Fog Rolling In: San Diego County Weather Update With Cooler Temps And Possible Rain

Omar Yusuf

4 min read

Post on May 30, 2025

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Dense Fog Advisory and Impacts

The National Weather Service (NWS) has issued a dense fog advisory for San Diego County, impacting visibility and posing challenges for commuters and travelers. Areas most affected include coastal regions, valleys, and inland areas near the coast. Dense fog, with visibility significantly reduced, creates hazardous driving conditions.

• Reduced Visibility: Expect significantly reduced visibility, potentially down to a quarter mile or less in some areas. This leads to increased risk of traffic accidents and delays on freeways and roadways throughout San Diego County.
• Disruption of Outdoor Activities and Flights: Outdoor events and activities may be disrupted or cancelled due to poor visibility. Flights into and out of San Diego International Airport (SAN) may also experience delays or cancellations. Check with your airline for updates.
• Increased Risk of Hydroplaning: If rain accompanies the fog, the risk of hydroplaning increases dramatically. Drive with extra caution, maintaining a safe following distance and reducing speed. Use your headlights even during the day to improve visibility for other drivers.

Cooler Temperatures: A Departure from the Norm

San Diego residents are experiencing a notable drop in temperatures compared to the typical highs for this time of year. While average daytime temperatures usually hover in the mid-70s°F (low 20s°C), we're seeing a significant dip into the 60s°F (mid-teens°C) in many areas. This unexpected chill is largely attributed to a deeper than usual marine layer and the influence of a weather system moving across the region.

• Temperature Ranges: Expect daytime highs in the low to mid-60s°F (mid-teens°C), and nighttime lows in the 50s°F (low to mid-teens°C). These temperatures are significantly lower than the seasonal averages.
• Marine Layer Influence: The persistent marine layer is trapping cooler air near the coast, leading to widespread fog and lower temperatures.
• Weather Forecast: Monitor the latest San Diego temperature forecasts from reliable sources like the NWS for up-to-date information.

Chance of Rain: Is Precipitation Likely?

While the primary weather concern is the dense fog and cooler temperatures, there's also a chance of light rain in some parts of San Diego County. The probability of rain varies depending on location, with coastal areas and mountain regions having a slightly higher chance than inland areas.

• Rainfall Amounts: If rain does occur, amounts are expected to be light, likely less than a quarter inch.
• Areas Most Likely Affected: Coastal areas and higher elevations have a greater chance of experiencing precipitation.
• Potential Impacts: While widespread flooding is unlikely with light rain, low-lying areas could experience some localized ponding. Be aware of potential hazards on the roads due to reduced visibility and slick conditions. Check for San Diego rain forecasts frequently to stay informed.

Preparing for the Changing Weather Conditions

The combination of fog, cooler temperatures, and potential rain necessitates some adjustments to your routine. Preparing in advance ensures your safety and comfort during this unusual weather event.

• Driving in Foggy Conditions: Drive slowly, use your headlights, increase your following distance, and avoid sudden braking or acceleration. If visibility becomes severely limited, pull over to a safe location and wait for conditions to improve.
• Flight Travel: Check the status of your flight before heading to the airport, as delays or cancellations are possible due to low visibility.
• Power Outages: While not highly likely, strong winds associated with the weather system could cause power outages. Be prepared with flashlights, batteries, and other emergency supplies.
• Layering Clothing: Pack layers of clothing to adjust to the fluctuating temperatures throughout the day.

Conclusion: Staying Informed about San Diego County's Changing Weather

This San Diego weather update highlights the current conditions – dense fog, significantly cooler temperatures, and a chance of rain – urging residents to exercise caution and stay informed. It's crucial to monitor the latest forecasts and advisories from the National Weather Service and local news channels for updates on the San Diego weather. Stay safe and stay informed about the latest San Diego County weather updates to prepare for the fog and potential rain. Remember to check for any updated San Diego weather alerts or advisories before venturing out.