Climate guide for Rock Islands, Palau

Best Time to Visit
Rock Islands

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01 · Palau

About Rock Islands

The Rock Islands are a marine landscape, not a collection of interchangeable beach stops. Kayaking, snorkeling, diving, wildlife viewing, and quiet lagoon routes all depend on the chosen operator, tide, visibility, and conservation rules. Koror State requires visitor permits and regulates access to protect the lagoon, so use certified guides, carry the required permit, and follow no-touch practices around coral, wildlife, and archaeological sites. Conditions can change quickly on open water, and remote beaches do not provide the services or safety margin of town.

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Did you know?

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Travel Tips

01Best time & timing
January leads the year at 3.2/10, with February and March close behind — November (3.0/10) is the one to avoid without a specific reason.
02Weather & what to pack
In January plan for about 27°C; the month brings 370 mm of rain. Pack the lightest clothing you own, a hat and more water than feels necessary.
03Budget timing
If budget matters most, April is the cheapest month (3.1/10) — expect weather trade-offs.

Things to do in Rock Islands

Rock Islands, Palau. Live activities and tours from GetYourGuide, matched to this destination.

When to visit Rock Islands: the short answer

Plan Rock Islands for January, with February, March close behind — the stretch with the most usable temperatures and the fewest lost days to rain: January averages 27°C with 370 mm of rain and about 25 days with 6+ hours of sunshine. The months to avoid unless you have a specific reason are November, October.

Across the year Rock Islands swings from 27°C in June to 27°C in April, a 1-degree spread, while rainfall ranges from 260 mm in March to 758 mm in July. In short, Rock Islands is not equally good year-round — the gap between its best and worst month is 0.2 points on the same 10-point scale.

Warmest month: April (27°C). Coolest: June (27°C). Driest: March (260 mm). Wettest: July (758 mm).

Rock Islands month by month

January in Rock Islands — the year's strongest window

Best window · 3.2/10

Days in January average 27°C (80°F) and humidity near 85% — front-load outdoor plans before the heat builds and treat the middle of the day as indoor time.

This is the year's wettest stretch at 370 mm, but with about 25 days with 6+ hours of sunshine it is not a total loss; an indoor fallback covers the risk.

On our climate-comfort scale this is the top-ranked month of the year for Rock Islands at 3.2/10 — the reference point every other month on this page is measured against.

Expect peak pricing, and this is one of the busiest months here. You are paying the year's highest rates for the year's best conditions — book early or shift a few weeks either side.

Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a proper rain shell rather than an umbrella.

February in Rock Islands — off-season conditions

Hardest · 3.2/10

Days in February average 27°C (80°F) and humidity near 83% — front-load outdoor plans before the heat builds and treat the middle of the day as indoor time.

This is the year's wettest stretch at 264 mm, but with about 23 days with 6+ hours of sunshine it is not a total loss; an indoor fallback covers the risk.

That is 3.2/10 on the same scale — 2nd of 12 months, versus 3.2/10 for the best month here.

Budget for peak pricing, and this is one of the busiest months here. You are paying the year's highest rates for the year's best conditions — book early or shift a few weeks either side.

Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a proper rain shell rather than an umbrella.

March in Rock Islands — off-season conditions

Hardest · 3.2/10

March averages 27°C (80°F) and humidity near 84%, so the practical pattern is early mornings, a long midday break, and evenings back outside.

260 mm makes this the wettest stretch of the year, though about 28 days with 6+ hours of sunshine still appear — keep an indoor fallback ready.

It scores 3.2/10 here, 3rd of 12 months, against 3.2/10 in the destination's best month.

Figure on peak pricing, with this is one of the busiest months here. You are paying the year's highest rates for the year's best conditions — book early or shift a few weeks either side.

Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a proper rain shell rather than an umbrella.

April in Rock Islands — off-season conditions

Hardest · 3.1/10

Days in April average 27°C (81°F) and humidity near 85% — front-load outdoor plans before the heat builds and treat the middle of the day as indoor time.

This is the year's wettest stretch at 380 mm, but with about 24 days with 6+ hours of sunshine it is not a total loss; an indoor fallback covers the risk.

That is 3.1/10 on the same scale — 5th of 12 months, versus 3.2/10 for the best month here.

Budget for mid-season pricing, and crowds are moderate.

Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a proper rain shell rather than an umbrella.

May in Rock Islands — the hardest end of the year

Hardest · 3.1/10

May averages 27°C (81°F) and humidity near 88%, so the practical pattern is early mornings, a long midday break, and evenings back outside.

430 mm makes this the wettest stretch of the year, though about 24 days with 6+ hours of sunshine still appear — keep an indoor fallback ready.

It scores 3.1/10 here, 6th of 12 months, against 3.2/10 in the destination's best month.

Plan for mid-season pricing, with crowds are moderate.

Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a proper rain shell rather than an umbrella.

June in Rock Islands — off-season conditions

Hardest · 3.1/10

Days in June average 27°C (80°F) and humidity near 89% — front-load outdoor plans before the heat builds and treat the middle of the day as indoor time.

This is the year's wettest stretch at 549 mm, but with about 20 days with 6+ hours of sunshine it is not a total loss; an indoor fallback covers the risk.

That is 3.1/10 on the same scale — 7th of 12 months, versus 3.2/10 for the best month here.

