Today | Weather | Friday, September 18, 2026
Active Weather Warnings

Weather in Cincinnati, Ohio

08:33 AM
Now
Cloudy Weather
75° F
Feels Like 81°
Precipitation 34 %
Wind 6 mph
UV Index (0 - 11+) 1
Humidity 87 %
Today
Sunny with a Chance of Thunderstorms
Day 82°
Night 64°
Precipitation 55 %
Wind 7 mph
UV Index (0 - 11+) 3

Cincinnati Weather Forecast Updated

8 minutes ago
Last updated on
Weather Forecast History
Last Year's Weather on This Day (September 18, 2025)
Night

Day

90°

Night

57°

Wind

2 mph

Precipitation

1 %

Air Quality in Cincinnati

NOW
41 AQI
Good air quality Dominant pollutant: PM2.5

Pollutant Concentrations:

PM2.5 9.86 µg/m³
PM10 10.8 µg/m³
O3 0.020 ppm
NO2 3.6 ppb
SO2 0.5 ppb
CO 0.15 ppm
NH3 1.85 µg/m³
NO 0.49 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)
PM2.59.86 µg/m³
PM1010.8 µg/m³
O338.46 µg/m³
NO26.71 µg/m³
SO21.31 µg/m³
CO174.78 µg/m³
NH31.85 µg/m³
NO0.49 µg/m³

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.
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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