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January Weather in Phoenix, United States

Last updated: June 24, 2025

In January, the average temperature in Phoenix, United States hovers around 3°C (38°F). Be prepared for a wide range of temperatures, with a minimum dipping as low as -14°C (7°F) and a maximum reaching up to 15°C (60°F). Expect precipitation of about 125 mm (4.9 in) spread across 13 days, and don’t forget to brace yourself for the high humidity of approximately 84%.

January Temperature in Phoenix

In January in Phoenix, the average temperature is 3°C (38°F). The maximum can reach 15°C (60°F) and the minimum can be as low as -14°C (7°F). Be prepared for a wide range of temperatures and pack accordingly for your trip!

January Weather in Phoenix: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Phoenix, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Phoenix, January typically has an average temperature of 3°C (38°F), with highs reaching up to 15°C (60°F) and lows dropping to around -14°C (7°F).
JanFebMarAprMayJunJulAugSepOctNovDec383742475462696961504237
Data source: Temperature data for Phoenix generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

January Precipitation in Phoenix

In Phoenix in January, the total precipitation amount is 125 mm (4.9 in), occurring over a span of 13 days.

January Precipitation Trends in Phoenix

The chart displays monthly precipitation patterns in Phoenix, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In Phoenix, January typically receives around 125 mm (4.9 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec12613611996673249445194106
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
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January Humidity in Phoenix

In Phoenix in January, humidity is 84%. With an average temperature of 3°C (38°F), this humidity feels like a damp chill that seeps into your bones, making traveling uncomfortable as the cold air clings to you and the moisture creates an oppressive heaviness in the atmosphere.

January Average Humidity in Phoenix

This chart illustrates the average monthly humidity levels in Phoenix, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in Phoenix is approximately 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%85%86%83%83%83%78%67%66%77%87%87%
Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Phoenix

In Phoenix in January, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Phoenix, you can check the information here.

Maximum UV Index Levels in Phoenix for January

The chart shows the monthly maximum UV Index (UVI) for Phoenix in January, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In January, the maximum UV index in Phoenix typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3478111110108642
Data source: Phoenix January UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How January Weather in Phoenix Compares to Other Months

Weather in Phoenix varies notably across the year, with each month offering distinct climate conditions. This page compares January’s weather to other months in Phoenix, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Phoenix, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (38°F)125 mm (4.9 inches)84%moderate
February Weather3°C (38°F)136 mm (5.4 inches)85%moderate
March Weather5°C (42°F)119 mm (4.7 inches)86%high
April Weather8°C (47°F)96 mm (3.8 inches)83%very high
May Weather12°C (54°F)67 mm (2.6 inches)83%extreme
June Weather17°C (62°F)32 mm (1.3 inches)83%extreme
July Weather21°C (70°F)4 mm (0.2 inches)78%very high
August Weather20°C (69°F)9 mm (0.4 inches)67%very high
September Weather16°C (61°F)44 mm (1.7 inches)66%very high
October Weather10°C (51°F)51 mm (2.0 inches)77%high
November Weather6°C (43°F)94 mm (3.7 inches)87%moderate
December Weather3°C (37°F)106 mm (4.2 inches)87%low

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