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Current conditions at

Sieben I-15 MP 216 (MTSBN)

Lat: 46.88748267° N Lon: 112.1111196° W Elev: 4199.0 ft.

NA

10°F

-12°C

Humidity 76%
Wind Speed N 14 MPH
Barometer NA
Dewpoint 4°F (-16°C)
Visibility NA
Wind Chill-6°F (-21°C)
Last update 22 Jan 08:00 PM MST
Detailed forecast for

Upper Blackfoot and MacDonald Pass

Tonight
Colder. Mostly cloudy. Slight chance of snow in the late evening and early morning. Chance of snow late in the night. Lows around 1 below. Northeast winds 5 to 15 mph with gusts to around 30 mph. Chance of snow 40 percent.
Friday
Mostly cloudy in the morning then clearing. Highs 5 to 13. Northeast winds up to 10 mph with gusts to around 25 mph.
Friday Night
Mostly clear in the evening then becoming mostly cloudy. Near steady temperature around 3. Southwest winds up to 5 mph.
Saturday
Not as cold. Partly sunny. Slight chance of snow in the morning, then chance of snow in the afternoon. Highs 12 to 20. West winds up to 10 mph. Chance of snow 40 percent.
Saturday Night
Mostly cloudy. Chance of snow in the evening, then slight chance of snow after midnight. Lows around 4. Northwest winds up to 10 mph with gusts to around 25 mph. Chance of snow 40 percent.
Sunday And Sunday Night
Partly cloudy. Highs 20 to 28. Lows around 14.
Monday
Mostly sunny. Highs 26 to 34.
Monday Night Through Tuesday Night
Mostly cloudy. Lows in the lower 20s. Highs 28 to 36.
Wednesday Through Thursday
Mostly cloudy with a 20 percent chance of snow. Highs 27 to 36. Lows around 20.



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438 PM MST Thu Jan 22 2026
 
 

Additional Resources

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