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 >

Hazardous Weather Conditions

Current conditions at

Guam International Airport (PGUM)

Lat: 13.48°NLon: 144.8°EElev: 304ft.

A Few Clouds

80°F

27°C

Humidity 82%
Wind Speed SE 9 mph
Barometer 29.78 in (1007.8 mb)
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Heat Index85°F (29°C)
Last update 26 Dec 3:54 am ChST
Extended Forecast for

Dededo GU

High Surf Advisory until December 28, 04:00pm
Click here for hazard details and duration
High Surf Advisory
  •  
    High Surf Advisory until December 28, 04:00pm

    NOW until 4:00pm Sun

    High Surf Advisory

  • Overnight

    Low: 77 °F

    Isolated
    Showers

  • Friday

    Friday: Isolated showers. Mostly sunny, with a high near 86. East wind 8 to 11 mph.

    High: 86 °F

    Isolated
    Showers

  • Friday Night

    Friday Night: Isolated showers. Partly cloudy, with a low around 77. East wind 3 to 8 mph.

    Low: 77 °F

    Isolated
    Showers

  • Saturday

    Saturday: Isolated showers. Mostly sunny, with a high near 88. Light east wind increasing to 5 to 9 mph in the morning.

    High: 88 °F

    Isolated
    Showers

  • Saturday Night

    Saturday Night: Isolated showers. Partly cloudy, with a low around 77. East wind 7 to 9 mph.

    Low: 77 °F

    Isolated
    Showers

  • Sunday

    Sunday: Isolated showers. Mostly sunny, with a high near 89.

    High: 89 °F

    Isolated
    Showers

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 77.

    Low: 77 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 88.

    High: 88 °F

    Mostly Sunny

Detailed Forecast

Overnight
Isolated showers. Mostly cloudy, with a low around 77. East wind around 8 mph.
Friday
Isolated showers. Mostly sunny, with a high near 86. East wind 8 to 11 mph.
Friday Night
Isolated showers. Partly cloudy, with a low around 77. East wind 3 to 8 mph.
Saturday
Isolated showers. Mostly sunny, with a high near 88. Light east wind increasing to 5 to 9 mph in the morning.
Saturday Night
Isolated showers. Partly cloudy, with a low around 77. East wind 7 to 9 mph.
Sunday
Isolated showers. Mostly sunny, with a high near 89.
Sunday Night
Partly cloudy, with a low around 77.
Monday
Mostly sunny, with a high near 88.
Monday Night
Partly cloudy, with a low around 77.
Tuesday
Mostly sunny, with a high near 89.
Tuesday Night
Partly cloudy, with a low around 77.
Wednesday
Mostly sunny, with a high near 88.
Wednesday Night
Partly cloudy, with a low around 77.
New Year's Day
Mostly sunny, with a high near 89.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Dededo GU
 13.52°N 144.83°E
Last Update:
6:05 pm ChST Dec 25, 2025
Forecast Valid:
4am ChST Dec 26, 2025-6pm ChST Jan 1, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation