Phoenix Forecast

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Air Quality Hourly Forecast | Phoenix

Click on each day to view forecast.

Friday Forecast:

Alert: Ozone High Pollution Advisory in effect for Friday

Ozone

108 AQI
Max 8-hr Avg: 73 ppb

PM10

55 AQI
24-hr Avg: 63 µg/m3

PM2.5

30 AQI
24-hr Avg: 7.2 µg/m3

Saturday Forecast:

Alert: Ozone High Pollution Advisory in effect for Saturday

Ozone

119 AQI
Max 8-hr Avg: 76 ppb

PM10

41 AQI
24-hr Avg: 44 µg/m3

PM2.5

31 AQI
24-hr Avg: 7.4 µg/m3

Sunday Forecast:

Alert: Ozone High Pollution Advisory in effect for Sunday

Ozone

112 AQI
Max 8-hr Avg: 74 ppb

PM10

41 AQI
24-hr Avg: 44 µg/m3

PM2.5

29 AQI
24-hr Avg: 7.0 µg/m3

Monday Forecast:

Alert: Ozone High Pollution Watch in effect for Monday

Ozone

115 AQI
Max 8-hr Avg: 75 ppb

PM10

56 AQI
24-hr Avg: 66 µg/m3

PM2.5

38 AQI
24-hr Avg: 9.1 µg/m3

Tuesday Forecast:

Alert: Ozone High Pollution Watch in effect for Tuesday

Ozone

112 AQI
Max 8-hr Avg: 74 ppb

PM10

60 AQI
24-hr Avg: 73 µg/m3

PM2.5

37 AQI
24-hr Avg: 8.8 µg/m3

Air Quality By Pollutant:

Pollutant
Friday
6/11/2021
Saturday
6/12/2021
Sunday
6/13/2021
Monday
6/14/2021
Tuesday
6/15/2021
O3
108
119
112
115
112
PM10
55
41
41
56
60
PM2.5
30
31
29
38
37
Pollutant
FRI
SAT
SUN
MON
TUE
O3
108
119
112
115
112
PM10
55
41
41
56
60
PM2.5
30
31
29
38
37
O3 = Ozone, PM10 = Particles ≤ 10 microns, PM2.5 = Particles ≤ 2.5 microns

Forecast Discussion:

The high temperature at Phoenix Sky Harbor yesterday (Thursday) was 101 degrees, and that will likely be the coolest high temperature the Valley experiences for a while. High pressure currently located just east/southeast of Arizona will slowly build and move WNW to be centered over the Four Corners by the first part of next week before very slowly moving slightly westward during the middle/end of next week.

This pattern will mean a non-zero chance of storms for the Valley (especially across the north and eastern foothills) Monday through at least the middle of next week. There will be enough moisture for storms to develop in the higher terrain across the northern and eastern portions of Arizona, and with the high near the Four Corners, these storms will attempt to make their way off the mountain and into the Valley. With that said, while moisture will increase across the Valley Monday through next week, it will still be relatively dry at the surface, so the main threat will be gusty outflows winds. We will raise PM-10 concentrations slightly Monday and Tuesday afternoon/evening to account for the chance of blowing dust.

Today through the weekend, this pattern shift will also result in mainly light winds and clear skies. With strong surface heating, we are expecting an increase in afternoon breezes later this weekend into the first part of next week, along with the possibility of outflows from the east/northeast on Monday and Tuesday afternoon/evening. These winds may result in ozone during the late afternoon/evening quickly dropping; however, with a rapid increase expected in the late morning into the early afternoon, we are still forecasting ozone to exceed the federal health standard today through Tuesday. As a result, an Ozone High Pollution Advisory is in effect for Phoenix today through Sunday, with an Ozone High Pollution Watch in effect for Monday and Tuesday.

Lastly, the National Weather Service has issued an Excessive Heat Warning for Phoenix Saturday through next Friday, as high temperatures are forecast to be in the 110-117 degree range.

Have a great weekend, and be sure to stay hydrated.

- M. Pace
ADEQ Meteorologist


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