Today | Weather | Tuesday, August 25, 2026
Active Weather Warnings

Weather in Norwalk, California

02:12 AM
Now
Night
72° F
Feels Like 73°
Precipitation 0 %
Wind 4 mph
Humidity 81 %
Today
Sunny Weather
Day 99°
Night 72°
Precipitation 0 %
Wind 7 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.

Norwalk Weather Forecast Updated

35 seconds ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (August 25, 2025)
Cloudy Night

Day

88°

Night

66°

Wind

5 mph

Precipitation

1 %

Air Quality in Norwalk

NOW
34 AQI
Good air quality Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 8.13 µg/m³
PM10 22.15 µg/m³
O3 0.036 ppm
NO2 0.3 ppb
SO2 0.2 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)
PM2.58.13 µg/m³
PM1022.15 µg/m³
O370.79 µg/m³
NO20.57 µg/m³
SO20.54 µg/m³
CO75.39 µg/m³
NH30 µg/m³
NO0 µg/m³

Weather Alerts and Warnings for Norwalk

Severe Future Likely

Extreme Heat Watch

Extreme Heat Watch issued August 23 at 12:06AM PDT until August 28 at 8:00PM PDT by NWS Los Angeles/Oxnard CA
Aug 25, 10:00 AM Aug 28, 8:00 PM
WHAT: For the Heat Advisory, temperatures up to 94 expected. For
the Extreme Heat Watch, dangerously hot conditions with
temperatures up to 100 possible.

WHERE: Catalina and Santa Barbara Islands, Los Angeles County
Beaches, Los Angeles County Inland Coast including Downtown Los
Angeles, Malibu Coast, Palos Verdes Hills, Santa Barbara County
Southeastern Coast, Santa Barbara County Southwestern Coast,
Ventura County Beaches, and Ventura County Inland Coast.

WHEN: For the Heat Advisory, from 10 AM this morning to 10 AM PDT
Tuesday. For the Extreme Heat Watch, from Tuesday morning through
Friday evening.

IMPACTS: Heat related illnesses increase significantly during
extreme heat events. Hot temperatures may cause heat illnesses.
+ Read More
Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.
Updated: Aug 24, 12:37 PM Source: NWS Alert
Severe Expected Likely

Extreme Heat Warning

Extreme Heat Warning issued August 25 at 12:02AM PDT until August 28 at 8:00PM PDT by NWS Los Angeles/Oxnard CA
Aug 25, 10:00 AM Aug 28, 8:00 PM
WHAT: For the Heat Advisory, temperatures up to 95. For the
Extreme Heat Warning, dangerously hot conditions with temperatures
up to 102 expected.

WHERE: Catalina and Santa Barbara Islands, Los Angeles County
Beaches, Los Angeles County Inland Coast including Downtown Los
Angeles, Malibu Coast, Palos Verdes Hills, Santa Barbara County
Southeastern Coast, Santa Barbara County Southwestern Coast,
Ventura County Beaches, and Ventura County Inland Coast.

WHEN: For the Heat Advisory, until 10 AM PDT this morning. For the
Extreme Heat Warning, from 10 AM this morning to 8 PM PDT Friday.

IMPACTS: Heat related illnesses increase significantly during
extreme heat events. Hot temperatures may cause heat illnesses.
+ Read More
Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.
Updated: Aug 25, 2:11 AM Source: NWS Alert
Moderate Expected Likely

Heat Advisory

Heat Advisory issued August 25 at 12:02AM PDT until August 25 at 10:00AM PDT by NWS Los Angeles/Oxnard CA
Aug 25, 12:02 AM Aug 25, 10:00 AM
WHAT: For the Heat Advisory, temperatures up to 95. For the
Extreme Heat Warning, dangerously hot conditions with temperatures
up to 102 expected.

WHERE: Catalina and Santa Barbara Islands, Los Angeles County
Beaches, Los Angeles County Inland Coast including Downtown Los
Angeles, Malibu Coast, Palos Verdes Hills, Santa Barbara County
Southeastern Coast, Santa Barbara County Southwestern Coast,
Ventura County Beaches, and Ventura County Inland Coast.

WHEN: For the Heat Advisory, until 10 AM PDT this morning. For the
Extreme Heat Warning, from 10 AM this morning to 8 PM PDT Friday.

IMPACTS: Heat related illnesses increase significantly during
extreme heat events. Hot temperatures may cause heat illnesses.
+ Read More
Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.
Updated: Aug 25, 2:11 AM Source: NWS Alert