Shifting weather for the month of October


Get ready for a month of temperature swings ahead of a wet winter

PORTLAND, Ore. (KOIN) – Besides all the changes that are occurring in front of our eyes during the month of October (colorful leaves, earlier sunsets), the weather can have a significant swing, too.

Of course, a big cause for this is the meandering jet stream and the angle of the sun. Here is the deal: our average high temperature in October starts at 70 degrees and falls to the upper 50s by the time we reach Halloween. That’s a significant drop for just 31 days.

A large portion of the month we spend in the 60s, which you could say is the sweet spot for fall weather. With a modest amount of rain to contend with, many like to spend October outdoors doing colorful hikes and preparing for the wet winter.

The month of October typically snags about 3.00″ of rain at the airport. So far, this month (only seven days in), we’ve gathered .08″. Last year you may remember an average month, but it’s hard to forget the wet 2016 October month with totals pushing 8 inches! This year, the start of the month has been fairly dry, although a bit cool. More rain is on the way to start the week, but it won’t be all that much. Expecting showers to begin Monday evening, but at this time, very scattered and light. We may see .10″ around Portland, possibly more if we get a good thundershower and it’s also possible we stay dry.

This front is more of an arctic front that will bring in cold air and some mountain snow, but it won’t produce much rain for the valley.

These are the type of systems that the month of October will see until we begin to have consistent cool winter air move into the PNW that will bottleneck our afternoons from warming.

Until then, we still have the chance to see our temperatures jump into the upper 60s to 70s, because that is still normal for this time of the season. That being said, it’s always a good idea to plan your child’s Halloween costumes around chilly weather.

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