Hourly Weather | Today Friday, September 18, 2026
Active Weather Warnings
Nampa, Idaho
9 PM
Cloudy Night
66°
Feels Like 64°
1
Humidity: 47%
UV Index: 0
Wind: 7 mph
10 PM
Cloudy Night
64°
Feels Like 63°
1
Humidity: 52%
UV Index: 0
Wind: 7 mph
11 PM
Cloudy Night
63°
Feels Like 61°
1
Humidity: 62%
UV Index: 0
Wind: 7 mph

Hourly Air Quality Forecast - AQI (US EPA)

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

Pollutant Concentrations:

  • PM2.5: 1.28 µg/m³
  • PM10: 1.93 µg/m³
  • O3: 0.046 ppm
  • NO2: 0.3 ppb
  • SO2: 0 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.22 µg/m³
  • PM10: 1.93 µg/m³
  • O3: 0.044 ppm
  • NO2: 0.4 ppb
  • SO2: 0 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

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

Pollutant Concentrations:

  • PM2.5: 1.24 µg/m³
  • PM10: 2.01 µg/m³
  • O3: 0.042 ppm
  • NO2: 0.4 ppb
  • SO2: 0 ppb
  • CO: 0.09 ppm

Health Recommendations:

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

Weather Alerts and Warnings for Nampa

Severe Future Possible

Flash Flood Watch

Flash Flood Watch issued September 18 at 10:50AM MDT until September 19 at 12:00AM MDT by NWS Boise ID
Sep 18, 10:50 AM Sep 19, 12:00 AM
WHAT: Flash flooding and debris flows caused by excessive rainfall
are possible over the Wapiti, Crooked, Buckhorn burn scar areas.

WHERE: Portions of south central and southwest Idaho, including
the following areas, in south central Idaho, Western Magic Valley.
In southwest Idaho, Boise Mountains, Camas Prairie, Lower Treasure
Valley, Upper Treasure Valley and West Central Mountains.

WHEN: Through this evening.

IMPACTS: Heavy rainfall over the Wapiti, Crooked, Buckhorn burn
scar is expected up to and during the period of the watch.
Residents near the Wapiti, Crooked, Buckhorn burn scar should
prepare for potential debris flow. Be sure to stay up to date with
information from local authorities. Heavy rainfall could trigger
flash flooding or debris flows in and near recent wildfire burn
scars.

ADDITIONAL DETAILS:
- National Weather Service Meteorologists are forecasting heavy
rainfall over the burn scar, which may lead to flash flooding and
debris flows.
- Some locations that may experience flash flooding include...
Idaho City, Fairfield, Lowman, Horseshoe Bend, Pine, Prairie,
Atlanta, Anderson Dam, Corral, Centerville, Pioneerville, Garden
Valley, Banks, Gardena, Crouch, Placerville, Trinity Lakes, Rocky
Bar, Dutch Creek Guard Station and Featherville.
- https://www.weather.gov/safety/flood
+ Read More
You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued.
Updated: Sep 18, 8:40 PM Source: NWS Alert