Today | Weather | Friday, September 18, 2026

Weather in Santa Monica, California

07:55 PM
Now
Night
72° F
Feels Like 70°
Precipitation 0 %
Wind 7 mph
Humidity 76 %
Today
Night
Day 72°
Night 66°
Precipitation 0 %
Wind 5 mph

Santa Monica Weather Forecast Updated

19 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (September 18, 2025)
Rainy Night

Day

73°

Night

68°

Wind

5 mph

Precipitation

60 %

Air Quality in Santa Monica

NOW
45 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 7.91 µg/m³
PM10 23.3 µg/m³
O3 0.048 ppm
NO2 0.2 ppb
SO2 0.3 ppb
CO 0.13 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)
PM2.57.91 µg/m³
PM1023.3 µg/m³
O394.57 µg/m³
NO20.41 µg/m³
SO20.73 µg/m³
CO150.98 µg/m³
NH30 µg/m³
NO0 µg/m³