Today | Weather | Monday, September 1, 2025
Heat Advisory (Issued when high temperatures and humidity create conditions that may be hazardous during outdoor activity or prolonged exposure.)

Weather in Pasadena, California

08:04 AM
Now
Sunny WeatherSunny weather, clear skies and sunny weather.
68° F
Feels Like 70°
Precipitation 0 %
Wind 2 mph
UV Index (0 - 11+) 11
Humidity 74 %
Today
Sunny WeatherSunny weather, clear skies and sunny weather.
Day 97°
Night 73°
Precipitation 0 %
Wind 6 mph
UV Index (0 - 11+) 11

Warning: Extreme UV Index Today: 11+

Overexposure to the sun's harmful UV rays can cause sunburn and increase the risk of developing skin cancer, including melanoma. Protect yourself by wearing clothing that covers your skin, sunglasses, and a hat. Apply a broad-spectrum sunscreen with an SPF of 30 or higher every two hours, even on cloudy days. Minimize direct sun exposure during peak hours (10 AM to 4 PM) to reduce the risk.

Other:

Warm with plenty of bright sunlight.

Pasadena Weather Forecast Updated

57 minutes ago
Last updated on

Weather Forecast History

Last Year's Weather on This Day (September 1, 2024)

Sunny WeatherSunny weather, clear skies and sunny weather.

Day

90°

Night

64°

Wind

6 mph

UV Index

8

Precipitation

0

Air quality in Pasadena

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

Pollutant Concentrations:

PM2.5 26.53 µg/m³
PM10 27.09 µg/m³
O₃ 9.15 ppb
NO₂ 23.56 ppb
SO₂ 3.95 ppb
CO 354.49 ppb
PM2.5 – Fine particles <2.5μm
PM10 – Inhalable particles <10μm
O3 – Ozone
NO2 – Nitrogen dioxide
SO2 – Sulfur dioxide
CO – Carbon monoxide

Health Recommendations:

Air quality is currently in the acceptable range. However, sensitive individuals should be aware of potential risks from certain pollutants.