Phoenix weather in August
August in Phoenix: sweltering, a little rain — not the time — 41°C afternoons.
#11 of 12 months in Phoenix · #865 of 897 destinations to visit in August · comfort 39/100 (tier F)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Phoenix in August
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Phoenix climate normals — August
| Daytime high | 41°C / 106°F | 🔥 sweltering |
|---|---|---|
| Nighttime low | 28°C / 83°F | |
| Rainfall | 31 mm / 1.2 in | 🌦 some rain |
| Rainy days | 5 days | |
| Humidity | 38% | 🌵 dry |
| Dew point | 16°C / 61°F | |
| Sunshine | 12 h/day | |
| Daylight | 13.4 h | |
| Wind | 16 km/h / 10 mph | |
| Air quality (US AQI) | 52 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Phoenix in August — FAQ
- Is August a good time to visit Phoenix?
- August in Phoenix: sweltering, a little rain — not the time — 41°C afternoons. It ranks #11 of 12 months for Phoenix on SeasonMap's comfort score (39/100).
- What is the weather like in Phoenix in August?
- In August, Phoenix averages a daily high of 41.1°C and a low of 28.4°C, with about 31.3 mm of rain over roughly 4.8 rainy days.
- What is the air quality in Phoenix in August?
- Phoenix has a mean US Air Quality Index of about 52 in August.