Hourly Weather | Today › Monday, November 2, 2026
Portland, Maine
1 AM
Night
43°
Feels Like 39°
0
Humidity: 79%
UV Index: 0
Wind: 7 mph
2 AM
Night
45°
Feels Like 39°
0
Humidity: 77%
UV Index: 0
Wind: 7 mph
3 AM
Night
45°
Feels Like 41°
0
Humidity: 75%
UV Index: 0
Wind: 7 mph
4 AM
Night
46°
Feels Like 41°
0
Humidity: 74%
UV Index: 0
Wind: 8 mph
5 AM
Cloudy Night
46°
Feels Like 43°
0
Humidity: 72%
UV Index: 0
Wind: 7 mph
6 AM
Cloudy Night
46°
Feels Like 43°
0
Humidity: 73%
UV Index: 0
Wind: 7 mph
7 AM
Cloudy Weather
48°
Feels Like 43°
0
Humidity: 69%
UV Index: 0
Wind: 8 mph
8 AM
Cloudy Weather
52°
Feels Like 46°
0
Humidity: 65%
UV Index: 1
Wind: 9 mph
9 AM
Cloudy Weather
55°
Feels Like 54°
0
Humidity: 60%
UV Index: 2
Wind: 9 mph
10 AM
Cloudy Weather
57°
Feels Like 57°
0
Humidity: 55%
UV Index: 2
Wind: 9 mph
11 AM
Cloudy Weather
63°
Feels Like 63°
0
Humidity: 51%
UV Index: 2
Wind: 9 mph
12 PM
Cloudy Weather
64°
Feels Like 66°
0
Humidity: 48%
UV Index: 3
Wind: 9 mph
1 PM
Cloudy Weather
66°
Feels Like 68°
0
Humidity: 44%
UV Index: 2
Wind: 9 mph
2 PM
Cloudy Weather
70°
Feels Like 70°
0
Humidity: 43%
UV Index: 2
Wind: 8 mph
3 PM
Cloudy Weather
66°
Feels Like 66°
0
Humidity: 46%
UV Index: 2
Wind: 8 mph
4 PM
Cloudy Weather
64°
Feels Like 64°
0
Humidity: 51%
UV Index: 1
Wind: 8 mph
5 PM
Cloudy Night
63°
Feels Like 61°
0
Humidity: 55%
UV Index: 0
Wind: 7 mph
6 PM
Cloudy Night
61°
Feels Like 57°
0
Humidity: 61%
UV Index: 0
Wind: 7 mph
7 PM
Cloudy Night
57°
Feels Like 55°
0
Humidity: 65%
UV Index: 0
Wind: 7 mph
8 PM
Cloudy Night
55°
Feels Like 54°
0
Humidity: 68%
UV Index: 0
Wind: 6 mph
9 PM
Cloudy Night
55°
Feels Like 54°
0
Humidity: 70%
UV Index: 0
Wind: 6 mph
10 PM
Cloudy Night
54°
Feels Like 52°
0
Humidity: 73%
UV Index: 0
Wind: 6 mph
11 PM
Cloudy Night
52°
Feels Like 52°
0
Humidity: 76%
UV Index: 0
Wind: 5 mph

Hourly Air Quality Forecast - AQI (US EPA)

