January weather forecast and climate
Phoenix, AZ

The city of Phoenix, Arizona at dusk
The city of Phoenix, Arizona at dusk
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 warming it up even more. January has relatively low humidity reading 34% and is also relatively wet. The rain gauge collects 0.9" (22.9mm), and the rain may fall for an average of four days during the month. Expect the rain to be accompanied by lightning strikes and thunder as well.
Average temperature in January - Phoenix, AZ
  • Average high temperature in January: 19.6°C

The warmest month (with the highest average high temperature) is July (41.2°C).
The month with the lowest average high temperature is December (18.9°C).

  • Average low temperature in January: 7.6°C

The month with the highest average low temperature is July (28.6°C).
The coldest month (with the lowest average low temperature) is December (7.1°C).

Average humidity in January - Phoenix, AZ
  • Average humidity in January: 50.9%

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

Average rainfall in January - Phoenix, AZ
  • Average rainfall in January: 23.1mm

The wettest month (with the highest rainfall) is July (26.7mm).
The driest month (with the lowest rainfall) is June (0.5mm).

Average rainfall days in January - Phoenix, AZ
  • Average rainfall days in January: 4.1 days

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 in January / Average sunshine in January - Phoenix, AZ
  • Average daylight in January: 10.2h

The month with the longest days is June (Average daylight: 14.3h).
The month with shortest days is December (Average daylight: 10h).

  • Average sunshine in January: 8.3h

The month with most sunshine is June (Average sunshine: 13.6h).
The month with least sunshine is December (Average sunshine: 7.9h).

Average UV index in January - Phoenix, AZ
  • Average UV index in January: 3

The month with the highest UV index is July (UV index 11).
Months with the lowest UV index are January and December (UV index 3).

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