Today | Weather | Sunday, December 14, 2025

Weather in Simi Valley, California

04:56 AM
Now
Cloudy Night
48° F
Feels Like 45°
Precipitation 0 %
Wind 7 mph
Humidity 73 %
Today
Cloudy Weather
Day 77°
Night 54°
Precipitation 0 %
Wind 6 mph
UV Index (0 - 11+) 3

Simi Valley Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (December 14, 2024)
Cloudy Night

Day

61°

Night

41°

Wind

6 mph

Precipitation

0 %

Air Quality in Simi Valley

NOW
35 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 4.76 µg/m³
PM10 11.97 µg/m³
O3 0.038 ppm
NO2 0.4 ppb
SO2 0.2 ppb
CO 0.08 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)
PM2.54.76 µg/m³
PM1011.97 µg/m³
O374.97 µg/m³
NO20.81 µg/m³
SO20.57 µg/m³
CO97.31 µg/m³
NH30 µg/m³
NO0 µg/m³