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As of 06:46 MDT

Weather in Big Sag, MT

35°Current weather

Big Sag, Wednesday, 21 October, 06:46

Clear. Feels like 35°. High 67°, low 35°.

Pressure30.06 inHg
Wind0.6 mph SE
Humidity82%
Visibility6.2 mi
Dew point30°
Thu, 2269° / 41°0Clear
69 °Clear

Big Sag, Thursday, 22 October

Clear. High 69°, low 41°.

Pressure29.88 inHg
Wind3.8 mph N
Humidity51%
Visibility6.2 mi
Dew point45°
Fri, 2351° / 35°0.92Snow
51 °Snow

Big Sag, Friday, 23 October

Snow. High 51°, low 35°.

Pressure29.88 inHg
Wind13.6 mph NW
Humidity93%
Visibility1.5 mi
Dew point43°
Sat, 2443° / 29°0Clear
43 °Clear

Big Sag, Saturday, 24 October

Clear. High 43°, low 29°.

Pressure30.45 inHg
Wind0.8 mph E
Humidity75%
Visibility6.2 mi
Dew point28°
Sun, 2542° / 27°0Mostly clear
42 °Mostly clear

Big Sag, Sunday, 25 October

Mostly clear. High 42°, low 27°.

Pressure30.45 inHg
Wind5.9 mph SW
Humidity78%
Visibility—
Dew point30°
Mon, 2648° / 30°0.04Light snow
48 °Light snow

Big Sag, Monday, 26 October

Light snow. High 48°, low 30°.

Pressure30.33 inHg
Wind6.5 mph E
Humidity76%
Visibility—
Dew point31°
Tue, 2736° / 28°0.1Snow
36 °Snow

Big Sag, Tuesday, 27 October

Snow. High 36°, low 28°.

Pressure30.27 inHg
Wind7.6 mph SW
Humidity89%
Visibility—
Dew point28°
Wed, 2836° / 21°0Overcast
36 °Overcast

Big Sag, Wednesday, 28 October

Overcast. High 36°, low 21°.

Pressure30.47 inHg
Wind8.7 mph SW
Humidity72%
Visibility—
Dew point24°
Thu, 2938° / 24°0Partly cloudy
38 °Partly cloudy

Big Sag, Thursday, 29 October

Partly cloudy. High 38°, low 24°.

Pressure30.24 inHg
Wind4.7 mph SE
Humidity80%
Visibility—
Dew point29°
Fri, 3047° / 29°0Clear
47 °Clear

Big Sag, Friday, 30 October

Clear. High 47°, low 29°.

Pressure29.83 inHg
Wind6.1 mph S
Humidity82%
Visibility—
Dew point37°
Sat, 3154° / 40°0Partly cloudy
54 °Partly cloudy

Big Sag, Saturday, 31 October

Partly cloudy. High 54°, low 40°.

Pressure29.65 inHg
Wind6.4 mph S
Humidity69%
Visibility—
Dew point40°
Sun, 0159° / 43°0Overcast
59 °Overcast

Big Sag, Sunday, 1 November

Overcast. High 59°, low 43°.

Pressure29.71 inHg
Wind17 mph SW
Humidity56%
Visibility—
Dew point39°
Mon, 0258° / 40°0.16Rain
58 °Rain

Big Sag, Monday, 2 November

Rain. High 58°, low 40°.

Pressure29.62 inHg
Wind9.3 mph N
Humidity47%
Visibility—
Dew point36°
Tue, 0337° / 27°1.31Snow
37 °Snow

Big Sag, Tuesday, 3 November

Snow. High 37°, low 27°.

Pressure30.21 inHg
Wind12.8 mph N
Humidity99%
Visibility—
Dew point31°
Wed, 0431° / 24°0Overcast
31 °Overcast

Big Sag, Wednesday, 4 November

Overcast. High 31°, low 24°.

Pressure30.36 inHg
Wind4.8 mph S
Humidity80%
Visibility—
Dew point24°
Thu, 0530° / 22°0Overcast
30 °Overcast

Big Sag, Thursday, 5 November

Overcast. High 30°, low 22°.

Pressure30.50 inHg
Wind8.1 mph SW
Humidity85%
Visibility—
Dew point23°

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.