Today | Weather | Monday, September 8, 2025

Weather in Fullerton, California

11:30 AM
Now
Sunny Weather
81° F
Feels Like 88°
Precipitation 0 %
Wind 6 mph
UV Index (0 - 11+) 11
Humidity 55 %
Today
Sunny Weather
Day 90°
Night 64°
Precipitation 0 %
Wind 11
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:

Sunny with a twist.

Fullerton Weather Forecast Updated

53 minutes ago
Last updated on

Weather Forecast History

Last Year's Weather on This Day (September 8, 2024)

Hot Day

Day

108°

Night

77°

Wind

4 mph

UV Index

8

Precipitation

6

Air quality in Fullerton

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

Pollutant Concentrations:

PM2.5 17.41 µg/m³
PM10 21.69 µg/m³
O₃ 37.50 ppb
NO₂ 14.86 ppb
SO₂ 4.97 ppb
CO 208.30 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.