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

Weather in Indianapolis, Indiana

05:25 PM
Now
Cloudy Weather
86° F
Feels Like 90°
Precipitation 0 %
Wind 7 mph
UV Index (0 - 11+) 3
Humidity 49 %
Today
Cloudy Weather
Day 86°
Night 75°
Precipitation 25 %
Wind 6 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.

Indianapolis Weather Forecast Updated

48 minutes ago
Last updated on

Air Quality in Indianapolis

NOW
72 AQI
Moderate air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 15.1 µg/m³
PM10 15.44 µg/m³
O3 0.061 ppm
NO2 0.6 ppb
SO2 1.5 ppb
CO 0.19 ppm
NH3 0.02 µg/m³
NO 0.16 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)
PM2.515.1 µg/m³
PM1015.44 µg/m³
O3119.63 µg/m³
NO21.12 µg/m³
SO23.84 µg/m³
CO222.87 µg/m³
NH30.02 µg/m³
NO0.16 µg/m³

Weather Alerts and Warnings for Indianapolis

Air Quality Alert

Air Quality Alert issued July 20 at 11:01AM EDT by NWS Indianapolis IN
Jul 20, 11:01 AM Jul 21, 12:00 AM
The officials at the Office of Sustainability for the City of
Indianapolis have called for a Knozone Action Day, IN EFFECT UNTIL
MIDNIGHT EDT TONIGHT.

A Knozone Action day means that a combination of high temperatures,
light winds, and other factors are expected to produce conditions
where high levels of ozone emissions may exceed federally mandated
standards.

Fine particulate levels are expected to be in the Unhealthy for
Sensitive Groups range. Active children and adults, and people with
respiratory disease, such as asthma should limit prolonged outdoor
exposure.

Here are some recommended actions that the public can take:

* Walk, bike, carpool or use public transportation.
* Avoid using the drive-through and combine errands into one trip.
* Avoid refueling your vehicle or using gasoline-powered lawn
equipment until after 7pm.
* Turn off your engine when idling for more than 30 seconds.
* Conserve energy by turning off lights or setting the air
conditioner to 75 degrees or above.

For additional information, please visit the IDEM Smog page at:

http://www.in.gov/idem/airmonitoring/smogwatch/
Updated: Jul 20, 4:37 PM Source: NWS Alert