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As of 13:18 MST

Weather in Big Sag, MT

57°Current weather

Big Sag, Monday, 9 November, 13:18

Overcast. Feels like 55°. High 57°, low 35°.

Pressure30.03 inHg
Wind4.7 mph W
Humidity64%
Visibility6.2 mi
Dew point43°
Tue, 1058° / 44°0.03Light rain
58 °Light rain

Big Sag, Tuesday, 10 November

Light rain. High 58°, low 44°.

Pressure30.03 inHg
Wind19.6 mph SW
Humidity44%
Visibility6.2 mi
Dew point34°
Wed, 1165° / 50°0Overcast
65 °Overcast

Big Sag, Wednesday, 11 November

Overcast. High 65°, low 50°.

Pressure30.06 inHg
Wind16.8 mph SW
Humidity37%
Visibility6.2 mi
Dew point37°
Thu, 1264° / 47°0Overcast
64 °Overcast

Big Sag, Thursday, 12 November

Overcast. High 64°, low 47°.

Pressure29.91 inHg
Wind3.3 mph NE
Humidity41%
Visibility6.2 mi
Dew point39°
Fri, 1365° / 44°0Overcast
65 °Overcast

Big Sag, Friday, 13 November

Overcast. High 65°, low 44°.

Pressure29.59 inHg
Wind0.5 mph SW
Humidity39%
Visibility6.2 mi
Dew point35°
Sat, 1458° / 45°0Overcast
58 °Overcast

Big Sag, Saturday, 14 November

Overcast. High 58°, low 45°.

Pressure29.50 inHg
Wind11.9 mph SW
Humidity42%
Visibility—
Dew point34°
Sun, 1561° / 43°0Overcast
61 °Overcast

Big Sag, Sunday, 15 November

Overcast. High 61°, low 43°.

Pressure29.50 inHg
Wind13.7 mph S
Humidity36%
Visibility—
Dew point30°
Mon, 1642° / 37°0.39Snow
42 °Snow

Big Sag, Monday, 16 November

Snow. High 42°, low 37°.

Pressure29.77 inHg
Wind9 mph W
Humidity76%
Visibility—
Dew point35°
Tue, 1743° / 32°0Clear
43 °Clear

Big Sag, Tuesday, 17 November

Clear. High 43°, low 32°.

Pressure30.18 inHg
Wind10.5 mph W
Humidity52%
Visibility—
Dew point23°
Wed, 1839° / 30°0Overcast
39 °Overcast

Big Sag, Wednesday, 18 November

Overcast. High 39°, low 30°.

Pressure30.36 inHg
Wind3.7 mph NE
Humidity53%
Visibility—
Dew point20°
Thu, 1940° / 31°0Overcast
40 °Overcast

Big Sag, Thursday, 19 November

Overcast. High 40°, low 31°.

Pressure30.36 inHg
Wind5.8 mph SE
Humidity52%
Visibility—
Dew point20°
Fri, 2037° / 28°0Overcast
37 °Overcast

Big Sag, Friday, 20 November

Overcast. High 37°, low 28°.

Pressure30.18 inHg
Wind4.3 mph SE
Humidity55%
Visibility—
Dew point19°
Sat, 2137° / 29°0Overcast
37 °Overcast

Big Sag, Saturday, 21 November

Overcast. High 37°, low 29°.

Pressure30.24 inHg
Wind6.2 mph SE
Humidity52%
Visibility—
Dew point17°
Sun, 2243° / 29°0Clear
43 °Clear

Big Sag, Sunday, 22 November

Clear. High 43°, low 29°.

Pressure30.09 inHg
Wind8.6 mph SW
Humidity48%
Visibility—
Dew point19°
Mon, 2341° / 28°0Clear
41 °Clear

Big Sag, Monday, 23 November

Clear. High 41°, low 28°.

Pressure30.06 inHg
Wind5.5 mph SW
Humidity45%
Visibility—
Dew point17°
Tue, 2443° / 30°0Clear
43 °Clear

Big Sag, Tuesday, 24 November

Clear. High 43°, low 30°.

Pressure29.80 inHg
Wind4 mph SE
Humidity35%
Visibility—
Dew point13°

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.