Today | Weather | Thursday, December 4, 2025

Weather in El Cajon, California

01:30 AM
Now
Cloudy Night
55° F
Feels Like 55°
Precipitation 0 %
Wind 5 mph
Humidity 31 %
Today
Cloudy Weather
Day 73°
Night 41°
Precipitation 0 %
Wind 6 mph
UV Index (0 - 11+) 3

El Cajon Weather Forecast Updated

47 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (December 4, 2024)
Cloudy Night

Day

66°

Night

41°

Wind

4 mph

Precipitation

0 %

Air Quality in El Cajon

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

Pollutant Concentrations:

PM2.5 13.34 µg/m³
PM10 22.18 µg/m³
O3 0.055 ppm
NO2 0.8 ppb
SO2 0.4 ppb
CO 0.15 ppm
NH3 0.29 µg/m³
NO 0 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 acceptable; however, for some pollutants, there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.

Show raw pollutant concentrations (µg/m³)
PM2.513.34 µg/m³
PM1022.18 µg/m³
O3107.62 µg/m³
NO21.52 µg/m³
SO21.11 µg/m³
CO175.48 µg/m³
NH30.29 µg/m³
NO0 µg/m³