May marks the beginning of the wetter months with increasing afternoon showers and higher humidity. Diving is still possible but expect more variable surface conditions.
Lukas from Munich, Germany derivative work: Inkey CC BY-SA 4.0 Wikimedia Commons
Average daily low and high (°C) and monthly rainfall. The badge shows how it feels, allowing for humidity.
Average temperature across Palau in May.
Main Hub
May brings noticeably more rain and occasional rough seas as the southwest monsoon gains strength, so expect some afternoon thunderstorms that can force postponement of dive trips. Urban puddles form quickly on Koror’s low-lying streets; schedule sightseeing for mornings and pack sandals that dry fast. Ferry crossings to Babeldaob and the Rock Islands are still routine but operators may consolidate departures on stormy days.
Interior & North
May signals the beginning of the wetter half of the year on Babeldaob; afternoon thunderstorms become common and river crossings can be higher and swifter. Small village trails roughen quickly after downpours, so guide-led trips are prudent if you plan to explore interior sites. Expect fewer day-trippers and more wildlife activity in the mornings, but also bring waterproof footwear and be prepared for muddy paths.
Diving, Kayaking & Snorkeling
May brings a rise in runoff and the outer blue-water sites start to feel the effects-visibility inside the lagoon remains usable but can be patchy after heavy rains. Sea conditions become a touch choppier, so fragile-boat operators may curtail open-ocean passages; morning launches are the safest bet for boat trips. Travelers should bring a dry bag, and if you’re aiming for top snorkeling visibility, consider booking flexible dates.
Southern Historic Islands
May signals the start of more frequent rain and stronger sea swells, which can make the short boat ride from Koror to Peleliu rougher and sometimes irregular. Many visitors will prefer to schedule a day trip in the morning when seas are calmer or consider overnight stays to avoid cancelled returns. Bring waterproof bags for cameras and flexible travel plans if relying on these ferry runs.
Kayangel, Ngarchelong
May brings more frequent showers and a choppier swell across the outer reef, making visits to outer cays less predictable and sometimes cancelled on short notice. Water near channels will show runoff and visibility becomes more variable, so check with operators about likely conditions before booking. Expect rugged, low-service island experiences and plan for weather-related flexibility.
There are no major festivals or events in Palau during May to be aware of.
See how May compares with the rest of the year, then read the full guide.