San Diego/ Weather & Environment

Marine Layer Mornings, Beach-Day Afternoons: San Diego Set For Mild, Sunny Stretch

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Published on September 15, 2026
Marine Layer Mornings, Beach-Day Afternoons: San Diego Set For Mild, Sunny StretchSource: Alyssa Best / Unsplash

San Diego starts Tuesday under cloudy skies and mild temperatures, but the gray is expected to give way to sunshine by late morning. The city should reach about 76 degrees this afternoon.

Clouds Clear For A Sunny Afternoon

Low coastal clouds may spread inland across parts of the valleys overnight and into Wednesday morning, giving early commuters another marine-layer morning. After that, the forecast turns mostly sunny, with south winds around 5 to 10 mph, according to the National Weather Service.

Cooler Wednesday Before A Slow Warm-Up

Wednesday will be slightly cooler, with a high near 75 and an overnight low around 65 under mostly sunny skies. Temperatures then edge upward Thursday and Friday before topping out near 78 on Saturday.

Mild And Dry Through The Weekend

Sunday and Monday should bring cooler weather, with Monday coastal highs in the lower to mid-70s. Overnight lows will stay in the mid-60s. Moisture will remain limited, and the chance of measurable rainfall in the mountains on Monday is less than 5 percent.