Beach & water quality guide — which coast to visit, top beaches, and what to expect
Both South and West Maui coasts are excellent in summer. South swells occasionally hit the south coast but are usually mild. West Maui enjoys flat calm water perfect for snorkeling at Black Rock and Kapalua Bay. Water temperatures reach their warmest (79–81°F). The Road to Hana beaches are more accessible with drier conditions.
These beaches have elevated risk factors this month. Check current conditions before you go.
Hawaiʻi DOH recommends avoiding affected waters for 48–72 hours after heavy rain has stopped and the beach has received full sunshine. This is a precaution, not a prediction of recovery. Elapsed time, dry weather and clear-looking water do not establish current water quality. Check current DOH advisories and posted signs; an active advisory remains in effect until DOH lifts it. Stay out of brown or murky water. Rainy-day alternatives: Maui Ocean Center, Iʻao Valley (if not flooding), Lahaina town shopping and galleries, upcountry Maui farm tours.
Maui Film Festival (June) and the Kapalua Wine & Food Festival bring visitors. Slack-key guitar festivals showcase Hawaiian music. Calm ocean conditions make summer ideal for Molokini snorkel tours.
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Maui in May is in the dry season with calm ocean conditions, warm water, and minimal rainfall. Average rainfall is 0.3 inches (on the dry side), water temperature is 79–81°F, and advisory risk is low–moderate. Dry season — excellent swimming conditions across most beaches
In May, most of Maui's coastline is excellent for swimming. Both South and West coasts are ideal. Snorkeling at Molokini and Kapalua Bay is at its best.
Yes, it can rain on Maui in May, but conditions vary dramatically by location. The dry/leeward side averages about 0.3 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 Maui in May include Ka'anapali Beach, Napili Bay, Kapalua Bay. These are recommended for May 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.
This site does not recommend or advise anyone to swim at any beach. We share government data and geographic analysis so you can make your own informed decisions. By using this site you accept full responsibility for your own safety. See our Terms of Use for full details.
When in doubt, don't go out. 🤙