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 weather measurements are averages based on climate data gathered at Phoenix Sky Harbor International Airport, located near the city center.

Temperature Weather iconTemperature

68 °F January average high 20 °C
46 °F January average low 8 °C
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 degrees Fahrenheit (16 degrees Celsius) 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 has just a few nights in a decade when the temperature drops to freezing.

Rainy Weather iconRain

0.9 in total precipitation 22 mm
4 days of rain

Half the time, Phoenix receives 0.1 to 1.4 inches (3 to 35 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.


The weather data here are long-term averages provided by the US National Centers for Environmental Information (NCEI). Temperature and precipitation are 1991-2020 normals while humidity and thunderstorms are 1961-1990 normals.

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