Phoenix, Arizona weather in December

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

Average high: 68°F
Average low: 46°F
Rainy days: ~4 per month
Total precipitation: 1.4 in
Warmest recorded: 83°F
Coldest recorded: 32°F

Expect December days in Phoenix, Arizona to top out around 68°F and cool to about 46°F overnight, with roughly 4 days of measurable rain across the month. In recent years December has ranged from 32°F to 83°F.

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