Residents in Southern California are bracing for continued above-average temperatures this week, with forecasters from the National Weather Service in San Diego projecting that today may likely be the hottest day in the region. According to the NWS update, "Hot conditions for inland areas will continue through much of this week," with inland temperatures 10-20 degrees above seasonal averages. Highs in some inland valleys are expected to reach the mid-90s to about 103 degrees.
The NWS has issued an Excessive Heat Warning until 8 PM Monday for several regions, including the Coachella Valley, San Diego Deserts, and San Bernardino and Riverside County Valleys. Coastal areas, under the influence of a shallower marine layer, may experience slightly cooler temperatures. Tuesday is anticipated to bring some reprieve, with NWS stating, "Tuesday will be noticeably cooler for much of the region as the upper trough moves overhead."
Amid scorching temperatures, the marine layer has kept coastal regions from reaching the same extremes. "Stratus with bases 400-800 ft MSL and tops to 1100 MSL continuing along the coast," the NWS reports, pointing to a pattern that should bring cooling to the affected areas beginning Tuesday as the marine layer deepens significantly. These cooler air masses are expected to spread farther inland, kickstarting a gradual temperature decline for all affected areas.
While a cooling trend is on the horizon, inland temperatures will still be up to 6 degrees above seasonal averages into the weekend. "Saturday will likely be the coolest day overall. However, inland temperatures will still be as much as 6 degrees above average," the NWS San Diego's Area Forecast Discussion clarifies. Despite an anticipated cooldown, a temperature rise is again possible next Sunday as high pressure reclaims its presence, though forecasters note that the outlook remains uncertain.
Marine conditions are expected to remain non-threatening despite the prevalence of fog reducing visibility to 1-3 nautical miles in the nearshore waters. The NWS advises that this pattern is set to persist through late Monday morning. On the environmental response front, Skywarn activation has not been requested. Still, spotters are encouraged to report significant weather conditions, illustrating a proactive approach to community-based weather awareness during this period of extreme heat.
