Regional Arizona
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| Saguaro cactus and the Rincon Mountains |
This vast region includes the greater Phoenix area, Tucson and Yuma.
Most of the time, the 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 is 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 3- to 4-inches of rain per year.
Unfortunately, the Arizona climate has been in a drought for the past 11 years and the state has been getting less precipitation overall.
Winter
Compared to the rest of the United States, Arizona’s desert has a mild winter climate.
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| A surprise Arizona weather condition – snow blankets the desert in Saguaro National Park’s eastern unit outside of Tucson. Photo: iStockphoto |
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 can also get snow, although it usually doesn’t last very long after it’s fallen.
Spring
By March, temperatures rise to around the mid-70°Fs during the day.
Nighttime temperatures can still drop into the 40°Fs.
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 108°F. It can even get as hot as 114°F.
Arizona weather conditions start to see a change around the second week of July.
This is when the summer monsoons blow up from Mexico, causing afternoon thunderstorms.
These storms often drop the temperature from the low 100°Fs to the 50°Fs or 60°Fs in a matter of minutes.
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| Arizona weather conditions can change quickly – a thunderstorm clears over the Tucson Mountains |
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.
Visit our monsoon page for more monsoon facts and monsoon safety tips.
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. |
| Flagstaff is a popular summer destination for those escaping the hot Arizona weather conditions of the desert |
Mountain towns like Flagstaff, Pinetop, Show Low and Greer range in elevation from over 5,000 up to 7,000 feet.
These towns 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 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, it can be quite cold with temperatures ranging from 40°Fs down to 20°Fs.
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.
Arizona Weather Conditions: Canyon Country
Sedona, Prescott, Payson, parts of the Grand Canyon and parts of the Navajo Reservation are mid-climate areas. |
| Paula watches the summer sun set over the South Rim of the Grand Canyon |
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 50°Fs and overnight lows in the 20°Fs.
Days are generally sunny. Winter storms that blow in from the Pacific Ocean will bring snowstorms.
Definitely expect snow at the South Rim of the Grand Canyon and on the Navajo Nation.
Even Sedona, which is at 4,600 feet, gets dustings of snow in winter.
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 are generalizations. Diverse geography, microclimates 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. Safety really comes down to common sense and being aware of your abilities and limitations. Always inquire locally before traveling. Always be conservative when planning your trips and routes.
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