Today | Weather | Saturday, April 4, 2026

Weather in San Diego, California

05:08 AM
Now
Cloudy Night
55° F
Feels Like 55°
Precipitation 0 %
Wind 5 mph
Humidity 81 %
Today
Cloudy Weather
Day 79°
Night 54°
Precipitation 1 %
Wind 7 mph
UV Index (0 - 11+) 8

Warning: High UV Index Today: 8

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 Diego Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (April 4, 2025)
Partly Sunny with Showers

Day

64°

Night

48°

Wind

7 mph

UV Index

8

Precipitation

49 %

Air Quality in San Diego

NOW
50 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 6.98 µg/m³
PM10 15.79 µg/m³
O3 0.054 ppm
NO2 0.3 ppb
SO2 0.2 ppb
CO 0.12 ppm
NH3 0.35 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)
PM2.56.98 µg/m³
PM1015.79 µg/m³
O3106.03 µg/m³
NO20.5 µg/m³
SO20.6 µg/m³
CO136.51 µg/m³
NH30.35 µg/m³
NO0 µg/m³