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As of 09:34 MDT

Weather in Big Sag, MT

39°Current weather

Big Sag, Thursday, 15 October, 09:34

Clear. Feels like 34°. High 45°, low 37°.

Pressure30.71 inHg
Wind6.2 mph W
Humidity67%
Visibility6.2 mi
Dew point29°
Fri, 1663° / 40°0Mostly clear
63 °Mostly clear

Big Sag, Friday, 16 October

Mostly clear. High 63°, low 40°.

Pressure30.30 inHg
Wind1.8 mph N
Humidity38%
Visibility6.2 mi
Dew point36°
Sat, 1773° / 52°0Overcast
73 °Overcast

Big Sag, Saturday, 17 October

Overcast. High 73°, low 52°.

Pressure29.91 inHg
Wind17.6 mph SW
Humidity23%
Visibility6.2 mi
Dew point30°
Sun, 1863° / 44°0Clear
63 °Clear

Big Sag, Sunday, 18 October

Clear. High 63°, low 44°.

Pressure30.06 inHg
Wind5.8 mph E
Humidity48%
Visibility6.2 mi
Dew point38°
Mon, 1964° / 41°0Partly cloudy
64 °Partly cloudy

Big Sag, Monday, 19 October

Partly cloudy. High 64°, low 41°.

Pressure29.91 inHg
Wind8.4 mph E
Humidity56%
Visibility—
Dew point38°
Tue, 2065° / 43°0Partly cloudy
65 °Partly cloudy

Big Sag, Tuesday, 20 October

Partly cloudy. High 65°, low 43°.

Pressure29.97 inHg
Wind7.9 mph W
Humidity51%
Visibility—
Dew point38°
Wed, 2164° / 44°0Overcast
64 °Overcast

Big Sag, Wednesday, 21 October

Overcast. High 64°, low 44°.

Pressure29.74 inHg
Wind6.6 mph SW
Humidity45%
Visibility—
Dew point34°
Thu, 2260° / 50°0.02Light rain
60 °Light rain

Big Sag, Thursday, 22 October

Light rain. High 60°, low 50°.

Pressure29.68 inHg
Wind21.7 mph SW
Humidity48%
Visibility—
Dew point38°
Fri, 2353° / 43°0Light rain
53 °Light rain

Big Sag, Friday, 23 October

Light rain. High 53°, low 43°.

Pressure30.00 inHg
Wind14.1 mph W
Humidity45%
Visibility—
Dew point29°
Sat, 2443° / 34°0Overcast
43 °Overcast

Big Sag, Saturday, 24 October

Overcast. High 43°, low 34°.

Pressure30.33 inHg
Wind11.7 mph SW
Humidity62%
Visibility—
Dew point28°
Sun, 2536° / 33°0.2Snow
36 °Snow

Big Sag, Sunday, 25 October

Snow. High 36°, low 33°.

Pressure30.30 inHg
Wind13.3 mph E
Humidity84%
Visibility—
Dew point31°
Mon, 2637° / 32°0.02Light snow
37 °Light snow

Big Sag, Monday, 26 October

Light snow. High 37°, low 32°.

Pressure30.18 inHg
Wind8 mph E
Humidity88%
Visibility—
Dew point32°
Tue, 2738° / 35°0.11Light snow
38 °Light snow

Big Sag, Tuesday, 27 October

Light snow. High 38°, low 35°.

Pressure29.83 inHg
Wind6.4 mph SE
Humidity91%
Visibility—
Dew point35°
Wed, 2842° / 34°0.17Snow
42 °Snow

Big Sag, Wednesday, 28 October

Snow. High 42°, low 34°.

Pressure29.68 inHg
Wind12.5 mph W
Humidity74%
Visibility—
Dew point32°
Thu, 2942° / 32°0Overcast
42 °Overcast

Big Sag, Thursday, 29 October

Overcast. High 42°, low 32°.

Pressure29.83 inHg
Wind14 mph W
Humidity55%
Visibility—
Dew point25°
Fri, 3040° / 30°0Overcast
40 °Overcast

Big Sag, Friday, 30 October

Overcast. High 40°, low 30°.

Pressure30.21 inHg
Wind13 mph W
Humidity55%
Visibility—
Dew point21°

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.