Today | Weather | Monday, July 20, 2026

Active Weather Warnings

Weather in Nampa, Idaho

03:54 PM

Now

100° F

Feels Like 102°

Precipitation 0 %

Wind 9 mph

UV Index (0 - 11+) 5

Humidity 15 %

Today

Day 102°

Night 73°

Precipitation 0 %

Wind 9 mph

UV Index (0 - 11+) 10

Warning: High UV Index Today: 10

High risk of harm from unprotected sun exposure. Take precautions: wear a hat, sunglasses, and apply sunscreen regularly if you’ll be outdoors for extended periods.

Nampa Weather Forecast Updated

25 minutes ago

Last updated on July 20, 2026 at 3:29 PM

Weather Forecast History

Last Year's Weather on This Day (July 20, 2025)

Day

88°

Night

64°

Wind

7 mph

Precipitation

2 %

Air Quality in Nampa

NOW

119 AQI

Unhealthy air quality for sensitive groups Dominant pollutant: O₃

Pollutant Concentrations:

PM_2.5 26.44 µg/m³

PM₁₀ 28.08 µg/m³

O₃ 0.076 ppm

NO₂ 0.5 ppb

SO₂ 0.1 ppb

CO 0.15 ppm

NH₃ 1.74 µg/m³

NO 0.1 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:

Members of sensitive groups may experience health effects. The general public is not likely to be affected.

Show raw pollutant concentrations (µg/m³)

PM_2.5 – 26.44 µg/m³

PM₁₀ – 28.08 µg/m³

O₃ – 148.36 µg/m³

NO₂ – 1.03 µg/m³

SO₂ – 0.33 µg/m³

CO – 175.98 µg/m³

NH₃ – 1.74 µg/m³

NO – 0.1 µg/m³

View Hourly Air Quality Forecast

Weather Alerts and Warnings for Nampa

Moderate Expected Likely

Heat Advisory

Heat Advisory issued July 20 at 2:12PM MDT until July 20 at 9:00PM MDT by NWS Boise ID

Jul 20, 2:12 PM → Jul 20, 9:00 PM

WHAT: Temperatures up to 102.

WHERE: Portions of southwest Idaho and southeast Oregon.

WHEN: Until 9 PM MDT /8 PM PDT/ this evening.

IMPACTS: Hot temperatures may cause heat illnesses, especially
for the young, elderly, and animals.

+ Read More

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1.

Updated: Jul 20, 3:29 PM Source: NWS Alert

Air Quality Alert

Air Quality Alert issued July 20 at 8:21AM MDT by NWS Boise ID

Jul 20, 8:21 AM → Jul 21, 8:30 AM

WHAT: Air Quality Advisory because of degraded air quality.

Air Quality Index is forecast to be Unhealthy.

WHERE: Ada, Canyon, Gem, Payette, and Washington Counties.

WHEN: UNTIL 3 PM MDT WEDNESDAY.

IMPACTS: Everyone may begin to experience health effects; members
of sensitive groups may experience more serious health effects.

+ Read More

Air pollutants can cause breathing difficulties for children, the elderly, as well as persons with respiratory problems. Those individuals who are sensitive to increased particulate matter or smoke are encouraged to avoid prolonged or strenuous outdoor activity during this advisory. Open burning is prohibited by air quality rule. It is also recommended that all other individuals limit prolonged or strenuous activity outdoors. THIS STATEMENT IS ISSUED BY THE IDAHO DEPARTMENT OF ENVIRONMENTAL QUALITY, AIR QUALITY GROUP FOR MORE INFORMATION, CONTACT DEQ's Boise Regional Office at (208) 373-0550

Updated: Jul 20, 3:29 PM Source: NWS Alert

Weather in Nampa, Idaho

Warning: High UV Index Today: 10

Nampa Weather Forecast Updated

Day

Night

Wind

Precipitation

Air Quality in Nampa

Pollutant Concentrations:

Health Recommendations:

Weather Alerts and Warnings for Nampa

Heat Advisory

Air Quality Alert

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