Peak UV index by city
| City | Population | Peak UV | Exposure | UV 3+ hours |
|---|---|---|---|---|
| Phoenix | 1,665,481 | 4 | Moderate | 11 AM–3 PM |
| Tucson | 548,371 | 5 | Moderate | 10 AM–3 PM |
| Mesa | 513,656 | 4 | Moderate | 11 AM–3 PM |
| Gilbert | 287,285 | 5 | Moderate | 11 AM–3 PM |
| Chandler | 278,748 | 5 | Moderate | 11 AM–3 PM |
| Glendale | 260,572 | 4 | Moderate | 11 AM–3 PM |
| Scottsdale | 243,006 | 5 | Moderate | 11 AM–3 PM |
| Peoria | 200,881 | 4 | Moderate | 11 AM–3 PM |
| Tempe | 190,571 | 4 | Moderate | 11 AM–3 PM |
| Surprise | 175,304 | 5 | Moderate | 11 AM–3 PM |
| Buckeye | 125,445 | 5 | Moderate | 11 AM–3 PM |
| Goodyear | 125,359 | 5 | Moderate | 11 AM–3 PM |
| Yuma | 105,227 | 5 | Moderate | 11 AM–4 PM |
| Avondale | 100,983 | 5 | Moderate | 11 AM–3 PM |
| Queen Creek | 89,770 | 5 | Moderate | 11 AM–3 PM |
| Maricopa | 78,362 | 5 | Moderate | 11 AM–3 PM |
| Flagstaff | 77,260 | 5 | Moderate | 11 AM–3 PM |
| Casa Grande | 69,753 | 5 | Moderate | 11 AM–3 PM |
| Marana | 65,523 | 5 | Moderate | 10 AM–3 PM |
| Lake Havasu City | 59,358 | 4 | Moderate | 10 AM–2 PM |
| Prescott Valley | 52,423 | 5 | Moderate | 11 AM–3 PM |
| Prescott | 48,420 | 5 | Moderate | 11 AM–3 PM |
| Oro Valley | 48,085 | 5 | Moderate | 10 AM–3 PM |
| Apache Junction | 45,672 | 5 | Moderate | 11 AM–3 PM |
| Sierra Vista | 44,907 | 6 | High | 10 AM–3 PM |
| Bullhead City | 43,987 | 4 | Moderate | 10 AM–2 PM |
| San Luis | 42,030 | 5 | Moderate | 11 AM–4 PM |
| Sahuarita | 37,694 | 5 | Moderate | 10 AM–3 PM |
| Kingman | 35,829 | 4 | Moderate | 11 AM–3 PM |
| El Mirage | 35,820 | 4 | Moderate | 11 AM–3 PM |
| Florence | 25,222 | 5 | Moderate | 11 AM–3 PM |
UV 3+ hours show the window from the first forecast hour at 3 or above to the end of the last. The EPA recommends sun protection at UV 3 and above. Open a city for its current-hour forecast and hourly chart. Forecast sources and limitations.
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