Hourly Weather | Today Wednesday, March 18, 2026
Active Weather Warnings
Duluth, Minnesota
6 AM
Cloudy Weather
19°
Feels Like 16°
20
Frost Risk: 100%
Humidity: 84%
UV Index: 0
Wind: 6 mph
7 AM
Cloudy Weather
19°
Feels Like 16°
13
Frost Risk: 100%
Humidity: 85%
UV Index: 0
Wind: 6 mph
8 AM
Cloudy Weather
19°
Feels Like 10°
0
Frost Risk: 100%
Humidity: 88%
UV Index: 0
Wind: 9 mph
9 AM
Cloudy Weather
21°
Feels Like 12°
0
Frost Risk: 100%
Humidity: 85%
UV Index: 1
Wind: 10 mph
10 AM
Cloudy Weather
25°
Feels Like 16°
0
Humidity: 80%
UV Index: 1
Wind: 10 mph
11 AM
Cloudy Weather
28°
Feels Like 19°
0
Humidity: 75%
UV Index: 1
Wind: 10 mph
12 PM
Cloudy Weather
30°
Feels Like 25°
0
Humidity: 72%
UV Index: 2
Wind: 10 mph
1 PM
Cloudy Weather
34°
Feels Like 27°
3
Humidity: 70%
UV Index: 2
Wind: 10 mph
2 PM
Cloudy Weather
36°
Feels Like 30°
13
Humidity: 68%
UV Index: 2
Wind: 10 mph
3 PM
Cloudy Weather
39°
Feels Like 34°
13
Humidity: 67%
UV Index: 1
Wind: 9 mph
4 PM
Cloudy Weather
39°
Feels Like 36°
17
Humidity: 67%
UV Index: 1
Wind: 9 mph
5 PM
Partly Sunny with Showers
43°
Feels Like 34°
42
Humidity: 65%
UV Index: 1
Wind: 9 mph
6 PM
Cloudy Weather
41°
Feels Like 36°
38
Humidity: 70%
UV Index: 0
Wind: 8 mph
7 PM
Cloudy Weather
39°
Feels Like 34°
35
Humidity: 75%
UV Index: 0
Wind: 7 mph
8 PM
Cloudy Weather
39°
Feels Like 34°
34
Humidity: 78%
UV Index: 0
Wind: 7 mph
9 PM
Cloudy Weather
37°
Feels Like 32°
34
Humidity: 83%
UV Index: 0
Wind: 7 mph
10 PM
Cloudy Weather
36°
Feels Like 32°
40
Humidity: 87%
UV Index: 0
Wind: 7 mph
11 PM
Rainy Weather
36°
Feels Like 30°
52
Humidity: 88%
UV Index: 0
Wind: 6 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 3.72 µg/m³
  • PM10: 4.11 µg/m³
  • O3: 0.048 ppm
  • NO2: 2.1 ppb
  • SO2: 0.6 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.01 µg/m³
  • PM10: 4.49 µg/m³
  • O3: 0.046 ppm
  • NO2: 2.5 ppb
  • SO2: 0.6 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.37 µg/m³
  • PM10: 5.01 µg/m³
  • O3: 0.045 ppm
  • NO2: 3.2 ppb
  • SO2: 0.6 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 4.82 µg/m³
  • PM10: 5.7 µg/m³
  • O3: 0.044 ppm
  • NO2: 4.3 ppb
  • SO2: 0.7 ppb
  • CO: 0.16 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 5.54 µg/m³
  • PM10: 6.69 µg/m³
  • O3: 0.043 ppm
  • NO2: 4.6 ppb
  • SO2: 0.7 ppb
  • CO: 0.18 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 7.13 µg/m³
  • PM10: 8.57 µg/m³
  • O3: 0.044 ppm
  • NO2: 4.7 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
43 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 10.22 µg/m³
  • PM10: 11.87 µg/m³
  • O3: 0.045 ppm
  • NO2: 4.7 ppb
  • SO2: 0.9 ppb
  • CO: 0.20 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 15.44 µg/m³
  • PM10: 17.21 µg/m³
  • O3: 0.048 ppm
  • NO2: 4.6 ppb
  • SO2: 0.9 ppb
  • CO: 0.21 ppm

Health Recommendations:

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

2 PM
72 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 22.53 µg/m³
  • PM10: 24.38 µg/m³
  • O3: 0.055 ppm
  • NO2: 4.6 ppb
  • SO2: 0.9 ppb
  • CO: 0.22 ppm

Health Recommendations:

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

3 PM
86 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 28.63 µg/m³
  • PM10: 30.57 µg/m³
  • O3: 0.061 ppm
  • NO2: 4.5 ppb
  • SO2: 0.9 ppb
  • CO: 0.22 ppm

Health Recommendations:

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

4 PM
94 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 32.55 µg/m³
  • PM10: 34.57 µg/m³
  • O3: 0.065 ppm
  • NO2: 4.7 ppb
  • SO2: 0.9 ppb
  • CO: 0.22 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 34.84 µg/m³
  • PM10: 36.98 µg/m³
  • O3: 0.066 ppm
  • NO2: 5.7 ppb
  • SO2: 0.8 ppb
  • CO: 0.23 ppm

Health Recommendations:

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

6 PM
101 AQI
Unhealthy air quality for sensitive groups Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 35.95 µg/m³
  • PM10: 38.19 µg/m³
  • O3: 0.063 ppm
  • NO2: 7.7 ppb
  • SO2: 0.7 ppb
  • CO: 0.24 ppm

Health Recommendations:

Members of sensitive groups may experience health effects. The general public is less likely to be affected.

7 PM
101 AQI
Unhealthy air quality for sensitive groups Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 35.78 µg/m³
  • PM10: 38.08 µg/m³
  • O3: 0.058 ppm
  • NO2: 10.2 ppb
  • SO2: 0.6 ppb
  • CO: 0.25 ppm

Health Recommendations:

Members of sensitive groups may experience health effects. The general public is less likely to be affected.

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

Pollutant Concentrations:

  • PM2.5: 34.29 µg/m³
  • PM10: 36.33 µg/m³
  • O3: 0.053 ppm
  • NO2: 11.2 ppb
  • SO2: 0.4 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.

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

Pollutant Concentrations:

  • PM2.5: 33.17 µg/m³
  • PM10: 34.99 µg/m³
  • O3: 0.047 ppm
  • NO2: 11.3 ppb
  • SO2: 0.3 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.

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

Pollutant Concentrations:

  • PM2.5: 32.71 µg/m³
  • PM10: 34.44 µg/m³
  • O3: 0.042 ppm
  • NO2: 11 ppb
  • SO2: 0.3 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
93 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 32.1 µg/m³
  • PM10: 33.73 µg/m³
  • O3: 0.039 ppm
  • NO2: 10.4 ppb
  • SO2: 0.3 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.

Weather Alerts and Warnings for Duluth

Moderate Expected Observed

Special Weather Statement

Special Weather Statement issued March 18 at 4:44AM CDT by NWS Duluth MN
Mar 18, 4:44 AM Mar 18, 9:00 AM
At 430 AM CDT...light to very light freezing drizzle was reported
over much of northeast Minnesota. Freezing drizzle is forecast to
move into northwest Wisconsin and the Arrowhead by 7 AM.

A thin glaze of ice is expected with the freezing drizzle. Ice
accumulation is expected to be greatest on lightly traveled roads
and on sidewalks which were cleared of snow last evening.

Use caution while walking or traveling this morning. Be prepared
for slippery stretches on roads and bridges.
Updated: Mar 18, 4:47 AM Source: NWS Alert