Today | Weather | Thursday, September 17, 2026

Active Weather Warnings

Flood Watch

Weather in Dayton, Ohio

08:17 AM

Now

72° F

Feels Like 77°

Precipitation 40 %

Wind 5 mph

UV Index (0 - 11+) 1

Humidity 96 %

Today

Day 90°

Night 72°

Precipitation 87 %

Wind 6 mph

UV Index (0 - 11+) 3

Dayton Weather Forecast Updated

4 minutes ago

Last updated on September 17, 2026 at 8:12 AM

Weather Forecast History

Last Year's Weather on This Day (September 17, 2025)

Day

90°

Night

55°

Wind

4 mph

Precipitation

1 %

Air Quality in Dayton

NOW

40 AQI

Good air quality Dominant pollutant: PM_2.5

Pollutant Concentrations:

PM_2.5 9.49 µg/m³

PM₁₀ 10.43 µg/m³

O₃ 0.022 ppm

NO₂ 3.5 ppb

SO₂ 0.4 ppb

CO 0.14 ppm

NH₃ 1.51 µg/m³

NO 0.01 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 – 9.49 µg/m³

PM₁₀ – 10.43 µg/m³

O₃ – 43.13 µg/m³

NO₂ – 6.63 µg/m³

SO₂ – 1.04 µg/m³

CO – 158.06 µg/m³

NH₃ – 1.51 µg/m³

NO – 0.01 µg/m³

View Hourly Air Quality Forecast

Weather Alerts and Warnings for Dayton

Severe Future Possible

Flood Watch

Flood Watch issued September 16 at 10:49PM EDT until September 17 at 2:00PM EDT by NWS Wilmington OH

Sep 17, 12:00 AM → Sep 17, 2:00 PM

WHAT: Flash flooding caused by excessive rainfall continues to be
possible.

WHERE: Portions of east central Indiana, including the following
county, Wayne and Ohio, including the following counties, Auglaize,
Champaign, Clark, Darke, Delaware, Franklin, Greene, Hardin,
Licking, Logan, Madison, Mercer, Miami, Montgomery, Preble, Shelby
and Union.

WHEN: Through Thursday afternoon.

IMPACTS: Excessive runoff may result in flooding of rivers,
creeks, streams, and other low-lying and flood-prone locations.

ADDITIONAL DETAILS:
- Multiple rounds of rain are possible Thursday. The heavier bands
of rainfall may produce 2 to 4 inches with locally higher
amounts.

+ Read More

People in the watch area should keep an eye on the weather and be prepared for immediate action should heavy rains and flooding occur or a Flash Flood Warning be issued. Avoid low-lying areas and be careful when approaching highway dips and underpasses.

Updated: Sep 17, 2:19 AM Source: NWS Alert