Phoenix weather in January
In January, Phoenix has an average high of 19 °C67 °F and an average low of 6 °C42 °F, with about 33 mm1.3 in of precipitation. It is the 11th warmest month of the year and ranks 2nd for precipitation.
How January compares with other months
Compared with December, January is about the same temperature. Compared with February, January is 1.5 °C2.6 °F cooler on average. Daylight lasts about 10.2 hours around the middle of the month. Average relative humidity is 46% and the average cloud amount 40%.
Is January a good time to visit Phoenix?
Yes — January is one of the most comfortable months to visit Phoenix by our comfort score, which favours average highs of 21–28 °C, lows above 5 °C, little rain and moderate humidity.
What to wear in January
For Phoenix in January, pack light layers — T-shirts plus a light sweater or jacket and an extra layer for the cooler mornings and evenings.
January in nearby places
| Place | High °C°F | Low °C°F | Precip. mmin |
|---|---|---|---|
| Phoenix | 1967 | 642 | 331.3 |
| Peoria | 1966 | 542 | 241.0 |
| Mesa | 1966 | 541 | 331.3 |
| Tucson | 1865 | 439 | 241.0 |
| Yuma | 2068 | 643 | 120.5 |
| Nogales | 1661 | 236 | 240.9 |
| San Luis Río Colorado | 2068 | 642 | 120.5 |
| Mexicali | 2169 | 846 | 170.7 |
| Henderson | 1559 | 236 | 180.7 |
Nearby places that are more than 1 °C1.8 °F warmer in January: Mexicali; cooler: Tucson, Nogales and Henderson.
Other months in Phoenix
- January19 °C67 °F / 6 °C42 °F
- February21 °C70 °F / 7 °C44 °F
- March26 °C78 °F / 10 °C50 °F
- April30 °C86 °F / 13 °C56 °F
- May35 °C96 °F / 18 °C65 °F
- June42 °C107 °F / 24 °C76 °F
- July42 °C107 °F / 28 °C83 °F
- August41 °C105 °F / 27 °C81 °F
- September38 °C101 °F / 24 °C75 °F
- October32 °C90 °F / 17 °C63 °F
- November25 °C77 °F / 11 °C51 °F
- December19 °C66 °F / 5 °C42 °F
Frequently asked questions
How warm is Phoenix in January?
In January the average high in Phoenix is 19 °C (67 °F) and the average low is 6 °C (42 °F).
Does it rain a lot in Phoenix in January?
On average about 33 mm (1.3 in) of precipitation falls in January; it ranks 2nd of the 12 months.
Is January the warmest month in Phoenix?
No. The warmest month in Phoenix is July, with an average high of 42 °C (107 °F). The coldest month is December, with an average low of 5 °C (42 °F).
How long is the day in Phoenix in January?
In the middle of January the day in Phoenix lasts about 10.2 hours from sunrise to sunset. The value is calculated from the position of the city and the sun.
How humid is Phoenix in January?
The average relative humidity in January is about 46%. This is a long-term average for the whole day.
How cloudy is Phoenix in January?
On average about 40% of the sky is covered by cloud in January. This is the mean cloud amount from satellite data, not the number of sunny days.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.
The grid cell’s average elevation is 494 m, while Phoenix lies at about 331 m. Temperatures on this page were therefore adjusted by +1.1 °C1.9 °F using the standard lapse rate of 6.5 °C per 1,000 m.