Summer Swimming Guide 2025

Lake Washington and Lake Sammamish offer some of the best swimming spots in the Seattle area. As temperatures rise, locals and visitors alike flock to these refreshing waters.

Lake Washington's Top Swimming Spots

Lake Washington boasts numerous beaches perfect for a summer dip:

• Matthews Beach - Seattle's largest freshwater bathing beach with a diving platform
• Madison Park Beach - A popular spot with a grassy area and swimming raft
• Madrona Park - Features a swimming platform and beautiful views
• Seward Park - Offers a long stretch of shoreline with designated swimming areas

Lake Sammamish Beaches

Lake Sammamish provides excellent swimming options as well:

• Lake Sammamish State Park - Extensive beach area with lifeguards during summer months
• Idylwood Park - A smaller, more intimate beach setting in Redmond
• Vasa Park - A private park with day-use fees that offers swimming access

Water Temperature Guide

According to our Seattle Lakes app data, here are the expected water temperatures this summer:

• Lake Washington: 68-74°F (June), 72-78°F (July), 74-80°F (August)
• Lake Sammamish: 70-76°F (June), 74-80°F (July), 76-82°F (August)

Remember that water temperatures can vary based on depth, weather conditions, and specific location on the lake.

Safety Tips

Always prioritize safety when swimming in Seattle's lakes:

• Swim in designated areas, preferably with lifeguards present
• Check current water quality reports before swimming
• Never swim alone
• Be aware of boat traffic in open water areas
• Use the Seattle Lakes app to monitor water temperatures

With these tips in mind, you're ready to enjoy a refreshing swim in Seattle's beautiful lakes this summer!