Monthly weather forecast and climate
Phoenix, AZ

The city of Phoenix, Arizona at dusk
The city of Phoenix, Arizona at dusk
Phoenix, Arizona, has a hot desert climate classified under the Köppen climate classification as BWh, characterized by long and scorching summers and short, mildly warm winters. Its placement in the Sonoran Desert belt gives it two primary seasons: hot and hotter.

Phoenix receives plenty of sunshine in a year, scaling down to an average between ten and fourteen hours in summer and between eight and nine in winter. That means the sun shines practically throughout the day.
Temperatures in summer get incredibly high. At the peak of summer, the heat strikes 105.8°F (41°C) with the sun scorching all day long.
In winter, the temperature comes to as low as 39.2°F (4°C), but the impact may be felt minimally - the sun is up for up to eight hours a day.

Rainfall in Phoenix is scarce or minimal. The highest amount of precipitation collects at an average of 1.3" (33mm) calculated on an average of five rain days. In some days, rain does not fall at all, and when it rains the least, the rain gauge meter reads an average of 0.1" (2.5mm).
The annual humidity levels in Phoenix are relatively low, averaging at 36% annually. Generally, June and December are the most humid and least humid months across the year, respectively.
Arizona's weather is manageable between November and April. The biggest reason is the drop in temperature from the summer's extremes to between 39.2°F (4°C) and 51.8°F (11°C) when it is the coldest and between 66.2°F (19°C) and 84.2°F (29°C) at its hottest. During this time, outdoor activities are bearable, and there is minimal risk of extreme weather hazards.

Summer is the worst time to visit Phoenix. Between May and October, the summer is characterized by extremely high temperatures between 87.8°F (31°C) and 105.8°F (41°C) with July being at the peak. During this time, the sun shines for up to twelve hours a day and is accompanied by winds that are dusty and sandy.
The rain is so minimal that it does not help in cooling off some of the heat. The extreme temperatures become very harmful, especially for visitors who are new to its weather.

In Arizona, the number one health hazard is extreme heat. It is so hot that many people die from heat waves than any other weather-related accidents.
There are recorded very high cases of sunburns and skin conditions related to extreme heat, so it is advisable to use sunscreen, hats, and an umbrella for added protection and drink more water to avoid dehydration.

Dust storms are another weather hazard in Phoenix. The winds are unpredictable, and when they do occur, they are so intense they can sweep away stuff, including cars in motion. Dust storms also reduce visibility to as low as only a few feet ahead. To avoid accidents related to dust storms, it is advisable not to drive in the storm and just parking safely until the storms pass.

Wildfires are also experienced in Phoenix owing to its arid environment and quite high temperatures. Being in the desert belt, the fires can spread fast due to the winds that are always blowing.

In January, Phoenix is generally pleasant with manageable temperatures between 39.2°F (4°C) and 66.2°F (19°C). It may seem cold, but the sun shines for up to nine hours in the day. Weather in January »

The temperatures in February steady at an average between 42.8°F (6°C) and 69.8°F (21°C) prompting more tourists in the city. More outdoor activities are enjoyed at this time of the year. Weather in February »

Extended sunshine makes the temperatures even hotter ranging between 46.4°F (8°C) and 75.2°F (24°C). That creates a perfect time to visit the beaches. Weather in March »

April in Phoenix gets even hotter with temperatures rising to read between 51.8°F (11°C) and 84.2°F (29°C) accompanied by sunshine that will shine steadily for up to twelve hours across the day. Weather in April »

May in Phoenix is the official onset of summer. It is characterized by a rise in temperature to read an average between 60.8°F (16°C) and 93.2°F (34°C). It is also marked by an increase in the sunshine hours to approximately thirteen. Weather in May »

The temperatures read between 68°F (20°C) and 102.2°F (39°C), with an even higher subjective feeling of temperature experienced by the blazing sun shining for the entire day. Weather in June »

July is scorching in Phoenix, and its temperatures take a sharp rise to read between 77°F (25°C) and 105.8°F (41°C) prompting dangers that emanate from exposure to the heat of the sun. Weather in July »

Temperatures drop a little to read between 75.2°F (24°C) and 104°F (40°C) but are still extremely high and scorching, and caution should always be exercised. August is marked by the highest rainfall. Weather in August »

The sunshine hours drop to eleven getting a little cooler even from the temperatures that fall to a range between 69.8°F (21°C) and 98.6°F (37°C). These temperatures are still high and may be accompanied by dust and swirl winds. Weather in September »

October in Phoenix is the start of more pleasant weather. The temperatures are dropping to an average between 57.2°F (14°C) and 87.8°F (31°C). Weather in October »

In November, there is a further drop in temperatures to bring pleasantly warm weather that is chilly in the early mornings but a lot warmer in the day. Humidity rises sharply to 32%. Weather in November »

December is pleasant and inviting with its festivities that are made possible by the warm temperatures ranging between 39.2°F (4°C) and 66.2°F (19°C). Although these temperatures are almost high as the highest temperatures some U.S. cities reach during summer, this is the coldest Phoenix gets. Weather in December »

How many days does it rain in Phoenix?

Throughout the year, there are 36.6 rainfall days, and 8" (204mm) of precipitation is accumulated.

What is the driest month in Phoenix?

The month with the least rainfall is June when the rain falls for 0.5 days and typically collects 0" (0.5mm) of precipitation.

What is the warmest month in Phoenix?

The warmest month is July, with an average high-temperature of 106.2°F (41.2°C) and an average low-temperature of 83.5°F (28.6°C).

What is the rainiest month in Phoenix?

The month with the most rainfall in Phoenix is July when the rain falls for 4.2 days and typically aggregates up to 1.1" (26.7mm) of precipitation.

What is the coldest month in Phoenix?

With an average high-temperature of 66°F (18.9°C) and an average low-temperature of 44.8°F (7.1°C), December is the coldest month in Phoenix, Arizona.
Average temperature - Phoenix, AZ
Average humidity - Phoenix, AZ

The month with the highest relative humidity is December (51.8%).
The month with the lowest relative humidity is June (19.4%).

Average rainfall days - Phoenix, AZ

The month with the highest number of rainy days is August (5 days).
The month with the lowest number of rainy days is June (0.5 days).

Average daylight / Average sunshine - Phoenix, AZ