Today | Weather | Friday, December 12, 2025

Weather in Pasadena, California

11:20 AM
Now
Cloudy Weather
70° F
Feels Like 73°
Precipitation 0 %
Wind 4 mph
UV Index (0 - 11+) 3
Humidity 22 %
Today
Sunny Weather
Day 79°
Night 52°
Precipitation 0 %
Wind 4 mph
UV Index (0 - 11+) 3

Pasadena Weather Forecast Updated

4 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (December 12, 2024)
Cloudy Night

Day

59°

Night

45°

Wind

4 mph

Precipitation

1 %

Air Quality in Pasadena

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

Pollutant Concentrations:

PM2.5 29.6 µg/m³
PM10 34.38 µg/m³
O3 0.036 ppm
NO2 0.6 ppb
SO2 0.2 ppb
CO 0.20 ppm
NH3 0.41 µg/m³
NO 0.18 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)
PM2.529.6 µg/m³
PM1034.38 µg/m³
O370.02 µg/m³
NO21.13 µg/m³
SO20.63 µg/m³
CO229.38 µg/m³
NH30.41 µg/m³
NO0.18 µg/m³