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Today Hourly 7 days 30 days Air Quality
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Hourly Weather | Today › Saturday, August 29, 2026
Active Weather Warnings
Lake Forest, California
3 AM
Night
73°
Feels Like 75°
0
Humidity: 79%
UV Index: 0
Wind: 4 mph
4 AM
Cloudy Night
73°
Feels Like 75°
0
Humidity: 80%
UV Index: 0
Wind: 4 mph
5 AM
Cloudy Night
73°
Feels Like 75°
0
Humidity: 81%
UV Index: 0
Wind: 4 mph
6 AM
Cloudy Night
72°
Feels Like 73°
0
Humidity: 82%
UV Index: 0
Wind: 2 mph
7 AM
Cloudy Weather
72°
Feels Like 73°
0
Humidity: 84%
UV Index: 0
Wind: 4 mph
8 AM
Cloudy Weather
75°
Feels Like 81°
0
Humidity: 74%
UV Index: 2
Wind: 4 mph
9 AM
Cloudy Weather
81°
Feels Like 88°
0
Humidity: 65%
UV Index: 3
Wind: 5 mph
10 AM
Cloudy Weather
84°
Feels Like 91°
0
Humidity: 57%
UV Index: 4
Wind: 6 mph
11 AM
Sunny Weather
88°
Feels Like 97°
0
Humidity: 50%
UV Index: 6
Wind: 6 mph
12 PM
Cloudy Weather
91°
Feels Like 100°
0
Humidity: 46%
UV Index: 8
Wind: 7 mph
1 PM
Cloudy Weather
93°
Feels Like 100°
0
Humidity: 42%
UV Index: 9
Wind: 8 mph
2 PM
Cloudy Weather
95°
Feels Like 100°
0
Humidity: 39%
UV Index: 8
Wind: 9 mph
3 PM
Cloudy Weather
93°
Feels Like 99°
0
Humidity: 40%
UV Index: 6
Wind: 9 mph
4 PM
Cloudy Weather
91°
Feels Like 95°
0
Humidity: 41%
UV Index: 4
Wind: 9 mph
5 PM
Cloudy Weather
90°
Feels Like 91°
0
Humidity: 44%
UV Index: 3
Wind: 8 mph
6 PM
Cloudy Weather
88°
Feels Like 88°
0
Humidity: 48%
UV Index: 2
Wind: 8 mph
7 PM
Cloudy Weather
84°
Feels Like 84°
0
Humidity: 54%
UV Index: 0
Wind: 6 mph
8 PM
Cloudy Night
81°
Feels Like 82°
0
Humidity: 61%
UV Index: 0
Wind: 6 mph
9 PM
Cloudy Night
79°
Feels Like 81°
0
Humidity: 68%
UV Index: 0
Wind: 6 mph
10 PM
Cloudy Night
75°
Feels Like 77°
0
Humidity: 74%
UV Index: 0
Wind: 5 mph
11 PM
Cloudy Night
73°
Feels Like 75°
0
Humidity: 80%
UV Index: 0
Wind: 6 mph

Hourly Air Quality Forecast - AQI (US EPA)

3 AM
112 AQI
Unhealthy air quality for sensitive groups Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 40.36 µg/m³
  • PM10: 58.86 µg/m³
  • O3: 0.045 ppm
  • NO2: 0.5 ppb
  • SO2: 0.2 ppb
  • CO: 0.14 ppm

Health Recommendations:

Members of sensitive groups may experience health effects. The general public is less likely to be affected.

4 AM
135 AQI
Unhealthy air quality for sensitive groups Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 49.43 µg/m³
  • PM10: 68.13 µg/m³
  • O3: 0.044 ppm
  • NO2: 0.6 ppb
  • SO2: 0.2 ppb
  • CO: 0.15 ppm

Health Recommendations:

Members of sensitive groups may experience health effects. The general public is less likely to be affected.

5 AM
151 AQI
Unhealthy air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 56.77 µg/m³
  • PM10: 75.59 µg/m³
  • O3: 0.042 ppm
  • NO2: 0.6 ppb
  • SO2: 0.2 ppb
  • CO: 0.16 ppm

Health Recommendations:

Everyone may begin to experience health effects; sensitive groups may experience more serious effects.

6 AM
153 AQI
Unhealthy air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 61.1 µg/m³
  • PM10: 79.89 µg/m³
  • O3: 0.039 ppm
  • NO2: 0.6 ppb
  • SO2: 0.2 ppb
  • CO: 0.17 ppm

Health Recommendations:

Everyone may begin to experience health effects; sensitive groups may experience more serious effects.

7 AM
154 AQI
Unhealthy air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 62.26 µg/m³
  • PM10: 81.03 µg/m³
  • O3: 0.037 ppm
  • NO2: 0.7 ppb
  • SO2: 0.2 ppb
  • CO: 0.17 ppm

Health Recommendations:

Everyone may begin to experience health effects; sensitive groups may experience more serious effects.

