January weather forecast
Phoenix, AZ

The city of Phoenix, Arizona at dusk
The city of Phoenix, Arizona at dusk

Weather in January

January, the same as December, is another enjoyable winter month in Phoenix, Arizona, with average temperature fluctuating between 64.2°F (17.9°C) and 47.5°F (8.6°C).

Temperature

In January, the average high-temperature is essentially the same as in December - a still comfortable 64.2°F (17.9°C). In Phoenix, in January, the average low-temperature is 47.5°F (8.6°C).

Humidity

In January, the average relative humidity in Phoenix is 42%.

Rainfall

In Phoenix, during January, the rain falls for 3 days and regularly aggregates up to 0.28" (7mm) of precipitation. Throughout the year, in Phoenix, there are 44.6 rainfall days, and 5.04" (128mm) of precipitation is accumulated.

Snowfall

January through August, October through December are months without snowfall.

Daylight

The average length of the day in Phoenix is 10.2h.

Sunshine

In January, the average sunshine is 7.1h.

UV index

In Phoenix, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from the exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 4 interpret into the following advice:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the average humidity in January in Phoenix?

In Phoenix, Arizona, the average relative humidity in January is 42%.

How much does it rain in Phoenix in January?

In Phoenix, Arizona, during January, the rain falls for 3 days and regularly aggregates up to 0.28" (7mm) of precipitation.

When it does not snow in Phoenix?

January through August, October through December are months without snowfall.

How many hours of daylight does Phoenix have in January?

In Phoenix, Arizona, the average length of the day in January is 10.2h.

How many hours of sunshine does Phoenix have in January?

The average sunshine in January in Phoenix is 7.1h.

What is the UV index intensity in January in Phoenix?

In January, the average daily maximum UV index in Phoenix, Arizona, is 4. A UV Index estimate of 3 to 5 represents a medium health risk from the exposure to the Sun's UV radiation.

Average temperature in January
Phoenix, AZ

Average temperature in January - Phoenix, AZ
  • Average high temperature in January: 17.9°C

The warmest month (with the highest average high temperature) is July (39.8°C).
The month with the lowest average high temperature is December (17.2°C).

  • Average low temperature in January: 8.6°C

The month with the highest average low temperature is August (29.3°C).
The coldest month (with the lowest average low temperature) is January (8.6°C).

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Average pressure in January
Phoenix, AZ

Average pressure in January - Phoenix, AZ
  • Average pressure in January: 1018.9mbar

The month with the highest atmospheric pressure is January (1018.9mbar).
The month with the lowest atmospheric pressure is June (1009.5mbar).

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Average wind speed in January
Phoenix, AZ

Average wind speed in January - Phoenix, AZ
  • Average wind speed in January: 7.3km/h

The windiest month (with the highest average wind speed) is April (10.3km/h).
The calmest month (with the lowest average wind speed) is December (7km/h).

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Average humidity in January
Phoenix, AZ

Average humidity in January - Phoenix, AZ
  • Average humidity in January: 42%

The month with the highest relative humidity is December (43%).
The month with the lowest relative humidity is June (16%).

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Average rainfall in January
Phoenix, AZ

Average rainfall in January - Phoenix, AZ
  • Average rainfall in January: 7mm

The wettest month (with the highest rainfall) is July (19mm).
The driest months (with the least rainfall) are May and June (2mm).

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Average rainfall days in January
Phoenix, AZ

Average rainfall days in January - Phoenix, AZ
  • Average rainfall days in January: 3 days

The month with the highest number of rainy days is July (7.8 days).
The month with the least rainy days is June (0.8 days).

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Average snowfall in January
Phoenix, AZ

Average snowfall in January - Phoenix, AZ
  • Average snowfall in January: 0mm

The month with the highest snowfall is September (1mm).
Months with the least snowfall are January, February, March, April, May, June, July, August, October, November and December (0mm).

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Average snowfall days in January
Phoenix, AZ

Average snowfall days in January - Phoenix, AZ
  • Average snowfall days in January: 0 days

The month with the highest number of snowfall days is September (0.1 days).
Months with the least snowfall days are January, February, March, April, May, June, July, August, October, November and December (0 days).

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Average daylight in January /
Average sunshine in January
Phoenix, AZ

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 the shortest days is December (Average daylight: 10h).

  • Average sunshine in January: 7.1h

The month with the most sunshine is June (Average sunshine: 12.1h).
The month with the least sunshine is December (Average sunshine: 6.8h).

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Average sunshine days in January
Phoenix, AZ

Average sunshine days in January - Phoenix, AZ
  • Average sunshine days in January: 27.3 days

The month with the most sunshine days is May (29.2 days).
The month with the least sunshine days is July (21.1 days).

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Average UV index in January
Phoenix, AZ

Average UV index in January - Phoenix, AZ
  • Average UV index in January: 4

Months with the highest UV index are May, June, July and August (UV index 8).
The month with the lowest UV index is December (UV index 3).

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Average cloud cover in January
Phoenix, AZ

Average cloud cover in January - Phoenix, AZ
  • Average cloud cover in January: 18

The month with the most cloud cover is December (Cloud cover 21).
The month with the least cloud cover is June (Cloud cover 5).

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Average visibility in January
Phoenix, AZ

Average visibility in January - Phoenix, AZ
  • Average visibility in January: 10km

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).

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