Tucson Average Rainfall by Month

This page shows the average precipitation (including snowfall) in each month of the year in Tucson, Arizona. It is based on NOAA data for the years 1991–2020.

Average temperature by month

What's the Rainiest Month in Tucson?

In Tucson, July has the greatest precipitation of any month. On average, Tucson gets 2.2 inches of precipitation in July.

July is also the month where rain is most common. 28.4% of days in July will have at least some rain.

What's the Driest Month in Tucson?

In Tucson, May has the least precipitation of any month. On average, Tucson gets 0.20 inches of precipitation in May.

May is also the month where rain is least common. Only 4.5% of days in May will have measurable rain.

Month	Precipitation	% Chance
January	0.84 in	13.4
February	0.84 in	14.2
March	0.56 in	10.1
April	0.24 in	5.3
May	0.20 in	4.5
June	0.23 in	5.4
July	2.21 in	28.4
August	1.98 in	27.4
September	1.31 in	14.8
October	0.67 in	9.4
November	0.55 in	8.4
December	0.96 in	14.1
Year	10.59 in	13.0

Weather Station Details

Years	Station	Coordinates
1947–2024	Tucson International Airport	location
1894–1946	Tucson WFO	location