America Weather Forecast Today: December 23

As the world marks the holiday season, weather patterns across the United States on December 23, 2025, show stark regional contrasts. A persistent atmospheric river continues to deliver heavy rain and mountain snow to the West Coast, triggering flood risks in California. Meanwhile, light snow affects the Northeast, with winter advisories in place, and unusually mild conditions dominate the South and Central regions ahead of a potentially record-warm Christmas in some areas. This comprehensive US weather forecast provides state-by-state overviews and major city conditions to keep travelers and residents informed.

US National Weather Summary: Active Alerts and Key Patterns

• Western US: Strong atmospheric river fueling heavy rainfall and Sierra Nevada snow. Moderate to high risk of excessive rainfall, flash flooding, mudslides, and rockslides in California.
• Northeast: Light snow and wintry mix overnight into Tuesday, with winter weather advisories across parts of NY, NJ, CT, and surrounding areas (1-3 inches possible inland).
• Midwest & North: Bitter cold in northern tiers; lake-effect snow possible.
• South & Central: Mild to warm, with temperatures 10-15°F above average in many spots, setting stage for a warmer-than-normal holiday.
• Holiday Travel Impact: Potential delays from West Coast flooding/rain, Northeast snow, and mountain snow. TSA anticipates record passenger volumes through early January.

State-by-State Weather Overview (December 23, 2025)

Regional highlights based on latest National Weather Service and NOAA data:

Western States:

• California: Heavy rain statewide, heaviest in northern/central areas and shifting south. High risk of urban flash flooding; Sierra Nevada heavy snow (several feet at higher elevations). Flood watches and high wind warnings active.
• Oregon/Washington: Scattered showers lingering; cooler.
• Alaska: Frigid temperatures; scattered snow.
• Hawaii: Stable trades; mostly dry.

Northeastern States:

• New York, New Jersey, Connecticut: Light accumulating snow (1-3+ inches inland); winter weather advisories in multiple counties (e.g., Westchester, Bergen, Ulster).
• Maine: Bitterly cold; existing snowpack ensures white ground cover.
• Pennsylvania, Massachusetts: Wintry mix or light snow; slick conditions possible.

Midwestern States:

• Illinois, Michigan, Ohio: Cold with flurries or lake-effect snow bands.

Southern States:

• Texas, Florida, Georgia, Alabama: Mild and mostly dry; some clouds or isolated showers.

Central/Plains States:

• Dry but cold; wind chills in northern areas.

Major US City Forecasts (December 23, 2025)

Approximate highs/lows and conditions:

• New York City, NY: Light snow overnight; highs mid-30s to low 40s°F; possible slick commute.
• Los Angeles, CA: Rain likely; highs low 60s°F; flood risks nearby.
• San Francisco, CA: Heavy rain; highs mid-50s°F; urban flooding potential.
• Chicago, IL: Cold and cloudy; highs low 30s°F; flurries possible.
• Houston, TX: Mild; highs low 70s°F; partly cloudy.
• Miami, FL: Warm; highs mid-70s°F; sunny intervals.
• Boston, MA: Light snow accumulation; highs mid-30s°F.
• Washington, D.C.: Chilly; highs low 40s°F; mostly dry.
• Seattle, WA: Showers; highs upper 40s°F.
• Denver, CO: Cold; highs upper 30s°F.
• Atlanta, GA: Mild; highs mid-60s°F.
• Phoenix, AZ: Pleasant; highs low 70s°F.

International Context and Holiday Weather Outlook

While the US experiences mixed winter conditions, global patterns show a building high-pressure ridge driving warmer air into central and southern states—potentially leading to one of the warmest Christmases on record in parts of the Midwest and South. Northern areas retain chances for traditional snow.

Travelers worldwide heading to or from the US should monitor delays, especially on West Coast routes and Northeast airports.