National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Atmospheric River Bringing Heavy Rain to Southern California and Heavy Snow to the Sierra Nevadas

A strong atmospheric river will continue heavy rain over southern California through Friday. The heaviest rainfall is ongoing today in the Los Angeles Basin. Flash and urban flooding is possible. A prolonged heavy snowfall has begun over the Sierra Nevada Mountains and will continue through Friday. Travel will become increasingly difficult over the passes due to snow and strong winds. Read More >

Current conditions at

TROY (TROM8)

Lat: 48.48165°NLon: 115.90507°WElev: 2009.0ft.

NA

38°F

3°C

Humidity 100%
Wind Speed NNW 1 MPH
Barometer NA
Dewpoint 38°F (3°C)
Visibility NA
Last update 24 Dec 10:07 PM MST
Extended Forecast for

4 Miles S Troy MT

  • Tonight

    Tonight: A 40 percent chance of rain, mainly before 11pm. Cloudy, then gradually becoming partly cloudy, with a low around 35. Calm wind.

    Low: 35 °F

    Chance Rain
    then Mostly
    Cloudy

  • Christmas Day

    Christmas Day: Rain likely, mainly after 3pm. Snow level 3500 feet rising to 5200 feet in the afternoon. Mostly cloudy, with a high near 42. Calm wind. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

    High: 42 °F

    Slight Chance
    Rain then
    Rain Likely

  • Thursday Night

    Thursday Night: Rain. Low around 35. Light south wind. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 35 °F

    Rain

  • Friday

    Friday: Rain before 2pm, then rain and snow. Snow level 3300 feet. High near 41. South southwest wind 3 to 6 mph. Chance of precipitation is 100%. New snow accumulation of less than a half inch possible.

    High: 41 °F

    Rain then
    Rain/Snow

  • Friday Night

    Friday Night: Rain and snow, becoming all snow after 8pm. Low around 23. Southwest wind 6 to 9 mph, with gusts as high as 24 mph. Chance of precipitation is 100%. New snow accumulation of 1 to 3 inches possible.

    Low: 23 °F

    Rain/Snow
    then Snow
    Likely

  • Saturday

    Saturday: A 40 percent chance of snow before 11am. Mostly sunny, with a high near 31. New snow accumulation of less than a half inch possible.

    High: 31 °F

    Chance Snow
    then Mostly
    Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 14.

    Low: 14 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 30.

    High: 30 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 20.

    Low: 20 °F

    Mostly Cloudy

Detailed Forecast

Tonight
A 40 percent chance of rain, mainly before 11pm. Cloudy, then gradually becoming partly cloudy, with a low around 35. Calm wind.
Christmas Day
Rain likely, mainly after 3pm. Snow level 3500 feet rising to 5200 feet in the afternoon. Mostly cloudy, with a high near 42. Calm wind. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Thursday Night
Rain. Low around 35. Light south wind. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday
Rain before 2pm, then rain and snow. Snow level 3300 feet. High near 41. South southwest wind 3 to 6 mph. Chance of precipitation is 100%. New snow accumulation of less than a half inch possible.
Friday Night
Rain and snow, becoming all snow after 8pm. Low around 23. Southwest wind 6 to 9 mph, with gusts as high as 24 mph. Chance of precipitation is 100%. New snow accumulation of 1 to 3 inches possible.
Saturday
A 40 percent chance of snow before 11am. Mostly sunny, with a high near 31. New snow accumulation of less than a half inch possible.
Saturday Night
Mostly cloudy, with a low around 14.
Sunday
Partly sunny, with a high near 30.
Sunday Night
Mostly cloudy, with a low around 20.
Monday
Mostly cloudy, with a high near 35.
Monday Night
Mostly cloudy, with a low around 23.
Tuesday
Mostly cloudy, with a high near 38.
Tuesday Night
Mostly cloudy, with a low around 25.
Wednesday
A slight chance of rain and snow. Snow level rising to 3300 feet in the afternoon. Mostly sunny, with a high near 39.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles S Troy MT
 48.4°N 115.9°W (Elev. 2667 ft)
Last Update:
1:02 pm MST Dec 24, 2025
Forecast Valid:
10pm MST Dec 24, 2025-6pm MST Dec 31, 2025
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation