Weather in Portal, MT
Portal, Saturday, 17 October, 06:06
Overcast. Feels like 41°. High 61°, low 36°.
Monthly outlook for Portal, MT: average high 47.4°, average low 29.2°. That is 1.9° below the climate normal for October. Precipitation is expected on 4 days (about 1.2 inches), against a normal of 4 days and 0.7 inches. The warmest day looks like 17 October (61.2°), the coolest 25 October (21.3°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 17 October – 26 October | 51.6° | 53.2° | -0.9° |
| 27 October – 5 November | 40.4° | 46.5° | -3.4° |
| 6 November – 15 November | at normal | 42.1° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Jefferson City (5 mi).
0Portal, Sunday, 18 October
Overcast. High 57°, low 29°.
0
Portal, Monday, 19 October
Partly cloudy. High 60°, low 35°.
0Portal, Tuesday, 20 October
Overcast. High 50°, low 36°.
0
Portal, Wednesday, 21 October
Clear. High 59°, low 32°.
0Portal, Thursday, 22 October
Overcast. High 60°, low 37°.
0.93
Portal, Friday, 23 October
Snow. High 47°, low 33°.
0.13Portal, Saturday, 24 October
Snow. High 35°, low 24°.
0Portal, Sunday, 25 October
Overcast. High 42°, low 21°.
0Portal, Monday, 26 October
Overcast. High 43°, low 28°.
0.08Portal, Tuesday, 27 October
Snow. High 42°, low 31°.
0Portal, Wednesday, 28 October
Light snow. High 42°, low 24°.
0.04Portal, Thursday, 29 October
Snow. High 40°, low 29°.
0Portal, Friday, 30 October
Clear. High 37°, low 24°.
0.02Portal, Saturday, 31 October
Light snow. High 36°, low 25°.
0Portal, Sunday, 1 November
Partly cloudy. High 46°, low 24°.
0.04Portal, Monday, 2 November
Climate normal for this date — 60-year average.
0.04Portal, Tuesday, 3 November
Climate normal for this date — 60-year average.
0.06
Portal, Wednesday, 4 November
Climate normal for this date — 60-year average.
0.05Portal, Thursday, 5 November
Climate normal for this date — 60-year average.
0.05Portal, Friday, 6 November
Climate normal for this date — 60-year average.
0.04Portal, Saturday, 7 November
Climate normal for this date — 60-year average.
0.07Portal, Sunday, 8 November
Climate normal for this date — 60-year average.
0.04Portal, Monday, 9 November
Climate normal for this date — 60-year average.
0.04Portal, Tuesday, 10 November
Climate normal for this date — 60-year average.
0.03Portal, Wednesday, 11 November
Climate normal for this date — 60-year average.
0.03Portal, Thursday, 12 November
Climate normal for this date — 60-year average.
0.04Portal, Friday, 13 November
Climate normal for this date — 60-year average.
0.03Portal, Saturday, 14 November
Climate normal for this date — 60-year average.
0.02
Portal, Sunday, 15 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 Portal, 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 Portal, 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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