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Today | Weather | Tuesday, January 13, 2026
Active Weather Warnings

Weather in Simi Valley, California

12:26 PM
Now
Sunny Weather
73° F
Feels Like 72°
Precipitation 0 %
Wind 15 mph
UV Index (0 - 11+) 3
Humidity 22 %
Today
Sunny Weather
Day 75°
Night 55°
Precipitation 0 %
Wind 13 mph
UV Index (0 - 11+) 3

Simi Valley Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (January 13, 2025)
Windy Weather

Day

63°

Night

45°

Wind

19 mph

UV Index

3

Precipitation

0 %

Air Quality in Simi Valley

NOW
80 AQI
Moderate air quality Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 26.13 µg/m³
PM10 40.67 µg/m³
O3 0.040 ppm
NO2 14.2 ppb
SO2 0.6 ppb
CO 0.38 ppm
NH3 0.33 µg/m³
NO 6.72 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 acceptable; however, for some pollutants, there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.

Show raw pollutant concentrations (µg/m³)
PM2.5 – 26.13 µg/m³
PM10 – 40.67 µg/m³
O3 – 78.52 µg/m³
NO2 – 26.74 µg/m³
SO2 – 1.64 µg/m³
CO – 433.86 µg/m³
NH3 – 0.33 µg/m³
NO – 6.72 µg/m³
View Hourly Air Quality Forecast

Weather Alerts and Warnings for Simi Valley

Moderate Expected Likely

Wind Advisory

Wind Advisory issued January 12 at 1:39PM PST until January 14 at 2:00PM PST by NWS Los Angeles/Oxnard CA
Jan 12, 1:39 PM → Jan 14, 2:00 PM
WHAT: Northeast winds 15 to 25 mph with gusts up to 40 mph.

WHERE: Most valleys of Ventura and western Los Angeles Counties.


WHEN: Until 2 PM PST Wednesday.

IMPACTS: Gusty winds will blow around unsecured objects. Tree
limbs could be blown down and a few power outages may result.

ADDITIONAL DETAILS: Additional Wind Advisories are likely for
later in the week.
+ Read More
Winds this strong can make driving difficult, especially for high profile vehicles. Use extra caution.
Updated: Jan 13, 9:46 AM Source: NWS Alert