Phoenix Forecast

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Air Quality Hourly Forecast | Phoenix

Updated On: 1/22/2021 - 8:23 AM
Click on each day to view forecast.

Friday Forecast:


Ozone

38 AQI
Max 8-hr Avg: 41 ppb

PM10

31 AQI
24-hr Avg: 33 µg/m3

PM2.5

37 AQI
24-hr Avg: 8.9 µg/m3

Saturday Forecast:


Ozone

39 AQI
Max 8-hr Avg: 42 ppb

PM10

31 AQI
24-hr Avg: 34 µg/m3

PM2.5

45 AQI
24-hr Avg: 10.7 µg/m3

Sunday Forecast:


Ozone

37 AQI
Max 8-hr Avg: 40 ppb

PM10

24 AQI
24-hr Avg: 26 µg/m3

PM2.5

32 AQI
24-hr Avg: 7.7 µg/m3

Monday Forecast:


Ozone

35 AQI
Max 8-hr Avg: 38 ppb

PM10

24 AQI
24-hr Avg: 26 µg/m3

PM2.5

37 AQI
24-hr Avg: 8.8 µg/m3

Tuesday Forecast:


Ozone

36 AQI
Max 8-hr Avg: 39 ppb

PM10

22 AQI
24-hr Avg: 24 µg/m3

PM2.5

31 AQI
24-hr Avg: 7.5 µg/m3

Air Quality By Pollutant:

Pollutant
Friday
1/22/2021
Saturday
1/23/2021
Sunday
1/24/2021
Monday
1/25/2021
Tuesday
1/26/2021
O3
38
39
37
35
36
PM10
31
31
24
24
22
PM2.5
37
45
32
37
31
Pollutant
FRI
SAT
SUN
MON
TUE
O3
38
39
37
35
36
PM10
31
31
24
24
22
PM2.5
37
45
32
37
31
O3 = Ozone, PM10 = Particles ≤ 10 microns, PM2.5 = Particles ≤ 2.5 microns

Forecast Discussion:

This morning, water vapor satellite shows the storm systems that will impact the weather through the middle of next week. The first two are currently along the West Coast of the United States (one just off the coast of Northern California and another off the coast of Washington). The third one is over the Aleutian Islands.

So how will all of this come together? First, some isolated and light rain showers are moving through the Valley this morning, but they will quickly move toward the north-northeast later this morning, with only light rain totals expected. The first system noted above will brush by Arizona to the northwest this evening with little to no impact on Phoenix, but the second system behind it will sweep into Arizona tomorrow (Saturday) afternoon into Sunday. As the system moves through Arizona, the best chance of rain in Phoenix appears to be Saturday evening through the morning hours on Sunday. Forecast rain totals are in the 0.10-0.25 inch range, with higher totals likely in the foothills just north and east of the Valley.

As this system moves eastward, another colder and stronger system will drop down the West Coast and into Arizona Monday into Tuesday. The best chance of rain with this system looks to be Monday afternoon/evening and again Tuesday afternoon/evening. This storm will have the potential to drop much more rain, with rain totals in the Valley forecast to be around 0.25-0.50 inches, with again higher totals in the foothills north and east of the Valley.

These two systems will also usher in much colder air, with afternoon high temperatures in Phoenix dropping into the low to mid-50s Sunday through Tuesday. This will also mean a big drop in snow levels. While no snow is expected in Phoenix, with snow levels dropping to between 3,000 and 4,000 feet Monday into Tuesday, we could see plenty of snow on Four Peaks and the Superstitions, which always makes for a great view! Also, if you are planning any travel in the northern or eastern portion of the state this weekend into the middle of next week, use extreme caution as travel will be dangerous.

These systems will also bring breezy to windy weather to the Valley. This afternoon, forecasting southwest breezes of 10-15mph, and Monday afternoon, southwest winds of 15-25mph will be possible. Given the rain over the southwestern portion of the state the past couple of days and the rain forecast this weekend, not expecting these winds to produce much in the way of blowing dust.

Air quality is forecast to be in the Good AQI category through the weekend into the first part of next week due to the active weather pattern. With that said, winds are forecast to become lighter tonight into tomorrow morning, and with cooler temperatures, that will mean the possibility of increased fireplace use. As a result, expect to see slightly higher PM-2.5 concentrations tonight into tomorrow morning.

Have a great weekend and enjoy the change in weather!

- M. Pace
ADEQ Meteorologist

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