Arizona climate

World Climates covers 5 places in Arizona. By annual mean temperature, the warmest is Yuma (23 °C74 °F) and the coolest is Tucson (21 °C70 °F). The wettest is Tucson with 324 mm13 in of precipitation per year, the driest Yuma with 99 mm3.9 in.

The most common climate types (Köppen classification computed from these averages) are hot desert (BWh, 4 places) and hot semi-arid (BSh, 1 place).

The highest monthly average high is in Phoenix (42 °C107 °F in July); the lowest monthly average low is in Tucson (4 °C39 °F in December).

Across the places in Arizona, the months that most often rank as the most comfortable are February, March and November (5, 5 and 5 of 5 places respectively).

Temperature and rainfall across Arizona

Annual mean temperatures in Arizona range from 21 °C70 °F to 23 °C74 °F. The typical place (the median of all 5) has a year average of 23 °C74 °F. Annual precipitation ranges from 99 mm3.9 in to 324 mm13 in. The median place receives about 256 mm10 in in an average year.

In 0 places of 5, the coldest month has an average low below 0 °C (32 °F). In 5 places, the warmest month has an average high above 30 °C (86 °F). 2 places get less than 250 mm (10 in) of precipitation a year, which is very dry. None gets more than 2,000 mm (79 in) a year.

Averaged over all 5 places, July is the warmest month, with a mean of 34 °C93 °F. December is the coldest, with 12 °C53 °F. The wettest month on average is July (37 mm1.5 in). The driest is June (3 mm0.1 in). Single places can differ a lot from this average, so check the page of each city.

The table below lists the places sorted by population. The largest ones covered here are Phoenix, Tucson and Mesa. Each city page has a chart and a table for every month. It also shows the best time to visit and what to pack. The figures are 25-year averages for 2001–2025 from NASA POWER. They describe grid cells of roughly 50–70 km, not single weather stations.

Climate of each place in Arizona

Phoenix has a hot desert climate (Köppen BWh). Its year average is 23 °C74 °F. The warmest month is July, with an average high of 42 °C107 °F. The coldest is December, with an average low of 5 °C42 °F. About 256 mm10 in of precipitation falls in a year. August is the wettest month and June the driest. By our comfort score, the best months to visit are November–March.

Tucson has a hot semi-arid climate (Köppen BSh). Its year average is 21 °C70 °F. The warmest month is June, with an average high of 39 °C103 °F. The coldest is December, with an average low of 4 °C39 °F. About 324 mm13 in of precipitation falls in a year. July is the wettest month and May the driest. By our comfort score, the best months to visit are February–April and October and November.

Mesa has a hot desert climate (Köppen BWh). Its year average is 23 °C74 °F. The warmest month is July, with an average high of 42 °C107 °F. The coldest is December, with an average low of 5 °C41 °F. About 256 mm10 in of precipitation falls in a year. August is the wettest month and June the driest. By our comfort score, the best months to visit are November–April.

Peoria has a hot desert climate (Köppen BWh). Its year average is 23 °C74 °F. The warmest month is July, with an average high of 42 °C107 °F. The coldest is December, with an average low of 5 °C41 °F. About 193 mm7.6 in of precipitation falls in a year. August is the wettest month and June the driest. By our comfort score, the best months to visit are November–April.

Yuma has a hot desert climate (Köppen BWh). Its year average is 23 °C74 °F. The warmest month is July, with an average high of 42 °C107 °F. The coldest is December, with an average low of 6 °C43 °F. About 99 mm3.9 in of precipitation falls in a year. August is the wettest month and June the driest. By our comfort score, the best months to visit are November–March.

Frequently asked questions

Which is the warmest place in Arizona?

By annual mean temperature, the warmest place in Arizona is Yuma at 23 °C74 °F. The coolest is Tucson at 21 °C70 °F.

Where does it rain the most in Arizona?

Tucson gets the most precipitation, 324 mm13 in in an average year. The driest place is Yuma with 99 mm3.9 in.

How many places in Arizona does this site cover?

World Climates has climate data for 5 places in Arizona. Each one has a page with monthly averages for temperature, rainfall, humidity and daylight.

When is the best time to visit Arizona?

It depends on the place. Across Arizona, the months that most often rank as the most comfortable are February, March and November. Check the page of each city for its own best months.