Summer in Portland really starts in July and ends in September. Summer temperatures average around 80 degrees but do go over a 100 for one or two days a year. Overnight temperatures average around 60 degrees. This is a 90 day period that typically has very little (and sometimes none) rain. The summer is really one of the best parts about Portland. It's warm for several months. There is modest humidity, often in the 50-60% range. We have comfortable nights to enjoy all the parks and other outdoor recreation and restaurants. The evenings are long and darkness doesn't come until 10:00 PM in early July. The extensive landscape of forests, beaches, rivers, and bike paths become a draw for all to enjoy on long summer nights.
In Portland, fall usually starts in October with daytime temperatures dropping to the 60s and low 70s, with cooler nights at about 50-58 degrees. By late October this has dropped another 10 degrees. This temperature change signals the trees to start turning colors. The cooler the nights; the brighter the reds, yellows and oranges of the leaves. October is usually a very nice month with mild temperatures and sunny days.
Portland's winter weather starts in Mid-November and lasts until mid-March. Temperatures range from daytime highs in the 50s, to low 40s. It will get below freezing several times and often into the 20s for a day or two. It rains a lot during these four months, but the temperatures are not extreme like in other interior states of the country. Let's talk snow. Yes it does happen but not every winter. In the last 14 years we have had two really good snow storms (over New Year's 2004 and January 2017). More common would be a light covering of 1-2 inches that melts off by mid-morning. Portland schools always close at the hint of snow, giving everyone else a good excuse to sleep in as well. We do get icy roads 4-5 times a winter which are actually more difficult for driving than snow. February usually has one warm spell where it gets over 60 degrees just to remind us that spring will come. We always have daffodils in bloom before Easter. Official rain fall is 37 inches per year which means wet days at home and plenty of snow in the mountains (and only 1 hour away).
Spring brings a beautiful time of year because we have more flowers blooming in May than any other time of year. Temperatures rise from the 50s in March and April to the 60s in May. By June we have many 70+ degree days and can have hot weather in the 90s as early as June 1 but rare. Through spring the rain continues and becomes more showers than downpours. We also get a few weeks of unseasonably warm weather in the spring. When people ask me if it rains all the time, this is what I say: No it doesn't rain all the time in Portland, but it's more accurate to say the sun doesn't shine all the time. We have a lot of cloudy days that contain no rain (and no sun). We often have days that start out raining and end up with blue skies and sunshine. Rain in Portland is usually not a torrential downpour, but rather a steady flow of water that is enough to get you wet on the way to the car.
Give me a call or send an e-mail! I will do my best to answer all your questions.