Today | Weather | Friday, November 13, 2026
Active Weather Warnings

Weather in Sunnyvale, California

03:46 PM
Now
Rainy Weather
59° F
Feels Like 52°
Precipitation 62 %
Wind 16 mph
UV Index (0 - 11+) 0
Humidity 74 %
Today
Rainy Weather
Day 64°
Night 48°
Precipitation 100 %
Wind 13 mph
UV Index (0 - 11+) 1

Sunnyvale Weather Forecast Updated

18 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (November 13, 2025)
Rainy Weather

Day

64°

Night

54°

Wind

5 mph

Precipitation

66 %

Air Quality in Sunnyvale

NOW
46 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 2.59 µg/m³
PM10 6.33 µg/m³
O3 0.049 ppm
NO2 0.2 ppb
SO2 0.1 ppb
CO 0.11 ppm
NH3 0 µg/m³
NO 0.02 µg/m³
PM2.5 – Fine particles <2.5μm
PM10 – Inhalable particles <10μm
O3 – Ozone
NO2 – Nitrogen dioxide
SO2 – Sulfur dioxide
CO – Carbon monoxide
NH3 – Ammonia
NO – Nitric oxide

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

Show raw pollutant concentrations (µg/m³)
PM2.5 – 2.59 µg/m³
PM10 – 6.33 µg/m³
O3 – 97.15 µg/m³
NO2 – 0.37 µg/m³
SO2 – 0.28 µg/m³
CO – 121.09 µg/m³
NH3 – 0 µg/m³
NO – 0.02 µg/m³

Weather Alerts and Warnings for Sunnyvale

Minor Expected Likely

Flood Advisory

Flood Advisory issued November 13 at 2:42PM PST until November 13 at 5:00PM PST by NWS San Francisco CA
Nov 13, 2:42 PM → Nov 13, 5:00 PM
WHAT: Flooding caused by excessive rainfall continues.

WHERE: Alameda County in northern California...
Central Contra Costa County in northern California...
Eastern San Francisco County in northern California...
Northern San Mateo County in northern California...
Northwestern Santa Clara County in northern California...

WHEN: Until 500 PM PST.

IMPACTS: Minor flooding in low-lying and poor drainage areas.
Water over roadways. Overflowing poor drainage areas. Ponding of
water in urban or other areas is occurring or is imminent.

ADDITIONAL DETAILS:
- At 240 PM PST, the public reported heavy rain in the advisory
area. Overflowing poor drainage areas have already caused minor
flooding in the advisory area.
- The main rain band has moved out of the East Bay but nuisance
flooding lingers across urban areas. Expect nuisance flooding to
trend downwards over the next two hours.
- Some locations that will experience flooding include...
San Jose, Oakland, Fremont, Hayward, Sunnyvale, Santa Clara,
Berkeley, Richmond, Daly City, San Mateo, San Leandro, Redwood
City, Mountain View, Alameda and Union City.
- http://www.weather.gov/safety/flood
+ Read More
Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles.
Updated: Nov 13, 3:27 PM Source: NWS Alert