Phoenix Forecast

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Air Quality Hourly Forecast | Phoenix

Click on each day to view forecast.

Tuesday Forecast:


Ozone

39 AQI
Max 8-hr Avg: 42 ppb

PM10

59 AQI
24-hr Avg: 72 µg/m3

PM2.5

48 AQI
24-hr Avg: 11.4 µg/m3

Wednesday Forecast:


Ozone

38 AQI
Max 8-hr Avg: 41 ppb

PM10

24 AQI
24-hr Avg: 26 µg/m3

PM2.5

36 AQI
24-hr Avg: 8.7 µg/m3

Thursday Forecast:


Ozone

38 AQI
Max 8-hr Avg: 41 ppb

PM10

23 AQI
24-hr Avg: 25 µg/m3

PM2.5

33 AQI
24-hr Avg: 7.9 µg/m3

Friday Forecast:


Ozone

40 AQI
Max 8-hr Avg: 43 ppb

PM10

25 AQI
24-hr Avg: 27 µg/m3

PM2.5

51 AQI
24-hr Avg: 12.2 µg/m3

Saturday Forecast:


Ozone

39 AQI
Max 8-hr Avg: 42 ppb

PM10

26 AQI
24-hr Avg: 28 µg/m3

PM2.5

35 AQI
24-hr Avg: 8.3 µg/m3

Air Quality By Pollutant:

Pollutant
Tuesday
1/19/2021
Wednesday
1/20/2021
Thursday
1/21/2021
Friday
1/22/2021
Saturday
1/23/2021
O3
39
38
38
40
39
PM10
59
24
23
25
26
PM2.5
48
36
33
51
35
Pollutant
TUE
WED
THU
FRI
SAT
O3
39
38
38
40
39
PM10
59
24
23
25
26
PM2.5
48
36
33
51
35
O3 = Ozone, PM10 = Particles ≤ 10 microns, PM2.5 = Particles ≤ 2.5 microns

Forecast Discussion:

Rain! The first measurable rain of 2021 was recorded at Phoenix Sky Harbor at around 6:17 am. A narrow band of mainly light rain continues lifting northward through the Valley this morning, with rain totals generally in the 0.01-0.08 inch range. Ahead of these showers, gusty S/SE winds did result in some blowing dust across the Valley this morning, but luckily the rain quickly followed, helping to wash out the dust.

These showers are courtesy of two storm systems drawing moisture up into the region from the south and providing a bit of lift to kick-off the rain. The first disturbance is located off the spur of Baja, with the second dropping southward out of Nevada and into southern California.

The second system will continue moving south today before coming to a rest tomorrow, just off the coast of Northern Baja. The position of this system will be ideal for letting moisture continue to move into the region from the south. Right now, expecting the majority of the moisture and rain chances to be centered over Western Arizona; however, with plenty of moisture in place, we can't rule out more showers developing later this afternoon into tomorrow across Phoenix. We are not forecasting much in the way of rain totals from this morning through Wednesday morning, with a few hundredths of an inch more possible.

The better chance of rain for Phoenix will be tomorrow evening into Thursday as the low begins to lift northeast through the southern portion of Arizona. This will bring the possibility of slightly heavier rain, with rain totals in the 0.10-0.25 inch range. Rain chances begin to dwindle late Thursday into Friday morning as the system races east; however, another storm system is forecast to drop down the West Coast and into Arizona late Friday into the weekend. This will once again renew rain/snow chances across the state. Still a bit too early to nail down rain totals, but another 0.10-0.25 inches may be possible.

Overall, a pretty active week weather-wise across Arizona, especially compared to the very dry conditions we have been experiencing lately.

As for air quality, PM-10 (dust) will be in the Moderate AQI category today due to the dust that already occurred this morning. Otherwise, ozone and PM-10 are forecast to be in the Good AQI category through the forecast period. PM-2.5 (smoke) is also forecast to be in the low Moderate to Good AQI category through the forecast period, with the highest concentrations possible Friday morning with the lightest winds.

Have a great Tuesday and enjoy the change in weather!

- M. Pace
ADEQ Meteorologist


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