San Diego

San Diego's NWS Forecasts Rising Temperatures and Possible Rain in Southern California

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Published on September 23, 2025
San Diego's NWS Forecasts Rising Temperatures and Possible Rain in Southern CaliforniaSource: Amantonacci, CC BY-SA 4.0, via Wikimedia Commons

The National Weather Service in San Diego has issued a weather forecast announcing changes in the temperatures and possible rainfall for Southern California. "There will be warming of 5 to locally 10 degrees today with drying of mid and high level moisture for today and Wednesday," according to the NWS San Diego update. Coastal regions can expect highs from the mid-70s to the lower 80s, while the Inland Empire may hit the 90s, and the lower deserts could sizzle with temperatures reaching 102 degrees.

A cooling trend is expected to descend upon the region starting Wednesday, connected with low pressure moving into central and southern California that could provide relief from the preceding heat. Inland areas foresee temperatures on Friday to be "10 to 15 degrees cooler on Friday than for today," as mentioned by NWS San Diego. This contrasts with how things a few degrees above average for lower deserts range from the mid-70s to the lower 80s near the coast, which is expected for today's highs.

Looming over the weekend, chances of precipitation emerge on the horizon. NWS San Diego's forecast suggests a "20 to 30 percent chance of showers for Friday and Saturday along with a slight chance of thunderstorms." The shift in weather brings in cooler air, with Friday's temperatures potentially "5 to 10 degrees below average for the mountains and inland valleys." This should bring temperatures down to the lower 70s near the coast and mid-80s for the Inland Empire.

By the onset of next week, warmth is set to envelop the area once more. "Gradual warming will spread inland for Saturday through Monday, with Monday high temperatures within a few degrees of average," according to NWS San Diego. The beginning of the week might see people near the coast enjoy 70s, while the Inland Empire might experience heat approaching 90 degrees and the lower deserts the mid- to upper 90s, which showcases a return to a semblance of climatic normalcy after the cooldown.