Today | Weather | Friday, July 17, 2026
Active Weather Warnings

Weather in Dayton, Ohio

03:57 PM
Now
Stormy Weather
93° F
Feels Like 97°
Precipitation 76 %
Wind 6 mph
UV Index (0 - 11+) 2
Humidity 49 %
Today
Sunny with a Chance of Thunderstorms
Day 95°
Night 72°
Precipitation 96 %
Wind 5 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.

Dayton Weather Forecast Updated

20 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (July 17, 2025)
Sunny with a Chance of Thunderstorms

Day

84°

Night

70°

Wind

8 mph

UV Index

10

Precipitation

70 %

Air Quality in Dayton

NOW
47 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 10.23 µg/m³
PM10 10.59 µg/m³
O3 0.051 ppm
NO2 1.2 ppb
SO2 1 ppb
CO 0.12 ppm
NH3 0.14 µg/m³
NO 0.17 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 considered satisfactory, and air pollution poses little or no risk.

Show raw pollutant concentrations (µg/m³)
PM2.510.23 µg/m³
PM1010.59 µg/m³
O399.46 µg/m³
NO22.28 µg/m³
SO22.58 µg/m³
CO136.43 µg/m³
NH30.14 µg/m³
NO0.17 µg/m³

Weather Alerts and Warnings for Dayton

Air Quality Alert

Air Quality Alert issued July 17 at 12:43AM EDT by NWS Wilmington OH
Jul 17, 12:43 AM Jul 18, 12:00 AM
The Miami Valley Regional Planning Commission and the Regional Air
Pollution Control Agency have issued an Air Quality Alert for Clark,
Darke, Greene, Miami, Montgomery, Preble, and Shelby counties in the
Miami Valley Region, until midnight tonight.

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.

For additional actions and information, visit miamivalleyair.org or
call 937-223-6323

Additionally, the Ohio Environmental Protection Agency has issued a
statewide Air Quality Advisory for the entire state of Ohio as smoke
from Canadian wildfires continues to adversely impact air quality.

Pollutants across the state are expected to range from the
'Unhealthy For Sensitive Groups' category in the southwest part of
the state to the 'Unhealthy' category in the rest of the state.
Hourly concentrations at times may reach the 'Very Unhealthy' to
'Hazardous' categories.

It is recommended, when possible, to avoid strenuous outdoor
activities, especially those with heart disease and respiratory
conditions like asthma. Watch for symptoms including wheezing,
coughing, chest tightness, dizziness, or burning in the nose,
throat, and eyes.

For additional information, please visit the Ohio Environmental
Protection Agency's website at epa.ohio.gov.
Updated: Jul 17, 3:37 PM Source: NWS Alert