Phoenix, Arizona weather in August

Averages from 2021–2025 (155 days of record).

Average high: 104°F
Average low: 83°F
Rainy days: ~5 per month
Total precipitation: 2.0 in
Warmest recorded: 116°F
Coldest recorded: 71°F

Expect August days in Phoenix, Arizona to top out around 104°F and cool to about 83°F overnight, with roughly 5 days of measurable rain across the month. In recent years August has ranged from 71°F to 116°F.

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Current Phoenix, Arizona forecast → · Historical data by Open-Meteo (ERA5).