Mesa, Arizona weather in January

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

Average high

65°F

Average low

43°F

Rainy days

~5 per month

Total precipitation

1.5 in

Warmest recorded

78°F

Coldest recorded

31°F

Expect January days in Mesa, Arizona to top out around 65°F and cool to about 43°F overnight, with roughly 5 days of measurable rain across the month. In recent years January has ranged from 31°F to 78°F.