Tucson averages 149.7 days a year above 90°F, with July the wettest month at 2.21 in of normal rain. The hottest day on record was 117°F on Jun 26, 1990; the coldest, 16°F on Dec 24, 1974. The single biggest 24-hour rain event recorded was 2.96 in on Oct 1, 1983.
Climate and Average Weather Year Round in Tucson
Year-round temperature
In Tucson, the warmest months are June through September, with average daily highs between 95°F and 101°F. The coldest stretch runs December through February, with highs between 66°F and 69°F and overnight lows reaching 41°F.
Rainfall through the year
Rainfall in Tucson averages 0.9 in per month over the long run. July is the wettest at 2.2 in, while May is the driest at 0.2 in.
Days at 90 °F or hotter
Tucson averages 149.7 days per year at 90 °F or hotter. The hottest year on record saw 190 such days (2017); the coolest just 39 (2026).
Precipitation this year
As of May 28, Tucson has received 2.5 in of precipitation this year — 6% below the long-term normal for this point in the year (2.7 in).