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As of 08:11 MST

Weather in Big Sag, MT

56°Current weather

Big Sag, Friday, 13 November, 08:11

Overcast. Feels like 53°. High 57°, low 36°.

Pressure29.68 inHg
Wind1.5 mph NE
Humidity36%
Visibility6.2 mi
Dew point30°
Sat, 1459° / 33°0Clear
59 °Clear

Big Sag, Saturday, 14 November

Clear. High 59°, low 33°.

Pressure29.59 inHg
Wind16.5 mph SW
Humidity38%
Visibility6.2 mi
Dew point35°
Sun, 1559° / 43°0Overcast
59 °Overcast

Big Sag, Sunday, 15 November

Overcast. High 59°, low 43°.

Pressure29.83 inHg
Wind14.2 mph SW
Humidity36%
Visibility6.2 mi
Dew point29°
Mon, 1654° / 43°0.04Light rain
54 °Light rain

Big Sag, Monday, 16 November

Light rain. High 54°, low 43°.

Pressure29.88 inHg
Wind1.3 mph N
Humidity43%
Visibility6.2 mi
Dew point32°
Tue, 1743° / 33°0.61Snow
43 °Snow

Big Sag, Tuesday, 17 November

Snow. High 43°, low 33°.

Pressure30.06 inHg
Wind6.3 mph W
Humidity99%
Visibility—
Dew point36°
Wed, 1840° / 29°0.04Snow
40 °Snow

Big Sag, Wednesday, 18 November

Snow. High 40°, low 29°.

Pressure29.94 inHg
Wind11.6 mph W
Humidity84%
Visibility—
Dew point31°
Thu, 1937° / 29°0.04Light snow
37 °Light snow

Big Sag, Thursday, 19 November

Light snow. High 37°, low 29°.

Pressure30.15 inHg
Wind8.3 mph E
Humidity77%
Visibility—
Dew point29°
Fri, 2034° / 30°0.07Light snow
34 °Light snow

Big Sag, Friday, 20 November

Light snow. High 34°, low 30°.

Pressure30.06 inHg
Wind6.5 mph N
Humidity88%
Visibility—
Dew point30°
Sat, 2130° / 13°0.24Snow
30 °Snow

Big Sag, Saturday, 21 November

Snow. High 30°, low 13°.

Pressure30.21 inHg
Wind12 mph NW
Humidity89%
Visibility—
Dew point23°
Sun, 2220° / 5°0Overcast
20 °Overcast

Big Sag, Sunday, 22 November

Overcast. High 20°, low 5°.

Pressure30.42 inHg
Wind10 mph NW
Humidity79%
Visibility—
Dew point11°
Mon, 2324° / 5°0Clear
24 °Clear

Big Sag, Monday, 23 November

Clear. High 24°, low 5°.

Pressure30.68 inHg
Wind6.4 mph SE
Humidity54%
Visibility—
Dew point3°
Tue, 2425° / 17°0Clear
25 °Clear

Big Sag, Tuesday, 24 November

Clear. High 25°, low 17°.

Pressure30.53 inHg
Wind9.5 mph SW
Humidity62%
Visibility—
Dew point13°
Wed, 2532° / 18°0Overcast
32 °Overcast

Big Sag, Wednesday, 25 November

Overcast. High 32°, low 18°.

Pressure30.15 inHg
Wind7.5 mph S
Humidity69%
Visibility—
Dew point18°
Thu, 2636° / 25°0Overcast
36 °Overcast

Big Sag, Thursday, 26 November

Overcast. High 36°, low 25°.

Pressure30.03 inHg
Wind7 mph SW
Humidity74%
Visibility—
Dew point25°
Fri, 2738° / 26°0Overcast
38 °Overcast

Big Sag, Friday, 27 November

Overcast. High 38°, low 26°.

Pressure30.00 inHg
Wind7 mph S
Humidity68%
Visibility—
Dew point24°
Sat, 2839° / 33°0.03Light snow
39 °Light snow

Big Sag, Saturday, 28 November

Light snow. High 39°, low 33°.

Pressure29.74 inHg
Wind18 mph SW
Humidity82%
Visibility—
Dew point31°

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 Big Sag, 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 Big Sag, 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.