Hourly Weather | Today Friday, January 16, 2026
Portland, Maine
7 AM
Cloudy Night
25°
Feels Like 10°
0
Humidity: 49%
Wind: 14 mph
UV Index: 0
8 AM
Cloudy Weather
23°
Feels Like
0
Humidity: 49%
Wind: 15 mph
UV Index: 0
9 AM
Cloudy Weather
23°
Feels Like
0
Humidity: 46%
Wind: 15 mph
UV Index: 1
10 AM
Cloudy Weather
23°
Feels Like
0
Humidity: 44%
Wind: 16 mph
UV Index: 2
11 AM
Cloudy Weather
25°
Feels Like 10°
0
Humidity: 42%
Wind: 17 mph
UV Index: 2
12 PM
Cloudy Weather
27°
Feels Like 10°
0
Humidity: 42%
Wind: 18 mph
UV Index: 2
1 PM
Cloudy Weather
27°
Feels Like 12°
0
Humidity: 42%
Wind: 16 mph
UV Index: 2
2 PM
Cloudy Weather
27°
Feels Like 12°
0
Humidity: 42%
Wind: 16 mph
UV Index: 2
3 PM
Cloudy Weather
27°
Feels Like 14°
0
Humidity: 43%
Wind: 14 mph
UV Index: 1
4 PM
Cloudy Weather
27°
Feels Like 16°
0
Humidity: 42%
Wind: 13 mph
UV Index: 0
5 PM
Cloudy Night
27°
Feels Like 16°
0
Humidity: 45%
Wind: 10 mph
UV Index: 0
6 PM
Cloudy Night
25°
Feels Like 16°
0
Humidity: 45%
Wind: 10 mph
UV Index: 0
7 PM
Cloudy Night
27°
Feels Like 10°
0
Humidity: 43%
Wind: 15 mph
UV Index: 0
8 PM
Cloudy Night
27°
Feels Like 10°
0
Humidity: 43%
Wind: 14 mph
UV Index: 0
9 PM
Cloudy Night
27°
Feels Like 12°
0
Humidity: 44%
Wind: 13 mph
UV Index: 0
10 PM
Cloudy Night
25°
Feels Like 12°
0
Humidity: 44%
Wind: 13 mph
UV Index: 0
11 PM
Cloudy Night
25°
Feels Like 12°
0
Humidity: 45%
Wind: 12 mph
UV Index: 0

Hourly Air Quality Forecast - AQI (US EPA)

7 AM
33 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.52 µg/m³
  • PM10: 1.07 µg/m³
  • O3: 0.036 ppm
  • NO2: 2.1 ppb
  • SO2: 0.3 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.69 µg/m³
  • PM10: 1.38 µg/m³
  • O3: 0.037 ppm
  • NO2: 2.7 ppb
  • SO2: 0.3 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.75 µg/m³
  • PM10: 1.46 µg/m³
  • O3: 0.038 ppm
  • NO2: 2.7 ppb
  • SO2: 0.3 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.69 µg/m³
  • PM10: 1.34 µg/m³
  • O3: 0.040 ppm
  • NO2: 2.1 ppb
  • SO2: 0.3 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.58 µg/m³
  • PM10: 1.12 µg/m³
  • O3: 0.043 ppm
  • NO2: 1.6 ppb
  • SO2: 0.2 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.56 µg/m³
  • PM10: 1.06 µg/m³
  • O3: 0.044 ppm
  • NO2: 1.5 ppb
  • SO2: 0.2 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.56 µg/m³
  • PM10: 1.04 µg/m³
  • O3: 0.044 ppm
  • NO2: 1.5 ppb
  • SO2: 0.2 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.66 µg/m³
  • PM10: 1.2 µg/m³
  • O3: 0.045 ppm
  • NO2: 1.7 ppb
  • SO2: 0.2 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.89 µg/m³
  • PM10: 1.56 µg/m³
  • O3: 0.044 ppm
  • NO2: 2.4 ppb
  • SO2: 0.3 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.06 µg/m³
  • PM10: 1.86 µg/m³
  • O3: 0.043 ppm
  • NO2: 3.3 ppb
  • SO2: 0.4 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.22 µg/m³
  • PM10: 2.15 µg/m³
  • O3: 0.041 ppm
  • NO2: 4.3 ppb
  • SO2: 0.4 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.48 µg/m³
  • PM10: 2.6 µg/m³
  • O3: 0.039 ppm
  • NO2: 5.2 ppb
  • SO2: 0.5 ppb
  • CO: 0.16 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: 1.92 µg/m³
  • PM10: 3.31 µg/m³
  • O3: 0.038 ppm
  • NO2: 6.1 ppb
  • SO2: 0.5 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.48 µg/m³
  • PM10: 4.12 µg/m³
  • O3: 0.035 ppm
  • NO2: 7 ppb
  • SO2: 0.6 ppb
  • CO: 0.17 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.17 µg/m³
  • PM10: 5.09 µg/m³
  • O3: 0.033 ppm
  • NO2: 8.2 ppb
  • SO2: 0.6 ppb
  • CO: 0.18 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.84 µg/m³
  • PM10: 6.06 µg/m³
  • O3: 0.032 ppm
  • NO2: 9.3 ppb
  • SO2: 0.7 ppb
  • CO: 0.19 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.43 µg/m³
  • PM10: 7.08 µg/m³
  • O3: 0.030 ppm
  • NO2: 10.3 ppb
  • SO2: 0.8 ppb
  • CO: 0.20 ppm

Health Recommendations:

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