Extreme Heat Warning Arrives Tuesday — Inland Areas Face Days of Dangerous Temperatures
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A Heat Advisory already in effect for inland valleys and mountain areas transitions to the more serious designation of an Extreme Heat Warning beginning at 10 a.m. Tuesday, August 25th, running through 8 p.m. Friday, August 28th. A persistent high-pressure ridge is holding temperatures five to ten degrees above normal countywide.
Specific projections put La Mesa at 92 degrees Monday, climbing to 97 to 99 degrees by Wednesday and Thursday. Coastal San Diego sits near 85 degrees Monday, rising to the upper 80s and low 90s by midweek — warmer than typical but significantly cooler than inland areas, where the marine layer provides little relief. Desert areas face their own Extreme Heat Warning through Friday night, with major-to-extreme heat risk levels flagged by forecasters. Isolated afternoon mountain showers from monsoonal moisture are possible later in the week, but thunderstorm development looks unlikely through the early part of the period.
For the community calendar, the San Diego Ho'olauleʻa Hawaiian Cultural Festival and SAMAFEST, the Philippine Cultural Arts Festival at Balboa Park, both conclude Monday — today is the final opportunity to attend either event. The Pacific Beach Farmers Market runs Tuesday, the Little Italy Mercato and Taste of Encinitas are both Wednesday, and the San Diego Regional EDC holds its Q3 Inclusive Growth Roundtable on Talent on Wednesday, August 26th at 11:30 a.m. The Jackalope Indie Artisan Fair opens at Liberty Station NTC on Saturday, August 29th.