Outdoor conditions in

Portola Valley

California
Air qualityAir quality is moderate at the official reporting area.Air near ground level
Now
  1. 82°Sunny0% rain29% humidityGusts 8 mph
  2. 85°Sunny0% rain28% humidityGusts 8 mph
  3. 86°Sunny0% rain26% humidityGusts 9 mph
  4. 86°Sunny0% rain24% humidityGusts 9 mph
  5. 86°Sunny0% rain24% humidityGusts 8 mph
  6. 83°Clear0% rain28% humidityGusts 5 mph
  7. 77°Clear0% rain32% humidityGusts 5 mph
  8. 71°Clear0% rain35% humidityGusts 6 mph
  9. 69°Clear0% rain37% humidityGusts 3 mph
  10. 68°Clear0% rain36% humidityGusts 3 mph
  11. 67°Clear0% rain36% humidityGusts 3 mph
  12. 66°Clear0% rain35% humidityGusts 2 mph
  13. 65°Clear0% rain37% humidityGusts 1 mph
  14. 63°Clear0% rain38% humidityGusts 1 mph
  15. 63°Clear0% rain38% humidityGusts 2 mph
  16. 62°Clear0% rain39% humidityGusts 2 mph
  17. 61°Clear0% rain40% humidityGusts 5 mph
  18. 61°Sunny0% rain40% humidityGusts 5 mph
  19. 60°Sunny0% rain43% humidityGusts 6 mph
  20. 61°Sunny0% rain44% humidityGusts 7 mph
  21. 66°Sunny0% rain44% humidityGusts 7 mph
  22. 73°Sunny0% rain38% humidityGusts 7 mph
  23. 79°Sunny0% rain32% humidityGusts 7 mph
  24. 84°Sunny0% rain27% humidityGusts 6 mph
Extra care for

A little farther out

The next five days

Today

Today looks fairly quiet.

Rain
0%
Humidity
24–40%
Wind
9 mph
Fri

Friday looks fairly quiet.

Rain
0%
Humidity
22–44%
Wind
7 mph
Sat

Saturday looks fairly quiet.

Rain
0%
Humidity
26–50%
Wind
9 mph
Sun

Sunday looks fairly quiet.

Rain
0%
Humidity
51–86%
Wind
17 mph
Mon

Monday looks breezy.

Rain
25%
Humidity
68–98%
Wind
29 mph
  1. 86° / 67°Today looks fairly quiet.0% rain · Humidity 24–40% · Wind 9 mph
  2. 93° / 60°Friday looks fairly quiet.0% rain · Humidity 22–44% · Wind 7 mph
  3. 92° / 63°Saturday looks fairly quiet.0% rain · Humidity 26–50% · Wind 9 mph
  4. 76° / 53°Sunday looks fairly quiet.0% rain · Humidity 51–86% · Wind 17 mph
  5. 63° / 48°Monday looks breezy.25% rain · Humidity 68–98% · Wind 29 mph

Environmental watch

Air quality + smoke

Air quality

Redwood City area · Updated Thu 12:25 PM
57ModerateUS AQI

Moderate now, easing to Good through Today.

57 is in the Moderate range (51–100). Most people can be active outside; if you’re unusually sensitive to fine particles, consider a shorter or easier outing.

Sky check

No plume detected overhead

Satellite view · Updated Thu 11:45 AM

Air near ground57 · Moderate US AQI

Rain, in motion · Past four hours

Portola Valley radar

Ready when you areSee what is moving toward Portola Valley.

Watch the last four hours of rain, then search any nearby trail, lake, or address.

View the official forecast ↗

Outdoor fire check

Thinking about a backyard fire?

Use extra caution.

There is no lower-concern three-hour stretch in the next 12 hours.

Next 12 hoursChoose a time to see what is driving the concern.
Selected timeNowUse caution

Humidity is 29%.

Humidity
29%
Wind
2 mph
Gusts
8 mph

Check local rules. Weather is only part of the decision. Check city, county, and land-manager fire restrictions before lighting any outdoor fire.

Nearby regional view

Explore San Jose

About 23 miles away, the San Jose hub looks more deeply at San Jose, CA. It reflects that wider area rather than Portola Valley’s exact conditions.

About these readingsSources and local limits

Weather

Forecasts, alerts, and radar come from NOAA and the National Weather Service.

Air quality

This reading describes Redwood City area, about 8 miles away. Conditions can differ at this exact spot.

Smoke

Satellite imagery shows smoke overhead. It cannot tell us how much smoke has reached breathing level.

This page represents Portola Valley, CA, so conditions can vary from street to street. Environmental data: AirNow · participating air agencies · preliminary real-time US AQI · NOAA Hazard Mapping System · satellite-observed smoke.