Hourly Weather | Today Wednesday, May 20, 2026
Active Weather Warnings
Alhambra, California
4 PM
Sunny Weather
84°
Feels Like 88°
0
Humidity: 19%
UV Index: 5
Wind: 10 mph
5 PM
Cloudy Weather
84°
Feels Like 84°
0
Humidity: 19%
UV Index: 3
Wind: 9 mph
6 PM
Sunny Weather
84°
Feels Like 82°
0
Humidity: 18%
UV Index: 2
Wind: 8 mph
7 PM
Sunny Weather
82°
Feels Like 81°
0
Humidity: 19%
UV Index: 1
Wind: 7 mph
8 PM
Cloudy Night
79°
Feels Like 77°
0
Humidity: 24%
UV Index: 0
Wind: 6 mph
9 PM
Cloudy Night
75°
Feels Like 73°
0
Humidity: 28%
UV Index: 0
Wind: 6 mph
10 PM
Cloudy Night
73°
Feels Like 72°
0
Humidity: 32%
UV Index: 0
Wind: 6 mph
11 PM
Cloudy Night
70°
Feels Like 68°
0
Humidity: 37%
UV Index: 0
Wind: 5 mph

Hourly Air Quality Forecast - AQI (US EPA)

4 PM
47 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 9.95 µg/m³
  • PM10: 23.79 µg/m³
  • O3: 0.051 ppm
  • NO2: 0.2 ppb
  • SO2: 0.3 ppb
  • CO: 0.11 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

5 PM
48 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 10.31 µg/m³
  • PM10: 24.96 µg/m³
  • O3: 0.052 ppm
  • NO2: 0.2 ppb
  • SO2: 0.3 ppb
  • CO: 0.11 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

6 PM
49 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 10.77 µg/m³
  • PM10: 25.72 µg/m³
  • O3: 0.053 ppm
  • NO2: 0.2 ppb
  • SO2: 0.3 ppb
  • CO: 0.11 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

7 PM
49 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 11.19 µg/m³
  • PM10: 26.08 µg/m³
  • O3: 0.053 ppm
  • NO2: 0.3 ppb
  • SO2: 0.3 ppb
  • CO: 0.11 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

8 PM
48 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 11.34 µg/m³
  • PM10: 26.23 µg/m³
  • O3: 0.052 ppm
  • NO2: 0.3 ppb
  • SO2: 0.3 ppb
  • CO: 0.11 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

9 PM
47 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 11.03 µg/m³
  • PM10: 25.68 µg/m³
  • O3: 0.051 ppm
  • NO2: 0.3 ppb
  • SO2: 0.3 ppb
  • CO: 0.11 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

10 PM
45 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 10.21 µg/m³
  • PM10: 24.26 µg/m³
  • O3: 0.048 ppm
  • NO2: 0.3 ppb
  • SO2: 0.3 ppb
  • CO: 0.10 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

11 PM
43 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 9.26 µg/m³
  • PM10: 22.41 µg/m³
  • O3: 0.047 ppm
  • NO2: 0.3 ppb
  • SO2: 0.3 ppb
  • CO: 0.10 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

Weather Alerts and Warnings for Alhambra

Air Quality Alert

Air Quality Alert issued May 19 at 9:43PM PDT by NWS Los Angeles/Oxnard CA
May 19, 9:43 PM May 20, 5:30 PM
WHAT: The South Coast AQMD has issued an air quality alert due to
increased fine particle pollution from wildfire smoke. Visit
https://www.aqmd.gov/alertinfo to check current and forecasted air
quality levels.

WHERE: in portions of Los Angeles County. Levels of particle
pollution can vary by time and location depending on fire activity
and local weather conditions.

WHEN: until Wednesday at 4:30 PM.

IMPACTS: Particles in wildfire smoke can get deep into the lungs
and cause serious health problems such as heart attacks, strokes,
asthma attacks, and difficulty breathing. Everyone can be affected,
but people with lung or heart disease, older adults, people who
are pregnant, children, and those who spend a lot of time outdoors
are at greater risk.
+ Read More
To protect your health, if you smell or see smoke: * Remain indoors with windows and doors closed * Avoid intense outdoor physical activity * Run your air conditioner and/or an air purifier * If you must be outdoors, keep the time brief and wear a well- fitting N-95 mask * Do not use whole house fans or swamp coolers that bring in outside air if you have other methods to stay cool * Avoid other sources of pollution such as fireplaces, candles, incense, grilling, and gasoline-powered lawn and garden equipment
Updated: May 20, 3:10 PM Source: NWS Alert