The National Weather Service San Diego has indicated a minor warming trend today, even as temperatures remain below what's typically expected this time of year. Meteorologists note "minor warming today though highs will still be several degrees below normal." Residents can expect the mercury to rise slightly as the week progresses, foreshadowing hotter days ahead, per the National Weather Service.
The same forecast mentions that low pressure along the West Coast is the cause of the current less-than-scorching conditions. But don't get too comfortable in your sweaters just yet; high pressure is set to bulldoze its way in, bringing with it a welcome—or unwelcome, depending on one's aversion to heat, warming trend. By Monday, San Diegans will start to feel temperatures edge closer to their typical values.
As Thursday and Friday inch closer, the weather is projected to reach its peak heat for the week. However, "with any gulf surges this may not necessarily be true for the low deserts," according to the more detailed Area Forecast Discussion. High pressure stubbornly sticking around the Desert Southwest will contribute to this upsurge in degrees, prompting the National Weather Service to flag a moderate to high HeatRisk in various inland and mountainous regions.
Not to be outdone by the heat, monsoon moisture is expected to sneak into the region. Chances of showers and thunderstorms over the mountains and deserts range from 15-40 percent between Thursday and Saturday, with the highest probability occurring Friday and Saturday. It's a weather roller coaster, with moisture and instability crucial in determining if and when the area could experience a full-on monsoon episode. While the marine layer promises some cooler relief near the coast, the inland valleys and mountains should brace for potential swelters and storms.