1 AM
27 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 4.9 µg/m³
  • PM10: 6.79 µg/m³
  • O3: 0.030 ppm
  • NO2: 7 ppb
  • SO2: 0.3 ppb
  • CO: 0.19 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.98 µg/m³
  • PM10: 6.75 µg/m³
  • O3: 0.030 ppm
  • NO2: 6.1 ppb
  • SO2: 0.4 ppb
  • CO: 0.19 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.19 µg/m³
  • PM10: 6.93 µg/m³
  • O3: 0.030 ppm
  • NO2: 5.5 ppb
  • SO2: 0.4 ppb
  • CO: 0.19 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.42 µg/m³
  • PM10: 7.16 µg/m³
  • O3: 0.030 ppm
  • NO2: 5.2 ppb
  • SO2: 0.4 ppb
  • CO: 0.19 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.53 µg/m³
  • PM10: 7.27 µg/m³
  • O3: 0.031 ppm
  • NO2: 5 ppb
  • SO2: 0.4 ppb
  • CO: 0.19 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.56 µg/m³
  • PM10: 7.32 µg/m³
  • O3: 0.031 ppm
  • NO2: 5.1 ppb
  • SO2: 0.4 ppb
  • CO: 0.19 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.81 µg/m³
  • PM10: 7.82 µg/m³
  • O3: 0.030 ppm
  • NO2: 6.3 ppb
  • SO2: 0.5 ppb
  • CO: 0.19 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.09 µg/m³
  • PM10: 8.46 µg/m³
  • O3: 0.029 ppm
  • NO2: 7.9 ppb
  • SO2: 0.5 ppb
  • CO: 0.21 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.99 µg/m³
  • PM10: 8.59 µg/m³
  • O3: 0.030 ppm
  • NO2: 8.1 ppb
  • SO2: 0.6 ppb
  • CO: 0.21 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.53 µg/m³
  • PM10: 8.12 µg/m³
  • O3: 0.033 ppm
  • NO2: 7.2 ppb
  • SO2: 0.7 ppb
  • CO: 0.21 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.05 µg/m³
  • PM10: 7.42 µg/m³
  • O3: 0.039 ppm
  • NO2: 5.7 ppb
  • SO2: 0.8 ppb
  • CO: 0.19 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.46 µg/m³
  • PM10: 7.82 µg/m³
  • O3: 0.041 ppm
  • NO2: 5.3 ppb
  • SO2: 0.9 ppb
  • CO: 0.18 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.1 µg/m³
  • PM10: 8.41 µg/m³
  • O3: 0.043 ppm
  • NO2: 5 ppb
  • SO2: 0.9 ppb
  • CO: 0.18 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.76 µg/m³
  • PM10: 8.99 µg/m³
  • O3: 0.046 ppm
  • NO2: 4.9 ppb
  • SO2: 0.9 ppb
  • CO: 0.18 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 7.71 µg/m³
  • PM10: 10.06 µg/m³
  • O3: 0.045 ppm
  • NO2: 5.9 ppb
  • SO2: 0.9 ppb
  • CO: 0.18 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: 8.64 µg/m³
  • PM10: 11.19 µg/m³
  • O3: 0.043 ppm
  • NO2: 7.7 ppb
  • SO2: 1 ppb
  • CO: 0.19 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 9.67 µg/m³
  • PM10: 12.49 µg/m³
  • O3: 0.040 ppm
  • NO2: 9.6 ppb
  • SO2: 1.1 ppb
  • CO: 0.21 ppm

Health Recommendations:

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

6 PM
46 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 10.95 µg/m³
  • PM10: 14.14 µg/m³
  • O3: 0.037 ppm
  • NO2: 11.3 ppb
  • SO2: 1.2 ppb
  • CO: 0.23 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 12.32 µg/m³
  • PM10: 15.96 µg/m³
  • O3: 0.035 ppm
  • NO2: 12.9 ppb
  • SO2: 1.2 ppb
  • CO: 0.25 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 13.28 µg/m³
  • PM10: 17.39 µg/m³
  • O3: 0.033 ppm
  • NO2: 13.9 ppb
  • SO2: 1.3 ppb
  • CO: 0.26 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 14.19 µg/m³
  • PM10: 18.81 µg/m³
  • O3: 0.030 ppm
  • NO2: 15 ppb
  • SO2: 1.3 ppb
  • CO: 0.27 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 15 µg/m³
  • PM10: 20.02 µg/m³
  • O3: 0.028 ppm
  • NO2: 15.8 ppb
  • SO2: 1.4 ppb
  • CO: 0.28 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 15.45 µg/m³
  • PM10: 20.62 µg/m³
  • O3: 0.025 ppm
  • NO2: 16.1 ppb
  • SO2: 1.4 ppb
  • CO: 0.29 ppm

Health Recommendations:

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