When To Go · Destination Guide

Koror and the Rock Islands

Current-swept reefs, quiet lagoon days and a practical Koror base.

When to go

Best time to visit Koror and the Rock Islands

Use FebruaryApril as a drier planning preference, with rain possible in every month.

Best overall window

Month bands describe broad climate patterns, not measured monthly visibility, prices or cancellation probabilities.

Outside that window

Drier months are not necessarily the calmest months on every reef.

Start with the overall answer, then switch only when scuba, freedive, snorkel, or topside timing changes the trip in a meaningful way.

The overall row stays visible so you can compare it against the currently selected scope.

BestGoodTradeoffsMore variable

Scope	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Overall	Overall - Jan: More variable	Overall - Feb: Tradeoffs	Overall - Mar: Tradeoffs	Overall - Apr: Tradeoffs	Overall - May: Tradeoffs	Overall - Jun: Tradeoffs	Overall - Jul: Tradeoffs	Overall - Aug: Tradeoffs	Overall - Sep: Tradeoffs	Overall - Oct: Tradeoffs	Overall - Nov: Tradeoffs	Overall - Dec: More variable

These do not replace the overall planner. Use them only if a specific animal or event is driving your trip dates.

German Channel reef manta feeding
Best for Scuba
Nov to Jan
JanFebMarAprMayJunJulAugSepOctNovDec
The IUCN SSC assessment records feeding observations in NovemberJanuary during 20132024, with some reef mantas present yearround.
Reef sharks around Ngemelis
Best for Scuba
Year-round
JanFebMarAprMayJunJulAugSepOctNovDec
Repeated observations support reefshark interest through the year.
Ulong camouflage grouper spawning
Best for Scuba
Jun to Jul
JanFebMarAprMayJunJulAugSepOctNovDec
The conservation assessment describes an annual prenewmoon aggregation in June or July, based on observations through 2024.
Jellyfish Lake population and access check
Best for Snorkel
Check current season
CRRF's latest reviewed observation is dated 20261013 and reports more than 100,000 golden jellyfish with a favorable shortterm forecast.

Storm Disruptions.
Sun exposure stays high even when conditions are easy.
Month bands describe broad climate patterns, not measured monthly visibility, prices or cancellation probabilities.

Jul to Sep: Local west/southwest monsoon episodes can affect exposed boat routes.
Dec to Mar: Regional hindcast shows greater ocean-wave activity in these months; local shelter and actual forecasts matter.

Built from climate references, access rules, and destination operators. Wildlife timing and route flexibility can shift year to year.