Weather in Portal, MT
Portal, Friday, 23 October, 00:38
Overcast. Feels like 47°. High 50°, low 25°.
Monthly outlook for Portal, MT: average high 40.9°, average low 22.4°. That is 3.6° below the climate normal for October. Precipitation is expected on 5 days (about 1.8 inches), against a normal of 4 days and 0.7 inches. The warmest day looks like 6 November (58.7°), the coolest 29 October (14.3°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 23 October – 1 November | 35.7° | 48.8° | -7.3° |
| 2 November – 11 November | 49.6° | 43.7° | +3.3° |
| 12 November – 21 November | at normal | 40° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Jefferson City (5 mi).
0
Portal, Saturday, 24 October
Mostly clear. High 40°, low 17°.
0Portal, Sunday, 25 October
Mostly clear. High 36°, low 18°.
0Portal, Monday, 26 October
Overcast. High 43°, low 20°.
0.18
Portal, Tuesday, 27 October
Snow. High 29°, low 24°.
0.14Portal, Wednesday, 28 October
Light snow. High 31°, low 18°.
0.03Portal, Thursday, 29 October
Light snow. High 28°, low 14°.
0.04Portal, Friday, 30 October
Light snow. High 32°, low 22°.
0Portal, Saturday, 31 October
Light snow. High 34°, low 19°.
0.11Portal, Sunday, 1 November
Light snow. High 34°, low 17°.
0Portal, Monday, 2 November
Mostly clear. High 40°, low 16°.
0Portal, Tuesday, 3 November
Mostly clear. High 44°, low 20°.
0Portal, Wednesday, 4 November
Overcast. High 50°, low 27°.
0
Portal, Thursday, 5 November
Clear. High 56°, low 33°.
0
Portal, Friday, 6 November
Partly cloudy. High 59°, low 36°.
0Portal, Saturday, 7 November
Overcast. High 48°, low 32°.
0.07
Portal, 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.
0.02Portal, Sunday, 15 November
Climate normal for this date — 60-year average.
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.
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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