Phoenix Forecast

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Air Quality Hourly Forecast | Phoenix

Click on each day to view forecast.

Friday Forecast:


Ozone

49 AQI
Max 8-hr Avg: 53 ppb

PM10

41 AQI
24-hr Avg: 44 µg/m3

PM2.5

28 AQI
24-hr Avg: 6.6 µg/m3

Saturday Forecast:


Ozone

50 AQI
Max 8-hr Avg: 54 ppb

PM10

39 AQI
24-hr Avg: 42 µg/m3

PM2.5

30 AQI
24-hr Avg: 7.2 µg/m3

Sunday Forecast:


Ozone

45 AQI
Max 8-hr Avg: 49 ppb

PM10

31 AQI
24-hr Avg: 34 µg/m3

PM2.5

28 AQI
24-hr Avg: 6.7 µg/m3

Monday Forecast:


Ozone

49 AQI
Max 8-hr Avg: 53 ppb

PM10

38 AQI
24-hr Avg: 41 µg/m3

PM2.5

34 AQI
24-hr Avg: 8.2 µg/m3

Tuesday Forecast:


Ozone

54 AQI
Max 8-hr Avg: 56 ppb

PM10

45 AQI
24-hr Avg: 49 µg/m3

PM2.5

36 AQI
24-hr Avg: 8.6 µg/m3

Air Quality By Pollutant:

Pollutant
Friday
9/24/2021
Saturday
9/25/2021
Sunday
9/26/2021
Monday
9/27/2021
Tuesday
9/28/2021
O3
49
50
45
49
54
PM10
41
39
31
38
45
PM2.5
28
30
28
34
36
Pollutant
FRI
SAT
SUN
MON
TUE
O3
49
50
45
49
54
PM10
41
39
31
38
45
PM2.5
28
30
28
34
36
O3 = Ozone, PM10 = Particles ≤ 10 microns, PM2.5 = Particles ≤ 2.5 microns

Forecast Discussion:

It is already an active Friday weather-wise, with showers and thunderstorms forming across the area this morning (highest rainfall totals across the East Valley as of 7 am). These storms are being created by an interaction between several things. First, a disturbance is dropping southwest through the state, which broke off from the tail end of the trough we have been talking about this week. Second, another disturbance is lifting northeast through the eastern portion of the state, and created a bit of an outflow boundary that moved into the Valley. And last but certainly not least, moisture has been on a slow increase over the past couple of days, helping fuel the storms. Rain chances will dwindle later this morning into the afternoon.

The main feature to watch over the next several days will be the disturbance dropping southwest. This feature is forecast to form a cut-off low that will center itself southwest of Arizona later today into tomorrow. Late Saturday through Monday, the system will slowly move northeast back through Arizona, before quickly moving east Tuesday into Wednesday as another trough moves onshore across the West Coast of the United States.

Even though rain chances will be low later today, chances will increase once again late Saturday through the day on Sunday as the low moves back through the region. This weekend, we are expecting locations to see anywhere from 0.10-0.30 inches of rain.

Temperatures are also forecast to drop, with afternoon highs in the mid-90s today and tomorrow, before lowering into the upper 80s by Sunday into Monday!

As for air quality, with increased cloud cover and more active weather, forecasting ozone to lower back into the Good AQI category today through the weekend. PM-10 and PM-2.5 are also forecast to remain in the Good AQI category through the weekend into the first part of next week.

Have a great weekend and enjoy the cooler weather!

- M. Pace
ADEQ Meteorologist


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