San Diego, January 22, 2026
A Dense Fog Advisory is currently in effect for San Diego County’s coastal areas and inland valleys until 9:00 AM PST. Residents should be cautious as visibility may drop to one-quarter mile or less, leading to hazardous driving conditions. The advisory encourages drivers to slow down, use low-beam headlights, and maintain a safe following distance. After the advisory, the weather is expected to be mostly cloudy with a chance of showers, and temperatures will reach the mid-60s°F.
Dense Fog Advisory Issued for San Diego on January 22, 2026
San Diego, CA – A Dense Fog Advisory is currently in effect this morning until 9:00 AM PST for San Diego County’s coastal areas and inland valleys. Residents and commuters should exercise caution as reduced visibility could lead to hazardous driving conditions.
Advisory Details
- What: Areas of dense fog with visibility of one-quarter mile or less.
- Where: San Diego County Coastal Areas and Inland Valleys, including higher coastal terrain and western portions of the inland valleys.
- When: Until 9:00 AM PST this morning.
- Impacts: Low visibility may make driving conditions hazardous.
Safety Recommendations
If you must travel during the advisory period, please follow these precautions:
- Slow down: Reduce your speed to accommodate limited visibility.
- Use headlights: Turn on your vehicle’s low-beam headlights to increase your visibility to others.
- Increase following distance: Maintain a safe distance between your vehicle and others to allow for sudden stops.
Weather Forecast
Following the advisory, expect mostly cloudy skies throughout the day, with a slight chance of showers in the afternoon and evening hours. High temperatures are anticipated to reach the mid-60s°F (around 18°C) and lows in the mid-50s°F (around 12°C). Light winds are expected, ranging from 5 to 10 mph.
Background Information
Dense fog advisories are issued when widespread fog reduces visibility to one-quarter mile or less, increasing the risk of traffic accidents. In San Diego, such advisories are most prevalent in the winter months, particularly from November through February. The phenomenon is often attributed to a marine layer, a mass of cool, moist air from the ocean, that advances inland, compromising visibility along the coast and in adjacent inland valleys.
It is important for residents to stay informed about local weather conditions and to heed any advisories or warnings issued by authorities. Awareness of these advisories not only enhances individual safety but underscores the collective responsibility to navigate safely in potentially dangerous conditions.
FAQ
What is a Dense Fog Advisory?
A Dense Fog Advisory is issued when widespread fog reduces visibility to one-quarter mile or less, creating hazardous driving conditions.
How can I stay safe during a Dense Fog Advisory?
If you must travel during the advisory period, slow down, use your headlights, and maintain a safe following distance.
When are Dense Fog Advisories most common in San Diego?
Dense fog is most common during the winter months in San Diego, particularly from November through February.
What causes dense fog in San Diego?
Dense fog in San Diego is often caused by a marine layer—a mass of cool, moist air from the ocean—that moves inland, leading to foggy conditions along the coast and in inland valleys.
Key Features
| Feature | Details |
|---|---|
| Advisory Type | Dense Fog Advisory |
| Effective Period | Until 9:00 AM PST January 22, 2026 |
| Impacted Areas | San Diego County Coastal Areas and Inland Valleys |
| Visibility | One-quarter mile or less |
| Safety Recommendations | Slow down, use headlights, increase following distance |
| Weather Forecast | Mostly cloudy with a slight chance of showers; high temperatures in the mid-60s°F |
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Author: STAFF HERE SAN DIEGO WRITER
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