Phoenix Weather in January

January's weather in Phoenix, Arizona is mostly sunny with comfortable daytime temperatures and little rain.

This page gives detailed information on the typical January temperature, precipitation, sun, humidity, wind and storms for Phoenix.

The temperature and rainfall numbers here are historical averages based on climate data gathered in downtown Phoenix. The rest of the weather measurements are averages at the Phoenix Sky Harbor International Airport, located a few miles southeast of the city center.

Temperature Weather iconTemperature

69 °F January average high 20 °C
46 °F January average low 8 °C

In most years, Phoenix averages a daily maximum temperature for January that's between 66 and 72 degrees Fahrenheit (19 to 22 degrees Celsius). The minimum temperature usually falls between 44 and 48 °F (6 to 9 °C).

The days at Phoenix heat up gradually during January. By the end of the month, the temperature has climbed around 3 °F (1 °C) above what it was at the start.

13 days 70 °F max. or more (21 °C)
24 days 50 °F min. or less (10 °C)

Nearly every day in January warms to over 60 °F (16 °C) in Phoenix. The city averages 1 day in January when the thermometer reaches into the 80s °F (over 27 °C). Temperatures above 90 °F (32 °C) are not expected here this month.

At night, the thermometer dips to 40 °F (4 °C) or below on 5 days. January averages just one night a decade when the temperature drops to freezing.

Rainy Weather iconRain

1.0 in total precipitation 25 mm
4 days of rain

Half the time, Phoenix receives 0.2 to 1.0 inches (6 to 24 mm) of rainfall in January. One in four years has drier weather, while another one in four is wetter. None of the precipitation normally falls as snow.

Sunny Weather iconSun

78 % sunshine
14 days clear skies

The sun's rays reach the ground in Phoenix during 78 percent of daylight hours on average in January, for a total of 247 hours in the month. Typically on 14 days this month the sky is mainly clear, with at most 30 percent cloud cover.

Sunlight in January at Phoenix lasts for 10 hours and 13 minutes a day on average. The shortest day of the month is the 1st with 9 hours and 59 minutes of daylight. By the end of the month, the days have lengthened to 10:34 from sunrise to sunset. These durations can vary by a minute or two from year to year.

Humid Weather iconHumidity

51 % January average humidity

The relative humidity in Phoenix during January usually peaks at 67 percent in the morning then drops to 32 percent by late afternoon.

Local Time2 am5 am8 am11 am2 pm5 pm8 pm11 pm
Humidity % 62 66 67 45 33 32 46 56

Windy Weather iconWind

5.3 mph January wind speed average 8.5 kph

January is a less windy than most other months in Phoenix.

Stormy Weather iconStorms

1 day rainfall of 0.5 inches (13 mm) or more
1 day with thunderstorms in January

About once a decade, Phoenix receives an inch (25 mm) or more of rain in one day during January.

Phoenix averages one January thunderstorm every two years.


These weather data are long-term historical averages provided by the National Climatic Data Center of the United States. The temperature and precipitation numbers are 1981-2010 normals while the humidity and thunderstorm statistics are 1961-1990 normals.

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