Today | Weather | Friday, October 9, 2026

Weather in Pasadena, California

04:39 AM
Now
Cloudy Night
70° F
Feels Like 66°
Precipitation 0 %
Wind 4 mph
Humidity 71 %
Today
Cloudy Weather
Day 90°
Night 64°
Precipitation 0 %
Wind 6 mph
UV Index (0 - 11+) 5

Pasadena Weather Forecast Updated

38 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (October 9, 2025)
Cloudy Night

Day

79°

Night

63°

Wind

4 mph

Precipitation

25 %

Air Quality in Pasadena

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

Pollutant Concentrations:

PM2.5 14.96 µg/m³
PM10 35.7 µg/m³
O3 0.046 ppm
NO2 0.2 ppb
SO2 0.3 ppb
CO 0.11 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 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 – 14.96 µg/m³
PM10 – 35.7 µg/m³
O3 – 89.81 µg/m³
NO2 – 0.38 µg/m³
SO2 – 0.67 µg/m³
CO – 123.05 µg/m³
NH3 – 0 µg/m³
NO – 0 µg/m³