Regional Arizona
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The sections below will give you an approximation of weather conditions in Arizona by the state's three major bio-regions: the deserts, then mountains and canyon country.
Note that the local weather for Arizona's many diverse micro-climates can be highly variable from year to year.
Arizona Weather Conditions: Desert Areas
Much of the western, central and southern portions of Arizona are located in the Sonoran Desert - an environment characterized by mild winters, hot summers, a mostly dry climate, and an incredible variety of plants and animals.
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| Summer monsoon clouds dot the southern horizon in Tucson Mountain Park, which is famous for its dense stands of saguaro cactus |
This vast region includes the greater Phoenix area, Tucson, and Yuma.
Most of the time, the Arizona weather conditions in the region are sunny with mild to hot temperatures.
However, the Sonoran Desert has a bi-seasonal rainfall pattern, meaning that rain usually occurs twice a year.
Some desert areas receive about 12 inches of rain annually, with half falling in winter and the rest during the summer monsoon thunderstorm season.
The drier portions of the Sonoran Desert on its western edge, such as Yuma, Quartzsite and Lake Havasu City, may get as little as 2- to 4-inches of rain per year.
Unfortunately, the Arizona climate has been in a drought for several years and the state has been getting less precipitation overall.
Winter
Compared to the rest of the United States, the Arizona desert has a mild winter climate.
Daytime desert temperatures are generally in the low to mid-60°Fs to high 50°Fs with overnight lows reaching into the 40°Fs or even the 30°Fs.
Parts of the area are subject to hard freezes, depending on the elevation, so pack warm clothes for winter desert travel
The Sonoran Desert, including Phoenix and Tucson, can also get snow, although it usually doesn't last very long after it's fallen.
Spring
By March, the weather for Arizona in the deserts will usually have warmed up nicely.
Temperatures rise to around the mid-70°Fs during the day. Nighttime temperatures can still drop into the 40°Fs though.
Be prepared to hold onto your hat. Late March, April and May in the desert can also be quite windy.
Summer
Desert summers are hot with daily temperatures in the low 100°Fs.
Nighttime temperatures are comfortable, dropping to the mid-80°s or even to the 70°Fs.
Overnight temperatures are generally cooler out in the desert than in the cities due to the heat island effect.
The Phoenix area and all of western Arizona are usually the hottest parts of the state. It is not uncommon for summer daytime temperatures to hover around 110°F - 114°F.
There have even been extreme temperatures of 118°F recorded.
Arizona weather conditions start to see a change around the second week of July.
This is when the summer monsoon thunderstorms blow up from Mexico, causing afternoon thunderstorms.
These storms can drop the temperature from the 100°Fs to the 70°Fs or 60°Fs, or even the 50°Fs, in a matter of minutes. Frequently, thunderclouds will build over the mountains but no rain will fall.
Days like these are not only very hot but as humid as the tropics too.
Temperatures can range anywhere from the 90°Fs to the 100°Fs depending on cloud cover and storm buildup.
Monsoon thunderstorms are generally short-lived and highly localized.
See our Arizona Monsoon Season page for more monsoon facts and safety tips.
Or visit our Arizona Dust Storm and Flash Floods pages to learn about two common Arizona weather hazards.
Autumn
Desert weather conditions in October and November are pleasant with temperatures in the 80°Fs.
Some years during Thanksgiving, we were still wearing shorts!
Overnight lows can range anywhere from the 60°Fs to 40°Fs.
In optimal years, desert winter rains will start sometime in late October or early November.
These storms generally do not last more than a day or two and do not usually have the dramatic thunder and lightning of summer storms.
Arizona Weather Conditions: Mountains
Much of the northern and eastern sections of Arizona, as well as the Sky Islands of southeastern Arizona, are mountainous or high elevation. |
| Arizona weather conditions do include snow as evidenced by this snowfall on the historic Flagstaff train station |
Mountain towns like Flagstaff, Pinetop, Show Low and Greer as well as the Grand Canyon North Rim range in elevation from over 5,000 up to over 8,000 feet.
Arizona's highest point, Humphreys Peak north of Flagstaff, is 12,643 feet.
These towns, and their surrounding forest and mountains, offer a cool respite in summer for heat-weary desert dwellers.
The mountainous areas can receive as much as 22 inches per year of rain and snowfall.
Winter
Winter brings snow and temperatures ranging in the 30°Fs - 40°Fs during the day and dropping into the teens at night.
Spring/Autumn
Spring and fall have milder daytime temperatures, generally in the 50°Fs and 60°Fs, and even the low 70°Fs.
At night, Arizona weather conditions in these areas can be quite cold with temperatures ranging from 40°Fs down to 20°Fs.
However, early or late season storms can drop the daytime and nighttime temperatures even lower.
Summer
Summer temperatures average in the 80°Fs to 90°Fs in these areas and can cool into the 50°Fs at night.
Summer thunderstorms are common in July and August.
It's important to remember that Arizona's mountain regions can have cold weather and even snow at any time of the year if a major cold front or storm moves in, so always pack a jacket or coat no matter what the season.
Arizona Weather Conditions: Canyon Country
Sedona, Prescott, Payson, parts of the Grand Canyon and parts of the Navajo Reservation tend to be mid-climate areas. |
| A cold storm from the Pacific dumped a large amount of snow on Sedona in late February 2011 |
Elevations around the 4,000 – 5,000 foot range will generally see milder temperatures than either the mountains or the deserts.
Winter
Arizona weather conditions in canyon country can be highly variable.
In winter, these areas usually have daytime highs in the 40°Fs - 50°Fs and overnight lows in the 20°Fs, although it can get much colder.
Days are generally sunny. Winter storms that blow in from the Pacific Ocean will bring snowstorms, sometime dumping large amounts of snow.
Definitely expect snow at the South Rim of the Grand Canyon and on the Navajo Nation when you travel to these areas in winter.
Even Sedona, which is at 4,600 feet, can get anywhere from dustings of snow to a major snowfall.
Spring/Autumn
Spring and fall are generally sunny but cool with temperatures ranging from the 60°Fs and 70°Fs to overnight lows in the 50°Fs and 40°Fs.
Summer
Summer temperatures are in the mid-90°Fs but can get into the low 100°s.
Overnight temperatures drop to the low 60°Fs to high 50°Fs and can feel very cold to those used to desert summer nights.
Canyon country receives summer monsoon thunderstorms like the rest of the state.
Temperatures during storms may drop to 10-20 degrees cooler than the normal daytime or nighttime temperature.
Note: These Arizona weather conditions are generalizations. Diverse geography, micro-climates and elevations create a variety of weather patterns, rainfall and temperatures across Arizona. Always be sure to check conditions locally before you travel.
Note to the Reader: This page is intended for informational purposes only. It is not a substitute for professional advice. This information is not meant to cover every possible scenario or outcome. Before you travel, do your homework. YOU are solely responsible for your personal safety. Road conditions, weather and your personal knowledge and abilities all vary considerably. We cannot assume responsibility for you or anyone else's safety that reads and uses this information. Always inquire locally before traveling. Always be conservative when planning your trips and routes.
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