Today | Weather | Tuesday, September 8, 2026
Active Weather Warnings

Weather in Tempe, Arizona

01:59 AM
Now
Cloudy Night
90° F
Feels Like 88°
Precipitation 0 %
Wind 6 mph
Humidity 29 %
Today
Cloudy Weather
Day 109°
Night 86°
Precipitation 0 %
Wind 6 mph
UV Index (0 - 11+) 8

Warning: High UV Index Today: 8

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.

Tempe Weather Forecast Updated

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

Day

104°

Night

81°

Wind

6 mph

Precipitation

0 %

Air Quality in Tempe

NOW
18 AQI
Good air quality Dominant pollutant: PM10

Pollutant Concentrations:

PM2.5 3.13 µg/m³
PM10 19.08 µg/m³
O3 0.019 ppm
NO2 0.4 ppb
SO2 0 ppb
CO 0.08 ppm
NH3 0.27 µg/m³
NO 0 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)
PM2.53.13 µg/m³
PM1019.08 µg/m³
O337.57 µg/m³
NO20.79 µg/m³
SO20.02 µg/m³
CO89.05 µg/m³
NH30.27 µg/m³
NO0 µg/m³

Weather Alerts and Warnings for Tempe

Severe Expected Likely

Extreme Heat Warning

Extreme Heat Warning issued September 8 at 1:09AM MST until September 10 at 8:00PM MST by NWS Phoenix AZ
Sep 8, 11:00 AM Sep 10, 9:00 PM
WHAT: Dangerously hot conditions. Afternoon temperatures 105 to
109 expected. Major Heat Risk.

WHERE: The Phoenix metropolitan area.

WHEN: From 10 AM this morning to 8 PM MST Thursday.

IMPACTS: Heat related illnesses increase significantly during
extreme heat events. Overexposure can cause heat cramps and heat
exhaustion to develop and, without intervention, can lead to heat
stroke.

ADDITIONAL DETAILS: In Maricopa County, call 2-1-1 to find a free
cooling center, transportation, water, and more.
https://www.maricopa.gov/heat
+ Read More
An Extreme Heat Warning means that a period of very hot temperatures, even by local standards, will occur. Actions should be taken to lessen the impact of the extreme heat. Take extra precautions if you work or spend time outside. When possible, reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear lightweight and loose-fitting clothing when possible and drink plenty of water. 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. Public cooling shelters are available in some areas. Consult county officials for more details.
Updated: Sep 8, 2:47 AM Source: NWS Alert