Today | Weather | Saturday, August 29, 2026
Active Weather Warnings

Weather in Simi Valley, California

01:14 AM
Now
Cloudy Night
79° F
Feels Like 75°
Precipitation 0 %
Wind 5 mph
Humidity 49 %
Today
Sunny Weather
Day 97°
Night 64°
Precipitation 1 %
Wind 8 mph
UV Index (0 - 11+) 9

Warning: High UV Index Today: 9

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.

Simi Valley Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (August 29, 2025)
Night

Day

90°

Night

63°

Wind

5 mph

Precipitation

0 %

Air Quality in Simi Valley

NOW
156 AQI
Unhealthy air quality Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 65.97 µg/m³
PM10 83.44 µg/m³
O3 0.043 ppm
NO2 1.1 ppb
SO2 0.3 ppb
CO 0.17 ppm
NH3 0.4 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:

Everyone may begin to experience health effects; members of sensitive groups may experience more serious health effects.

Show raw pollutant concentrations (µg/m³)
PM2.565.97 µg/m³
PM1083.44 µg/m³
O385.17 µg/m³
NO22.07 µg/m³
SO20.69 µg/m³
CO197.12 µg/m³
NH30.4 µg/m³
NO0 µg/m³

Weather Alerts and Warnings for Simi Valley

Moderate Expected Likely

Heat Advisory

Heat Advisory issued August 28 at 11:16AM PDT until August 29 at 8:00PM PDT by NWS Los Angeles/Oxnard CA
Aug 28, 8:00 PM Aug 29, 8:00 PM
WHAT: Hot daytime conditions with high temperatures between 98 and
108 common, hottest Friday. Warm overnight conditions will bring
less relief than usual.

WHERE: Most valleys of Los Angeles and Ventura Counties.

WHEN: For the Extreme Heat Warning, until 8 PM PDT this evening.
For the Heat Advisory, from 8 PM this evening to 8 PM PDT Saturday.

IMPACTS: There is a high risk for dangerous heat illness,
especially for sensitive groups like the very young, the very old,
those without air conditioning, and those active outdoors.
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Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Do not leave young children and pets in unattended vehicles. Limit strenuous activities to early morning or evening hours. Take action when you see symptoms of heat exhaustion.
Updated: Aug 29, 12:08 AM Source: NWS Alert