Phoenix weather in August
August is one of the least pleasant months in Phoenix: highs of 40°C (103°F) and about 33 mm (1.3 in) of rain on average. Nights average 26°C (79°F) and cloud cover 38% (NASA POWER, 2001–2025 averages). It is the 3rd wettest month of the year and the 3rd warmest. Compared with July, it is cooler and about as wet; September brings highs of 37°C (99°F) and 22 mm (0.9 in) of rain.
Is August a good time to visit Phoenix?
least pleasant month Weather score 52/100.
August is one of the least pleasant months for weather in Phoenix. For better conditions, consider Oct–May.
Does it rain a lot in Phoenix in August?
No, it is usually dry: about 33 mm (1.3 in) falls in an average August. It is the 3rd wettest month of the year.
How warm is Phoenix in August?
Days average 40°C (103°F) and nights 26°C (79°F).
Phoenix weather by month
| Month | High | Low | Rain | Cloud | Weather |
|---|---|---|---|---|---|
| January | 18°C (65°F) | 4°C (40°F) | 33 mm | 40% | best |
| February | 20°C (68°F) | 6°C (42°F) | 32 mm | 40% | best |
| March | 25°C (76°F) | 9°C (48°F) | 21 mm | 34% | best |
| April | 29°C (84°F) | 12°C (54°F) | 8 mm | 28% | best |
| May | 34°C (94°F) | 17°C (63°F) | 6 mm | 22% | best |
| June | 41°C (105°F) | 23°C (74°F) | 2 mm | 17% | least pleasant |
| July | 41°C (105°F) | 27°C (81°F) | 33 mm | 43% | least pleasant |
| August | 40°C (103°F) | 26°C (79°F) | 33 mm | 38% | least pleasant |
| September | 37°C (99°F) | 23°C (73°F) | 22 mm | 25% | fair |
| October | 31°C (88°F) | 16°C (61°F) | 14 mm | 24% | best |
| November | 24°C (75°F) | 10°C (49°F) | 19 mm | 32% | best |
| December | 18°C (64°F) | 4°C (40°F) | 31 mm | 41% | best |
Sources: 2001–2025 monthly averages from NASA POWER (MERRA-2 reanalysis). Page updated . How we rate months