Today | Weather | Sunday, May 17, 2026
Active Weather Warnings

Weather in San Francisco, California

12:43 AM
Now
Cloudy Night
54° F
Feels Like 46°
Precipitation 0 %
Wind 12 mph
Humidity 76 %
Today
Sunny Weather
Day 72°
Night 64°
Precipitation 0 %
Wind 14 mph
UV Index (0 - 11+) 10

Warning: High UV Index Today: 10

High risk of harm from unprotected sun exposure. Take precautions: wear a hat, sunglasses, and apply sunscreen regularly if you’ll be outdoors for extended periods.

San Francisco Weather Forecast Updated

36 seconds ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (May 17, 2025)
Cloudy Weather

Day

64°

Night

50°

Wind

22 mph

UV Index

9

Precipitation

4 %

Air Quality in San Francisco

NOW
46 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 3.94 µg/m³
PM10 20.51 µg/m³
O3 0.049 ppm
NO2 0.2 ppb
SO2 0.2 ppb
CO 0.11 ppm
NH3 0 µg/m³
NO 0 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)
PM2.53.94 µg/m³
PM1020.51 µg/m³
O396.65 µg/m³
NO20.33 µg/m³
SO20.58 µg/m³
CO124.27 µg/m³
NH30 µg/m³
NO0 µg/m³

Weather Alerts and Warnings for San Francisco

Moderate Expected Likely

Wind Advisory

Wind Advisory issued May 16 at 9:36PM PDT until May 17 at 5:00AM PDT by NWS San Francisco CA
May 16, 9:36 PM May 17, 5:00 AM
WHAT: Northwest winds 15 to 30 mph with gusts up to 45 mph, with
local gusts up to 55 mph.

WHERE: Southern Monterey Bay and the Big Sur Coast, San Francisco,
Coastal North Bay Including Point Reyes National Seashore, and San
Francisco Peninsula Coast.

WHEN: Until 5 AM PDT Sunday.

IMPACTS: Gusty winds will blow around unsecured objects. Tree
limbs could be blown down and a few power outages may result.
Blowing and drifting sand.
+ Read More
Winds this strong can make driving difficult, especially for high profile vehicles. Use extra caution. Secure outdoor objects.
Updated: May 17, 12:43 AM Source: NWS Alert
Moderate Expected Likely

Beach Hazards Statement

Beach Hazards Statement issued May 16 at 9:45PM PDT until May 18 at 9:00AM PDT by NWS San Francisco CA
May 16, 9:45 PM May 18, 9:00 AM
WHAT: Strong northerly winds will generate very rough
conditions at area beaches along with strong rip and longshore
currents.

WHERE: Greatest impacts will be along west facing beaches of
the Pacific coastline.

WHEN: Through Monday morning.

IMPACTS: Dangerous wind and wave conditions will impact
beaches and water activities such as swimming, surfing,
boating, and tide pooling. Rough seas can sweep up the beach
and over rocks and jetties, pulling people into a cold
turbulent ocean. Rip currents will be stronger than normal and
long shore currents can move people and items in the water
quickly away from the point of entry. Local beach and cliff
erosion is possible. Water temperatures will also cool rapidly
due to strong upwelling conditions during this time. Large
tidal swings can cutoff access to beach walkers.
+ Read More
Stay off of jetties, piers, rocks, and other waterside infrastructure. Remain out of the water to avoid hazardous surf and NEVER turn your back on the ocean. Monitor local weather, surf and tide forecasts at www.weather.gov/mtr.
Updated: May 17, 12:43 AM Source: NWS Alert