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As of 22:44 MDT

Weather in Big Sag, MT

48°Current weather

Big Sag, Sunday, 18 October, 22:44

Clear. Feels like 48°. High 60°, low 39°.

Pressure30.03 inHg
Wind1.3 mph S
Humidity53%
Visibility6.2 mi
Dew point32°
Mon, 1970° / 44°0Overcast
70 °Overcast

Big Sag, Monday, 19 October

Overcast. High 70°, low 44°.

Pressure29.91 inHg
Wind3.1 mph NE
Humidity51%
Visibility6.2 mi
Dew point39°
Tue, 2057° / 41°0Overcast
57 °Overcast

Big Sag, Tuesday, 20 October

Overcast. High 57°, low 41°.

Pressure30.15 inHg
Wind3.5 mph NW
Humidity61%
Visibility6.2 mi
Dew point39°
Wed, 2165° / 38°0Mostly clear
65 °Mostly clear

Big Sag, Wednesday, 21 October

Mostly clear. High 65°, low 38°.

Pressure30.03 inHg
Wind4 mph NE
Humidity63%
Visibility6.2 mi
Dew point43°
Thu, 2269° / 50°0Clear
69 °Clear

Big Sag, Thursday, 22 October

Clear. High 69°, low 50°.

Pressure29.88 inHg
Wind4.2 mph N
Humidity59%
Visibility6.2 mi
Dew point47°
Fri, 2355° / 46°0.3Light rain
55 °Light rain

Big Sag, Friday, 23 October

Light rain. High 55°, low 46°.

Pressure29.62 inHg
Wind16.6 mph SW
Humidity92%
Visibility—
Dew point50°
Sat, 2449° / 40°0.07Light rain
49 °Light rain

Big Sag, Saturday, 24 October

Light rain. High 49°, low 40°.

Pressure30.15 inHg
Wind17.4 mph SW
Humidity48%
Visibility—
Dew point28°
Sun, 2548° / 37°0.03Snow
48 °Snow

Big Sag, Sunday, 25 October

Snow. High 48°, low 37°.

Pressure30.00 inHg
Wind15.1 mph NW
Humidity49%
Visibility—
Dew point27°
Mon, 2653° / 35°0Clear
53 °Clear

Big Sag, Monday, 26 October

Clear. High 53°, low 35°.

Pressure30.03 inHg
Wind7.2 mph SE
Humidity50%
Visibility—
Dew point28°
Tue, 2754° / 41°0Partly cloudy
54 °Partly cloudy

Big Sag, Tuesday, 27 October

Partly cloudy. High 54°, low 41°.

Pressure29.80 inHg
Wind5.4 mph NE
Humidity41%
Visibility—
Dew point27°
Wed, 2852° / 41°0.03Light rain
52 °Light rain

Big Sag, Wednesday, 28 October

Light rain. High 52°, low 41°.

Pressure29.56 inHg
Wind5.1 mph NE
Humidity51%
Visibility—
Dew point31°
Thu, 2943° / 28°1.05Snow
43 °Snow

Big Sag, Thursday, 29 October

Snow. High 43°, low 28°.

Pressure29.56 inHg
Wind15.1 mph NW
Humidity99%
Visibility—
Dew point35°
Fri, 3033° / 18°0.2Snow
33 °Snow

Big Sag, Friday, 30 October

Snow. High 33°, low 18°.

Pressure30.00 inHg
Wind14.9 mph NW
Humidity76%
Visibility—
Dew point21°
Sat, 3139° / 23°0Overcast
39 °Overcast

Big Sag, Saturday, 31 October

Overcast. High 39°, low 23°.

Pressure29.91 inHg
Wind27 mph SW
Humidity74%
Visibility—
Dew point27°
Sun, 0145° / 33°0.02Light snow
45 °Light snow

Big Sag, Sunday, 1 November

Light snow. High 45°, low 33°.

Pressure29.80 inHg
Wind25.2 mph SW
Humidity77%
Visibility—
Dew point34°
Mon, 0244° / 32°0.01Light rain
44 °Light rain

Big Sag, Monday, 2 November

Light rain. High 44°, low 32°.

Pressure29.50 inHg
Wind16.6 mph SW
Humidity79%
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.