October weather forecastPortland, OR
October
Weather in October
October in Portland means the full arrival of the fall season. Rainfall starts increasing and takes a significant leap from September to reach 3.39" (86mm). However, the temperature remains pleasantly cool, and the presence of the Sun can still be felt. The changing colours of foliage come into full display. People enjoy the comfortable weather, admiring the spectacular show nature puts up before the inception of winter.Temperature
A subtle decrease in the average high-temperature marks October, falling from September's warm 74.1°F (23.4°C) to a refreshing 61.7°F (16.5°C). An average low-temperature of 45.5°F (7.5°C) is recorded in the month of October.Humidity
The average relative humidity in October is 75%.Rainfall
In Portland, in October, during 15.8 rainfall days, 3.39" (86mm) of precipitation is typically accumulated. In Portland, during the entire year, the rain falls for 173.1 days and collects up to 31.18" (792mm) of precipitation.Snowfall
In Portland, snow does not fall in April through October.Daylight
The average length of the day in October is 10h and 55min.On the first day of the month, sunrise is at 7:10 am and sunset at 6:50 pm. On the last day of October, sunrise is at 7:50 am and sunset at 5:58 pm PDT.
Sunshine
In October, the average sunshine is 5.5h.UV index
The average daily maximum UV index in October is 3. A UV Index estimate of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for average individuals.Note: A maximum high daily UV index of 3 during October translates into the following directions:
Make use of precautions - Shielding skin and eyes from injury is a requirement. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. Boost your sun resistance with garments that are densely woven yet spacious.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in October
Portland, OR
- Average high temperature in October: 61.7°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 October: 45.5°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).
Average pressure in October
Portland, OR
- Average pressure in October: 30.05"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is August (30"Hg).
Average wind speed in October
Portland, OR
- Average wind speed in October: 4.7mph
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).
Average humidity in October
Portland, OR
- Average humidity in October: 75%
The months with the highest relative humidity are January, February and December (83%).
The month with the lowest relative humidity is August (63%).
Average rainfall in October
Portland, OR
- Average rainfall in October: 3.39"
The wettest month (with the highest rainfall) is December (4.53").
The driest month (with the least rainfall) is July (0.31").
Average rainfall days in October
Portland, OR
- Average rainfall days in October: 15.8 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).
Average snowfall in October
Portland, OR
- Average snowfall in October: 0"
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").
Average snowfall days in October
Portland, OR
- Average snowfall days in October: 0 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).
Average daylight in October /
Average sunshine in October
Portland, OR
- Average daylight in October: 10h and 54min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in October: 5h and 30min
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).
Average sunshine days in October
Portland, OR
- Average sunshine days in October: 13.9 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).
Average UV index in October
Portland, OR
- Average UV index in October: 3
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).
Average cloud cover in October
Portland, OR
- Average cloud cover in October: 42
The month with the most cloud cover is February (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 23).
Average visibility in October
Portland, OR
- Average visibility in October: 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).
