❮
Today Hourly 7 days 30 days Air Quality
❯
Hourly Weather | Today › Tuesday, March 17, 2026
Active Weather Warnings
Carlsbad, California
3 AM
Night
52°
Feels Like 54°
0
Humidity: 88%
UV Index: 0
Wind: 2 mph
4 AM
Night
52°
Feels Like 52°
0
Humidity: 85%
UV Index: 0
Wind: 2 mph
5 AM
Cloudy Night
50°
Feels Like 52°
0
Humidity: 85%
UV Index: 0
Wind: 4 mph
6 AM
Cloudy Night
48°
Feels Like 50°
0
Humidity: 87%
UV Index: 0
Wind: 4 mph
7 AM
Cloudy Weather
52°
Feels Like 54°
0
Humidity: 76%
UV Index: 0
Wind: 4 mph
8 AM
Cloudy Weather
55°
Feels Like 57°
0
Humidity: 67%
UV Index: 1
Wind: 5 mph
9 AM
Cloudy Weather
63°
Feels Like 66°
0
Humidity: 57%
UV Index: 2
Wind: 5 mph
10 AM
Cloudy Weather
73°
Feels Like 75°
0
Humidity: 44%
UV Index: 3
Wind: 6 mph
11 AM
Cloudy Weather
81°
Feels Like 84°
0
Humidity: 37%
UV Index: 4
Wind: 6 mph
12 PM
Cloudy Weather
82°
Feels Like 86°
0
Humidity: 37%
UV Index: 6
Wind: 8 mph
1 PM
Cloudy Weather
84°
Feels Like 88°
0
Humidity: 37%
UV Index: 6
Wind: 9 mph
2 PM
Cloudy Weather
82°
Feels Like 86°
0
Humidity: 39%
UV Index: 6
Wind: 9 mph
3 PM
Cloudy Weather
82°
Feels Like 84°
0
Humidity: 39%
UV Index: 4
Wind: 9 mph
4 PM
Cloudy Weather
81°
Feels Like 82°
0
Humidity: 39%
UV Index: 3
Wind: 8 mph
5 PM
Cloudy Weather
79°
Feels Like 79°
0
Humidity: 42%
UV Index: 2
Wind: 7 mph
6 PM
Cloudy Weather
75°
Feels Like 73°
0
Humidity: 47%
UV Index: 1
Wind: 7 mph
7 PM
Cloudy Night
72°
Feels Like 68°
0
Humidity: 57%
UV Index: 0
Wind: 6 mph
8 PM
Night
66°
Feels Like 64°
0
Humidity: 63%
UV Index: 0
Wind: 5 mph
9 PM
Night
64°
Feels Like 64°
0
Humidity: 66%
UV Index: 0
Wind: 4 mph
10 PM
Night
63°
Feels Like 63°
0
Humidity: 69%
UV Index: 0
Wind: 2 mph
11 PM
Night
59°
Feels Like 61°
0
Humidity: 73%
UV Index: 0
Wind: 2 mph

Hourly Air Quality Forecast - AQI (US EPA)

3 AM
61 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 17.09 µg/m³
  • PM10: 24.61 µg/m³
  • O3: 0.044 ppm
  • NO2: 0.4 ppb
  • SO2: 0.1 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

4 AM
60 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 16.74 µg/m³
  • PM10: 24.4 µg/m³
  • O3: 0.042 ppm
  • NO2: 0.4 ppb
  • SO2: 0.1 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 16.41 µg/m³
  • PM10: 24.12 µg/m³
  • O3: 0.041 ppm
  • NO2: 0.4 ppb
  • SO2: 0.1 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

6 AM
59 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 16.13 µg/m³
  • PM10: 23.74 µg/m³
  • O3: 0.041 ppm
  • NO2: 0.4 ppb
  • SO2: 0.1 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

7 AM
58 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 15.77 µg/m³
  • PM10: 23.17 µg/m³
  • O3: 0.040 ppm
  • NO2: 0.5 ppb
  • SO2: 0.1 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 15.3 µg/m³
  • PM10: 22.46 µg/m³
  • O3: 0.039 ppm
  • NO2: 0.5 ppb
  • SO2: 0.1 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

9 AM
56 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 14.91 µg/m³
  • PM10: 21.86 µg/m³
  • O3: 0.039 ppm
  • NO2: 0.5 ppb
  • SO2: 0.1 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

