As of 05:15 MDT

Weather in Big Sag, MT

52°

Big Sag, Friday, 23 October, 05:15

Overcast. Feels like 50°. High 52°, low 29°.

Pressure29.62 inHg

Wind1.5 mph E

Humidity66%

Visibility6.2 mi

Dew point41°

See detailed hourly forecast

Sat, 2447° / 23°

47 °

Big Sag, Saturday, 24 October

Clear. High 47°, low 23°.

Pressure30.36 inHg

Wind6.2 mph E

Humidity62%

Visibility6.2 mi

Dew point22°

Sun, 2545° / 26°

45 °

Big Sag, Sunday, 25 October

Overcast. High 45°, low 26°.

Pressure30.47 inHg

Wind4.4 mph E

Humidity74%

Visibility6.2 mi

Dew point26°

Mon, 2649° / 27°

49 °

Big Sag, Monday, 26 October

Overcast. High 49°, low 27°.

Pressure30.27 inHg

Wind2.1 mph NE

Humidity75%

Visibility6.2 mi

Dew point28°

Tue, 2742° / 29°

0.01

42 °

Big Sag, Tuesday, 27 October

Light rain. High 42°, low 29°.

Pressure30.12 inHg

Wind11 mph SW

Humidity88%

Visibility—

Dew point33°

Wed, 2848° / 34°

0.06

48 °

Big Sag, Wednesday, 28 October

Snow. High 48°, low 34°.

Pressure30.42 inHg

Wind9.2 mph W

Humidity57%

Visibility—

Dew point29°

Thu, 2931° / 19°

31 °

Big Sag, Thursday, 29 October

Light snow. High 31°, low 19°.

Pressure30.33 inHg

Wind6 mph S

Humidity83%

Visibility—

Dew point23°

Fri, 3031° / 14°

31 °

Big Sag, Friday, 30 October

Overcast. High 31°, low 14°.

Pressure30.24 inHg

Wind5.3 mph SE

Humidity76%

Visibility—

Dew point20°

Sat, 3136° / 20°

36 °

Big Sag, Saturday, 31 October

Clear. High 36°, low 20°.

Pressure30.15 inHg

Wind6.4 mph S

Humidity79%

Visibility—

Dew point26°

Sun, 0137° / 24°

37 °

Big Sag, Sunday, 1 November

Clear. High 37°, low 24°.

Pressure30.27 inHg

Wind6.2 mph S

Humidity81%

Visibility—

Dew point29°

Mon, 0239° / 26°

39 °

Big Sag, Monday, 2 November

Clear. High 39°, low 26°.

Pressure30.39 inHg

Wind5.7 mph S

Humidity82%

Visibility—

Dew point31°

Tue, 0344° / 28°

44 °

Big Sag, Tuesday, 3 November

Clear. High 44°, low 28°.

Pressure30.30 inHg

Wind5.6 mph S

Humidity71%

Visibility—

Dew point30°

Wed, 0451° / 34°

51 °

Big Sag, Wednesday, 4 November

Clear. High 51°, low 34°.

Pressure30.06 inHg

Wind14.4 mph SW

Humidity55%

Visibility—

Dew point29°

Thu, 0553° / 42°

53 °

Big Sag, Thursday, 5 November

Overcast. High 53°, low 42°.

Pressure29.83 inHg

Wind23 mph SW

Humidity47%

Visibility—

Dew point30°

Fri, 0654° / 41°

54 °

Big Sag, Friday, 6 November

Partly cloudy. High 54°, low 41°.

Pressure30.00 inHg

Wind19.1 mph SW

Humidity58%

Visibility—

Dew point35°

Sat, 0748° / 38°

48 °

Big Sag, Saturday, 7 November

Partly cloudy. High 48°, low 38°.

Pressure30.33 inHg

Wind7.4 mph SW

Humidity63%

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.