San Diego residents might want to hold off packing away their light jackets, as a slight uptick in temperatures for Wednesday and Thursday will be succeeded by a cooler weekend. According to a report by the NWS San Diego, although high temperatures will "warm slightly" in the coming days, they will remain below the seasonal average.
🌡️High temperatures will warm slightly for Wednesday and Thursday before ❄️cooling into the weekend. Despite the short warming trend, temperatures remain below 🍂seasonal average. pic.twitter.com/iXav6MRqlv
— NWS San Diego (@NWSSanDiego) September 30, 2025
Thursday's forecast, gleaned from an early morning update by NWS San Diego, indicates highs ranging "from around 70 near the coast to the lower to mid 80s for the Inland Empire with the mid 90s for the lower deserts." However, the onset of a low-pressure system is set to bring a more pronounced cooling effect. Residents should prepare to swiftly witness the mercury drop, as this system is expected to bring temperatures to around 5 degrees below average across the region.
The inbound low-pressure system won't just usher in a wave of cooler air; it's also predicted to stir up the winds. The NWS San Diego report foresees "southwest to west winds for the mountains and deserts gusting to 30 to 40 mph with isolated gusts to around 50 mph on the east slopes of the mountains." Therefore, outdoor enthusiasts and drivers in high-profile vehicles should be on alert for potentially hazardous conditions.
By the weekend, a "low-pressure system from the north" will further spread the cooling trend inland. This means that, come Sunday and Monday, "high temperatures as much as 8 to 12 degrees below average for the mountains, valleys, and inland Orange County" are anticipated, as per NWS San Diego. There is at least one silver lining for water-bound folks: the Marine forecast is clear, indicating "no hazardous marine conditions are expected through Sunday."
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