Climate guide for Rabaul, Papua New Guinea

Best Time to Visit
Rabaul

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01 · Papua New Guinea

About Rabaul

Rabaul's landscape is shaped by volcanoes, a flooded caldera, wartime tunnels and relics, hot springs, and the wider waters of East New Britain. A strong visit combines the town's history with guided volcano viewpoints, cultural stops, and carefully operated dive or boat trips. Ash, rain, tides, and volcanic conditions can change access, so check local and official updates before setting out. Use experienced guides, never enter unstable wartime structures or restricted volcanic areas, ask before photographing communities, and leave a weather buffer around flights.

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Did you know?

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Travel Tips

01Best time & timing
The strongest months are September, August, June: September peaks at 5.3/10, while December drops to 4.1/10.
02Weather & what to pack
27°C and 117 mm of rain shape a typical September here. Pack the lightest clothing you own, a hat and more water than feels necessary.
03Budget timing
The lowest rates fall in June; treat it as a budget pick rather than a weather pick (4.9/10).

Things to do in Rabaul

Rabaul, Papua New Guinea. Live activities and tours from GetYourGuide, matched to this destination.

When to visit Rabaul: the short answer

The best time to visit Rabaul is September, followed by August, June. Those months combine the most usable temperatures with the fewest lost days to rain: September averages 27°C with 117 mm of rain and about 27 days with 6+ hours of sunshine. The months to avoid unless you have a specific reason are December, May.

Across the year Rabaul swings from 27°C in April to 27°C in October, a 1-degree spread, while rainfall ranges from 117 mm in September to 309 mm in December. That is the whole planning problem in one sentence: Rabaul is not equally good year-round, and the difference between the best and worst month here is 1.2 points on a 10-point scale.

Warmest month: October (27°C). Coolest: April (27°C). Driest: September (117 mm). Wettest: December (309 mm).

Rabaul month by month

January in Rabaul — the hardest end of the year

Hardest · 4.1/10

January averages 27°C (81°F) and humidity near 83%, so the practical pattern is early mornings, a long midday break, and evenings back outside.

234 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 4.1/10 here, 7th of 12 months, against 5.3/10 in the destination's best month.

Plan for low-season pricing, with 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.

February in Rabaul — the hardest end of the year

Hardest · 4.1/10

February averages 27°C (81°F) and humidity near 85%, so the practical pattern is early mornings, a long midday break, and evenings back outside.

305 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 4.1/10 here, 8th of 12 months, against 5.3/10 in the destination's best month.

Plan for low-season pricing, with 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.

March in Rabaul — the hardest end of the year

Hardest · 4.1/10

Days in March average 27°C (81°F) and humidity near 84% — 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 244 mm, but with about 28 days with 6+ hours of sunshine it is not a total loss; an indoor fallback covers the risk.

That is 4.1/10 on the same scale — 9th of 12 months, versus 5.3/10 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.

April in Rabaul: expect compromises

Hardest · 4.1/10

April averages 27°C (80°F) and humidity near 86%, so the practical pattern is early mornings, a long midday break, and evenings back outside.

305 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 4.1/10 here, 10th of 12 months, against 5.3/10 in the destination's best month.

Figure on low-season pricing, with 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.

May in Rabaul: expect compromises

Hardest · 4.1/10

Days in May 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 256 mm, but with about 26 days with 6+ hours of sunshine it is not a total loss; an indoor fallback covers the risk.

That is 4.1/10 on the same scale — 11th of 12 months, versus 5.3/10 for the best month here.

Expect 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.

June in Rabaul — the hardest end of the year

Hardest · 4.9/10

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

Monthly rainfall reaches 143 mm — wet for this destination — but about 28 days with 6+ hours of sunshine still break through, so keep one indoor fallback in the plan.

It scores 4.9/10 here, 3rd of 12 months, against 5.3/10 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.

July in Rabaul — off-season conditions

Hardest · 4.6/10

July averages 27°C (80°F) and humidity near 83%, so the practical pattern is early mornings, a long midday break, and evenings back outside.

