Hourly Weather | Today Thursday, September 17, 2026
Active Weather Warnings
Dayton, Ohio
10 AM
Cloudy Weather
79°
Feels Like 88°
37
Humidity: 81%
UV Index: 3
Wind: 6 mph
11 AM
Cloudy Weather
82°
Feels Like 93°
47
Humidity: 73%
UV Index: 3
Wind: 6 mph
12 PM
Sunny with a Chance of Thunderstorms
84°
Feels Like 91°
51
Humidity: 69%
UV Index: 2
Wind: 7 mph
1 PM
Cloudy Weather
88°
Feels Like 97°
47
Humidity: 63%
UV Index: 3
Wind: 8 mph
2 PM
Cloudy Weather
88°
Feels Like 97°
34
Humidity: 61%
UV Index: 4
Wind: 9 mph
3 PM
Cloudy Weather
90°
Feels Like 99°
34
Humidity: 60%
UV Index: 3
Wind: 8 mph
4 PM
Cloudy Weather
90°
Feels Like 99°
40
Humidity: 57%
UV Index: 3
Wind: 7 mph
5 PM
Sunny with a Chance of Thunderstorms
88°
Feels Like 93°
67
Humidity: 67%
UV Index: 1
Wind: 6 mph
6 PM
Cloudy Weather
84°
Feels Like 91°
49
Humidity: 67%
UV Index: 1
Wind: 6 mph
7 PM
Sunny with a Chance of Thunderstorms
82°
Feels Like 88°
67
Humidity: 76%
UV Index: 0
Wind: 6 mph
8 PM
Cloudy Night
82°
Feels Like 88°
40
Humidity: 75%
UV Index: 0
Wind: 6 mph
9 PM
Cloudy Night
81°
Feels Like 86°
34
Humidity: 79%
UV Index: 0
Wind: 5 mph
10 PM
Cloudy Night
79°
Feels Like 84°
40
Humidity: 82%
UV Index: 0
Wind: 5 mph
11 PM
Stormy Weather
77°
Feels Like 79°
51
Humidity: 84%
UV Index: 0
Wind: 5 mph

Hourly Air Quality Forecast - AQI (US EPA)

10 AM
39 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 9.26 µg/m³
  • PM10: 10.36 µg/m³
  • O3: 0.023 ppm
  • NO2: 3.4 ppb
  • SO2: 0.7 ppb
  • CO: 0.14 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

11 AM
39 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 9.37 µg/m³
  • PM10: 10.57 µg/m³
  • O3: 0.029 ppm
  • NO2: 2.8 ppb
  • SO2: 1.1 ppb
  • CO: 0.14 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

12 PM
47 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 9.18 µg/m³
  • PM10: 10.21 µg/m³
  • O3: 0.051 ppm
  • NO2: 1.2 ppb
  • SO2: 2.1 ppb
  • CO: 0.12 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

1 PM
54 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 8.99 µg/m³
  • PM10: 9.83 µg/m³
  • O3: 0.055 ppm
  • NO2: 0.8 ppb
  • SO2: 1.5 ppb
  • CO: 0.12 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

2 PM
56 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 8.92 µg/m³
  • PM10: 9.67 µg/m³
  • O3: 0.056 ppm
  • NO2: 0.8 ppb
  • SO2: 1.3 ppb
  • CO: 0.11 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

3 PM
57 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 8.74 µg/m³
  • PM10: 9.41 µg/m³
  • O3: 0.056 ppm
  • NO2: 0.8 ppb
  • SO2: 1.1 ppb
  • CO: 0.11 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

4 PM
55 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 8.32 µg/m³
  • PM10: 8.93 µg/m³
  • O3: 0.056 ppm
  • NO2: 0.8 ppb
  • SO2: 0.9 ppb
  • CO: 0.11 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

5 PM
53 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 7.72 µg/m³
  • PM10: 8.27 µg/m³
  • O3: 0.055 ppm
  • NO2: 0.8 ppb
  • SO2: 0.9 ppb
  • CO: 0.11 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

6 PM
45 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 7.35 µg/m³
  • PM10: 7.86 µg/m³
  • O3: 0.048 ppm
  • NO2: 2 ppb
  • SO2: 0.8 ppb
  • CO: 0.12 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

7 PM
36 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 7.32 µg/m³
  • PM10: 7.86 µg/m³
  • O3: 0.039 ppm
  • NO2: 3.7 ppb
  • SO2: 0.8 ppb
  • CO: 0.13 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

8 PM
31 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 7.34 µg/m³
  • PM10: 7.95 µg/m³
  • O3: 0.033 ppm
  • NO2: 4.7 ppb
  • SO2: 0.6 ppb
  • CO: 0.14 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

9 PM
30 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 7.28 µg/m³
  • PM10: 7.99 µg/m³
  • O3: 0.029 ppm
  • NO2: 4.9 ppb
  • SO2: 0.5 ppb
  • CO: 0.14 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

10 PM
30 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 7.3 µg/m³
  • PM10: 8.1 µg/m³
  • O3: 0.025 ppm
  • NO2: 5.1 ppb
  • SO2: 0.4 ppb
  • CO: 0.15 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

11 PM
30 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 7.29 µg/m³
  • PM10: 8.15 µg/m³
  • O3: 0.021 ppm
  • NO2: 5.3 ppb
  • SO2: 0.3 ppb
  • CO: 0.15 ppm

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

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