Tempe averages 162.7 days a year above 90°F, with August the wettest month at 1.3 in of normal rain. The hottest day on record was 119°F on Jun 26, 1970; the coldest, 18°F on Jan 13, 2013. The single biggest 24-hour rain event recorded was 3.08 in on Sep 8, 2014.
Climate and Average Weather Year Round in Tempe
Year-round temperature
In Tempe, the warmest months are June through September, with average daily highs between 101°F and 106°F. The coldest stretch runs December through February, with highs between 69°F and 74°F and overnight lows reaching 38°F.
Rainfall through the year
Rainfall in Tempe averages 0.7 in per month over the long run. August is the wettest at 1.3 in, while June is the driest at 0.1 in.
Days at 90 °F or hotter
Tempe averages 162.7 days per year at 90 °F or hotter. The hottest year on record saw 187 such days (2001); the coolest just 29 (2026).
Precipitation this year
As of May 29, Tempe has received 0.3 in of precipitation this year — 91% below the long-term normal for this point in the year (3.5 in).