Alright, San Jose, let's talk about getting outside today.
Today's a solid day for a run, even if it's not absolutely perfect.
- The air quality is pretty darn good, so breathe deep, Buttercup.
- Temps are in that sweet spot, so your joints should be happy, no extreme heat or chill to complain about.
- Still dealing with some moderate pollen, so if you're one of those people, take your meds.
The Rundown: What to Watch For
The weather report for today, August 30, 2026, is looking mostly clear with temperatures ranging from the mid-50s to upper 70s Fahrenheit (12.5°C to 25°C) across the valley. Winds will be breezy, generally southwest at 10-15 mph, with gusts potentially hitting 20-24 mph near gaps and passes. That's enough to feel it, especially on exposed sections of trails like along the Guadalupe River Trail.
Air Quality Index (AQI) sits at a pleasant 41, which is firmly in the "Good" category. The dominant pollutant is ozone, but at this level, it's not going to be an issue for your average runner. We've got a little haze from fires to the south, but nothing that warrants an alert here. So, no need to dig out the N95s for smoke today, thankfully.
Pollen Report
| Pollen Type | Level (Ambee Data) |
|---|---|
| Overall | Moderate |
Moderate pollen means some of you might be sniffling more than usual. Don't be a hero; pre-dose with your antihistamines if you know you're sensitive. Nothing ruins a tempo run faster than feeling like you're trying to breathe through a wet blanket.
Local Trail Chatter
Alum Rock Park Trail Closures
Heads up if you're planning on hitting Alum Rock Park. The Penitencia Creek Trail is still closed at the Trestle Bridge portion; you'll need to use the park road as a detour. Also, the Mineral Springs Trail is shut down due to erosion. These aren't new closures, but people forget, then end up backtracking. Don't be that person.
There were some older reports of flooding earlier this year, and even last year's rains caused issues on some of our local waterways, but there are no current flood advisories for San Jose, CA, today. Similarly, while we saw some heat advisories earlier in August, today's temperatures are perfectly mild.
No major events are explicitly blocking our usual running haunts like Stevens Creek Trail or the San Tomas Aquino Creek Trail today, which is a rare treat on a weekend.
Gear Up for the Breeze
With those moderate winds, consider a light windbreaker, especially if you're hitting trails higher up or more exposed areas like the Baylands. It's a nice cool down, but it can make you chilly if you stop for too long after a sweaty effort.
Overall, today's a decent day to get your miles in. Just watch for those specific Alum Rock closures and don't forget your allergy meds if the moderate pollen usually gets to you. Keep an eye on your footing, especially around Alum Rock, where "erosion" usually means "ankle-twisting opportunity."
Data grounded with KTVU FOX 2 from August 30, 2026.