Weather in Portal, MT
Portal, Thursday, 29 October, 04:56
Overcast. Feels like 22°. High 46°, low 27°.
Monthly outlook for Portal, MT: average high 48°, average low 31.8°. That is 2.2° above the climate normal for October. Precipitation is expected on 3 days (about 0.7 inches), against a normal of 4 days and 0.7 inches. The warmest day looks like 12 November (58.8°), the coolest 3 November (21.9°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 29 October – 7 November | 45.4° | 45.5° | -0° |
| 8 November – 17 November | 52.3° | 41.4° | +6.1° |
| 18 November – 27 November | at normal | 36.3° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Jefferson City (5 mi).
0.03
Portal, Friday, 30 October
Light rain. High 49°, low 31°.
0Portal, Saturday, 31 October
Overcast. High 45°, low 26°.
0.36
Portal, Sunday, 1 November
Snow. High 37°, low 30°.
0.21Portal, Monday, 2 November
Light snow. High 32°, low 25°.
0Portal, Tuesday, 3 November
Overcast. High 45°, low 22°.
0
Portal, Wednesday, 4 November
Clear. High 50°, low 30°.
0Portal, Thursday, 5 November
Overcast. High 54°, low 34°.
0Portal, Friday, 6 November
Overcast. High 52°, low 38°.
0Portal, Saturday, 7 November
Overcast. High 44°, low 33°.
0Portal, Sunday, 8 November
Overcast. High 47°, low 32°.
0Portal, Monday, 9 November
Overcast. High 49°, low 34°.
0.02Portal, Tuesday, 10 November
Light rain. High 55°, low 35°.
0Portal, Wednesday, 11 November
Overcast. High 57°, low 40°.
0Portal, Thursday, 12 November
Overcast. High 59°, low 39°.
0.04Portal, Friday, 13 November
Light snow. High 47°, low 31°.
0.03
Portal, 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.
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.
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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