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CBS News 8 - San Diego, CA News Station - KFMB Channel 8 | cbs8.com

Cool Thanksgiving then dry Santa Ana winds pick up

Cooler temperatures through Thanksgiving with moderate strength Santa Ana winds Thursday evening through Saturday. Critical fire weather conditions expected.

SAN DIEGO — Wednesday afternoon high temperatures will be below seasonal norms.

  • Coastal highs 62°-68°, normal around 67°.
  • Inland highs 68°-71°, normal around 72°.
  • Mountain highs 55°-65°, normal around 56°.
  • Desert highs 71°-76°, normal around 73°.

At the beaches, water temperature is 57°-61° with a low rip current risk. Wave heights are 1'-3' from a northwest swell and a small southwest swell. The UV index will peak at 4 (moderate). 

Humidity in the County will be mild. Coastal and inland areas will see dew points 35°-55°. Mountain and desert dew points will be 25°-40°.

Air quality around San Diego County will be good to moderate. Forecast AQI values are 40-55 with PM2.5 being the primary pollutant.

FIRE WEATHER:

Credit: KFMB Weather

A Fire Weather Watch has been issued for San Diego County inland and mountain areas from 9 PM Thursday until 2 PM Saturday. Winds 20-30 mph with gusts 40-50 mph are expected. Wind prone locations could see gusts as high as 60 mph. Relative humidity levels will drop to below 10% Friday through Saturday. Winds will be weaker Sunday and Monday, but humidity remains very dry.

THE WEEK AHEAD:

Temperatures will begin to cool more into Thanksgiving Thursday as a low pressure trough digs into the Desert Southwest. Onshore flow will bring marine layer clouds back into the inland communities for the morning hours Thursday.

Credit: KFMB Weather
Cool high pressure will build bringing gusty and very dry conditions to Southern California.

Cold high pressure will build in the Great Basin Thursday evening, allowing a cool Santa Ana wind event to occur Thursday night through Saturday. Winds could gust 55-60 mph in the most wind prone locations. Winds will be fairly northerly Friday, then turn easterly Saturday. Easterly winds will favor San Diego County.

Slightly warmer conditions going into the weekend under dry offshore flow. Critical fire weather conditions are possible during the Santa Ana wind event. Winds will stay offshore but weaken through Monday and humidity will remain very low. 

Credit: KFMB Weather
Credit: KFMB Weather