Weather in Sun River, MT
Sun River, Saturday, 10 October, 13:35
Snow. Feels like 27°. High 55°, low 34°.
Monthly outlook for Sun River, MT: average high 52.5°, average low 36.6°. That is 2.8° below the climate normal for October. Precipitation is expected on 3 days (about 1.6 inches), against a normal of 3 days and 0.6 inches. The warmest day looks like 18 October (65.3°), the coolest 14 October (19.9°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 10 October – 19 October | 48.8° | 58.1° | -5.2° |
| 20 October – 29 October | 58.7° | 54.8° | +2.2° |
| 30 October – 8 November | at normal | 48.2° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Ulm (12 mi).
0.7Sun River, Sunday, 11 October
Snow. High 35°, low 31°.
0.22Sun River, Monday, 12 October
Snow. High 33°, low 23°.
0
Sun River, Tuesday, 13 October
Clear. High 38°, low 23°.
0Sun River, Wednesday, 14 October
Clear. High 44°, low 20°.
0Sun River, Thursday, 15 October
Clear. High 51°, low 30°.
0
Sun River, Friday, 16 October
Mostly clear. High 45°, low 32°.
0
Sun River, Saturday, 17 October
Partly cloudy. High 62°, low 35°.
0
Sun River, Sunday, 18 October
Overcast. High 65°, low 49°.
0
Sun River, Monday, 19 October
Light rain. High 59°, low 48°.
0.02Sun River, Tuesday, 20 October
Light rain. High 50°, low 42°.
0Sun River, Wednesday, 21 October
Overcast. High 57°, low 42°.
0Sun River, Thursday, 22 October
Overcast. High 58°, low 39°.
0Sun River, Friday, 23 October
Overcast. High 62°, low 45°.
0Sun River, Saturday, 24 October
Overcast. High 63°, low 50°.
0Sun River, Sunday, 25 October
Mostly clear. High 60°, low 43°.
0.05Sun River, Monday, 26 October
Climate normal for this date — 60-year average.
0.04Sun River, Tuesday, 27 October
Climate normal for this date — 60-year average.
0.04Sun River, Wednesday, 28 October
Climate normal for this date — 60-year average.
0.04Sun River, Thursday, 29 October
Climate normal for this date — 60-year average.
0.02Sun River, Friday, 30 October
Climate normal for this date — 60-year average.
0.03Sun River, Saturday, 31 October
Climate normal for this date — 60-year average.
0.03Sun River, Sunday, 1 November
Climate normal for this date — 60-year average.
0.02Sun River, Monday, 2 November
Climate normal for this date — 60-year average.
0.03Sun River, Tuesday, 3 November
Climate normal for this date — 60-year average.
0.04Sun River, Wednesday, 4 November
Climate normal for this date — 60-year average.
0.04Sun River, Thursday, 5 November
Climate normal for this date — 60-year average.
0.04Sun River, Friday, 6 November
Climate normal for this date — 60-year average.
0.02Sun River, Saturday, 7 November
Climate normal for this date — 60-year average.
0.04Sun River, Sunday, 8 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 Sun River, MT 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 Sun River, MT 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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