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

October 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
October brings cloudy skies and wet weather in Portland with the advance of the fall season. The average temperatures in October drop to the range of 46°F (7.8°C) to 64°F (17.8°C) with a few chilly nights during the month.
The precipitation increases to 3" (76.2mm) with 13 wet days in October, along with an increase in humidity to a significant 78%. Sunny days are fewer as the sunshine reduces to a daily 5 hours with the increase in cloud cover.
By the third week of October, the fall foliage is at its peak, and the colorful landscape makes a fantastic view in the backdrop of the few mountains.

What is the temperature in October in Portland?

In Portland, in October, the average high-temperature is 63.9°F (17.7°C), and the average low-temperature is 46°F (7.8°C).

What is the average humidity in October in Portland?

The average relative humidity in October in Portland is 77.9%.

How much does it rain in Portland in October?

In Portland, in October, it is raining for 12.5 days, with typically 3" (76.2mm) of accumulated precipitation.

Does it snow in Portland in October?

In Portland, in October, it doesn't snow. In November, it regularly snows.

How many hours of daylight does Portland have in October?

In October, the average length of the day is 10.9h.

How many hours of sunshine does Portland have in October?

In October, the average sunshine in Portland is 4.9h.

How high is the UV index in October in Portland?

The average daily maximum UV index in October is 3. A UV Index reading of 3 to 5 represents a medium hazard to health from the exposure to the Sun's UV radiation.
Average temperature in October - Portland, OR
  • Average high temperature in October: 63.8°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 October: 46°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 October - Portland, OR
  • Average humidity in October: 77.9%

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 October - Portland, OR
  • Average rainfall in October: 3"

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 October - Portland, OR
  • Average rainfall days in October: 12.5 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 October - Portland, OR
  • Average snowfall in October: 0"

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 October - Portland, OR
  • Average snowfall days in October: 0 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 October / Average sunshine in October - Portland, OR
  • Average daylight in October: 10.9h

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 October: 4.9h

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 October - Portland, OR
  • Average UV index in October: 3

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).