National Weather Service Forecast for: Whitethorn CA
Issued by: National Weather Service Eureka, CA
Updated: 2:46 pm PDT Aug 19, 2026
 
Overnight

Overnight: Mostly clear, with a low around 54. Calm wind.
Mostly Clear

 Thursday

Thursday: Increasing clouds, with a high near 82. Light and variable wind.
Increasing
Clouds
 Thursday
Night
Thursday Night: Cloudy, with a low around 53. Light north wind.
Cloudy

 Friday

Friday: Cloudy through mid morning, then gradual clearing, with a high near 78. Light and variable wind.
Gradual
Clearing
 Friday
Night
Friday Night: Patchy fog after 5am. Otherwise, partly cloudy, with a low around 50. West wind around 5 mph becoming calm in the evening.
Mostly Clear
then Patchy
Fog
 Saturday

Saturday: Patchy fog before 8am. Otherwise, sunny, with a high near 84. Calm wind becoming west northwest around 6 mph in the afternoon.
Patchy Fog
then Sunny
 Saturday
Night
Saturday Night: Mostly clear, with a low around 53.
Mostly Clear

 Sunday

Sunday: Sunny, with a high near 86.
Sunny

 Sunday
Night
Sunday Night: Mostly clear, with a low around 54.
Mostly Clear
Lo 54 °F Hi 82 °F Lo 53 °F Hi 78 °F Lo 50 °F Hi 84 °F Lo 53 °F Hi 86 °F Lo 54 °F

 

Overnight
 
 Mostly clear, with a low around 54. Calm wind.
Thursday
 
 Increasing clouds, with a high near 82. Light and variable wind.
Thursday Night
 
 Cloudy, with a low around 53. Light north wind.
Friday
 
 Cloudy through mid morning, then gradual clearing, with a high near 78. Light and variable wind.
Friday Night
 
 Patchy fog after 5am. Otherwise, partly cloudy, with a low around 50. West wind around 5 mph becoming calm in the evening.
Saturday
 
 Patchy fog before 8am. Otherwise, sunny, with a high near 84. Calm wind becoming west northwest around 6 mph in the afternoon.
Saturday Night
 
 Mostly clear, with a low around 53.
Sunday
 
 Sunny, with a high near 86.
Sunday Night
 
 Mostly clear, with a low around 54.
Monday
 
 Mostly sunny, with a high near 79.
Monday Night
 
 Partly cloudy, with a low around 52.
Tuesday
 
 Mostly sunny, with a high near 79.
Tuesday Night
 
 Partly cloudy, with a low around 53.
Wednesday
 
 Mostly sunny, with a high near 83.

 

Forecast from NOAA-NWS for Whitethorn CA.