Hourly Weather | Today Wednesday, March 18, 2026
St. Petersburg, Florida
2 AM
Cloudy Night
55°
Feels Like 46°
0
Humidity: 49%
UV Index: 0
Wind: 16 mph
3 AM
Cloudy Night
54°
Feels Like 46°
0
Humidity: 50%
UV Index: 0
Wind: 16 mph
4 AM
Cloudy Night
54°
Feels Like 46°
0
Humidity: 51%
UV Index: 0
Wind: 16 mph
5 AM
Cloudy Night
54°
Feels Like 46°
0
Humidity: 53%
UV Index: 0
Wind: 15 mph
6 AM
Cloudy Night
54°
Feels Like 45°
0
Humidity: 52%
UV Index: 0
Wind: 15 mph
7 AM
Cloudy Night
54°
Feels Like 45°
0
Humidity: 53%
UV Index: 0
Wind: 15 mph
8 AM
Cloudy Weather
54°
Feels Like 46°
0
Humidity: 52%
UV Index: 1
Wind: 14 mph
9 AM
Cloudy Weather
55°
Feels Like 50°
0
Humidity: 50%
UV Index: 2
Wind: 15 mph
10 AM
Cloudy Weather
55°
Feels Like 54°
0
Humidity: 49%
UV Index: 4
Wind: 15 mph
11 AM
Cloudy Weather
57°
Feels Like 57°
0
Humidity: 47%
UV Index: 5
Wind: 15 mph
12 PM
Cloudy Weather
61°
Feels Like 63°
0
Humidity: 45%
UV Index: 7
Wind: 14 mph
1 PM
Cloudy Weather
64°
Feels Like 68°
0
Humidity: 43%
UV Index: 8
Wind: 13 mph
2 PM
Cloudy Weather
66°
Feels Like 72°
0
Humidity: 41%
UV Index: 7
Wind: 12 mph
3 PM
Cloudy Weather
68°
Feels Like 72°
0
Humidity: 39%
UV Index: 5
Wind: 10 mph
4 PM
Cloudy Weather
70°
Feels Like 70°
0
Humidity: 37%
UV Index: 4
Wind: 10 mph
5 PM
Cloudy Weather
72°
Feels Like 70°
0
Humidity: 35%
UV Index: 2
Wind: 12 mph
6 PM
Cloudy Weather
70°
Feels Like 66°
0
Humidity: 38%
UV Index: 1
Wind: 12 mph
7 PM
Cloudy Weather
68°
Feels Like 64°
0
Humidity: 41%
UV Index: 0
Wind: 13 mph
8 PM
Cloudy Night
66°
Feels Like 63°
0
Humidity: 45%
UV Index: 0
Wind: 13 mph
9 PM
Cloudy Night
64°
Feels Like 61°
0
Humidity: 50%
UV Index: 0
Wind: 13 mph
10 PM
Cloudy Night
63°
Feels Like 59°
0
Humidity: 55%
UV Index: 0
Wind: 14 mph
11 PM
Cloudy Night
63°
Feels Like 57°
0
Humidity: 59%
UV Index: 0
Wind: 14 mph

Hourly Air Quality Forecast - AQI (US EPA)

2 AM
79 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.34 µg/m³
  • PM10: 4.84 µg/m³
  • O3: 0.063 ppm
  • NO2: 0.2 ppb
  • SO2: 0.2 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

3 AM
79 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.25 µg/m³
  • PM10: 4.12 µg/m³
  • O3: 0.063 ppm
  • NO2: 0.4 ppb
  • SO2: 0.2 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

