Tucson
Arizona, USA
Long-term weather forecast
Long-term weather forecast

January weather forecast and climate
Tucson, AZ

Sunset in downtown Tucson, Arizona, with a skyline and a sentinel peak in the distance
Sunset in downtown Tucson, Arizona, with a skyline and a sentinel peak in the distance
January, the same as December, is another comfortable winter month in Tucson, Arizona, with average temperature ranging between min 39.7°F (4.3°C) and max 65.5°F (18.6°C).

Temperature

In Tucson, the average high-temperature is essentially the same as in December - a still enjoyable 65.5°F (18.6°C). In Tucson, the average low-temperature is 39.7°F (4.3°C).

Humidity

The average relative humidity in Tucson, Arizona, is 48.4%.

Rainfall

In Tucson, Arizona, in January, during 4.9 rainfall days, 0.9" (23.9mm) of precipitation is typically accumulated. Throughout the year, there are 52.9 rainfall days, and 11.6" (294.4mm) of precipitation is accumulated.

Snowfall

January, February and December are months with snowfall. The month with the most snowfall is January when snow falls for 0.2 days and typically aggregates up to 0.3" (7.6mm) of snow.

Daylight

The average length of the day in January is 10.3h.

Sunshine

In Tucson, Arizona, the average sunshine in January is 8.4h.

UV index

In Tucson, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from unsafe exposure to the UV radiation for ordinary individuals.
Note: In January, the average maximum UV index of 4 translate into the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.

What is the temperature in January in Tucson?

In January, the average high-temperature is 65.5°F (18.6°C), and the average low-temperature is 39.7°F (4.3°C).

What is the average humidity in January in Tucson?

In Tucson, Arizona, the average relative humidity in January is 48.4%.

How many days does it rain in January in Tucson?

In Tucson, during January, the rain falls for 4.9 days and regularly aggregates up to 0.9" (23.9mm) of precipitation.

How many days does it snow in January in Tucson?

In Tucson, in January, during 0.2 snowfall days, 0.3" (7.6mm) of snow is typically accumulated.

When does it snow the most in Tucson?

January is the month with the most snowfall. Snow falls for 0.2 days and accumulates 0.3" (7.6mm) of snow.

How many hours of daylight does Tucson have in January?

In January, the average length of the day in Tucson is 10.3h.

How long on average sun shines in January in Tucson?

The average sunshine in January in Tucson, Arizona, is 8.4h.

What is the UV index reading in January in Tucson?

The average daily maximum UV index in January in Tucson is 4. A UV Index reading of 3 to 5 represents a medium hazard to health from the exposure to the Sun's UV rays.
Average temperature in January - Tucson, AZ
  • Average high temperature in January: 65.5°F

The warmest month (with the highest average high temperature) is June (100.3°F).
The month with the lowest average high temperature is December (64.8°F).

  • Average low temperature in January: 39.8°F

The month with the highest average low temperature is July (74.4°F).
The coldest month (with the lowest average low temperature) is December (39.1°F).

Average humidity in January - Tucson, AZ
  • Average humidity in January: 48.4%

The month with the highest relative humidity is December (50%).
The month with the lowest relative humidity is June (21.1%).

Average rainfall in January - Tucson, AZ
  • Average rainfall in January: 0.9"

The wettest month (with the highest rainfall) is August (2.4").
Driest months (with the lowest rainfall) are May and June (0.2").

Average rainfall days in January - Tucson, AZ
  • Average rainfall days in January: 4.9 days

The month with the highest number of rainy days is July (9.8 days).
The month with the lowest number of rainy days is June (1.7 days).

Average snowfall in January - Tucson, AZ
  • Average snowfall in January: 0.3"

The month with the highest snowfall is January (0.3").
Months with the lowest snowfall are March, April, May, June, July, August, September, October and November (0").

Average snowfall days in January - Tucson, AZ
  • Average snowfall days in January: 0.2 days

Months with the highest number of snowfall days are January and February (0.2 days).
Months with the lowest number of snowfall days are March, April, May, June, July, August, September, October and November (0 days).

Average daylight in January / Average sunshine in January - Tucson, AZ
  • Average daylight in January: 10.3h

The month with the longest days is June (Average daylight: 14.2h).
The month with shortest days is December (Average daylight: 10.1h).

  • Average sunshine in January: 8.4h

The month with most sunshine is June (Average sunshine: 13.2h).
The month with least sunshine is December (Average sunshine: 7.9h).

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

Months with the highest UV index are May, June, July and August (UV index 11).
The month with the lowest UV index is December (UV index 3).