Today | Weather | Thursday, May 21, 2026

Weather in Daly City, California

02:07 AM
Now
Cloudy Night
52° F
Feels Like 48°
Precipitation 0 %
Wind 7 mph
Humidity 91 %
Today
Cloudy Weather
Day 63°
Night 52°
Precipitation 1 %
Wind 10 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.

Daly City Weather Forecast Updated

10 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (May 21, 2025)
Sunny Weather

Day

66°

Night

50°

Wind

12 mph

UV Index

11

Precipitation

1 %

Air Quality in Daly City

NOW
43 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 5.47 µg/m³
PM10 18.79 µg/m³
O3 0.046 ppm
NO2 0.5 ppb
SO2 0.4 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)
PM2.55.47 µg/m³
PM1018.79 µg/m³
O390.19 µg/m³
NO20.98 µg/m³
SO20.94 µg/m³
CO123.96 µg/m³
NH30 µg/m³
NO0 µg/m³