Today's a hard pass for any serious outdoor grind, unless your idea of fun is heatstroke bingo.
Why today isn't the day
- There's a full-blown Heat Advisory baking San Jose and the wider Santa Clara Valley until Thursday night, with temps hitting the mid-90s to near 105°F (35-40°C). Overdoing it outside is a fast track to feeling awful.
- Pollen levels are sitting at a moderate buzz, so expect some sneezes and sniffles to go along with that sweat, especially if you're prone to seasonal allergies.
- While the air quality is technically "Good" with an AQI of 25, the heat and moderate pollen are a one-two punch that makes breathing heavy during exertion less than ideal.
Current Conditions & Hazards
It's clear out there right now, which means absolutely no shade from that scorching sun. While our trusty local San Jose Fire Department quickly squashed a vegetation fire near the Highway 280/87 interchange yesterday, don't mistake the lack of smoke for a green light. The real danger today isn't smoke, it's the mercury climbing high enough to fry an egg on the pavement.
Extreme Heat Advisory in Effect!
Seriously, folks. The National Weather Service has slapped a Heat Advisory on us until Thursday evening. Temperatures are projected to soar into the mid-90s and even touch 105°F in some areas. Even mild overnight temperatures won't give you much relief. This isn't just "uncomfortable hot"; this is "your body can't regulate its temperature" hot. Hydration is critical. Get medical help if you experience symptoms of heat exhaustion or stroke.
Trail Talk
If you absolutely insist on getting your miles in, be aware of a few things. The Bay Trail near East Caribbean Drive has some temporary lane closures and detours today (7 AM to 5 PM) due to soil delivery for a restoration project. Flaggers will be out there, so pay attention. Also, don't even think about hitting Anderson Lake County Park for any serious trail runs; most of it remains closed until 2032 for the dam seismic retrofit, so your route will be seriously curtailed. Intermittent closures also affect sections of the Mallard Slough Trail and eastern Alviso Slough Trail because of ongoing hauling and construction.
Pollen Breakdown
| Pollen Type | Level |
|---|---|
| Overall | Moderate |
Pro-Tips from a Fellow Sufferer
If you must run, go before the sun really gets going (we're talking pre-7 AM) or wait until well after sunset. Stick to shaded routes if you can find them. Forget the long sleeves – embrace the tank top. Carry way more water than you think you need, and don't skip the electrolytes. Your sweat rate is probably through the roof today. Listen to your body; if you're dizzy, nauseous, or just feel like garbage, cut it short. Nobody needs a hero collapsing on the Los Gatos Creek Trail.
Data grounded with National Weather Service, AccuWeather, and Santa Clara Valley Water District from October 14, 2026.