Eureka, CA Weather Alert: Early Fog and Light Rain Give Way to Clear, Cool December Days

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Eureka, CA – The North Coast wakes to wet pavement and a low, gray sky this morning as a light drizzle moves through Humboldt Bay. Fog hangs thick over the harbor, softening the glow of early headlights and slowing morning commutes along U.S. 101.

According to the National Weather Service in Eureka, a slight chance of rain continues through midmorning Friday, with patchy fog persisting until about 9 a.m. Skies gradually clear by late morning as weak high pressure builds along the Pacific. Temperatures will reach the mid-50s today, followed by another cool, calm night near 42°F.

Saturday brings brighter conditions, with mostly sunny skies and highs around 55°F — ideal for travelers wrapping up the holiday week or heading inland. Winds stay light, but coastal areas may feel a cool sea breeze by afternoon. Sunday follows suit with partly sunny skies and dry air, marking a steady start to early December weather along the far Northern California coast.

By midweek, another Pacific system could brush the region, but forecasters say most of the rain should stay offshore. Cooler, drier air will likely linger into early December — a winter tease before stronger systems develop later next week across the Pacific Northwest.

Travelers along the coast should watch for early fog and slick roadways, especially during morning drives or late-night returns.

Noticing fog along the bay or light drizzle near Fortuna? Share your local conditions with us below.


Five-Day Outlook for Eureka, CA:

  • Friday: Slight chance of rain and fog early, high 56°F; low 42°F.
  • Saturday: Mostly sunny, high 55°F; low 43°F.
  • Sunday: Partly sunny, high 56°F; low 38°F.
  • Monday: Mostly sunny, high 58°F; low 45°F.
  • Tuesday: Partly sunny, high 57°F.