Hourly Weather | Today Wednesday, March 18, 2026
Nashua, New Hampshire
6 AM
Night
21°
Feels Like 12°
0
Frost Risk: 76%
Humidity: 45%
UV Index: 0
Wind: 9 mph
7 AM
Sunny Weather
21°
Feels Like 12°
0
Frost Risk: 67%
Humidity: 45%
UV Index: 0
Wind: 9 mph
8 AM
Cloudy Weather
25°
Feels Like 16°
0
Humidity: 41%
UV Index: 1
Wind: 9 mph
9 AM
Cloudy Weather
27°
Feels Like 21°
0
Humidity: 33%
UV Index: 2
Wind: 9 mph
10 AM
Cloudy Weather
28°
Feels Like 25°
0
Humidity: 29%
UV Index: 3
Wind: 9 mph
11 AM
Cloudy Weather
30°
Feels Like 28°
0
Humidity: 27%
UV Index: 4
Wind: 9 mph
12 PM
Cloudy Weather
32°
Feels Like 34°
0
Humidity: 25%
UV Index: 4
Wind: 8 mph
1 PM
Cloudy Weather
34°
Feels Like 37°
0
Humidity: 24%
UV Index: 5
Wind: 7 mph
2 PM
Cloudy Weather
34°
Feels Like 39°
0
Humidity: 23%
UV Index: 4
Wind: 6 mph
3 PM
Cloudy Weather
36°
Feels Like 37°
0
Humidity: 23%
UV Index: 4
Wind: 7 mph
4 PM
Cloudy Weather
36°
Feels Like 36°
0
Humidity: 22%
UV Index: 3
Wind: 7 mph
5 PM
Cloudy Weather
36°
Feels Like 36°
0
Humidity: 21%
UV Index: 2
Wind: 7 mph
6 PM
Cloudy Weather
34°
Feels Like 32°
0
Humidity: 25%
UV Index: 1
Wind: 6 mph
7 PM
Cloudy Night
32°
Feels Like 28°
0
Humidity: 30%
UV Index: 0
Wind: 6 mph
8 PM
Cloudy Night
30°
Feels Like 28°
0
Humidity: 37%
UV Index: 0
Wind: 5 mph
9 PM
Cloudy Night
28°
Feels Like 27°
0
Humidity: 47%
UV Index: 0
Wind: 5 mph
10 PM
Cloudy Night
27°
Feels Like 25°
0
Humidity: 57%
UV Index: 0
Wind: 5 mph
11 PM
Cloudy Night
25°
Feels Like 25°
0
Humidity: 63%
UV Index: 0
Wind: 5 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 0.52 µg/m³
  • PM10: 1.06 µg/m³
  • O3: 0.048 ppm
  • NO2: 1.5 ppb
  • SO2: 0.3 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.56 µg/m³
  • PM10: 1.1 µg/m³
  • O3: 0.048 ppm
  • NO2: 1.6 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
44 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.64 µg/m³
  • PM10: 1.19 µg/m³
  • O3: 0.047 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.

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

Pollutant Concentrations:

  • PM2.5: 0.71 µg/m³
  • PM10: 1.22 µg/m³
  • O3: 0.047 ppm
  • NO2: 2.5 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
44 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.66 µg/m³
  • PM10: 1.15 µg/m³
  • O3: 0.048 ppm
  • NO2: 2.3 ppb
  • SO2: 0.3 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.61 µg/m³
  • PM10: 1.08 µg/m³
  • O3: 0.048 ppm
  • NO2: 2 ppb
  • SO2: 0.3 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.57 µg/m³
  • PM10: 0.94 µg/m³
  • O3: 0.050 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.

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

Pollutant Concentrations:

  • PM2.5: 0.58 µg/m³
  • PM10: 0.97 µg/m³
  • O3: 0.052 ppm
  • NO2: 1.3 ppb
  • SO2: 0.2 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 0.68 µg/m³
  • PM10: 1.1 µg/m³
  • O3: 0.054 ppm
  • NO2: 1.2 ppb
  • SO2: 0.2 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

3 PM
54 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 0.96 µg/m³
  • PM10: 1.4 µg/m³
  • O3: 0.055 ppm
  • NO2: 1.2 ppb
  • SO2: 0.2 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

4 PM
56 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.26 µg/m³
  • PM10: 1.75 µg/m³
  • O3: 0.056 ppm
  • NO2: 1.3 ppb
  • SO2: 0.2 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

5 PM
55 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.56 µg/m³
  • PM10: 2.09 µg/m³
  • O3: 0.056 ppm
  • NO2: 1.5 ppb
  • SO2: 0.3 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

6 PM
51 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 1.88 µg/m³
  • PM10: 2.49 µg/m³
  • O3: 0.054 ppm
  • NO2: 2.1 ppb
  • SO2: 0.3 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.23 µg/m³
  • PM10: 2.97 µg/m³
  • O3: 0.052 ppm
  • NO2: 3.1 ppb
  • SO2: 0.3 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.47 µg/m³
  • PM10: 3.36 µg/m³
  • O3: 0.050 ppm
  • NO2: 3.5 ppb
  • SO2: 0.4 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 2.71 µg/m³
  • PM10: 3.76 µg/m³
  • O3: 0.048 ppm
  • NO2: 3.7 ppb
  • SO2: 0.4 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.02 µg/m³
  • PM10: 4.26 µg/m³
  • O3: 0.046 ppm
  • NO2: 4 ppb
  • SO2: 0.4 ppb
  • CO: 0.17 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 3.44 µg/m³
  • PM10: 4.92 µg/m³
  • O3: 0.045 ppm
  • NO2: 4.3 ppb
  • SO2: 0.4 ppb
  • CO: 0.18 ppm

Health Recommendations:

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