Weather in Portal, MT
Portal, Wednesday, 21 October, 03:52
Clear. Feels like 33°. High 61°, low 36°.
Monthly outlook for Portal, MT: average high 43.7°, average low 25.5°. That is 2.7° below the climate normal for October. Precipitation is expected on 6 days (about 2.4 inches), against a normal of 4 days and 0.7 inches. The warmest day looks like 22 October (61.8°), the coolest 28 October (15.8°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 21 October – 30 October | 45° | 50.3° | -2.9° |
| 31 October – 9 November | 41.4° | 44.6° | -1.8° |
| 10 November – 19 November | at normal | 40.6° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Jefferson City (5 mi).
0
Portal, Thursday, 22 October
Clear. High 62°, low 37°.
1.17
Portal, Friday, 23 October
Snow. High 43°, low 27°.
0
Portal, Saturday, 24 October
Partly cloudy. High 36°, low 16°.
0Portal, Sunday, 25 October
Partly cloudy. High 37°, low 22°.
0.28Portal, Monday, 26 October
Snow. High 43°, low 21°.
0.07Portal, Tuesday, 27 October
Light snow. High 32°, low 17°.
0
Portal, Wednesday, 28 October
Mostly clear. High 39°, low 16°.
0
Portal, Thursday, 29 October
Overcast. High 46°, low 21°.
0Portal, Friday, 30 October
Clear. High 51°, low 26°.
0Portal, Saturday, 31 October
Partly cloudy. High 53°, low 33°.
0Portal, Sunday, 1 November
Partly cloudy. High 52°, low 36°.
0.47
Portal, Monday, 2 November
Rain. High 49°, low 37°.
0.34Portal, Tuesday, 3 November
Snow. High 33°, low 20°.
0.04Portal, Wednesday, 4 November
Light snow. High 27°, low 19°.
0.01Portal, Thursday, 5 November
Light snow. High 33°, low 21°.
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.
0.07
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.
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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