Portland
Oregon, USA
Long-term weather forecast
Long-term weather forecast

January weather forecast and climate
Portland, OR

A colorful autumn view of the outline of Portland City, Oregon, with mountains in the distance
A colorful autumn view of the outline of Portland City, Oregon, with mountains in the distance
January is wet in Portland as the New Year month sees 4.9" (124.5mm) of heavy rainfall with mostly overcast skies. The sunshine lasts for a daily 3 hours during the period in which the sun breaks the cloud cover. January occasionally receives snow that registers hardly an inch with 1 or 2 days of snowfall.
The average temperatures are in the cold range of 36°F (2.2°C) to 46.9°F (8.3°C) with an occasional cold front pushing the temperatures below the freezing mark.
Portland has fewer visitors during New Year's holidays except for sports enthusiasts who take advantage of the city's proximity to Mount Hood.

What is the temperature in January in Portland?

In January, the average high-temperature is 46.9°F (8.3°C), and the average low-temperature is 35.8°F (2.1°C).

What is the average humidity in January in Portland?

The average relative humidity in January in Portland, Oregon, is 80.9%.

How many days does it rain in January in Portland?

In Portland, Oregon, in January, it is raining for 18 days, with typically 4.9" (124mm) of accumulated precipitation.

How many days does it snow in January in Portland?

In Portland, in January, snow falls for 0.7 days, with typically accumulated 0.5" (12.7mm) of snow.

How many hours of daylight does Portland have in January?

The average length of the day in January is 9.2h.

How many hours of sunshine does Portland have in January?

In Portland, the average sunshine in January is 2.8h.

What is the month with the lowest UV index in Portland?

January and December, with an average maximum UV index of 1, are months with the lowest UV index.

What is the UV index intensity in January in Portland?

In January, the average daily maximum UV index in Portland, Oregon, is 1. A UV Index value of 2, and less, symbolizes a low health risk from unsafe exposure to the Sun's UV rays.
Average temperature in January - Portland, OR
  • Average high temperature in January: 47°F

The warmest month (with the highest average high temperature) is August (81.1°F).
The month with the lowest average high temperature is December (45.6°F).

  • Average low temperature in January: 35.8°F

The month with the highest average low temperature is August (58°F).
The coldest month (with the lowest average low temperature) is December (35.2°F).

Average humidity in January - Portland, OR
  • Average humidity in January: 80.9%

The month with the highest relative humidity is December (82.7%).
The month with the lowest relative humidity is July (62.8%).

Average rainfall in January - Portland, OR
  • Average rainfall in January: 4.9"

The wettest month (with the highest rainfall) is November (5.6").
Driest months (with the lowest rainfall) are July and August (0.7").

Average rainfall days in January - Portland, OR
  • Average rainfall days in January: 18 days

The month with the highest number of rainy days is November (19 days).
The month with the lowest number of rainy days is August (3.9 days).

Average snowfall in January - Portland, OR
  • Average snowfall in January: 0.5"

The month with the highest snowfall is February (2.1").
Months with the lowest snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in January - Portland, OR
  • Average snowfall days in January: 0.7 days

Months with the highest number of snowfall days are February and December (1.5 days).
Months with the lowest number of snowfall days are April, May, June, July, August, September and October (0 days).

Average daylight in January / Average sunshine in January - Portland, OR
  • Average daylight in January: 9.2h

The month with the longest days is June (Average daylight: 15.6h).
The month with shortest days is December (Average daylight: 8.8h).

  • Average sunshine in January: 2.8h

The month with most sunshine is July (Average sunshine: 10.7h).
The month with least sunshine is December (Average sunshine: 2.1h).

Average UV index in January - Portland, OR
  • Average UV index in January: 1

The month with the highest UV index is July (UV index 8).
Months with the lowest UV index are January and December (UV index 1).