Monthly rainfall reaches 182 mm — wet for this destination — but about 27 days with 6+ hours of sunshine still break through, so keep one indoor fallback in the plan.

It scores 4.6/10 here, 5th of 12 months, against 5.3/10 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.

August in Rabaul — workable with trade-offs

Trade-offs · 5.1/10

Days in August average 27°C (80°F) and humidity near 81% — front-load outdoor plans before the heat builds and treat the middle of the day as indoor time.

132 mm of rain makes this a wet month here, though with about 29 days with 6+ hours of sunshine there is still bright weather between the fronts.

That is 5.1/10 on the same scale — 2nd of 12 months, versus 5.3/10 for the best month here.

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.

September in Rabaul — the year's strongest window

Best window · 5.3/10

Days in September average 27°C (81°F) and humidity near 80% — front-load outdoor plans before the heat builds and treat the middle of the day as indoor time.

117 mm of rain makes this a wet month here, though with about 27 days with 6+ hours of sunshine there is still bright weather between the fronts.

On our climate-comfort scale this is the top-ranked month of the year for Rabaul at 5.3/10 — the reference point every other month on this page is measured against.

Budget for peak pricing, and crowds are moderate. 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.

October in Rabaul — off-season conditions

Hardest · 4.8/10

October averages 27°C (81°F) and humidity near 80%, so the practical pattern is early mornings, a long midday break, and evenings back outside.

Monthly rainfall reaches 145 mm — wet for this destination — but about 29 days with 6+ hours of sunshine still break through, so keep one indoor fallback in the plan.

It scores 4.8/10 here, 4th of 12 months, against 5.3/10 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.

November in Rabaul — the hardest end of the year

Hardest · 4.5/10

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

Monthly rainfall reaches 170 mm — wet for this destination — but about 29 days with 6+ hours of sunshine still break through, so keep one indoor fallback in the plan.

It scores 4.5/10 here, 6th of 12 months, against 5.3/10 in the destination's best month.

Plan for low-season pricing, with crowds are light for this destination. That combination — decent conditions at the lowest rates of the year — is the best value window on this page.

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 Rabaul — off-season conditions

Hardest · 4.1/10

Days in December average 27°C (80°F) and humidity near 86% — 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 309 mm, but with about 28 days with 6+ hours of sunshine it is not a total loss; an indoor fallback covers the risk.

That is 4.1/10 on the same scale — 12th of 12 months, versus 5.3/10 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.

FAQ

Frequently asked

When is the best time to visit Rabaul, Papua New Guinea?
In Ideal Weather mode, the best months to visit Rabaul are September, August, June. September is the single peak month with an Ideal Weather score of 5.3/10 based on temperature, rainfall, humidity, daylight and days with 6+ hours of sunshine.
What is the weather like in Rabaul year-round?
Rabaul has a climate profile suited to sightseeing and cultural travel. Average monthly temperatures range from 27°C in April to 27°C in October, with Ideal Weather scores between 4.1 and 5.3 out of 10.
Which months should I avoid in Rabaul?
The lowest Ideal Weather-scoring months in Rabaul are January (4.1/10), February (4.1/10), March (4.1/10). These months typically combine less comfortable temperatures, higher rainfall or fewer days with 6+ hours of sunshine.
When is the rainy season in Rabaul?
December is the wettest month in Rabaul, averaging about 309 mm of rainfall. September is the driest, at roughly 117 mm.
Which is the sunniest month in Rabaul?
August sees the most sun in Rabaul, with about 29 days with 6+ hours of sunshine on average - ideal for outdoor plans.
Is Rabaul a good destination for sightseeing and cultural travel?
Rabaul is well suited to sightseeing and cultural travel. Its highest Ideal Weather window (September, August, June) aligns with the conditions travelers usually look for in this style of trip.
How is the bestime.to score for Rabaul calculated?
Each month receives an Ideal Weather score from 0-10 using ERA5 climate normals for Rabaul: 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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Curated in Rabaul

Tickets & experiences