Expect mid-season pricing, and crowds are moderate.

Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a proper rain shell rather than an umbrella.

July in Rock Islands — off-season conditions

Hardest · 3.1/10

Days in July average 27°C (80°F) and humidity near 89% — front-load outdoor plans before the heat builds and treat the middle of the day as indoor time.

This is the year's wettest stretch at 758 mm, but with about 20 days with 6+ hours of sunshine it is not a total loss; an indoor fallback covers the risk.

That is 3.1/10 on the same scale — 8th of 12 months, versus 3.2/10 for the best month here.

Budget for mid-season pricing, and crowds are moderate.

Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a proper rain shell rather than an umbrella.

August in Rock Islands — off-season conditions

Hardest · 3.2/10

August averages 27°C (80°F) and humidity near 88%, so the practical pattern is early mornings, a long midday break, and evenings back outside.

649 mm makes this the wettest stretch of the year, though about 23 days with 6+ hours of sunshine still appear — keep an indoor fallback ready.

It scores 3.2/10 here, 4th of 12 months, against 3.2/10 in the destination's best month.

Figure on peak pricing, with this is one of the busiest months here.

Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a proper rain shell rather than an umbrella.

September in Rock Islands: expect compromises

Hardest · 3.1/10

September averages 27°C (80°F) and humidity near 87%, so the practical pattern is early mornings, a long midday break, and evenings back outside.

553 mm makes this the wettest stretch of the year, though about 22 days with 6+ hours of sunshine still appear — keep an indoor fallback ready.

It scores 3.1/10 here, 9th of 12 months, against 3.2/10 in the destination's best month.

Figure on mid-season pricing, with crowds are moderate.

Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a proper rain shell rather than an umbrella.

October in Rock Islands — off-season conditions

Hardest · 3/10

Days in October average 27°C (80°F) and humidity near 87% — front-load outdoor plans before the heat builds and treat the middle of the day as indoor time.

This is the year's wettest stretch at 508 mm, but with about 21 days with 6+ hours of sunshine it is not a total loss; an indoor fallback covers the risk.

That is 3/10 on the same scale — 11th of 12 months, versus 3.2/10 for the best month here.

Budget for low-season pricing, and crowds are light for this destination.

Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a proper rain shell rather than an umbrella.

November in Rock Islands: expect compromises

Hardest · 3/10

Days in November average 27°C (80°F) and humidity near 88% — front-load outdoor plans before the heat builds and treat the middle of the day as indoor time.

This is the year's wettest stretch at 415 mm, but with about 24 days with 6+ hours of sunshine it is not a total loss; an indoor fallback covers the risk.

That is 3/10 on the same scale — 12th of 12 months, versus 3.2/10 for the best month here.

Budget for low-season pricing, and crowds are light for this destination.

Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a proper rain shell rather than an umbrella.

December in Rock Islands — the hardest end of the year

Hardest · 3.1/10

December averages 27°C (80°F) and humidity near 87%, so the practical pattern is early mornings, a long midday break, and evenings back outside.

436 mm makes this the wettest stretch of the year, though about 24 days with 6+ hours of sunshine still appear — keep an indoor fallback ready.

It scores 3.1/10 here, 10th of 12 months, against 3.2/10 in the destination's best month.

Plan for mid-season pricing, with crowds are moderate.

Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a proper rain shell rather than an umbrella.

FAQ

Frequently asked

When is the best time to visit Rock Islands, Palau?
In Ideal Weather mode, the best months to visit Rock Islands are January, February, March. January is the single peak month with an Ideal Weather score of 3.2/10 based on temperature, rainfall, humidity, daylight and days with 6+ hours of sunshine.
What is the weather like in Rock Islands year-round?
Rock Islands has a climate profile suited to sightseeing and cultural travel. Average monthly temperatures range from 27°C in June to 27°C in April, with Ideal Weather scores between 3.0 and 3.2 out of 10.
Which months should I avoid in Rock Islands?
The lowest Ideal Weather-scoring months in Rock Islands are October (3.0/10), November (3.0/10), April (3.1/10). These months typically combine less comfortable temperatures, higher rainfall or fewer days with 6+ hours of sunshine.
When is the rainy season in Rock Islands?
July is the wettest month in Rock Islands, averaging about 758 mm of rainfall. March is the driest, at roughly 260 mm.
Which is the sunniest month in Rock Islands?
March sees the most sun in Rock Islands, with about 28 days with 6+ hours of sunshine on average - ideal for outdoor plans.
Is Rock Islands a good destination for sightseeing and cultural travel?
Rock Islands is well suited to sightseeing and cultural travel. Its highest Ideal Weather window (January, February, March) aligns with the conditions travelers usually look for in this style of trip.
How is the bestime.to score for Rock Islands calculated?
Each month receives an Ideal Weather score from 0-10 using ERA5 climate normals for Rock Islands: temperature comfort, precipitation, humidity, daylight hours, and days with 6+ hours of sunshine - weighted for sightseeing and cultural travel.

Climate data: Open-Meteo ERA5 historical archive, the five most recent complete years (2021–2025). Scores are monthly averages for that window, not forecasts, and short-window precipitation can differ from longer-term normals. “Sunny days” count days with at least 6 hours of measured sunshine — they are not dry days.

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