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October Weather in Portland, United States

Last updated: June 24, 2025

In October, the average temperature in Portland, United States hovers around 14°C (57°F). Expect a range of 0°C (33°F) as the minimum and a warm 32°C (90°F) at the high end. During this month, precipitation totals 141 mm (5.5 in) spread over 11 days, contributing to an average humidity of 79%.

October Temperature in Portland

In October in Portland, the average temperature is 14°C (57°F). The maximum can reach 32°C (90°F), and the minimum can be as low as 0°C (33°F). This varied climate makes Portland an exciting destination for travelers, offering both warm and chilly experiences.

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 14°C (57°F), with highs reaching up to 32°C (90°F) and lows dropping to around 0°C (33°F).
JanFebMarAprMayJunJulAugSepOctNovDec313439506069757367574235
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 total precipitation amount is 141 mm (5.5 in), which falls over the course of 11 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 141 mm (5.5 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec71102941101369212412510714190106
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 14°C (57°F), this humidity feels like a warm, sticky embrace that can make even short strolls feel exhausting, creating a sense of heaviness in the air that might dampen your adventurous spirit while exploring.

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.
JanFebMarAprMayJunJulAugSepOctNovDec87%85%85%83%75%74%65%62%66%79%87%85%
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 is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Portland, you can refer to this Hourly UV Index in Portland.

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 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098642
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-1°C (31°F)71 mm (2.8 inches)87%moderate
February Weather1°C (34°F)102 mm (4.0 inches)85%moderate
March Weather4°C (39°F)94 mm (3.7 inches)85%high
April Weather10°C (50°F)110 mm (4.3 inches)83%very high
May Weather16°C (61°F)135 mm (5.3 inches)75%very high
June Weather21°C (69°F)92 mm (3.6 inches)73%very high
July Weather24°C (75°F)124 mm (4.9 inches)65%very high
August Weather23°C (73°F)125 mm (4.9 inches)62%very high
September Weather19°C (67°F)107 mm (4.2 inches)66%very high
October Weather14°C (57°F)141 mm (5.5 inches)79%high
November Weather6°C (42°F)90 mm (3.5 inches)87%moderate
December Weather2°C (35°F)106 mm (4.2 inches)85%low

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