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As of 18:14 MDT

Weather in Portal, MT

85°Current weather

Portal, Saturday, 8 August, 18:14

Clear. Feels like 82°. High 85°, low 49°.

Pressure29.74 inHg
Wind9 mph SW
Humidity13%
Visibility6.2 mi
Dew point30°
Sun, 0980° / 49°0Partly cloudy
80 °Partly cloudy

Portal, Sunday, 9 August

Partly cloudy. High 80°, low 49°.

Pressure29.88 inHg
Wind8.1 mph NW
Humidity12%
Visibility6.2 mi
Dew point23°
Mon, 1086° / 46°0Clear
86 °Clear

Portal, Monday, 10 August

Clear. High 86°, low 46°.

Pressure29.83 inHg
Wind6.5 mph W
Humidity15%
Visibility6.2 mi
Dew point29°
Tue, 1186° / 56°0Clear
86 °Clear

Portal, Tuesday, 11 August

Clear. High 86°, low 56°.

Pressure29.91 inHg
Wind1.1 mph NW
Humidity14%
Visibility6.2 mi
Dew point27°
Wed, 1287° / 57°0Clear
87 °Clear

Portal, Wednesday, 12 August

Clear. High 87°, low 57°.

Pressure29.83 inHg
Wind3.9 mph E
Humidity15%
Visibility6.2 mi
Dew point29°
Thu, 1380° / 50°0Clear
80 °Clear

Portal, Thursday, 13 August

Clear. High 80°, low 50°.

Pressure29.83 inHg
Wind10.2 mph N
Humidity24%
Visibility—
Dew point36°
Fri, 1485° / 62°0Partly cloudy
85 °Partly cloudy

Portal, Friday, 14 August

Partly cloudy. High 85°, low 62°.

Pressure29.85 inHg
Wind12 mph NW
Humidity19%
Visibility—
Dew point33°
Sat, 1570° / 55°0.35Rain
70 °Rain

Portal, Saturday, 15 August

Rain. High 70°, low 55°.

Pressure30.06 inHg
Wind14.5 mph W
Humidity64%
Visibility—
Dew point51°
Sun, 1683° / 54°0.01Light rain
83 °Light rain

Portal, Sunday, 16 August

Light rain. High 83°, low 54°.

Pressure30.00 inHg
Wind10.3 mph NW
Humidity25%
Visibility—
Dew point37°
Mon, 1787° / 56°0Partly cloudy
87 °Partly cloudy

Portal, Monday, 17 August

Partly cloudy. High 87°, low 56°.

Pressure30.03 inHg
Wind4.9 mph W
Humidity18%
Visibility—
Dew point31°
Tue, 1877° / 56°0.07Light rain
77 °Light rain

Portal, Tuesday, 18 August

Light rain. High 77°, low 56°.

Pressure29.94 inHg
Wind21.9 mph W
Humidity29%
Visibility—
Dew point41°
Wed, 1982° / 50°0Clear
82 °Clear

Portal, Wednesday, 19 August

Clear. High 82°, low 50°.

Pressure30.06 inHg
Wind5 mph W
Humidity27%
Visibility—
Dew point37°
Thu, 2085° / 57°0Overcast
85 °Overcast

Portal, Thursday, 20 August

Overcast. High 85°, low 57°.

Pressure29.91 inHg
Wind7.4 mph NW
Humidity19%
Visibility—
Dew point33°
Fri, 2188° / 62°0Clear
88 °Clear

Portal, Friday, 21 August

Clear. High 88°, low 62°.

Pressure29.91 inHg
Wind7.9 mph W
Humidity19%
Visibility—
Dew point35°
Sat, 2289° / 61°0Clear
89 °Clear

Portal, Saturday, 22 August

Clear. High 89°, low 61°.

Pressure29.94 inHg
Wind10.7 mph NW
Humidity21%
Visibility—
Dew point38°
Sun, 2386° / 59°0Overcast
86 °Overcast

Portal, Sunday, 23 August

Overcast. High 86°, low 59°.

Pressure30.03 inHg
Wind11 mph N
Humidity29%
Visibility—
Dew point43°

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.