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As of 22:26 MDT

Weather in Big Sag, MT

43°Current weather

Big Sag, Thursday, 15 October, 22:26

Clear. Feels like 39°. High 50°, low 35°.

Pressure30.62 inHg
Wind5.8 mph SE
Humidity57%
Visibility6.2 mi
Dew point30°
Fri, 1669° / 35°0Partly cloudy
69 °Partly cloudy

Big Sag, Friday, 16 October

Partly cloudy. High 69°, low 35°.

Pressure30.30 inHg
Wind1.5 mph NW
Humidity38%
Visibility6.2 mi
Dew point37°
Sat, 1773° / 51°0Overcast
73 °Overcast

Big Sag, Saturday, 17 October

Overcast. High 73°, low 51°.

Pressure29.88 inHg
Wind18.4 mph SW
Humidity24%
Visibility6.2 mi
Dew point30°
Sun, 1862° / 44°0Clear
62 °Clear

Big Sag, Sunday, 18 October

Clear. High 62°, low 44°.

Pressure30.06 inHg
Wind5.1 mph E
Humidity45%
Visibility6.2 mi
Dew point36°
Mon, 1963° / 39°0Overcast
63 °Overcast

Big Sag, Monday, 19 October

Overcast. High 63°, low 39°.

Pressure29.85 inHg
Wind4 mph NE
Humidity61%
Visibility6.2 mi
Dew point41°
Tue, 2061° / 43°0Overcast
61 °Overcast

Big Sag, Tuesday, 20 October

Overcast. High 61°, low 43°.

Pressure29.83 inHg
Wind4.6 mph N
Humidity61%
Visibility—
Dew point42°
Wed, 2161° / 40°0Mostly clear
61 °Mostly clear

Big Sag, Wednesday, 21 October

Mostly clear. High 61°, low 40°.

Pressure30.06 inHg
Wind8.3 mph SE
Humidity63%
Visibility—
Dew point39°
Thu, 2269° / 53°0.01Light rain
69 °Light rain

Big Sag, Thursday, 22 October

Light rain. High 69°, low 53°.

Pressure29.68 inHg
Wind9.3 mph W
Humidity35%
Visibility—
Dew point36°
Fri, 2351° / 37°0.39Snow
51 °Snow

Big Sag, Friday, 23 October

Snow. High 51°, low 37°.

Pressure30.00 inHg
Wind18 mph NW
Humidity63%
Visibility—
Dew point32°
Sat, 2446° / 33°0.02Light snow
46 °Light snow

Big Sag, Saturday, 24 October

Light snow. High 46°, low 33°.

Pressure30.42 inHg
Wind11.4 mph NW
Humidity38%
Visibility—
Dew point17°
Sun, 2552° / 34°0Clear
52 °Clear

Big Sag, Sunday, 25 October

Clear. High 52°, low 34°.

Pressure30.15 inHg
Wind9.7 mph S
Humidity31%
Visibility—
Dew point17°
Mon, 2645° / 36°0.02Light snow
45 °Light snow

Big Sag, Monday, 26 October

Light snow. High 45°, low 36°.

Pressure30.09 inHg
Wind8.5 mph NW
Humidity66%
Visibility—
Dew point31°
Tue, 2747° / 35°0.09Light snow
47 °Light snow

Big Sag, Tuesday, 27 October

Light snow. High 47°, low 35°.

Pressure29.94 inHg
Wind14.2 mph SW
Humidity65%
Visibility—
Dew point30°
Wed, 2855° / 43°0Overcast
55 °Overcast

Big Sag, Wednesday, 28 October

Overcast. High 55°, low 43°.

Pressure29.59 inHg
Wind28.3 mph W
Humidity37%
Visibility—
Dew point26°
Thu, 2952° / 37°0Clear
52 °Clear

Big Sag, Thursday, 29 October

Clear. High 52°, low 37°.

Pressure29.94 inHg
Wind17.9 mph W
Humidity38%
Visibility—
Dew point22°
Fri, 3059° / 43°0.01Light rain
59 °Light rain

Big Sag, Friday, 30 October

Light rain. High 59°, low 43°.

Pressure29.74 inHg
Wind21.8 mph W
Humidity46%
Visibility—
Dew point35°

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.