Today | Weather | Monday, July 20, 2026
Active Weather Warnings

Weather in Appleton, Wisconsin

04:19 PM
Now
Cloudy Weather
82° F
Feels Like 84°
Precipitation 49 %
Wind 15 mph
UV Index (0 - 11+) 3
Humidity 64 %
Today
Sunny with a Chance of Thunderstorms
Day 84°
Night 68°
Precipitation 97 %
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.

Appleton Weather Forecast Updated

10 minutes ago
Last updated on

Air Quality in Appleton

NOW
51 AQI
Moderate air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 11.64 µg/m³
PM10 11.73 µg/m³
O3 0.054 ppm
NO2 0.6 ppb
SO2 0.4 ppb
CO 0.33 ppm
NH3 0.65 µg/m³
NO 0.14 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)
PM2.511.64 µg/m³
PM1011.73 µg/m³
O3106.37 µg/m³
NO21.1 µg/m³
SO20.99 µg/m³
CO372.81 µg/m³
NH30.65 µg/m³
NO0.14 µg/m³

Weather Alerts and Warnings for Appleton

Extreme Future Possible

Tornado Watch

Tornado Watch issued July 20 at 3:51PM CDT until July 20 at 11:00PM CDT by NWS Green Bay WI
Jul 20, 3:51 PM Jul 20, 11:00 PM
THE NATIONAL WEATHER SERVICE HAS ISSUED TORNADO WATCH 501 IN
EFFECT UNTIL 11 PM CDT THIS EVENING FOR THE FOLLOWING AREAS

IN WISCONSIN THIS WATCH INCLUDES 22 COUNTIES

IN CENTRAL WISCONSIN

MARATHON PORTAGE WAUSHARA
WOOD

IN EAST CENTRAL WISCONSIN

CALUMET MANITOWOC WINNEBAGO

IN NORTH CENTRAL WISCONSIN

LANGLADE LINCOLN ONEIDA
VILAS

IN NORTHEAST WISCONSIN

BROWN DOOR FLORENCE
FOREST KEWAUNEE MARINETTE
MENOMINEE OCONTO OUTAGAMIE
SHAWANO WAUPACA

THIS INCLUDES THE CITIES OF ALASKA, ANGELICA, ANTIGO, APPLETON,
ARBOR VITAE, ARGONNE, ARMSTRONG CREEK, ARNOTT, AURORA,
AURORAVILLE, BAKERVILLE, BLACKWELL, BLOOMVILLE, BORTH,
BOULDER JUNCTION, BROOKSIDE, BRYANT, CAVOUR, CLAY BANKS,
CLINTONVILLE, COMMONWEALTH, CONOVER, CRANDON, DARBOY, DEERBROOK,
DOERING, DUNBAR, DUNDAS, DUVALL, ELCHO, ENTERPRISE, GLEASON,
GOODMAN, GOODNOW, GREEN BAY, HARMONY, HARRISON, HILES, HOFA PARK,
INSTITUTE, JEFFRIS, KEMPSTER, KESHENA, KEWAUNEE, KING,
LAC DU FLAMBEAU, LAKE TOMAHAWK, LAONA, LIND CENTER,
LITTLE SUAMICO, MACKVILLE, MANITOWISH WATERS, MANITOWOC,
MARSHFIELD, MC NAUGHTON, MENASHA, MERRILL, NEENAH, NEOPIT, NEVA,
NEW LONDON, NIAGARA, NORMAN, NORTHERN LAKE WINNEBAGO, NORTHPORT,
OCONTO, OSHKOSH, PEMBINE, PENSAUKEE, PESHTIGO, PINE RIVER,
PLOVER, POINT BEACH STATE PARK, POLAR, PORTERFIELD,
POTAWATOMI STATE PARK, PRESQUE ISLE, RANKIN, RHINELANDER,
RIO CREEK, ROSTOK, RURAL, SHAWANO, SHOTO, SILVER LAKE, SOBIESKI,
SPREAD EAGLE, STARKS, STEVENS POINT, THORNTON, TWO RIVERS, VALMY,
WAUPACA, WAUSAU, WAUTOMA, WINCHESTER, WINNEBAGO,
WISCONSIN RAPIDS, WITTMAN FIELD, AND WOODBORO.
Updated: Jul 20, 4:09 PM Source: NWS Alert

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, 4:09 PM Source: NWS Alert