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As of 10:41 MDT

Weather in Big Sag, MT

55°Current weather

Big Sag, Thursday, 22 October, 10:41

Clear. Feels like 53°. High 71°, low 40°.

Pressure29.88 inHg
Wind2.6 mph N
Humidity62%
Visibility6.2 mi
Dew point42°
Fri, 2348° / 30°0.59Snow
48 °Snow

Big Sag, Friday, 23 October

Snow. High 48°, low 30°.

Pressure29.88 inHg
Wind13.4 mph NW
Humidity91%
Visibility1.7 mi
Dew point40°
Sat, 2448° / 27°0Clear
48 °Clear

Big Sag, Saturday, 24 October

Clear. High 48°, low 27°.

Pressure30.33 inHg
Wind5.3 mph E
Humidity63%
Visibility6.2 mi
Dew point24°
Sun, 2544° / 27°0Partly cloudy
44 °Partly cloudy

Big Sag, Sunday, 25 October

Partly cloudy. High 44°, low 27°.

Pressure30.45 inHg
Wind5 mph E
Humidity71%
Visibility6.2 mi
Dew point26°
Mon, 2649° / 27°0Overcast
49 °Overcast

Big Sag, Monday, 26 October

Overcast. High 49°, low 27°.

Pressure30.33 inHg
Wind7.6 mph E
Humidity72%
Visibility—
Dew point30°
Tue, 2740° / 33°0.13Light rain
40 °Light rain

Big Sag, Tuesday, 27 October

Light rain. High 40°, low 33°.

Pressure30.06 inHg
Wind6.8 mph W
Humidity79%
Visibility—
Dew point33°
Wed, 2836° / 24°0.72Snow
36 °Snow

Big Sag, Wednesday, 28 October

Snow. High 36°, low 24°.

Pressure30.50 inHg
Wind12 mph NW
Humidity88%
Visibility—
Dew point27°
Thu, 2937° / 21°0Clear
37 °Clear

Big Sag, Thursday, 29 October

Clear. High 37°, low 21°.

Pressure30.18 inHg
Wind6.2 mph S
Humidity81%
Visibility—
Dew point28°
Fri, 3045° / 31°0Overcast
45 °Overcast

Big Sag, Friday, 30 October

Overcast. High 45°, low 31°.

Pressure29.77 inHg
Wind15.7 mph SW
Humidity95%
Visibility—
Dew point40°
Sat, 3147° / 37°0Overcast
47 °Overcast

Big Sag, Saturday, 31 October

Overcast. High 47°, low 37°.

Pressure29.80 inHg
Wind15.8 mph SW
Humidity69%
Visibility—
Dew point34°
Sun, 0150° / 34°0Overcast
50 °Overcast

Big Sag, Sunday, 1 November

Overcast. High 50°, low 34°.

Pressure29.94 inHg
Wind17 mph SW
Humidity54%
Visibility—
Dew point29°
Mon, 0255° / 43°0Partly cloudy
55 °Partly cloudy

Big Sag, Monday, 2 November

Partly cloudy. High 55°, low 43°.

Pressure30.15 inHg
Wind17.7 mph SW
Humidity41%
Visibility—
Dew point27°
Tue, 0367° / 46°0Clear
67 °Clear

Big Sag, Tuesday, 3 November

Clear. High 67°, low 46°.

Pressure29.91 inHg
Wind9.3 mph S
Humidity28%
Visibility—
Dew point25°
Wed, 0462° / 48°0Mostly clear
62 °Mostly clear

Big Sag, Wednesday, 4 November

Mostly clear. High 62°, low 48°.

Pressure29.80 inHg
Wind11.8 mph W
Humidity26%
Visibility—
Dew point25°
Thu, 0564° / 50°0Partly cloudy
64 °Partly cloudy

Big Sag, Thursday, 5 November

Partly cloudy. High 64°, low 50°.

Pressure29.74 inHg
Wind15.6 mph SW
Humidity28%
Visibility—
Dew point28°
Fri, 0667° / 53°0Overcast
67 °Overcast

Big Sag, Friday, 6 November

Overcast. High 67°, low 53°.

Pressure29.68 inHg
Wind15.7 mph SW
Humidity40%
Visibility—
Dew point37°

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.