Today | Weather | Monday, April 27, 2026

Weather in Pasadena, California

02:37 PM
Now
Cloudy Weather
66° F
Feels Like 72°
Precipitation 0 %
Wind 9 mph
UV Index (0 - 11+) 7
Humidity 42 %
Today
Cloudy Weather
Day 66°
Night 48°
Precipitation 5 %
Wind 7 mph
UV Index (0 - 11+) 10

Warning: High UV Index Today: 10

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.

Pasadena Weather Forecast Updated

24 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (April 27, 2025)
Partly Sunny with Showers

Day

61°

Night

54°

Wind

6 mph

UV Index

4

Precipitation

49 %

Air Quality in Pasadena

NOW
84 AQI
Moderate air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 1.36 µg/m³
PM10 3.07 µg/m³
O3 0.065 ppm
NO2 0.1 ppb
SO2 0.1 ppb
CO 0.11 ppm
NH3 0 µg/m³
NO 0.02 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)
PM2.51.36 µg/m³
PM103.07 µg/m³
O3127.62 µg/m³
NO20.14 µg/m³
SO20.38 µg/m³
CO127.85 µg/m³
NH30 µg/m³
NO0.02 µg/m³