Washington State in the Summer: A Guide to the Best Weather, Destinations, and Activities

Washington State is one of the most stunning places to visit in the summer. With its mild temperatures, long daylight hours, and diverse landscapes, it offers endless opportunities for outdoor adventures. Whether you’re hiking in the Cascade Mountains, exploring the San Juan Islands, or strolling through Seattle’s vibrant neighborhoods, summer is the perfect time to experience the beauty of the Pacific Northwest.

If you’re planning a trip, this guide covers Washington State’s summer weather, best places to visit, outdoor activities, and essential travel tips to make the most of your experience.

Washington State in the Summer Weather

Summer in Washington typically lasts from June 21 to September 22, with warm, dry days and cooler nights. The weather varies by region, with warmer temperatures in Eastern Washington and a milder, ocean-influenced climate in the west.

Western Washington (Seattle, Olympic Peninsula, San Juan Islands)
- June: 65–75°F (18–24°C), occasional rain
- July: 70–85°F (21–29°C), dry and sunny
- August: 70–90°F (21–32°C), warm with clear skies
Eastern Washington (Spokane, Yakima, Walla Walla)
- June: 75–85°F (24–29°C), dry
- July: 85–100°F (29–38°C), hot with little humidity
- August: 80–95°F (27–35°C), warm with occasional thunderstorms

Long summer days mean the sun sets as late as 9:30 PM, giving visitors more time to explore.

What to Do in Washington State in the Summer

Washington State offers a diverse mix of outdoor adventures, city life, and cultural experiences. Here are the top activities and destinations to check out.

1. Explore Mount Rainier National Park

Why Visit? Summer is the best time to see wildflower meadows, waterfalls, and glaciers.
Top Activities: Hiking the Skyline Trail, visiting Paradise & Sunrise viewpoints, and spotting wildlife like marmots and black bears.
Best Time to Visit: July to September for clear trails.

2. Discover the Olympic Peninsula

Why Visit? Home to rainforests, rugged coastline, and alpine peaks.
Top Spots: Hike through Hoh Rainforest, visit Hurricane Ridge, and relax on Ruby Beach.
Best Time to Visit: Mid-June to early September.

3. Experience Seattle’s Summer Vibes

Why Visit? Warm weather and long days make it ideal for sightseeing.
Top Attractions: Pike Place Market, Space Needle, and Chihuly Garden.
Summer Events: Seafair Festival, Bite of Seattle, and outdoor concerts.

4. Go Wine Tasting in Walla Walla

Why Visit? Eastern Washington’s warm climate produces award-winning wines.
Top Wineries: L’Ecole No. 41, Seven Hills Winery, and Woodward Canyon.
Best Time to Visit: July and August for outdoor tastings.

5. Take a Scenic Drive on North Cascades Highway

Why Visit? Often called the “American Alps,” this area is breathtaking in the summer.
Highlights: Diablo Lake Overlook, Maple Pass Loop, and Ross Lake.
Best Time to Visit: July to September.

6. Island Hop in the San Juan Islands

Why Visit? These islands offer whale watching, kayaking, and stunning views.
Top Islands: San Juan Island, Orcas Island, and Lopez Island.
Best Time to Visit: June to September for orca sightings.

7. Hike in Leavenworth and the Alpine Lakes Wilderness

Why Visit? Leavenworth is a charming Bavarian-style village with access to world-class hiking.
Top Hikes: Colchuck Lake, The Enchantments, and Icicle Ridge.
Best Time to Visit: Mid-July to September.

8. Explore Eastern Washington’s High Desert

Why Visit? Sun-drenched landscapes, vineyards, and unique rock formations.
Top Spots: Palouse Falls, Dry Falls, and Steptoe Butte.
Best Time to Visit: June and early July before it gets too hot.

How Long is Summer in Washington State?

Summer lasts about three months, from late June to mid-September. However, warm weather can start as early as May in Eastern Washington and extend into early October in some regions.

Best Time to Visit Washington State

June: Great for early wildflowers and fewer crowds.
July: Peak summer season with the best weather.
August: Ideal for hiking, whale watching, and outdoor festivals.
September: Fewer tourists and cooler temperatures, still great for hiking.

When Are the Other Seasons in Washington State?

Spring: March to June (mild, rainy, and flowers blooming).
Fall: September to November (colorful foliage and cooler weather).
Winter: December to February (snowy in the mountains, rainy in the west).

Final Thoughts

Washington State in the summer is a paradise for nature lovers, adventure seekers, and city explorers alike. Whether you’re hiking in the Cascades, exploring Seattle, or relaxing in the San Juan Islands, summer offers the perfect mix of warm weather, long daylight hours, and endless activities.Plan your summer trip now to experience the best of Washington’s landscapes, food, and outdoor adventures!