10 AM
56 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 14.87 µg/m³
  • PM10: 21.73 µg/m³
  • O3: 0.040 ppm
  • NO2: 0.4 ppb
  • SO2: 0.1 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 15.29 µg/m³
  • PM10: 22.28 µg/m³
  • O3: 0.042 ppm
  • NO2: 0.4 ppb
  • SO2: 0.1 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 16.11 µg/m³
  • PM10: 23.44 µg/m³
  • O3: 0.043 ppm
  • NO2: 0.3 ppb
  • SO2: 0.1 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 17.14 µg/m³
  • PM10: 24.89 µg/m³
  • O3: 0.045 ppm
  • NO2: 0.2 ppb
  • SO2: 0.1 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 18.29 µg/m³
  • PM10: 26.59 µg/m³
  • O3: 0.047 ppm
  • NO2: 0.2 ppb
  • SO2: 0.2 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 19.82 µg/m³
  • PM10: 28.83 µg/m³
  • O3: 0.049 ppm
  • NO2: 0.2 ppb
  • SO2: 0.2 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 21.72 µg/m³
  • PM10: 31.55 µg/m³
  • O3: 0.050 ppm
  • NO2: 0.2 ppb
  • SO2: 0.2 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 23.58 µg/m³
  • PM10: 34.2 µg/m³
  • O3: 0.053 ppm
  • NO2: 0.3 ppb
  • SO2: 0.2 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 24.8 µg/m³
  • PM10: 35.98 µg/m³
  • O3: 0.055 ppm
  • NO2: 0.3 ppb
  • SO2: 0.2 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 25.15 µg/m³
  • PM10: 36.81 µg/m³
  • O3: 0.056 ppm
  • NO2: 0.4 ppb
  • SO2: 0.2 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 24.93 µg/m³
  • PM10: 37.09 µg/m³
  • O3: 0.056 ppm
  • NO2: 0.5 ppb
  • SO2: 0.2 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 24.56 µg/m³
  • PM10: 37.04 µg/m³
  • O3: 0.054 ppm
  • NO2: 0.5 ppb
  • SO2: 0.2 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 24.34 µg/m³
  • PM10: 36.93 µg/m³
  • O3: 0.053 ppm
  • NO2: 0.6 ppb
  • SO2: 0.2 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 24.27 µg/m³
  • PM10: 36.86 µg/m³
  • O3: 0.051 ppm
  • NO2: 0.6 ppb
  • SO2: 0.2 ppb
  • CO: 0.16 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 Carlsbad

Severe Future Likely

Extreme Heat Watch

Extreme Heat Watch issued March 14 at 5:51AM PDT until March 20 at 8:00PM PDT by NWS San Diego CA
Mar 16, 10:00 AM → Mar 20, 8:00 PM
WHAT: Dangerously hot conditions with temperatures 85 to 90 near
the coast, up to 105 inland.

WHERE: Orange County Coastal Areas, Orange County Inland Areas,
San Bernardino and Riverside County Valleys-The Inland Empire, San
Diego County Coastal Areas, San Diego County Valleys, and Santa
Ana Mountains and Foothills.

WHEN: From Monday morning through Friday evening.

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

ADDITIONAL DETAILS: High temperatures next week will be 20 to
potentially 30 degrees above
normal for this time of year, where record breaking heat is likely.
+ 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: Mar 14, 10:34 AM Source: NWS Alert
Moderate Expected Likely

Beach Hazards Statement

Beach Hazards Statement issued March 17 at 1:49AM PDT until March 18 at 11:00PM PDT by NWS San Diego CA
Mar 17, 1:49 AM → Mar 18, 11:00 PM
WHAT: Surf of 2 to 4 feet, with sets up to 6 feet. Highest surf
in Orange County.

WHERE: Orange County Coastal Areas and San Diego County Coastal
Areas.

WHEN: Through Wednesday evening.

IMPACTS: Moderate rip current risk and locally hazardous
swimming conditions.
+ Read More
A beach hazards statement is issued when threats such as rip currents and other hazards are elevated. Caution should be used when in or near the water.
Updated: Mar 17, 2:29 AM Source: NWS Alert
Moderate Expected Likely

Heat Advisory

Heat Advisory issued March 17 at 12:33AM PDT until March 20 at 8:00PM PDT by NWS San Diego CA
Mar 17, 12:33 AM → Mar 20, 8:00 PM
WHAT: High temperatures in the mid 80s to lower 90s for inland
coastal areas and near higher coastal terrain expected.

WHERE: San Diego County Coastal Areas.

WHEN: Until 8 PM PDT Friday.

IMPACTS: Hot temperatures may cause heat illnesses.
+ 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. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke.
Updated: Mar 17, 2:29 AM Source: NWS Alert

Explore U.S. Weather Trends

❄️ Coldest Cities in the U.S. – Live Temperature Rankings 🔥 Hottest Cities Today – Real-Time Heat Observations ⚠️ Active Weather Alerts – Warnings, Watches & Advisories 🌪️ Windiest Cities – Highest Sustained Wind Speeds 🌫️ Worst Air Quality – Cities with the Highest AQI 🍃 Best Air Quality – Cities with the Lowest AQI