Beach & water quality guide — which coast to visit, top beaches, and what to expect
The Kohala Coast is at its absolute best in summer — dry, calm, and warm. Kona Coast beaches are excellent with minimal rainfall. Even the Hilo side gets somewhat drier, though it still receives more rain than the west side. Summer brings the calmest ocean conditions island-wide, making it ideal for snorkeling at Captain Cook and Two Step.
These beaches have elevated risk factors this month. Check current conditions before you go.
The Big Island has the most dramatic weather variation of any Hawaiian island. The Kohala and Kona coasts recover within 24 hours because they get so little rain. The Hilo side can take 72+ hours and receives 10x more rainfall. Rainy-day alternatives: Hawaiʻi Volcanoes National Park (lava tubes are underground), Kona coffee farm tours, Mauna Kea summit (above the clouds), Hilo Farmers Market.
The Merrie Monarch Festival (April) in Hilo is Hawaii’s premier hula competition. Iron Man World Championship (October) takes over Kailua-Kona. Summer brings optimal conditions for manta ray night snorkels and Kealakekua Bay snorkeling.
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Big Island in July is in the dry season with calm ocean conditions, warm water, and minimal rainfall. Average rainfall is 0.5 inches (on the dry side), water temperature is 78–80°F, and advisory risk is low. Dry season — excellent swimming conditions across most beaches
In July, most of Big Island's coastline is excellent for swimming. The Kohala Coast is perfect. Captain Cook and Two Step offer world-class snorkeling.
Yes, it can rain on Big Island in July, but conditions vary dramatically by location. The dry/leeward side averages about 0.5 inches for the month, while the wet/windward side can receive 5-10x that amount. Summer months have minimal rainfall, making water quality concerns much lower.
The best beaches on Big Island in July include Two Step (Honaunau), Hapuna Beach, Kealakekua Bay. These are recommended for July because dry-season conditions bring calm water, warm temperatures, and excellent visibility.
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⚠️ Important Disclaimer
Safe to Swim Hawaii is an independent passion project — not affiliated with the Hawaii Department of Health or any government agency. Water quality ratings are estimates based on publicly available testing data and seasonal patterns. They are not real-time measurements and may not reflect current conditions.
Always verify current water quality conditions with the Hawaii DOH Clean Water Branch before entering the water.
When in doubt, don't go out. 🤙