Weather in Portland in October

A good month. October is a solid month to be in Portland. Highs average 18.2 °C, lows 8.3 °C, and rain falls on 14 days — nothing in the month is working against you.

October ranks 6 of 12 in Portland: past the worst of the year but short of July, which is the month to book if the dates are open.

This is wet-season rain: 14 wet days and 5 genuinely heavy ones, which in this climate means concentrated downpours rather than all-day grey. The pattern is usually a clear morning and a loud afternoon, so front-load the day and stop fighting the 3pm hour. Nothing specialised needed — this is the month you pack for the trip rather than for the weather.

What the averages hide

Averages flatten a month, and this one hides a few things: it never really gets hot: not one day in an average October reaches 30 °C. Across the twenty years measured, the hottest October day reached 32.3 °C and the coldest night fell to -2.6 °C, and the wettest single day dropped 71 mm — roughly 52% of the month's rain in one day.

October is moderately variable: 19 mm in the driest year against 367 mm in the wettest, around an average of 137 mm. Roughly two Octobers in three land near that average, and the third does something else entirely.

Wind is light at 2.7 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 80%, high enough to notice on the warm days without dominating them.

How October sits in the year

The month is on the way down: 7.6 °C cooler than September, with November dropping another 6.6 °C. The first week and the last are not the same trip. Rain is the thing that moves: November brings 5 days more of it, so the earlier half of a flexible trip is the safer half.

Daylight in October

11 hours of daylight, losing 1.5 hours across the month. That is between Portland's extremes of 15.7 and 8.7 hours, so days are long enough not to constrain the plan.

An inland climate

With no coast nearby, the year swings a fair way — 27.7 °C between the warmest afternoons and the coldest nights, wider than any coastal city at this latitude would manage.

How busy it gets

Shoulder. The value months — prices ease off and you get the place closer to itself.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

October in Portland versus nearby

If Portland is one option among several, the nearby comparison is worth making. Eugene is close enough to be a coin toss — within a degree on temperature, 2 days less rain. Seattle is the weaker option in October — 2.7 °C cooler, 1 day more rain.

So: October is a compromise. July is 24 points better and is what Portland is actually like at its best — worth moving the trip for if that is possible, and worth adjusting expectations for if it is not.

Every month in Portland

See all twelve months in Portland, or where else to go in October.