Today | Weather | Sunday, January 4, 2026

Weather in Pasadena, California

05:20 PM
Now
Rainy Weather
55° F
Feels Like 54°
Precipitation 48 %
Wind 7 mph
Humidity 90 %
Today
Rainy Weather
Day 57°
Night 48°
Precipitation 93 %
Wind 6 mph
UV Index (0 - 11+) 1

Pasadena Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (January 4, 2025)
Cloudy Weather

Day

63°

Night

50°

Wind

4 mph

UV Index

3

Precipitation

1 %

Air Quality in Pasadena

NOW
42 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 2.22 µg/m³
PM10 3.43 µg/m³
O3 0.046 ppm
NO2 0.1 ppb
SO2 0 ppb
CO 0.10 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)
PM2.52.22 µg/m³
PM103.43 µg/m³
O390.05 µg/m³
NO20.28 µg/m³
SO20.09 µg/m³
CO117.74 µg/m³
NH30 µg/m³
NO0 µg/m³