Weather in Portal, MT
Portal, Saturday, 31 October, 02:06
Clear. Feels like 28°. High 44°, low 28°.
Monthly outlook for Portal, MT: average high 47.4°, average low 30.9°. That is 2.2° above the climate normal for October. Precipitation is expected on 4 days (about 0.6 inches), against a normal of 4 days and 0.6 inches. The warmest day looks like 9 November (57.5°), the coolest 2 November (23.5°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 31 October – 9 November | 47.4° | 44.6° | +1.5° |
| 10 November – 19 November | 47.3° | 40.6° | +3.7° |
| 20 November – 29 November | at normal | 35.3° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Jefferson City (5 mi).
0.31
Portal, Sunday, 1 November
Snow. High 38°, low 29°.
0.05Portal, Monday, 2 November
Snow. High 41°, low 23°.
0
Portal, Tuesday, 3 November
Overcast. High 49°, low 24°.
0
Portal, Wednesday, 4 November
Clear. High 48°, low 25°.
0Portal, Thursday, 5 November
Overcast. High 47°, low 28°.
0.08Portal, Friday, 6 November
Snow. High 50°, low 32°.
0
Portal, Saturday, 7 November
Partly cloudy. High 43°, low 28°.
0Portal, Sunday, 8 November
Overcast. High 57°, low 38°.
0Portal, Monday, 9 November
Overcast. High 57°, low 42°.
0Portal, Tuesday, 10 November
Overcast. High 53°, low 41°.
0.01
Portal, Wednesday, 11 November
Light rain. High 48°, low 31°.
0Portal, Thursday, 12 November
Clear. High 46°, low 26°.
0Portal, Friday, 13 November
Overcast. High 48°, low 30°.
0Portal, Saturday, 14 November
Overcast. High 49°, low 36°.
0.01Portal, Sunday, 15 November
Light rain. High 40°, low 35°.
0.04Portal, Monday, 16 November
Climate normal for this date — 60-year average.
0.04Portal, Tuesday, 17 November
Climate normal for this date — 60-year average.
0.05Portal, Wednesday, 18 November
Climate normal for this date — 60-year average.
0.06Portal, Thursday, 19 November
Climate normal for this date — 60-year average.
0.03Portal, Friday, 20 November
Climate normal for this date — 60-year average.
0.03Portal, Saturday, 21 November
Climate normal for this date — 60-year average.
0.04Portal, Sunday, 22 November
Climate normal for this date — 60-year average.
0.04Portal, Monday, 23 November
Climate normal for this date — 60-year average.
0.06
Portal, Tuesday, 24 November
Climate normal for this date — 60-year average.
0.09Portal, Wednesday, 25 November
Climate normal for this date — 60-year average.
0.04Portal, Thursday, 26 November
Climate normal for this date — 60-year average.
0.04Portal, Friday, 27 November
Climate normal for this date — 60-year average.
0.04Portal, Saturday, 28 November
Climate normal for this date — 60-year average.
0.04Portal, Sunday, 29 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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