8 AM
152 AQI
Unhealthy air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 59.66 µg/m³
  • PM10: 78.53 µg/m³
  • O3: 0.034 ppm
  • NO2: 0.7 ppb
  • SO2: 0.2 ppb
  • CO: 0.16 ppm

Health Recommendations:

Everyone may begin to experience health effects; sensitive groups may experience more serious effects.

9 AM
148 AQI
Unhealthy air quality for sensitive groups Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 54.51 µg/m³
  • PM10: 73.52 µg/m³
  • O3: 0.034 ppm
  • NO2: 0.7 ppb
  • SO2: 0.2 ppb
  • CO: 0.15 ppm

Health Recommendations:

Members of sensitive groups may experience health effects. The general public is less likely to be affected.

10 AM
130 AQI
Unhealthy air quality for sensitive groups Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 47.49 µg/m³
  • PM10: 66.84 µg/m³
  • O3: 0.035 ppm
  • NO2: 0.5 ppb
  • SO2: 0.2 ppb
  • CO: 0.14 ppm

Health Recommendations:

Members of sensitive groups may experience health effects. The general public is less likely to be affected.

11 AM
109 AQI
Unhealthy air quality for sensitive groups Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 39.05 µg/m³
  • PM10: 58.77 µg/m³
  • O3: 0.037 ppm
  • NO2: 0.4 ppb
  • SO2: 0.2 ppb
  • CO: 0.13 ppm

Health Recommendations:

Members of sensitive groups may experience health effects. The general public is less likely to be affected.

12 PM
90 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 30.6 µg/m³
  • PM10: 50.53 µg/m³
  • O3: 0.038 ppm
  • NO2: 0.3 ppb
  • SO2: 0.2 ppb
  • CO: 0.11 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

1 PM
76 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 24.22 µg/m³
  • PM10: 44.49 µg/m³
  • O3: 0.038 ppm
  • NO2: 0.2 ppb
  • SO2: 0.2 ppb
  • CO: 0.10 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

2 PM
67 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 20.18 µg/m³
  • PM10: 40.82 µg/m³
  • O3: 0.038 ppm
  • NO2: 0.2 ppb
  • SO2: 0.2 ppb
  • CO: 0.09 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

3 PM
63 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 17.86 µg/m³
  • PM10: 38.93 µg/m³
  • O3: 0.039 ppm
  • NO2: 0.2 ppb
  • SO2: 0.2 ppb
  • CO: 0.09 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

4 PM
59 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 16.43 µg/m³
  • PM10: 37.87 µg/m³
  • O3: 0.039 ppm
  • NO2: 0.2 ppb
  • SO2: 0.2 ppb
  • CO: 0.09 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

5 PM
57 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 15.42 µg/m³
  • PM10: 36.9 µg/m³
  • O3: 0.040 ppm
  • NO2: 0.2 ppb
  • SO2: 0.2 ppb
  • CO: 0.08 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

6 PM
56 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 14.6 µg/m³
  • PM10: 35.76 µg/m³
  • O3: 0.041 ppm
  • NO2: 0.2 ppb
  • SO2: 0.2 ppb
  • CO: 0.08 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

7 PM
53 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 13.46 µg/m³
  • PM10: 34.49 µg/m³
  • O3: 0.042 ppm
  • NO2: 0.3 ppb
  • SO2: 0.2 ppb
  • CO: 0.08 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

8 PM
50 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 12.08 µg/m³
  • PM10: 33.15 µg/m³
  • O3: 0.043 ppm
  • NO2: 0.3 ppb
  • SO2: 0.2 ppb
  • CO: 0.08 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

9 PM
47 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 11.23 µg/m³
  • PM10: 32.6 µg/m³
  • O3: 0.044 ppm
  • NO2: 0.3 ppb
  • SO2: 0.2 ppb
  • CO: 0.08 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

10 PM
50 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 11.88 µg/m³
  • PM10: 33.79 µg/m³
  • O3: 0.046 ppm
  • NO2: 0.3 ppb
  • SO2: 0.2 ppb
  • CO: 0.08 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

11 PM
56 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 14.95 µg/m³
  • PM10: 37.66 µg/m³
  • O3: 0.047 ppm
  • NO2: 0.3 ppb
  • SO2: 0.2 ppb
  • CO: 0.09 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

Current Real-Time Air Quality Report

Weather Alerts and Warnings for Lake Forest

Severe Expected Likely

Extreme Heat Warning

Extreme Heat Warning issued August 28 at 9:06PM PDT until August 29 at 8:00PM PDT by NWS San Diego CA
Aug 28, 9:06 PM → Aug 29, 8:00 PM
WHAT: Hot conditions continue into Saturday with highs up to 95.
Low temperatures will be in the low 70s.

WHERE: Orange County Inland Areas.

WHEN: Until 8 PM PDT Saturday.

IMPACTS: Heat related illnesses increase significantly during
extreme heat events.

ADDITIONAL DETAILS: Temperatures will fall to below normal by
Sunday.
+ Read More
Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes.
Updated: Aug 29, 1:14 AM Source: NWS Alert

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