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Updated:January 7, 2026 1:15 pm PST

Extreme Cold Watch EXTREME COLD WATCH  
Napa County

  Effective: Wed, 1/7 8:58am Severity:  Extreme 
  Updated: January 7, 2026 1:15 pm Urgency: Future
  Expires: Wed, 1/7 8:00pm Certainty: Likely

Areas Affected: Marin Coastal Range - North Bay Interior Valleys - San Francisco Bay Shoreline - East Bay Interior Valleys - Santa Cruz Mountains - Santa Clara Valley Including San Jose - Eastern Santa Clara Hills - East Bay Hills - Southern Salinas Valley/Arroyo Seco and Lake San Antonio - Santa Lucia Mountains and Los Padres National Forest - Mountains Of San Benito County And Interior Monterey County Including Pinnacles National Park - Northern Salinas Valley/Hollister Valley and Carmel Valley - Northern Monterey Bay - Southern Monterey Bay and Big Sur Coast
 
Alert Details:
* WHAT...Very cold conditions with temperatures in the low to mid 30s
possible except for Interior Monterey and San Benito Counties where
temperatures in the upper 20s are possible.

* WHERE...The East Bay and San Francisco Bay Shoreline, The Central
Coast, The Santa Clara Valley and Eastern Hills, The Salinas and
Carmel Valleys and Hollister Area, The Marin Hills, The Santa Cruz
Mountains, and North Bay Interior Valleys.

* WHEN...From late Thursday night through Friday morning.

* IMPACTS...Cold conditions will be hazardous to sensitive
populations such as unhoused individuals. Cold conditions may
damage or kill sensitive crops, plants, and vegetation if
appropriate precautions are not taken. Prolonged exposure to the
cold conditions will lead to hypothermia for people, pets, and
livestock.

Information:
Ensure portable heaters are working properly and are used correctly
to avoid sparking a fire indoors. Do not use generators or grills
inside as carbon monoxide poisoning can result.

Check with your local, city, or county officials for information on
available warming centers.

Be sure to dress in layers if outdoors. Make sure that pets and
livestock have adequate food, unfrozen water, and warmth. Cover or
tend to sensitive crops, plants, and vegetation.