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As of 01:39 MDT

Weather in Big Sag, MT

46°Current weather

Big Sag, Wednesday, 21 October, 01:39

Clear. Feels like 46°. High 67°, low 37°.

Pressure30.12 inHg
Wind0.7 mph S
Humidity66%
Visibility6.2 mi
Dew point35°
Thu, 2269° / 48°0Clear
69 °Clear

Big Sag, Thursday, 22 October

Clear. High 69°, low 48°.

Pressure29.85 inHg
Wind3.5 mph NE
Humidity54%
Visibility6.2 mi
Dew point46°
Fri, 2352° / 35°0.53Snow
52 °Snow

Big Sag, Friday, 23 October

Snow. High 52°, low 35°.

Pressure29.91 inHg
Wind16.5 mph NW
Humidity92%
Visibility2.5 mi
Dew point42°
Sat, 2446° / 29°0Clear
46 °Clear

Big Sag, Saturday, 24 October

Clear. High 46°, low 29°.

Pressure30.42 inHg
Wind3 mph S
Humidity64%
Visibility6.2 mi
Dew point23°
Sun, 2544° / 29°0Mostly clear
44 °Mostly clear

Big Sag, Sunday, 25 October

Mostly clear. High 44°, low 29°.

Pressure30.50 inHg
Wind8.5 mph SW
Humidity74%
Visibility—
Dew point29°
Mon, 2642° / 28°0Clear
42 °Clear

Big Sag, Monday, 26 October

Clear. High 42°, low 28°.

Pressure30.56 inHg
Wind5.5 mph SE
Humidity74%
Visibility—
Dew point29°
Tue, 2747° / 35°0Mostly clear
47 °Mostly clear

Big Sag, Tuesday, 27 October

Mostly clear. High 47°, low 35°.

Pressure30.18 inHg
Wind10.1 mph W
Humidity58%
Visibility—
Dew point31°
Wed, 2850° / 33°0Clear
50 °Clear

Big Sag, Wednesday, 28 October

Clear. High 50°, low 33°.

Pressure30.33 inHg
Wind4.8 mph SW
Humidity51%
Visibility—
Dew point27°
Thu, 2954° / 36°0Clear
54 °Clear

Big Sag, Thursday, 29 October

Clear. High 54°, low 36°.

Pressure30.03 inHg
Wind10.7 mph S
Humidity51%
Visibility—
Dew point30°
Fri, 3053° / 38°0Light rain
53 °Light rain

Big Sag, Friday, 30 October

Light rain. High 53°, low 38°.

Pressure29.56 inHg
Wind20 mph SW
Humidity33%
Visibility—
Dew point24°
Sat, 3153° / 37°0Partly cloudy
53 °Partly cloudy

Big Sag, Saturday, 31 October

Partly cloudy. High 53°, low 37°.

Pressure29.59 inHg
Wind15.2 mph W
Humidity31%
Visibility—
Dew point19°
Sun, 0152° / 41°0Clear
52 °Clear

Big Sag, Sunday, 1 November

Clear. High 52°, low 41°.

Pressure29.91 inHg
Wind9.1 mph SW
Humidity37%
Visibility—
Dew point23°
Mon, 0263° / 43°0Overcast
63 °Overcast

Big Sag, Monday, 2 November

Overcast. High 63°, low 43°.

Pressure30.03 inHg
Wind9.6 mph S
Humidity38%
Visibility—
Dew point29°
Tue, 0369° / 57°0Mostly clear
69 °Mostly clear

Big Sag, Tuesday, 3 November

Mostly clear. High 69°, low 57°.

Pressure30.00 inHg
Wind22.6 mph W
Humidity46%
Visibility—
Dew point44°
Wed, 0469° / 49°0Partly cloudy
69 °Partly cloudy

Big Sag, Wednesday, 4 November

Partly cloudy. High 69°, low 49°.

Pressure30.00 inHg
Wind9 mph W
Humidity43%
Visibility—
Dew point42°
Thu, 0553° / 45°0Overcast
53 °Overcast

Big Sag, Thursday, 5 November

Overcast. High 53°, low 45°.

Pressure30.33 inHg
Wind3.5 mph S
Humidity60%
Visibility—
Dew point38°

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.