Last updated: June 24, 2025
In October, the average temperature in Portland, United States hovers around 6°C (44°F). Temperatures can vary significantly, with a minimum of -13°C (8°F) and a maximum of 28°C (83°F). Expect 79 mm (3.1 in) of precipitation spread over 9 days, contributing to an average humidity of 79%.
In October in Portland, the average temperature is 6°C (44°F), with maximums potentially reaching 28°C (83°F) and minimums dropping as low as -13°C (8°F). Pack accordingly to enjoy a wide range of weather conditions while exploring the area.
In Portland in October, the precipitation amount is 79 mm (3.1 in) spread over 9 days.
In Portland in October, humidity is 79%. With an average temperature of 6°C (44°F), this humidity feels like a cold, damp chill that seeps into your bones, making travel feel less comfortable and more challenging as the wet air clings to your clothes and skin.
In Portland in October, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Portland for better planning.
UV Risk Categories
Weather in Portland varies notably across the year, with each month offering distinct climate conditions. This page compares October’s weather to other months in Portland, focusing on differences in temperature, rainfall, humidity, and UV levels.
Temperature | Precipitation | Humidity | UV | |
---|---|---|---|---|
January Weather | -12°C (10°F) | 18 mm (0.7 inches) | 90% | low |
February Weather | -13°C (9°F) | 19 mm (0.8 inches) | 92% | moderate |
March Weather | -3°C (27°F) | 27 mm (1.1 inches) | 85% | moderate |
April Weather | 4°C (39°F) | 41 mm (1.6 inches) | 81% | high |
May Weather | 13°C (56°F) | 55 mm (2.2 inches) | 75% | very high |
June Weather | 20°C (69°F) | 91 mm (3.6 inches) | 79% | very high |
July Weather | 22°C (72°F) | 62 mm (2.4 inches) | 76% | very high |
August Weather | 20°C (68°F) | 81 mm (3.2 inches) | 78% | very high |
September Weather | 15°C (60°F) | 68 mm (2.7 inches) | 77% | high |
October Weather | 6°C (44°F) | 79 mm (3.1 inches) | 79% | moderate |
November Weather | -2°C (28°F) | 21 mm (0.8 inches) | 86% | moderate |
December Weather | -8°C (18°F) | 39 mm (1.5 inches) | 86% | low |