4 AM
78 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.16 µg/m³
  • PM10: 3.6 µg/m³
  • O3: 0.063 ppm
  • NO2: 0.4 ppb
  • SO2: 0.2 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
74 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.17 µg/m³
  • PM10: 3.33 µg/m³
  • O3: 0.062 ppm
  • NO2: 0.5 ppb
  • SO2: 0.2 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
70 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.36 µg/m³
  • PM10: 3.42 µg/m³
  • O3: 0.060 ppm
  • NO2: 0.6 ppb
  • SO2: 0.2 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
65 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.72 µg/m³
  • PM10: 3.83 µg/m³
  • O3: 0.059 ppm
  • NO2: 0.7 ppb
  • SO2: 0.3 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
62 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 2.03 µg/m³
  • PM10: 4.17 µg/m³
  • O3: 0.058 ppm
  • NO2: 0.7 ppb
  • SO2: 0.4 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
60 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 2.21 µg/m³
  • PM10: 4.32 µg/m³
  • O3: 0.057 ppm
  • NO2: 1.1 ppb
  • SO2: 0.5 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
63 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 2.3 µg/m³
  • PM10: 4.46 µg/m³
  • O3: 0.058 ppm
  • NO2: 1.1 ppb
  • SO2: 0.5 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
68 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 2.46 µg/m³
  • PM10: 4.78 µg/m³
  • O3: 0.060 ppm
  • NO2: 1 ppb
  • SO2: 0.6 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
78 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 2.78 µg/m³
  • PM10: 5.32 µg/m³
  • O3: 0.063 ppm
  • NO2: 0.7 ppb
  • SO2: 0.6 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
88 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.19 µg/m³
  • PM10: 5.89 µg/m³
  • O3: 0.066 ppm
  • NO2: 0.5 ppb
  • SO2: 0.6 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.

2 PM
96 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.53 µg/m³
  • PM10: 6.32 µg/m³
  • O3: 0.069 ppm
  • NO2: 0.3 ppb
  • SO2: 0.6 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.

3 PM
102 AQI
Unhealthy air quality for sensitive groups Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.75 µg/m³
  • PM10: 6.69 µg/m³
  • O3: 0.071 ppm
  • NO2: 0.2 ppb
  • SO2: 0.5 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

4 PM
104 AQI
Unhealthy air quality for sensitive groups Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 3.96 µg/m³
  • PM10: 7.09 µg/m³
  • O3: 0.071 ppm
  • NO2: 0.2 ppb
  • SO2: 0.5 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

5 PM
105 AQI
Unhealthy air quality for sensitive groups Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.11 µg/m³
  • PM10: 7.34 µg/m³
  • O3: 0.072 ppm
  • NO2: 0.2 ppb
  • SO2: 0.5 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

6 PM
108 AQI
Unhealthy air quality for sensitive groups Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.22 µg/m³
  • PM10: 7.62 µg/m³
  • O3: 0.073 ppm
  • NO2: 0.2 ppb
  • SO2: 0.5 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

7 PM
109 AQI
Unhealthy air quality for sensitive groups Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.34 µg/m³
  • PM10: 8.2 µg/m³
  • O3: 0.073 ppm
  • NO2: 0.3 ppb
  • SO2: 0.5 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

8 PM
107 AQI
Unhealthy air quality for sensitive groups Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.5 µg/m³
  • PM10: 9.05 µg/m³
  • O3: 0.072 ppm
  • NO2: 0.3 ppb
  • SO2: 0.6 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

9 PM
104 AQI
Unhealthy air quality for sensitive groups Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.66 µg/m³
  • PM10: 9.73 µg/m³
  • O3: 0.071 ppm
  • NO2: 0.4 ppb
  • SO2: 0.6 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

10 PM
103 AQI
Unhealthy air quality for sensitive groups Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.71 µg/m³
  • PM10: 9.63 µg/m³
  • O3: 0.071 ppm
  • NO2: 0.4 ppb
  • SO2: 0.6 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

11 PM
102 AQI
Unhealthy air quality for sensitive groups Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.68 µg/m³
  • PM10: 9.15 µg/m³
  • O3: 0.071 ppm
  • NO2: 0.5 ppb
  • SO2: 0.6 ppb
  • CO: 0.12 ppm

Health Recommendations:

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