Brace yourselves as the National Weather Service in San Diego signals a persistent Moderate HeatRisk through the weekend for inland valleys and mountains with a Major HeatRisk in the deserts. According to the NWS San Diego forecast, Sunday's high temperatures range widely across the region, sizzling highs of 107 to 112 degrees in the low desert, while coastal areas can expect a milder 72 to 80 degrees.
The heat shows no signs of letting up into early next week, with the inland valleys baking at 89 to 102 degrees Monday and 88 to 99 on Tuesday. The mountains at elevations of 4000 ft and above will simmer at temperatures between 83 to 96 degrees on Monday, according to the same NWS forecast. On top of that, there's a sprinkle of excitement as a "15-20 percent chance of showers and thunderstorms" is expected over portions of San Diego County mountains and adjacent desert slopes, as indicated in a NWS San Diego discussion.
For those pining for a cool-off, slow relief is on the way. The NWS San Diego predicts a "gradual cooling for the remainder of the week." However, if you're sweating out in the low deserts, stay hydrated—current advisories warn of an Extreme Heat Warning in effect here until 8 PM PDT Tuesday.
Marine layer enthusiasts may find solace, though, as areas of low clouds and fog delicately reach into the far western valleys each night and morning through early next week. For those hitting the surf, watch out for "Long period (16-17 second) southwesterly swell" that could churn up the waters with 3 to 6 feet waves, bringing high rip currents along certain beaches. This information comes from the same NWS discussion, so coastal visitors and residents, keep a mindful eye on the tides.
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