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As of 22:14 MDT

Weather in Big Sag, MT

60°Current weather

Big Sag, Wednesday, 21 October, 22:14

Mostly clear. Feels like 58°. High 69°, low 34°.

Pressure29.91 inHg
Wind9.7 mph S
Humidity46%
Visibility6.2 mi
Dew point38°
Thu, 2270° / 40°0Clear
70 °Clear

Big Sag, Thursday, 22 October

Clear. High 70°, low 40°.

Pressure29.88 inHg
Wind3.3 mph N
Humidity52%
Visibility6.2 mi
Dew point44°
Fri, 2348° / 35°0.74Snow
48 °Snow

Big Sag, Friday, 23 October

Snow. High 48°, low 35°.

Pressure29.88 inHg
Wind14.8 mph NW
Humidity93%
Visibility2.0 mi
Dew point40°
Sat, 2444° / 27°0Clear
44 °Clear

Big Sag, Saturday, 24 October

Clear. High 44°, low 27°.

Pressure30.42 inHg
Wind5.5 mph E
Humidity68%
Visibility6.2 mi
Dew point23°
Sun, 2539° / 25°0Clear
39 °Clear

Big Sag, Sunday, 25 October

Clear. High 39°, low 25°.

Pressure30.50 inHg
Wind1.5 mph SW
Humidity82%
Visibility6.2 mi
Dew point23°
Mon, 2642° / 28°0Clear
42 °Clear

Big Sag, Monday, 26 October

Clear. High 42°, low 28°.

Pressure30.53 inHg
Wind7.5 mph SW
Humidity77%
Visibility—
Dew point30°
Tue, 2738° / 26°0Overcast
38 °Overcast

Big Sag, Tuesday, 27 October

Overcast. High 38°, low 26°.

Pressure30.45 inHg
Wind6 mph SE
Humidity81%
Visibility—
Dew point30°
Wed, 2844° / 29°0Partly cloudy
44 °Partly cloudy

Big Sag, Wednesday, 28 October

Partly cloudy. High 44°, low 29°.

Pressure30.24 inHg
Wind6.4 mph S
Humidity78%
Visibility—
Dew point33°
Thu, 2955° / 38°0Overcast
55 °Overcast

Big Sag, Thursday, 29 October

Overcast. High 55°, low 38°.

Pressure29.77 inHg
Wind11.5 mph SW
Humidity61%
Visibility—
Dew point35°
Fri, 3054° / 44°0Partly cloudy
54 °Partly cloudy

Big Sag, Friday, 30 October

Partly cloudy. High 54°, low 44°.

Pressure29.56 inHg
Wind22.3 mph SW
Humidity54%
Visibility—
Dew point34°
Sat, 3149° / 35°0Mostly clear
49 °Mostly clear

Big Sag, Saturday, 31 October

Mostly clear. High 49°, low 35°.

Pressure29.68 inHg
Wind17.6 mph SW
Humidity47%
Visibility—
Dew point25°
Sun, 0141° / 34°0Overcast
41 °Overcast

Big Sag, Sunday, 1 November

Overcast. High 41°, low 34°.

Pressure30.21 inHg
Wind5.2 mph SW
Humidity63%
Visibility—
Dew point28°
Mon, 0247° / 34°0Overcast
47 °Overcast

Big Sag, Monday, 2 November

Overcast. High 47°, low 34°.

Pressure30.27 inHg
Wind4.3 mph SE
Humidity39%
Visibility—
Dew point19°
Tue, 0363° / 40°0Partly cloudy
63 °Partly cloudy

Big Sag, Tuesday, 3 November

Partly cloudy. High 63°, low 40°.

Pressure29.88 inHg
Wind28.8 mph SW
Humidity28%
Visibility—
Dew point23°
Wed, 0457° / 41°0.02Light rain
57 °Light rain

Big Sag, Wednesday, 4 November

Light rain. High 57°, low 41°.

Pressure29.77 inHg
Wind25 mph SW
Humidity47%
Visibility—
Dew point34°
Thu, 0561° / 39°0.01Light rain
61 °Light rain

Big Sag, Thursday, 5 November

Light rain. High 61°, low 39°.

Pressure29.65 inHg
Wind28.5 mph W
Humidity57%
Visibility—
Dew point40°

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.