October Weather in Portland, United States

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%.

October Temperature in Portland

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.

October Weather in Portland: Daily Temperature Highs, Lows, and Averages

The chart illustrates October temperature patterns in Portland, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Portland, October typically has an average temperature of 6°C (44°F), with highs reaching up to 28°C (83°F) and lows dropping to around -13°C (8°F).
JanFebMarAprMayJunJulAugSepOctNovDec10927395669726860442817
Data source: Temperature data for Portland generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

October Precipitation in Portland

In Portland in October, the precipitation amount is 79 mm (3.1 in) spread over 9 days.

October Precipitation Trends in Portland

The chart displays monthly precipitation patterns in Portland, with values for each month alongside October’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how October’s conditions compare to those of other months. In Portland, October typically receives around 79 mm (3.1 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec182027415591628168792139
Data source: Precipitation data for October generated using information from the Copernicus Climate Change Service.
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October Humidity in Portland

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.

October Average Humidity in Portland

This chart illustrates the average monthly humidity levels in Portland, with October’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In October, average humidity in Portland is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%92%85%81%75%79%77%78%77%79%86%86%
Data source: Humidity data for October generated using information from the Copernicus Climate Change Service.

October UV Index in Portland

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.

Maximum UV Index Levels in Portland for October

The chart shows the monthly maximum UV Index (UVI) for Portland in October, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In October, the maximum UV index in Portland typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec245789987432
Data source: Portland October UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How October Weather in Portland Compares to Other Months

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.

This table compares monthly weather conditions in Portland, showing how October’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
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 Weather4°C (39°F)41 mm (1.6 inches)81%high
May Weather13°C (56°F)55 mm (2.2 inches)75%very high
June Weather20°C (69°F)91 mm (3.6 inches)79%very high
July Weather22°C (72°F)62 mm (2.4 inches)76%very high
August Weather20°C (68°F)81 mm (3.2 inches)78%very high
September Weather15°C (60°F)68 mm (2.7 inches)77%high
October Weather6°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

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