Alright, San Jose, today's your pretty standard, slightly gray, "get out there and grind" kind of day.
- That marine layer is hanging tough, keeping temps cool and the air blessedly clean. Your lungs are getting a break from the usual Bay Area funk.
- Pollen is moderate, though, so if you're one of those unlucky souls who turns into a snot factory this time of year, consider hitting the treadmill or popping an antihistamine before you head out.
- Still some scattered, long-term construction to be aware of, but nothing catastrophic blocking your main running arteries today.
Air Quality & Allergens
| Pollutant Category | Level | AQI | Dominant Pollutant |
|---|---|---|---|
| Air Quality | Good | 31 | Ozone/Other |
| Tree Pollen | Moderate | N/A | N/A |
That "moderate" pollen forecast isn't a joke if you're prone to seasonal allergies. Expect some sniffles, watery eyes, and maybe that lovely post-run asthma cough if you're not careful. Stick to areas with less foliage or plan your run for later in the day when pollen counts typically drop.
Weather Outlook
We're looking at a mostly overcast morning, with temperatures hovering around a comfortable 13.9°C (57°F). Don't expect blazing sun, but also don't anticipate getting soaked. There's a minimal chance of drizzle along the coast, but inland San Jose should stay dry. Perfect weather for a long run without overheating, honestly. Just keep an eye on those clouds; they tend to burn off later, but sometimes they like to play peek-a-boo all day.
Local Hazards & Annoyances
Good news, folks: no major fire smoke choking our air today, no flash flood warnings, and no extreme heat advisories that would melt your sneakers to the pavement. The wind should be fairly calm, too.
However, if your usual route takes you near the Alviso Slough Trail, remember there are still intermittent closures due to ongoing hauling and construction. Don't be that person who ignores the signs and then complains about getting covered in dust or having to turn back. Check the Santa Clara County Parks website before you head out if that's your jam.
Also, for you early birds hitting the streets: the VTA is doing some overnight road closures on Northbound Capitol Avenue and Capitol Expressway until 5:30 AM, so be aware of potential detours or less-than-ideal running conditions if you're out before dawn in those areas.
Remember that the huge Anderson Dam Seismic Retrofit Project means Anderson Lake County Park is largely closed until roughly 2032. If you were planning a long run around there, you're about six years too early. Find an alternate route, folks. Coyote Creek Trail is still mostly open, for now.
Overall, it's a decent day for a workout outside if you manage your allergies. Get after it, but stay situationally aware.
Data grounded with Google Search from May 25, 2026.