Hourly Weather | Today Thursday, June 11, 2026
South Portland, Maine
1 PM
Cloudy Weather
73°
Feels Like 79°
44
Humidity: 86%
UV Index: 3
Wind: 7 mph
2 PM
Stormy Weather
73°
Feels Like 73°
51
Humidity: 85%
UV Index: 2
Wind: 7 mph
3 PM
Cloudy Weather
75°
Feels Like 79°
47
Humidity: 80%
UV Index: 2
Wind: 8 mph
4 PM
Cloudy Weather
73°
Feels Like 77°
40
Humidity: 86%
UV Index: 1
Wind: 8 mph
5 PM
Cloudy Weather
73°
Feels Like 75°
34
Humidity: 84%
UV Index: 1
Wind: 8 mph
6 PM
Cloudy Weather
72°
Feels Like 73°
34
Humidity: 87%
UV Index: 1
Wind: 8 mph
7 PM
Cloudy Weather
70°
Feels Like 70°
34
Humidity: 90%
UV Index: 0
Wind: 7 mph
8 PM
Cloudy Weather
70°
Feels Like 70°
34
Humidity: 88%
UV Index: 0
Wind: 6 mph
9 PM
Cloudy Weather
68°
Feels Like 66°
34
Humidity: 91%
UV Index: 0
Wind: 6 mph
10 PM
Cloudy Weather
66°
Feels Like 64°
40
Humidity: 94%
UV Index: 0
Wind: 4 mph
11 PM
Stormy Weather
64°
Feels Like 63°
51
Humidity: 96%
UV Index: 0
Wind: 4 mph

Hourly Air Quality Forecast - AQI (US EPA)

1 PM
46 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.54 µg/m³
  • PM10: 4.72 µg/m³
  • O3: 0.050 ppm
  • NO2: 0.7 ppb
  • SO2: 0.2 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

2 PM
46 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.43 µg/m³
  • PM10: 4.6 µg/m³
  • O3: 0.050 ppm
  • NO2: 0.8 ppb
  • SO2: 0.2 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

3 PM
45 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 5.03 µg/m³
  • PM10: 5.28 µg/m³
  • O3: 0.048 ppm
  • NO2: 1.3 ppb
  • SO2: 0.3 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

4 PM
43 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 5.87 µg/m³
  • PM10: 6.2 µg/m³
  • O3: 0.047 ppm
  • NO2: 1.9 ppb
  • SO2: 0.3 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

5 PM
42 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 6.31 µg/m³
  • PM10: 6.72 µg/m³
  • O3: 0.045 ppm
  • NO2: 2.6 ppb
  • SO2: 0.3 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

6 PM
39 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 6.85 µg/m³
  • PM10: 7.35 µg/m³
  • O3: 0.042 ppm
  • NO2: 3.7 ppb
  • SO2: 0.4 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

7 PM
35 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 7.22 µg/m³
  • PM10: 7.85 µg/m³
  • O3: 0.038 ppm
  • NO2: 5 ppb
  • SO2: 0.4 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

8 PM
31 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 7.1 µg/m³
  • PM10: 7.83 µg/m³
  • O3: 0.033 ppm
  • NO2: 6 ppb
  • SO2: 0.4 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.8 µg/m³
  • PM10: 7.63 µg/m³
  • O3: 0.029 ppm
  • NO2: 6.3 ppb
  • SO2: 0.3 ppb
  • CO: 0.17 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.14 µg/m³
  • PM10: 7.03 µg/m³
  • O3: 0.025 ppm
  • NO2: 6.5 ppb
  • SO2: 0.3 ppb
  • CO: 0.17 ppm

Health Recommendations:

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

11 PM
21 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 5.13 µg/m³
  • PM10: 6.02 µg/m³
  • O3: 0.021 ppm
  • NO2: 6.7 ppb
  • SO2: 0.3 ppb
  • CO: 0.17 ppm

Health Recommendations:

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