Today | Weather | Monday, July 20, 2026

Weather in Lake Forest, California

02:20 PM
Now
Cloudy Weather
88° F
Feels Like 93°
Precipitation 20 %
Wind 8 mph
UV Index (0 - 11+) 7
Humidity 43 %
Today
Partly Sunny with Showers
Day 91°
Night 66°
Precipitation 90 %
Wind 6 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.

Lake Forest Weather Forecast Updated

3 minutes ago
Last updated on

Air Quality in Lake Forest

NOW
35 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 4.96 µg/m³
PM10 13.76 µg/m³
O3 0.038 ppm
NO2 0.1 ppb
SO2 0.2 ppb
CO 0.07 ppm
NH3 0 µg/m³
NO 0.05 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)
PM2.54.96 µg/m³
PM1013.76 µg/m³
O373.62 µg/m³
NO20.2 µg/m³
SO20.65 µg/m³
CO84.66 µg/m³
NH30 µg/m³
NO0.05 µg/m³