Today | Weather | Thursday, October 29, 2026

Weather in Simi Valley, California

04:50 PM
Now
Cloudy Weather
70° F
Feels Like 66°
Precipitation 7 %
Wind 8 mph
UV Index (0 - 11+) 1
Humidity 62 %
Today
Cloudy Weather
Day 70°
Night 57°
Precipitation 25 %
Wind 5 mph
UV Index (0 - 11+) 2

Simi Valley Weather Forecast Updated

1 minute ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (October 29, 2025)
Night

Day

91°

Night

57°

Wind

7 mph

Precipitation

0 %

Air Quality in Simi Valley

NOW
49 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 3.27 µg/m³
PM10 9.08 µg/m³
O3 0.053 ppm
NO2 0.2 ppb
SO2 0.2 ppb
CO 0.11 ppm
NH3 0 µg/m³
NO 0.01 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)
PM2.5 – 3.27 µg/m³
PM10 – 9.08 µg/m³
O3 – 104.68 µg/m³
NO2 – 0.34 µg/m³
SO2 – 0.4 µg/m³
CO – 127.65 µg/m³
NH3 – 0 µg/m³
NO – 0.01 µg/m³