The official sources I actually use to plan a day outside in Washington and Oregon: trail reports, avalanche forecasts, tides, permits, and the volcano that might be doing something. No listicles — these are the pages the rangers and forecasters themselves publish.
Trip reports from the last few days on nearly every trail in the state. The single most useful page for 'is the road open and is there snow at the trailhead'.
The avalanche forecast for the Cascades and Olympics, November through April. If you go above the trees in winter, this is the page you read first and the reason you sometimes stay home.
The actual tide tables, from the agency that computes them. Needed for beach walks, sea stacks, and anything involving razor clams.
The state posts approved dig dates a few weeks out, tied to low tides and marine toxin tests. Half of coastal Washington plans around this page. (I once tried to build an alert service on it; the page itself was the competitor.)
Lists on Bindle are hand-picked links with a note on each. Every link is archived, so it stays readable even after the original page is gone. More lists
Permits, closures, water reports, and the trail conditions feed for all 2,650 miles. Useful even for a weekend section.
Current alert levels for Rainier, St. Helens, Baker, Hood and the rest. Mostly 'normal', which is the reassuring thing to read before camping on one.
Rainforest, alpine, and Pacific coast in one park. The current conditions page is the one to bookmark: roads and campgrounds change with the weather.
Federal campground and permit reservations. The Enchantments lottery, Mount St. Helens climbing permits, and every national forest campsite you'll want on a summer weekend go through here.
Weather by elevation for named peaks, which is the forecast that matters when the valley says sun and the summit says 40 mph and sleet.