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As of 03:07 MDT

Weather in Big Sag, MT

33°Current weather

Big Sag, Friday, 16 October, 03:07

Clear. Feels like 33°. High 69°, low 33°.

Pressure30.53 inHg
Wind1.6 mph SE
Humidity77%
Visibility6.2 mi
Dew point27°
Sat, 1772° / 50°0Overcast
72 °Overcast

Big Sag, Saturday, 17 October

Overcast. High 72°, low 50°.

Pressure29.88 inHg
Wind18.7 mph SW
Humidity24%
Visibility6.2 mi
Dew point31°
Sun, 1863° / 46°0Clear
63 °Clear

Big Sag, Sunday, 18 October

Clear. High 63°, low 46°.

Pressure30.09 inHg
Wind5.7 mph NE
Humidity43%
Visibility6.2 mi
Dew point35°
Mon, 1963° / 41°0Overcast
63 °Overcast

Big Sag, Monday, 19 October

Overcast. High 63°, low 41°.

Pressure29.88 inHg
Wind4.5 mph NE
Humidity60%
Visibility6.2 mi
Dew point41°
Tue, 2058° / 43°0Overcast
58 °Overcast

Big Sag, Tuesday, 20 October

Overcast. High 58°, low 43°.

Pressure29.88 inHg
Wind7.7 mph W
Humidity65%
Visibility—
Dew point41°
Wed, 2164° / 39°0Clear
64 °Clear

Big Sag, Wednesday, 21 October

Clear. High 64°, low 39°.

Pressure30.09 inHg
Wind10.3 mph SE
Humidity70%
Visibility—
Dew point40°
Thu, 2269° / 53°0Clear
69 °Clear

Big Sag, Thursday, 22 October

Clear. High 69°, low 53°.

Pressure29.80 inHg
Wind16.9 mph SW
Humidity24%
Visibility—
Dew point26°
Fri, 2356° / 41°0.16Light rain
56 °Light rain

Big Sag, Friday, 23 October

Light rain. High 56°, low 41°.

Pressure29.77 inHg
Wind10.4 mph N
Humidity81%
Visibility—
Dew point45°
Sat, 2442° / 34°0.06Light snow
42 °Light snow

Big Sag, Saturday, 24 October

Light snow. High 42°, low 34°.

Pressure30.39 inHg
Wind9.5 mph N
Humidity68%
Visibility—
Dew point28°
Sun, 2551° / 32°0Clear
51 °Clear

Big Sag, Sunday, 25 October

Clear. High 51°, low 32°.

Pressure30.15 inHg
Wind11.6 mph SW
Humidity37%
Visibility—
Dew point20°
Mon, 2651° / 43°0.03Light rain
51 °Light rain

Big Sag, Monday, 26 October

Light rain. High 51°, low 43°.

Pressure29.91 inHg
Wind20.3 mph SW
Humidity43%
Visibility—
Dew point26°
Tue, 2749° / 39°0.01Light rain
49 °Light rain

Big Sag, Tuesday, 27 October

Light rain. High 49°, low 39°.

Pressure29.80 inHg
Wind6.3 mph SE
Humidity62%
Visibility—
Dew point32°
Wed, 2846° / 35°0.52Snow
46 °Snow

Big Sag, Wednesday, 28 October

Snow. High 46°, low 35°.

Pressure29.71 inHg
Wind8.5 mph NE
Humidity96%
Visibility—
Dew point38°
Thu, 2944° / 33°0.12Snow
44 °Snow

Big Sag, Thursday, 29 October

Snow. High 44°, low 33°.

Pressure29.94 inHg
Wind15.9 mph SW
Humidity71%
Visibility—
Dew point31°
Fri, 3049° / 38°0Overcast
49 °Overcast

Big Sag, Friday, 30 October

Overcast. High 49°, low 38°.

Pressure29.77 inHg
Wind28.3 mph SW
Humidity60%
Visibility—
Dew point33°
Sat, 3155° / 47°0Overcast
55 °Overcast

Big Sag, Saturday, 31 October

Overcast. High 55°, low 47°.

Pressure29.65 inHg
Wind22.7 mph W
Humidity49%
Visibility—
Dew point33°

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.