Weather in Sun River, MT
Sun River, Friday, 9 October, 17:53
Overcast. Feels like 72°. High 76°, low 50°.
Monthly outlook for Sun River, MT: average high 54.6°, average low 37.3°. That is 1.8° below the climate normal for October. Precipitation is expected on 5 days (about 2.3 inches), against a normal of 3 days and 0.6 inches. The warmest day looks like 9 October (76.2°), the coolest 13 October (21.8°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 October – 18 October | 50° | 58.4° | -4.7° |
| 19 October – 28 October | 62.4° | 55.6° | +3.8° |
| 29 October – 7 November | at normal | 48.7° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Ulm (12 mi).
0.55
Sun River, Saturday, 10 October
Snow. High 52°, low 32°.
1.02Sun River, Sunday, 11 October
Snow. High 33°, low 28°.
0.3Sun River, Monday, 12 October
Snow. High 33°, low 23°.
0
Sun River, Tuesday, 13 October
Clear. High 36°, low 22°.
0Sun River, Wednesday, 14 October
Clear. High 40°, low 23°.
0Sun River, Thursday, 15 October
Overcast. High 43°, low 32°.
0Sun River, Friday, 16 October
Clear. High 49°, low 32°.
0Sun River, Saturday, 17 October
Overcast. High 67°, low 40°.
0
Sun River, Sunday, 18 October
Mostly clear. High 72°, low 46°.
0
Sun River, Monday, 19 October
Partly cloudy. High 73°, low 47°.
0Sun River, Tuesday, 20 October
Clear. High 60°, low 47°.
0Sun River, Wednesday, 21 October
Clear. High 63°, low 40°.
0.31
Sun River, Thursday, 22 October
Rain. High 70°, low 46°.
0.08Sun River, Friday, 23 October
Light rain. High 54°, low 47°.
0Sun River, Saturday, 24 October
Clear. High 55°, low 41°.
0.02Sun River, Sunday, 25 October
Climate normal for this date — 60-year average.
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.
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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