Science of Summer Solstice: How It Changes Around Oregon, Washington, the Coast

Published 06/18/26 at 8:55 a.m.
By Oregon Coast Beach Connection Staff

(Manzanita, Oregon) – Meteorologists already consider it summer. That started on June 1, and they call it "meteorological summer." Pictured: Manzanita, from Oregon Coast Beach Connection.

Yet the rest of science says “not so fast.” There's a division here in thinking, although weather folk are well aware of the distinction, and really the label is more for the public's sake.

Science experts like Jim Todd, astronomer for Portland's OMSI, are quick to point out what the calendar really says about summer's advent, especially around here in Oregon, Washington and along the coastline.

“Believe it or not, astronomical summer officially begins with the summer solstice on Sunday, June 21,” Todd told Oregon Coast Beach Connection. “The June solstice is the moment when the Sun is directly above the Tropic of Cancer. This is the northernmost latitude it reaches during the year; after this point, the Sun begins its apparent journey south again.”

Blue hour at Lincoln City

A good example is Portland, which – like Lincoln City, Neskowin, Salem and other Oregon burghs – is around Latitude 45°N. Todd said partially because of that, summer's start in Portland on June 21 brings it some of the longest and brightest days of the year.

Portland’s summer opening day brings nearly 15 hours and 41 minutes of daylight, with sunrise at 5:21 a.m. and sunset at 9:03 p.m. The midday sun climbs to about 68 degrees above the southern horizon, its highest point of the year. From the June solstice to the September equinox, the region sees almost 93 days of summer.

“For comparison, the Winter Solstice in December brings just under 9 hours of daylight with the noon sun at its lowest point of 21 degrees,” he said.

The word “solstice” comes from the Latin sol (sun) and sistere (to stand still). On the June solstice, the sun reaches its northernmost point in the sky and appears to pause before beginning its gradual shift southward.

Farther north, the solstice brings an even more dramatic effect. It is the one day each year when every location inside the Arctic Circle experiences 24 hours of daylight. Thanks to atmospheric refraction, the midnight sun can be seen for several days on either side of the solstice from areas up to about 60 miles south of the Arctic Circle. The farther north you go, the more nights of continuous daylight you’ll find.

Refraction does a load of interesting things to Oregon coast sunsets – like the green flash or its cousin the novaya zemblya. When the Green Flash and Oregon Coast Whale Research Meet: Science Explanation - Researcher captures green flash; explanation of that and Novaya Zemlya

Sunset happens later on the Oregon coast and Washington coast than I-5 towns, like about seven minutes later between Warrenton and Portland. That difference lessens the farther south you go and places like Bandon vs. Medford.

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