Today | Weather | Sunday, July 19, 2026

Weather in Simi Valley, California

10:30 PM
Now
Night
72° F
Feels Like 70°
Precipitation 0 %
Wind 5 mph
Humidity 67 %
Today
Cloudy Night
Day 90°
Night 63°
Precipitation 0 %
Wind 5 mph

Simi Valley Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (July 19, 2025)
Cloudy Night

Day

81°

Night

61°

Wind

7 mph

Precipitation

1 %

Air Quality in Simi Valley

NOW
36 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 4.09 µg/m³
PM10 13.12 µg/m³
O3 0.039 ppm
NO2 0.3 ppb
SO2 0.3 ppb
CO 0.07 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)
PM2.54.09 µg/m³
PM1013.12 µg/m³
O376.58 µg/m³
NO20.64 µg/m³
SO20.91 µg/m³
CO85.61 µg/m³
NH30 µg/m³
NO0 µg/m³