Hourly Weather | Today Wednesday, August 12, 2026
Portland, Maine
8 AM
Sunny Weather
63°
Feels Like 63°
7
Humidity: 90%
UV Index: 2
Wind: 7 mph
9 AM
Sunny Weather
64°
Feels Like 66°
7
Humidity: 83%
UV Index: 3
Wind: 7 mph
10 AM
Sunny Weather
70°
Feels Like 73°
7
Humidity: 71%
UV Index: 4
Wind: 6 mph
11 AM
Cloudy Weather
73°
Feels Like 79°
7
Humidity: 60%
UV Index: 5
Wind: 7 mph
12 PM
Cloudy Weather
77°
Feels Like 84°
7
Humidity: 51%
UV Index: 7
Wind: 7 mph
1 PM
Cloudy Weather
81°
Feels Like 88°
6
Humidity: 46%
UV Index: 8
Wind: 8 mph
2 PM
Cloudy Weather
81°
Feels Like 84°
5
Humidity: 48%
UV Index: 7
Wind: 8 mph
3 PM
Cloudy Weather
81°
Feels Like 82°
5
Humidity: 49%
UV Index: 5
Wind: 9 mph
4 PM
Cloudy Weather
79°
Feels Like 81°
6
Humidity: 51%
UV Index: 4
Wind: 9 mph
5 PM
Cloudy Weather
79°
Feels Like 79°
7
Humidity: 54%
UV Index: 3
Wind: 9 mph
6 PM
Cloudy Weather
77°
Feels Like 77°
7
Humidity: 57%
UV Index: 2
Wind: 9 mph
7 PM
Cloudy Weather
75°
Feels Like 73°
10
Humidity: 62%
UV Index: 1
Wind: 7 mph
8 PM
Cloudy Night
73°
Feels Like 72°
15
Humidity: 67%
UV Index: 0
Wind: 7 mph
9 PM
Cloudy Night
72°
Feels Like 70°
15
Humidity: 71%
UV Index: 0
Wind: 6 mph
10 PM
Cloudy Night
70°
Feels Like 66°
19
Humidity: 77%
UV Index: 0
Wind: 6 mph
11 PM
Stormy Weather
68°
Feels Like 63°
51
Humidity: 81%
UV Index: 0
Wind: 6 mph

Hourly Air Quality Forecast - AQI (US EPA)

8 AM
8 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.5 µg/m³
  • PM10: 2.17 µg/m³
  • O3: 0.009 ppm
  • NO2: 4.7 ppb
  • SO2: 0.4 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

9 AM
25 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.88 µg/m³
  • PM10: 1.08 µg/m³
  • O3: 0.027 ppm
  • NO2: 1.8 ppb
  • SO2: 0.4 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

10 AM
28 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.77 µg/m³
  • PM10: 0.92 µg/m³
  • O3: 0.031 ppm
  • NO2: 1.1 ppb
  • SO2: 0.3 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

11 AM
31 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.87 µg/m³
  • PM10: 1 µg/m³
  • O3: 0.033 ppm
  • NO2: 0.9 ppb
  • SO2: 0.2 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

12 PM
33 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.02 µg/m³
  • PM10: 1.14 µg/m³
  • O3: 0.036 ppm
  • NO2: 0.7 ppb
  • SO2: 0.2 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.2 µg/m³
  • PM10: 1.32 µg/m³
  • O3: 0.038 ppm
  • NO2: 0.7 ppb
  • SO2: 0.2 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.36 µg/m³
  • PM10: 1.48 µg/m³
  • O3: 0.040 ppm
  • NO2: 0.7 ppb
  • SO2: 0.2 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.66 µg/m³
  • PM10: 1.81 µg/m³
  • O3: 0.041 ppm
  • NO2: 1 ppb
  • SO2: 0.3 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.08 µg/m³
  • PM10: 2.28 µg/m³
  • O3: 0.041 ppm
  • NO2: 1.5 ppb
  • SO2: 0.4 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.36 µg/m³
  • PM10: 2.6 µg/m³
  • O3: 0.040 ppm
  • NO2: 2.1 ppb
  • SO2: 0.4 ppb
  • CO: 0.10 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.56 µg/m³
  • PM10: 2.85 µg/m³
  • O3: 0.038 ppm
  • NO2: 3.2 ppb
  • SO2: 0.5 ppb
  • CO: 0.11 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.69 µg/m³
  • PM10: 3.08 µg/m³
  • O3: 0.034 ppm
  • NO2: 4.6 ppb
  • SO2: 0.5 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.65 µg/m³
  • PM10: 3.15 µg/m³
  • O3: 0.030 ppm
  • NO2: 5.6 ppb
  • SO2: 0.5 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

9 PM
25 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 2.51 µg/m³
  • PM10: 3.13 µg/m³
  • O3: 0.027 ppm
  • NO2: 6.1 ppb
  • SO2: 0.5 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

10 PM
22 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 2.24 µg/m³
  • PM10: 2.99 µg/m³
  • O3: 0.024 ppm
  • NO2: 6.8 ppb
  • SO2: 0.5 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

11 PM
20 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.9 µg/m³
  • PM10: 2.7 µg/m³
  • O3: 0.022 ppm
  • NO2: 7 ppb
  • SO2: 0.5 ppb
  • CO: 0.13 ppm

Health Recommendations:

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