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As of 09:34 MDT

Weather in Big Sag, MT

54°Current weather

Big Sag, Saturday, 17 October, 09:34

Overcast. Feels like 51°. High 74°, low 46°.

Pressure29.94 inHg
Wind17.1 mph SW
Humidity34%
Visibility6.2 mi
Dew point27°
Sun, 1860° / 37°0Overcast
60 °Overcast

Big Sag, Sunday, 18 October

Overcast. High 60°, low 37°.

Pressure30.15 inHg
Wind8.2 mph E
Humidity48%
Visibility6.2 mi
Dew point36°
Mon, 1965° / 37°0Clear
65 °Clear

Big Sag, Monday, 19 October

Clear. High 65°, low 37°.

Pressure29.94 inHg
Wind3.7 mph NE
Humidity53%
Visibility6.2 mi
Dew point39°
Tue, 2056° / 40°0Overcast
56 °Overcast

Big Sag, Tuesday, 20 October

Overcast. High 56°, low 40°.

Pressure30.12 inHg
Wind6.7 mph W
Humidity64%
Visibility6.2 mi
Dew point40°
Wed, 2164° / 41°0Partly cloudy
64 °Partly cloudy

Big Sag, Wednesday, 21 October

Partly cloudy. High 64°, low 41°.

Pressure30.06 inHg
Wind7.9 mph E
Humidity67%
Visibility—
Dew point42°
Thu, 2269° / 49°0Mostly clear
69 °Mostly clear

Big Sag, Thursday, 22 October

Mostly clear. High 69°, low 49°.

Pressure29.83 inHg
Wind5.5 mph NE
Humidity52%
Visibility—
Dew point44°
Fri, 2352° / 43°0.29Light rain
52 °Light rain

Big Sag, Friday, 23 October

Light rain. High 52°, low 43°.

Pressure29.83 inHg
Wind7.7 mph N
Humidity70%
Visibility—
Dew point39°
Sat, 2452° / 38°0Partly cloudy
52 °Partly cloudy

Big Sag, Saturday, 24 October

Partly cloudy. High 52°, low 38°.

Pressure30.09 inHg
Wind7.8 mph SE
Humidity56%
Visibility—
Dew point31°
Sun, 2557° / 44°0Overcast
57 °Overcast

Big Sag, Sunday, 25 October

Overcast. High 57°, low 44°.

Pressure29.74 inHg
Wind4.7 mph SE
Humidity55%
Visibility—
Dew point36°
Mon, 2649° / 37°0.23Snow
49 °Snow

Big Sag, Monday, 26 October

Snow. High 49°, low 37°.

Pressure29.59 inHg
Wind26.8 mph SW
Humidity79%
Visibility—
Dew point35°
Tue, 2750° / 41°0.01Light rain
50 °Light rain

Big Sag, Tuesday, 27 October

Light rain. High 50°, low 41°.

Pressure29.44 inHg
Wind26.2 mph W
Humidity43%
Visibility—
Dew point28°
Wed, 2850° / 39°0Partly cloudy
50 °Partly cloudy

Big Sag, Wednesday, 28 October

Partly cloudy. High 50°, low 39°.

Pressure29.85 inHg
Wind24.4 mph SW
Humidity37%
Visibility—
Dew point20°
Thu, 2947° / 34°0Overcast
47 °Overcast

Big Sag, Thursday, 29 October

Overcast. High 47°, low 34°.

Pressure29.68 inHg
Wind16 mph SW
Humidity49%
Visibility—
Dew point27°
Fri, 3032° / 27°0.26Snow
32 °Snow

Big Sag, Friday, 30 October

Snow. High 32°, low 27°.

Pressure30.00 inHg
Wind8.5 mph N
Humidity88%
Visibility—
Dew point26°
Sat, 3139° / 25°0.01Light snow
39 °Light snow

Big Sag, Saturday, 31 October

Light snow. High 39°, low 25°.

Pressure29.71 inHg
Wind15.1 mph SW
Humidity61%
Visibility—
Dew point23°
Sun, 0142° / 28°0Partly cloudy
42 °Partly cloudy

Big Sag, Sunday, 1 November

Partly cloudy. High 42°, low 28°.

Pressure29.88 inHg
Wind5.8 mph S
Humidity62%
Visibility—
Dew point27°

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.