Today | Weather | Friday, August 22, 2025

Heat Advisory (Issued when high temperatures and humidity create conditions that may be hazardous during outdoor activity or prolonged exposure.)

Weather in El Cajon, California

06:44 PM

Now

86° F

Feels Like 84°

Precipitation 5 %

Wind 6 mph

UV Index (0 - 11+) 5

Humidity 43 %

Today

Day 91°

Night 68°

Precipitation 25 %

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:

Mostly bright and clear and warm.

El Cajon Weather Forecast Updated

Last updated on August 22, 2025 5:02 PM

Weather Forecast History

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

Day

86°

Night

64°

Air quality in El Cajon

NOW

63 AQI

Moderate air quality Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 14.38 µg/m³

PM10 37.20 µg/m³

O₃ 37.91 ppb

NO₂ 17.25 ppb

SO₂ 1.90 ppb

CO 181.18 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