Mesa, Arizona weather in December

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

Average high: 69°F
Average low: 48°F
Rainy days: ~5 per month
Total precipitation: 1.4 in
Warmest recorded: 84°F
Coldest recorded: 35°F

Expect December days in Mesa, Arizona to top out around 69°F and cool to about 48°F overnight, with roughly 5 days of measurable rain across the month. In recent years December has ranged from 35°F to 84°F.

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