Today | Weather | Wednesday, September 16, 2026
Active Weather Warnings

Weather in Tempe, Arizona

02:19 AM
Now
Cloudy Night
84° F
Feels Like 84°
Precipitation 48 %
Wind 6 mph
Humidity 52 %
Today
Sunny with a Chance of Thunderstorms
Day 90°
Night 73°
Precipitation 98 %
Wind 7 mph
UV Index (0 - 11+) 4

Tempe Weather Forecast Updated

Last updated on
Weather Forecast History
Last Year's Weather on This Day (September 16, 2025)
Cloudy Night

Day

102°

Night

81°

Wind

6 mph

Precipitation

2 %

Air Quality in Tempe

NOW
24 AQI
Good air quality Dominant pollutant: O3

Pollutant Concentrations:

PM2.5 2.29 µg/m³
PM10 12.77 µg/m³
O3 0.026 ppm
NO2 0.2 ppb
SO2 0 ppb
CO 0.10 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)
PM2.52.29 µg/m³
PM1012.77 µg/m³
O351.59 µg/m³
NO20.31 µg/m³
SO20.04 µg/m³
CO111.26 µg/m³
NH30.27 µg/m³
NO0 µg/m³

Weather Alerts and Warnings for Tempe

Severe Future Possible

Flood Watch

Flood Watch issued September 16 at 12:45AM MST until September 16 at 11:00PM MST by NWS Phoenix AZ
Sep 16, 1:45 AM Sep 17, 12:00 AM
WHAT: Flash flooding caused by excessive rainfall will be
possible.

WHERE: A portion of south central Arizona, including all of
Maricopa County, Northern and Western Pinal County, and Southern
Gila County.

WHEN: Through this evening.

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

ADDITIONAL DETAILS:
- The combination of abundant moisture and a weather system moving
into the region will support rounds of showers and thunderstorms
today through this evening. Moderate to heavy rainfall with
rainfall rates in excess of 1-2 inches per hour is expected with
most storms. Some areas will see training of storms leading to
high rainfall accumulations.
- http://www.weather.gov/safety/flood
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You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop.
Updated: Sep 16, 2:00 AM Source: NWS Alert