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As of 16:39 MDT

Weather in Big Sag, MT

73°Current weather

Big Sag, Wednesday, 21 October, 16:39

Clear. Feels like 71°. High 73°, low 34°.

Pressure29.91 inHg
Wind5.6 mph E
Humidity31%
Visibility6.2 mi
Dew point41°
Thu, 2270° / 39°0Clear
70 °Clear

Big Sag, Thursday, 22 October

Clear. High 70°, low 39°.

Pressure29.88 inHg
Wind4.1 mph NE
Humidity53%
Visibility6.2 mi
Dew point45°
Fri, 2349° / 34°0.69Snow
49 °Snow

Big Sag, Friday, 23 October

Snow. High 49°, low 34°.

Pressure29.94 inHg
Wind14.8 mph NW
Humidity91%
Visibility2.0 mi
Dew point40°
Sat, 2440° / 26°0Clear
40 °Clear

Big Sag, Saturday, 24 October

Clear. High 40°, low 26°.

Pressure30.45 inHg
Wind3.7 mph E
Humidity78%
Visibility6.2 mi
Dew point26°
Sun, 2537° / 25°0Overcast
37 °Overcast

Big Sag, Sunday, 25 October

Overcast. High 37°, low 25°.

Pressure30.47 inHg
Wind6.4 mph SW
Humidity90%
Visibility6.2 mi
Dew point26°
Mon, 2642° / 28°0Clear
42 °Clear

Big Sag, Monday, 26 October

Clear. High 42°, low 28°.

Pressure30.45 inHg
Wind7.4 mph SW
Humidity77%
Visibility—
Dew point30°
Tue, 2743° / 28°0Clear
43 °Clear

Big Sag, Tuesday, 27 October

Clear. High 43°, low 28°.

Pressure30.36 inHg
Wind4.8 mph W
Humidity77%
Visibility—
Dew point31°
Wed, 2842° / 29°0Overcast
42 °Overcast

Big Sag, Wednesday, 28 October

Overcast. High 42°, low 29°.

Pressure30.47 inHg
Wind5.7 mph SE
Humidity55%
Visibility—
Dew point22°
Thu, 2957° / 32°0Overcast
57 °Overcast

Big Sag, Thursday, 29 October

Overcast. High 57°, low 32°.

Pressure29.91 inHg
Wind9.4 mph S
Humidity51%
Visibility—
Dew point30°
Fri, 3058° / 47°0Partly cloudy
58 °Partly cloudy

Big Sag, Friday, 30 October

Partly cloudy. High 58°, low 47°.

Pressure29.74 inHg
Wind19.6 mph W
Humidity40%
Visibility—
Dew point32°
Sat, 3162° / 45°0Partly cloudy
62 °Partly cloudy

Big Sag, Saturday, 31 October

Partly cloudy. High 62°, low 45°.

Pressure29.77 inHg
Wind6.7 mph S
Humidity42%
Visibility—
Dew point33°
Sun, 0158° / 44°0Clear
58 °Clear

Big Sag, Sunday, 1 November

Clear. High 58°, low 44°.

Pressure29.91 inHg
Wind5 mph N
Humidity45%
Visibility—
Dew point33°
Mon, 0256° / 40°0Clear
56 °Clear

Big Sag, Monday, 2 November

Clear. High 56°, low 40°.

Pressure30.09 inHg
Wind4.2 mph NE
Humidity60%
Visibility—
Dew point35°
Tue, 0365° / 44°0Clear
65 °Clear

Big Sag, Tuesday, 3 November

Clear. High 65°, low 44°.

Pressure30.00 inHg
Wind11.6 mph SW
Humidity35%
Visibility—
Dew point29°
Wed, 0463° / 47°0Clear
63 °Clear

Big Sag, Wednesday, 4 November

Clear. High 63°, low 47°.

Pressure30.00 inHg
Wind7.7 mph S
Humidity45%
Visibility—
Dew point35°
Thu, 0567° / 49°0Clear
67 °Clear

Big Sag, Thursday, 5 November

Clear. High 67°, low 49°.

Pressure29.91 inHg
Wind15 mph SW
Humidity39%
Visibility—
Dew point36°

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.