Today | Weather | Monday, September 22, 2025

Weather in Pasadena, California

02:45 AM

Now

66° F

Feels Like 64°

Precipitation 7 %

Wind 4 mph

Humidity 71 %

Today

Day 86°

Night 70°

Precipitation 0 %

Wind 10

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.

Pasadena Weather Forecast Updated

41 minutes ago

Last updated on September 22, 2025 2:03 AM

Weather Forecast History

Last Year's Weather on This Day (September 22, 2024)

Day

84°

Night

63°

Wind

4 mph

UV Index

Precipitation

Air quality in Pasadena

NOW

64 AQI

Moderate air quality Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 27.13 µg/m³

PM10 36.54 µg/m³

O₃ 7.68 ppb

NO₂ 29.11 ppb

SO₂ 3.09 ppb

CO 347.92 ppb

PM_2.5 – 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.

View Hourly Air Quality Forecast