San Jose started today under clear skies and comfortable morning air, but the real story arrives this afternoon. Inland temperatures are set to surge into the mid-90s, with the South Bay aiming for a high near 94°F and some valley pockets running even hotter. Overnight is not offering much of a cooldown either, with lows only dropping into the mid-60s.
Heat Advisory, Fire Warnings and Coastal Threats
The National Weather Service has issued a Heat Advisory for much of the interior Bay Area starting at noon today, with some inland areas remaining under the advisory into Friday. Heat-sensitive people are at higher risk for heat-related illness during peak afternoon hours. At the same time, a Red Flag Warning covered the interior North Bay and East Bay mountains overnight until this morning, with offshore winds expected to gust 30 to 40 mph and ridgetops possibly seeing gusts over 60 mph.
Along the coast, high astronomical tides combined with a long-period southerly swell are raising the chances of minor coastal flooding around high tide tonight. South- and southwest-facing beaches are also looking at dangerous sneaker waves and strong rip currents. For official hazard details and specific watch and warning times, check the latest from the National Weather Service.
Afternoon Heat and Commute Headaches
With skies staying sunny, the hottest stretch for San Jose will land in the mid-to-late afternoon, roughly between 2 and 4 PM, when hourly forecasts have the city in the low-to-mid 90s. Winds will run lighter on the valley floor but turn breezier over the ridges, and relative humidity in some interior spots could sink into the teens. That combination makes outdoor work and exercise tough, and nudges fire danger higher.
If you have errands, outdoor jobs or workouts lined up, try to move the heavy lifting to early morning or later in the evening and bring plenty of water along for the ride.
Where To Cool Off
For residents without air conditioning, the County of Santa Clara maintains a hot-weather resource page listing cooling centers, and many city libraries and community centers are stepping in as air-conditioned respite spots during this heat event. Be sure to confirm local hours before you head out. The County of Santa Clara offers safety tips and a locator for cooling locations.
Never leave children or pets in parked vehicles for any amount of time, and call 911 right away if you see someone showing signs of heat stroke or heat exhaustion.
Before you venture out, check updated forecasts and local fire-agency alerts, since conditions can shift quickly as offshore winds ease and the marine influence comes and goes. Stay hydrated, avoid heavy exertion during the midday hours on Thursday and Friday, and be especially cautious if you live or work in the interior hills.
