Today | Weather | Tuesday, June 30, 2026

Active Weather Warnings

Extreme Heat Warning

Weather in Appleton, Wisconsin

12:15 AM

Now

82° F

Feels Like 90°

Precipitation 33 %

Wind 9 mph

Humidity 79 %

Today

Day 97°

Night 77°

Precipitation 55 %

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

56 minutes ago

Last updated on June 29, 2026 at 11:18 PM

Air Quality in Appleton

NOW

31 AQI

Good air quality Dominant pollutant: PM_2.5

Pollutant Concentrations:

PM_2.5 7.55 µg/m³

PM₁₀ 9.85 µg/m³

O₃ 0.029 ppm

NO₂ 1.1 ppb

SO₂ 0.5 ppb

CO 0.11 ppm

NH₃ 1.18 µg/m³

NO 0 µg/m³

PM_2.5 – 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 considered satisfactory, and air pollution poses little or no risk.

Show raw pollutant concentrations (µg/m³)

PM_2.5 – 7.55 µg/m³

PM₁₀ – 9.85 µg/m³

O₃ – 57.57 µg/m³

NO₂ – 2.06 µg/m³

SO₂ – 1.35 µg/m³

CO – 121.47 µg/m³

NH₃ – 1.18 µg/m³

NO – 0 µg/m³

View Hourly Air Quality Forecast

Weather Alerts and Warnings for Appleton

Severe Expected Likely

Extreme Heat Warning

Extreme Heat Warning issued June 29 at 5:52PM CDT until June 30 at 7:00PM CDT by NWS Green Bay WI

Jun 29, 5:52 PM → Jun 30, 7:00 PM

WHAT: Dangerously hot conditions with heat index values up to 109
expected. Overnight heat indices will remain around 75 degrees,
which will still be hazardous for anyone without shelter after the
extreme heat in the afternoon.

WHERE: Marathon, Portage, Waushara, Wood, Calumet, Winnebago,
Brown, Outagamie, Shawano, and Waupaca Counties.

WHEN: Until 7 PM CDT Tuesday.

IMPACTS: Heat related illnesses increase significantly during
extreme heat and high humidity events.

+ Read More

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.

Updated: Jun 29, 11:18 PM Source: NWS Alert