Fog Rolling In: San Diego County Weather Update

Hugo van Dijk

4 min read

Post on May 30, 2025

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Current Fog Conditions in San Diego County

Currently, a dense fog advisory is in effect for much of San Diego County. Coastal areas are experiencing the most significant impact, with visibility significantly reduced. Patchy fog is also reported in some inland valleys, but conditions are generally clearer there.

Specific areas heavily impacted include:

• Coastal communities such as La Jolla, Del Mar, Carlsbad, and Encinitas are experiencing the thickest fog.
• Visibility is currently:
  • La Jolla: Less than one mile.
  • Carlsbad: Approximately half a mile.
  • Inland areas (e.g., Escondido, Santee): 5-10 miles.

Driving conditions are hazardous in coastal areas due to significantly reduced visibility. Increased travel times are expected, and drivers are urged to exercise caution, reduce speed, and increase following distance. The National Weather Service has issued a fog advisory, urging drivers to use extra caution and avoid unnecessary travel in affected areas.

Causes and Formation of San Diego Fog

San Diego's famous fog is a result of the interaction between the warm, dry air from inland deserts and the cool, moist air above the Pacific Ocean. This phenomenon is known as the "marine layer."

• The Marine Layer: This is a layer of relatively cool, moist air that sits over the ocean. When pushed inland by prevailing winds, it creates ideal conditions for fog formation.
• Temperature Differences: The difference in temperature between the warm land and the cool ocean air is crucial. As the warm air rises, it cools, causing the moisture in the air to condense into tiny water droplets, forming fog.
• Time of Year: While fog can occur year-round in San Diego, it's most prevalent during the spring and summer months due to a combination of factors, including ocean temperatures and atmospheric pressure.

Impact of San Diego Fog on Daily Life

San Diego fog significantly impacts daily life in various ways:

• Morning Commutes and Transportation: Heavy fog can lead to significant delays on freeways and roads, causing congestion and increasing commute times. Public transportation may also experience delays.
• Outdoor Events and Activities: Outdoor events, including sporting events and concerts, may be delayed or cancelled due to poor visibility and safety concerns.
• Airport Delays: San Diego International Airport (SAN) often experiences delays or diversions due to low visibility caused by dense fog. Flights may be delayed or cancelled, leading to disruption for travelers.

Health concerns are also associated with heavy fog, particularly for those with respiratory problems like asthma or allergies. The increased moisture and pollutants trapped in the fog can trigger respiratory symptoms. Economically, heavy fog can impact tourism, as outdoor activities are curtailed, and shipping may face delays.

Forecasting San Diego Fog: What to Expect

The short-term forecast predicts a gradual dissipation of the fog over the next 24-48 hours. We expect the fog to begin burning off from coastal areas by late morning tomorrow, with inland areas clearing sooner.

• Expected Fog Burn-Off: Expect the fog to lift gradually, starting in the eastern areas first.
• Areas with Prolonged Fog: Coastal communities may experience lingering fog patches throughout the day.

For the most accurate and up-to-the-minute San Diego fog forecast, please check reputable sources like the National Weather Service and local news channels.

Conclusion

San Diego's current fog conditions are impacting coastal areas most significantly, with reduced visibility leading to hazardous driving conditions and potential delays in travel and outdoor activities. The fog is expected to dissipate gradually over the next 48 hours, but some coastal areas may experience lingering fog patches. The primary cause is the interaction of the marine layer with warmer inland air. Stay updated on the latest San Diego fog conditions by regularly checking reputable weather sources for the most accurate San Diego fog forecast. Be prepared for reduced visibility and plan accordingly. For detailed information and up-to-the-minute updates on San Diego fog, continue to monitor weather reports throughout the day.