San Diego is set to experience dramatic weather swings this week as shifting climate patterns bring soaring temperatures today, followed by a sharp cooldown and potential rain by the weekend. According to the National Weather Service San Diego, a “minor to moderate heat risk” is in effect for valleys and low deserts, with coastal areas reaching the 70s and inland valleys climbing into the low 90s.
A Dense Fog Advisory remained active until 9 AM PST this morning, mainly impacting San Diego County’s coastal zones. The thick fog reduced visibility significantly, complicating early commutes with a misty haze. Meanwhile, “weak Santa Ana winds” are fueling heightened fire weather conditions, with gusts between 25 and 40 mph along coastal slopes—an unusual pairing of heat, dryness, and gusty winds.
Relief is on the horizon as the NWS forecasts a notable cooldown by midweek, accompanied by an increasing chance of widespread rain heading into the weekend. The shift will replace the current dry pattern—marked by low humidity and easterly winds—with cooler, wetter conditions and a lower fire risk.
By Friday, San Diegans can expect highs in the 60s and a “windy and wet pattern,” according to the NWS Area Forecast Discussion. The end of the week could even bring snow to higher elevations, with snow levels forecast to drop to around 6,500 feet Friday night—a stark contrast to today’s inland heat.
The marine forecast adds to the mix of changing conditions. “Patchy fog along coastal waters” has reduced visibility to less than one nautical mile, and stronger winds and rain are expected by late Thursday, with sustained gusts exceeding 20 knots. Residents are advised to stay prepared for rapidly changing conditions as San Diego transitions from heat to chill—proof once again that California’s sunny skies can quickly give way to stormy surprises.
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