Monday, 19 October
Light rain. High 61°, low 44°.
0.05Sumner, Tuesday, 20 October
Light rain. High 64°, low 43°.
0Sumner, Wednesday, 21 October
Clear. High 53°, low 39°.
0.02Sumner, Thursday, 22 October
Light rain. High 60°, low 37°.
0.17Sumner, Friday, 23 October
Light rain. High 61°, low 49°.
0.08Sumner, Saturday, 24 October
Climate normal for this date — 60-year average.
0.08
Sumner, Sunday, 25 October
Climate normal for this date — 60-year average.
0.09Sumner, Monday, 26 October
Climate normal for this date — 60-year average.
0.08Sumner, Tuesday, 27 October
Climate normal for this date — 60-year average.
0.07Sumner, Wednesday, 28 October
Climate normal for this date — 60-year average.
0.06Sumner, Thursday, 29 October
Climate normal for this date — 60-year average.
0.08Sumner, Friday, 30 October
Climate normal for this date — 60-year average.
0.11Sumner, Saturday, 31 October
Climate normal for this date — 60-year average.
0.13Sumner, Sunday, 1 November
Climate normal for this date — 60-year average.
0.15Sumner, Monday, 2 November
Climate normal for this date — 60-year average.
0.07Sumner, Tuesday, 3 November
Climate normal for this date — 60-year average.
0.08Sumner, Wednesday, 4 November
Climate normal for this date — 60-year average.
0.12Sumner, Thursday, 5 November
Climate normal for this date — 60-year average.
0.11Sumner, Friday, 6 November
Climate normal for this date — 60-year average.
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 Sumner, 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 Sumner, 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.
Sun and moon today
Weather history
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