As of 21:24 MDT

Weather in Big Sag, MT

34°Current weather

Big Sag, Thursday, 29 October, 21:24

Overcast. Feels like 28°. High 37°, low 30°.

Pressure30.15 inHg
Wind6.8 mph NE
Humidity99%
Visibility6.2 mi
Dew point33°
Fri, 3040° / 30°0Overcast
40 °Overcast

Big Sag, Friday, 30 October

Overcast. High 40°, low 30°.

Pressure30.18 inHg
Wind3.1 mph E
Humidity85%
Visibility6.2 mi
Dew point33°
Sat, 3148° / 33°0Overcast
48 °Overcast

Big Sag, Saturday, 31 October

Overcast. High 48°, low 33°.

Pressure30.09 inHg
Wind1.6 mph NW
Humidity79%
Visibility6.2 mi
Dew point36°
Sun, 0146° / 34°0.37Rain
46 °Rain

Big Sag, Sunday, 1 November

Rain. High 46°, low 34°.

Pressure29.97 inHg
Wind6.1 mph NE
Humidity84%
Visibility6.2 mi
Dew point38°
Mon, 0250° / 39°0.27Light rain
50 °Light rain

Big Sag, Monday, 2 November

Light rain. High 50°, low 39°.

Pressure30.27 inHg
Wind7.2 mph W
Humidity77%
Visibility6.2 mi
Dew point36°
Tue, 0359° / 38°0Overcast
59 °Overcast

Big Sag, Tuesday, 3 November

Overcast. High 59°, low 38°.

Pressure30.12 inHg
Wind10.1 mph W
Humidity45%
Visibility—
Dew point30°
Wed, 0447° / 34°0Mostly clear
47 °Mostly clear

Big Sag, Wednesday, 4 November

Mostly clear. High 47°, low 34°.

Pressure30.18 inHg
Wind6.7 mph SW
Humidity61%
Visibility—
Dew point30°
Thu, 0547° / 36°0Overcast
47 °Overcast

Big Sag, Thursday, 5 November

Overcast. High 47°, low 36°.

Pressure29.85 inHg
Wind4.7 mph SE
Humidity59%
Visibility—
Dew point29°
Fri, 0651° / 39°0Overcast
51 °Overcast

Big Sag, Friday, 6 November

Overcast. High 51°, low 39°.

Pressure29.88 inHg
Wind3.9 mph S
Humidity49%
Visibility—
Dew point29°
Sat, 0753° / 39°0Mostly clear
53 °Mostly clear

Big Sag, Saturday, 7 November

Mostly clear. High 53°, low 39°.

Pressure29.91 inHg
Wind6.3 mph SE
Humidity50%
Visibility—
Dew point30°
Sun, 0852° / 40°0Overcast
52 °Overcast

Big Sag, Sunday, 8 November

Overcast. High 52°, low 40°.

Pressure29.80 inHg
Wind21.4 mph SW
Humidity42%
Visibility—
Dew point28°
Mon, 0950° / 36°0Clear
50 °Clear

Big Sag, Monday, 9 November

Clear. High 50°, low 36°.

Pressure29.97 inHg
Wind11.7 mph W
Humidity36%
Visibility—
Dew point19°
Tue, 1057° / 39°0Overcast
57 °Overcast

Big Sag, Tuesday, 10 November

Overcast. High 57°, low 39°.

Pressure29.62 inHg
Wind11.3 mph SW
Humidity37%
Visibility—
Dew point25°
Wed, 1149° / 38°0Overcast
49 °Overcast

Big Sag, Wednesday, 11 November

Overcast. High 49°, low 38°.

Pressure29.56 inHg
Wind24 mph SW
Humidity46%
Visibility—
Dew point28°
Thu, 1243° / 32°0Overcast
43 °Overcast

Big Sag, Thursday, 12 November

Overcast. High 43°, low 32°.

Pressure29.74 inHg
Wind14.6 mph SW
Humidity41%
Visibility—
Dew point19°
Fri, 1335° / 28°0Overcast
35 °Overcast

Big Sag, Friday, 13 November

Overcast. High 35°, low 28°.

Pressure29.91 inHg
Wind5.8 mph SW
Humidity75%
Visibility—
Dew point24°

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.