Hourly Weather | Today Friday, September 18, 2026
Active Weather Warnings
Cincinnati, Ohio
10 AM
Cloudy Weather
77°
Feels Like 82°
37
Humidity: 83%
UV Index: 1
Wind: 6 mph
11 AM
Cloudy Weather
79°
Feels Like 84°
47
Humidity: 80%
UV Index: 2
Wind: 6 mph
12 PM
Sunny with a Chance of Thunderstorms
79°
Feels Like 82°
51
Humidity: 80%
UV Index: 2
Wind: 7 mph
1 PM
Cloudy Weather
81°
Feels Like 88°
47
Humidity: 74%
UV Index: 3
Wind: 7 mph
2 PM
Cloudy Weather
81°
Feels Like 86°
20
Humidity: 72%
UV Index: 2
Wind: 7 mph
3 PM
Cloudy Weather
82°
Feels Like 86°
20
Humidity: 69%
UV Index: 1
Wind: 8 mph
4 PM
Cloudy Weather
81°
Feels Like 84°
20
Humidity: 70%
UV Index: 1
Wind: 8 mph
5 PM
Cloudy Weather
81°
Feels Like 82°
20
Humidity: 70%
UV Index: 1
Wind: 8 mph
6 PM
Cloudy Weather
79°
Feels Like 81°
20
Humidity: 71%
UV Index: 0
Wind: 8 mph
7 PM
Cloudy Weather
79°
Feels Like 79°
15
Humidity: 72%
UV Index: 0
Wind: 7 mph
8 PM
Cloudy Night
75°
Feels Like 75°
6
Humidity: 77%
UV Index: 0
Wind: 6 mph
9 PM
Cloudy Night
73°
Feels Like 73°
6
Humidity: 81%
UV Index: 0
Wind: 6 mph
10 PM
Cloudy Night
72°
Feels Like 72°
6
Humidity: 82%
UV Index: 0
Wind: 6 mph
11 PM
Cloudy Night
72°
Feels Like 72°
6
Humidity: 82%
UV Index: 0
Wind: 6 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 9.87 µg/m³
  • PM10: 10.81 µg/m³
  • O3: 0.020 ppm
  • NO2: 3.1 ppb
  • SO2: 0.5 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 10.15 µg/m³
  • PM10: 11.08 µg/m³
  • O3: 0.025 ppm
  • NO2: 2.4 ppb
  • SO2: 0.5 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

12 PM
46 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 10.96 µg/m³
  • PM10: 11.83 µg/m³
  • O3: 0.044 ppm
  • NO2: 1.4 ppb
  • SO2: 1.2 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

1 PM
49 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 11.73 µg/m³
  • PM10: 12.5 µg/m³
  • O3: 0.052 ppm
  • NO2: 0.9 ppb
  • SO2: 1.3 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 11.9 µg/m³
  • PM10: 12.59 µg/m³
  • O3: 0.056 ppm
  • NO2: 0.7 ppb
  • SO2: 1.2 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 9.96 µg/m³
  • PM10: 10.54 µg/m³
  • O3: 0.056 ppm
  • NO2: 0.6 ppb
  • SO2: 0.9 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.

4 PM
49 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 8.35 µg/m³
  • PM10: 8.83 µg/m³
  • O3: 0.053 ppm
  • NO2: 0.6 ppb
  • SO2: 0.7 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

5 PM
46 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 7.26 µg/m³
  • PM10: 7.64 µg/m³
  • O3: 0.050 ppm
  • NO2: 0.8 ppb
  • SO2: 0.6 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.39 µg/m³
  • PM10: 6.69 µg/m³
  • O3: 0.046 ppm
  • NO2: 1.3 ppb
  • SO2: 0.5 ppb
  • CO: 0.12 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.07 µg/m³
  • PM10: 6.36 µg/m³
  • O3: 0.042 ppm
  • NO2: 1.9 ppb
  • SO2: 0.5 ppb
  • CO: 0.13 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 6.06 µg/m³
  • PM10: 6.39 µg/m³
  • O3: 0.038 ppm
  • NO2: 2.4 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
33 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 6.29 µg/m³
  • PM10: 6.71 µg/m³
  • O3: 0.036 ppm
  • NO2: 2.6 ppb
  • SO2: 0.6 ppb
  • CO: 0.14 ppm

Health Recommendations:

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

10 PM
32 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 6.62 µg/m³
  • PM10: 7.16 µg/m³
  • O3: 0.035 ppm
  • NO2: 2.6 ppb
  • SO2: 0.7 ppb
  • CO: 0.15 ppm

Health Recommendations:

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

11 PM
32 AQI
Good air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 6.8 µg/m³
  • PM10: 7.45 µg/m³
  • O3: 0.035 ppm
  • NO2: 2.6 ppb
  • SO2: 0.8 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 Cincinnati

Severe Future Possible

Flood Watch

Flood Watch issued September 18 at 6:41AM EDT until September 18 at 12:00PM EDT by NWS Wilmington OH
Sep 18, 6:41 AM Sep 18, 12:00 PM
WHAT: Flash flooding caused by excessive rainfall continues to be
possible.

WHERE: Portions of southeast Indiana, including the following
counties, Dearborn, Franklin, Ohio and Ripley, northern Kentucky,
including the following counties, Boone, Campbell and Kenton, and
Ohio, including the following counties, Adams, Brown, Butler,
Clermont, Clinton, Hamilton, Highland, Pike, Scioto and Warren.

WHEN: Until noon EDT today.

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

ADDITIONAL DETAILS:
- Showers and thunderstorms capable of producing heavy rainfall
will continue to move across the area this morning. If heavier
rainfall repeatedly moves over the same area, then localized
flooding may occur.
+ 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 18, 6:55 AM Source: NWS Alert