January weather forecast
Portland, OR

A colorful autumn view of the outline of Portland City, Oregon, USA
A colorful autumn view of the outline of Portland City, Oregon, USA

Weather in January

January, the same as December, in Portland, Oregon, is a frosty winter month, with an average temperature varying between 35.2°F (1.8°C) and 46.2°F (7.9°C).

Temperature

In January, the average high-temperature is relatively the same as in December - a still frosty 46.2°F (7.9°C). In January, in Portland, Oregon, the average low-temperature is 35.2°F (1.8°C).

Humidity

The months with the highest humidity are January, February and December, with an average relative humidity of 83%.

Rainfall

In Portland, Oregon, it is raining for 18.3 days, with typically 4.33" (110mm) of accumulated precipitation. In Portland, during the entire year, the rain falls for 173.1 days and collects up to 31.18" (792mm) of precipitation.

Snowfall

Months with snowfall are January through March, November and December. In Portland, during 1.3 snowfall days, 0.91" (23mm) of snow is typically accumulated. In Portland, during the entire year, snow falls for 6.4 days and aggregates up to 3.94" (100mm) of snow.

Daylight

In January, the average length of the day is 9h and 11min.
On the first day of January, sunrise is at 7:50 am and sunset at 4:38 pm. On the last day of the month, sunrise is at 7:32 am and sunset at 5:15 pm PST.

Sunshine

With an average of 4.1h of sunshine, January has the least sunshine of the year.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index reading of 2, and below, represents a minimal health hazard from exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 2 in January interpret into the following advice:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. 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. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What are the most humid months in Portland?

The months with the highest humidity in Portland are January, February and December, with an average relative humidity of 83%.

What is the average humidity in January in Portland?

In January, the average relative humidity is 83%.

How many days does it rain in January in Portland?

In Portland, Oregon, in January, it is raining for 18.3 days, with typically 4.33" (110mm) of accumulated precipitation.

How much does it snow in Portland in January?

In January, in Portland, Oregon, it is snowing for 1.3 days. Throughout January, 0.91" (23mm) of snow is accumulated.

How many hours of daylight does Portland have in January?

In January, the average day length in Portland, Oregon, is 9h and 11min.

When is the sunrise / sunset in January in Portland?

On the first day of January in Portland, sunrise is at 7:50 am and sunset at 4:38 pm. On the last day of the month, sunrise is at 7:32 am and sunset at 5:15 pm PST.

What is the month with the least sunshine in Portland?

The month with the least sunshine in Portland, Oregon, is January, with an average of 4.1h of sunshine.

How long on average sun shines in January in Portland?

The average sunshine duration in January in Portland is 4.1h.

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

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2.

What is the UV index reading in January in Portland?

In January, the average daily maximum UV index in Portland, Oregon, is 2. A UV Index value of 2, and less, symbolizes a minimal hazard to health from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in January
Portland, OR

Average temperature in January - Portland, OR
  • Average high temperature in January: 46.2°F

The warmest month (with the highest average high temperature) is August (81.5°F).
The month with the lowest average high temperature is December (44.1°F).

  • Average low temperature in January: 35.2°F

The month with the highest average low temperature is August (55°F).
The coldest month (with the lowest average low temperature) is December (34.7°F).

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Average pressure in January
Portland, OR

Average pressure in January - Portland, OR
  • Average pressure in January: 30.12"Hg

The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is August (30"Hg).

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Average wind speed in January
Portland, OR

Average wind speed in January - Portland, OR
  • Average wind speed in January: 5.8mph

The windiest month (with the highest average wind speed) is January (5.8mph).
The calmest month (with the lowest average wind speed) is August (3.9mph).

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Average humidity in January
Portland, OR

Average humidity in January - Portland, OR
  • Average humidity in January: 83%

The months with the highest relative humidity are January, February and December (83%).
The month with the lowest relative humidity is August (63%).

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Average rainfall in January
Portland, OR

Average rainfall in January - Portland, OR
  • Average rainfall in January: 4.33"

The wettest month (with the highest rainfall) is December (4.53").
The driest month (with the least rainfall) is July (0.31").

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Average rainfall days in January
Portland, OR

Average rainfall days in January - Portland, OR
  • Average rainfall days in January: 18.3 days

The month with the highest number of rainy days is March (20.4 days).
The month with the least rainy days is July (4.9 days).

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Average snowfall in January
Portland, OR

Average snowfall in January - Portland, OR
  • Average snowfall in January: 0.91"

The month with the highest snowfall is March (1.5").
The months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in January
Portland, OR

Average snowfall days in January - Portland, OR
  • Average snowfall days in January: 1.3 days

The month with the highest number of snowfall days is February (2.3 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in January /
Average sunshine in January
Portland, OR

Average daylight in January / Average sunshine in January - Portland, OR
  • Average daylight in January: 9h and 11min

The month with the longest days is June (Average daylight: 15h and 38min).
The month with the shortest days is December (Average daylight: 8h and 46min).

  • Average sunshine in January: 4h and 6min

The month with the most sunshine is August (Average sunshine: 10h and 54min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).

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Average sunshine days in January
Portland, OR

Average sunshine days in January - Portland, OR
  • Average sunshine days in January: 10.8 days

The months with the most sunshine days are July and August (23.8 days).
The month with the least sunshine days is March (8.3 days).

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Average UV index in January
Portland, OR

Average UV index in January - Portland, OR
  • Average UV index in January: 2

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in January
Portland, OR

Average cloud cover in January - Portland, OR
  • Average cloud cover in January: 57

The month with the most cloud cover is February (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 23).

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Average visibility in January
Portland, OR

Average visibility in January - Portland, OR
  • Average visibility in January: 5mi

The months with the highest visibility are July, August and September (6mi).
The months with the lowest visibility are January, February, March, April, May, June, October, November and December (5mi).

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