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As of 19:45 MDT

Weather in Big Sag, MT

79°Current weather

Big Sag, Saturday, 8 August, 19:45

Partly cloudy. Feels like 79°. High 83°, low 52°.

Pressure29.85 inHg
Wind8.2 mph NE
Humidity27%
Visibility6.2 mi
Dew point42°
Sun, 0981° / 50°0Clear
81 °Clear

Big Sag, Sunday, 9 August

Clear. High 81°, low 50°.

Pressure29.94 inHg
Wind11.3 mph W
Humidity38%
Visibility6.2 mi
Dew point47°
Mon, 1087° / 46°0Clear
87 °Clear

Big Sag, Monday, 10 August

Clear. High 87°, low 46°.

Pressure29.85 inHg
Wind6.4 mph NW
Humidity26%
Visibility6.2 mi
Dew point41°
Tue, 1185° / 61°0Clear
85 °Clear

Big Sag, Tuesday, 11 August

Clear. High 85°, low 61°.

Pressure29.94 inHg
Wind9 mph NW
Humidity31%
Visibility6.2 mi
Dew point44°
Wed, 1287° / 62°0Light rain
87 °Light rain

Big Sag, Wednesday, 12 August

Light rain. High 87°, low 62°.

Pressure29.85 inHg
Wind5.3 mph W
Humidity25%
Visibility6.2 mi
Dew point40°
Thu, 1381° / 57°0.05Light rain
81 °Light rain

Big Sag, Thursday, 13 August

Light rain. High 81°, low 57°.

Pressure29.85 inHg
Wind9.9 mph SW
Humidity46%
Visibility—
Dew point50°
Fri, 1472° / 58°0.07Light rain
72 °Light rain

Big Sag, Friday, 14 August

Light rain. High 72°, low 58°.

Pressure30.09 inHg
Wind11.6 mph NE
Humidity61%
Visibility—
Dew point50°
Sat, 1583° / 54°0.01Light rain
83 °Light rain

Big Sag, Saturday, 15 August

Light rain. High 83°, low 54°.

Pressure30.12 inHg
Wind10.7 mph E
Humidity42%
Visibility—
Dew point47°
Sun, 1693° / 62°0Mostly clear
93 °Mostly clear

Big Sag, Sunday, 16 August

Mostly clear. High 93°, low 62°.

Pressure29.94 inHg
Wind16.9 mph NW
Humidity22%
Visibility—
Dew point40°
Mon, 1790° / 67°0Overcast
90 °Overcast

Big Sag, Monday, 17 August

Overcast. High 90°, low 67°.

Pressure29.94 inHg
Wind11.2 mph N
Humidity24%
Visibility—
Dew point40°
Tue, 1878° / 61°0.06Light rain
78 °Light rain

Big Sag, Tuesday, 18 August

Light rain. High 78°, low 61°.

Pressure30.15 inHg
Wind10.2 mph W
Humidity84%
Visibility—
Dew point57°
Wed, 1986° / 64°0.01Light rain
86 °Light rain

Big Sag, Wednesday, 19 August

Light rain. High 86°, low 64°.

Pressure29.88 inHg
Wind20 mph W
Humidity29%
Visibility—
Dew point44°
Thu, 2088° / 63°0Overcast
88 °Overcast

Big Sag, Thursday, 20 August

Overcast. High 88°, low 63°.

Pressure29.83 inHg
Wind24 mph SW
Humidity22%
Visibility—
Dew point38°
Fri, 2182° / 63°0.02Light rain
82 °Light rain

Big Sag, Friday, 21 August

Light rain. High 82°, low 63°.

Pressure29.83 inHg
Wind13.3 mph NW
Humidity32%
Visibility—
Dew point42°
Sat, 2283° / 54°0Clear
83 °Clear

Big Sag, Saturday, 22 August

Clear. High 83°, low 54°.

Pressure29.91 inHg
Wind11.5 mph NE
Humidity34%
Visibility—
Dew point43°
Sun, 2390° / 62°0Overcast
90 °Overcast

Big Sag, Sunday, 23 August

Overcast. High 90°, low 62°.

Pressure29.71 inHg
Wind19 mph NW
Humidity13%
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.