Tucson Forecast

Image of Downtown Tucson

Air Quality Hourly Forecast | Tucson

Click on each day to view forecast.

Friday Forecast:


Ozone

58 AQI
Max 8-hr Avg: 57 ppb

PM10

40 AQI
24-hr Avg: 43 µg/m3

Saturday Forecast:


Ozone

54 AQI
Max 8-hr Avg: 56 ppb

PM10

36 AQI
24-hr Avg: 39 µg/m3

Sunday Forecast:


Ozone

50 AQI
Max 8-hr Avg: 54 ppb

PM10

35 AQI
24-hr Avg: 38 µg/m3

Monday Forecast:


Ozone

58 AQI
Max 8-hr Avg: 57 ppb

PM10

38 AQI
24-hr Avg: 41 µg/m3

Tuesday Forecast:


Ozone

46 AQI
Max 8-hr Avg: 50 ppb

PM10

35 AQI
24-hr Avg: 38 µg/m3

Air Quality By Pollutant:

Pollutant
Friday
9/25/2020
Saturday
9/26/2020
Sunday
9/27/2020
Monday
9/28/2020
Tuesday
9/29/2020
O3
58
54
50
58
46
PM10
40
36
35
38
35
Pollutant
FRI
SAT
SUN
MON
TUE
O3
58
54
50
58
46
PM10
40
36
35
38
35
O3 = Ozone, PM10 = Particles ≤ 10 microns, PM2.5 = Particles ≤ 2.5 microns

Forecast Discussion:

It hasn't rained in Tucson in a while. The last time the city saw measurable rainfall was August 29th (0.11"). Unfortunately, no rain is on the horizon, despite the fact that we have six more days (counting today) of the monsoon season. This does not bode well considering that the latest U.S. Drought Monitor data (valid as of 9/22) has much of Arizona, including Tucson, under "Extreme Drought" conditions.

So why are we so dry and still hot--for this time of year? We can thank high pressure. And for this forecast period, high pressure will continue to be the general weather pattern over the Southwest. Therefore, weather conditions will continue to be sunny and warm, with above-normal high temperatures each day, today (Friday) through at least Tuesday.

Air quality-wise, ozone reached the low end of the Moderate Air Quality Index (AQI) category yesterday. This outcome is looking to be possible again today and Saturday as light winds look to last into the early afternoon both days. Then stronger winds on Sunday are expected to help limit ozone more and bring it into the Good AQI category. On Monday, light winds will be favorable for ozone accumulation, but stronger winds on Tuesday are forecast to decrease ozone again.

PM10 (dust) is forecast in the Good AQI category each day. But Tuesday's winds will have to be re-evaluated to see if they will be strong enough to result in any dust.

- M. Graves
ADEQ Meteorologist


What Flag Should I Fly?

Friday: Yellow
Saturday: Yellow

What is the Flag Program and how can my school/organization join? | Learn More >