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Active Weather Warnings

Weather in Green Bay, Wisconsin

04:22 PM
Now
Stormy Weather
81° F
Feels Like 79°
Precipitation 69 %
Wind 16 mph
UV Index (0 - 11+) 2
Humidity 69 %
Today
Sunny with a Chance of Thunderstorms
Day 82°
Night 66°
Precipitation 100 %
Wind 13 mph
UV Index (0 - 11+) 9

Warning: High UV Index Today: 9

High risk of harm from unprotected sun exposure. Take precautions: wear a hat, sunglasses, and apply sunscreen regularly if you’ll be outdoors for extended periods.

Green Bay Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (July 20, 2025)
Cloudy Night

Day

79°

Night

57°

Wind

5 mph

Precipitation

2 %

Air Quality in Green Bay

NOW
64 AQI
Moderate air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 12.56 µg/m³
PM10 12.67 µg/m³
O3 0.058 ppm
NO2 0.7 ppb
SO2 0.4 ppb
CO 0.38 ppm
NH3 0.59 µg/m³
NO 0.12 µg/m³
PM2.5 – Fine particles <2.5μm
PM10 – Inhalable particles <10μm
O3 – Ozone
NO2 – Nitrogen dioxide
SO2 – Sulfur dioxide
CO – Carbon monoxide
NH3 – Ammonia
NO – Nitric oxide

Health Recommendations:

Air quality is acceptable; however, for some pollutants, there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.

Show raw pollutant concentrations (µg/m³)
PM2.512.56 µg/m³
PM1012.67 µg/m³
O3114.71 µg/m³
NO21.24 µg/m³
SO21.08 µg/m³
CO435.33 µg/m³
NH30.59 µg/m³
NO0.12 µg/m³

Weather Alerts and Warnings for Green Bay

Air Quality Alert

Air Quality Alert issued July 20 at 12:18PM CDT by NWS Green Bay WI
Jul 20, 12:18 PM Jul 20, 8:30 PM
The Wisconsin Department of Natural Resources has issued an Air
Quality Advisory for the following counties: Brown, Calumet, Kewaunee,
Manitowoc, Marinette, Menominee, Oconto, Outagamie, Shawano,
Waupaca, Waushara, Winnebago.

WHAT...The PM2.5 AQI is expected to reach the Unhealthy for
Sensitive Groups level.

WHERE...East central and northeast Wisconsin.

WHEN...Until 6 p.m.

Precautionary/Preparedness Actions:
Sensitive groups: Make outdoor activities shorter and less
intense. It is OK to be active outdoors but take more breaks.
Watch for symptoms such as coughing or shortness of breath.
People with asthma: Follow your asthma action plan and keep quick
relief medicine handy.
People with heart disease: Symptoms such as palpitations,
shortness of breath, or unusual fatigue may indicate a serious
problem. If you have any of these, contact your health care
provider.

Additional Details:
Smoke is clearing from NW to SE but it will take longer to clear
across the eastern half of the state. Continual clearing of the
smoke as well as storm activity should diminish advisory level
smoke by 6 p.m.

For more information on current air quality, please see:
https://airquality.wi.gov
Updated: Jul 20, 3:00 PM Source: NWS Alert