Climate guide for Rarotonga, Cook Islands

Best Time to Visit
Rarotonga

How to read the score (0–10)
05810
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01 · Cook Islands

About Rarotonga

Rarotonga rises in the middle of the Cook Islands, small enough to circle by bus or scooter, with Avarua as its main town and Muri Beach the best-known stretch of lagoon. The Cross-Island Track climbs to the peaks through rainforest, and the Saturday market brings produce, crafts and food. The dry season from April to November is the most reliable; December to March is warmer and wetter.

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Did you know?

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Travel Tips

01Best time & timing
The strongest months are November, September, October: November peaks at 9.3/10, while May drops to 5.8/10.
02Weather & what to pack
24°C and 53 mm of rain shape a typical November here. Pack light clothing, swimwear and strong sun protection.
03Crowds & value
Book early for February, the busiest stretch; October is the value window at 8.7/10.

Things to do in Rarotonga

Rarotonga, Cook Islands. Live activities and tours from GetYourGuide, matched to this destination.

When to visit Rarotonga: the short answer

The best time to visit Rarotonga is November, followed by September, October. Those months combine the most usable temperatures with the fewest lost days to rain: November averages 24°C with 53 mm of rain and about 30 days with 6+ hours of sunshine. The months to avoid unless you have a specific reason are May, April. If budget matters more than perfect weather, May is the strongest of the low-rate months at 5.8/10.

Across the year Rarotonga swings from 23°C in August to 27°C in March, a 4-degree spread, while rainfall ranges from 53 mm in November to 219 mm in March. That is the whole planning problem in one sentence: Rarotonga is not equally good year-round, and the difference between the best and worst month here is 3.5 points on a 10-point scale.

Warmest month: March (27°C). Coolest: August (23°C). Driest: November (53 mm). Wettest: March (219 mm).

Rarotonga month by month

January in Rarotonga: strong conditions, 6th of 12

Good · 7.5/10

January averages 26°C (79°F) and humidity near 83%, so the practical pattern is early mornings, a long midday break, and evenings back outside.

Monthly rainfall reaches 184 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 7.5/10 here, 6th of 12 months, against 9.3/10 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.

Flexible dates? November scores 1.8 points higher here — enough to change the trip.

February in Rarotonga — reliably good (5th best month)

Good · 8.1/10

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

Monthly rainfall reaches 126 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 8.1/10 here, 5th of 12 months, against 9.3/10 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.

March in Rarotonga — reliably good (10th best month)

Good · 7.3/10

Days in March average 27°C (81°F) and humidity near 82% — 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 219 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 7.3/10 on the same scale — 10th of 12 months, versus 9.3/10 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.

If your dates are flexible, November is materially better in Rarotonga — 2 points higher on the same scale.

April in Rarotonga: strong conditions, 11th of 12

Good · 7.3/10

April averages 27°C (80°F) and humidity near 79%, so the practical pattern is early mornings, a long midday break, and evenings back outside.

At 135 mm this is a genuinely wet month: about 18 days with 6+ hours of sunshine in total, and outdoor plans need an indoor fallback.

It scores 7.3/10 here, 11th of 12 months, against 9.3/10 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.

Flexible dates? November scores 2 points higher here — enough to change the trip.

May in Rarotonga — middling scores, decent value

Trade-offs · 5.8/10

Days in May average 26°C (79°F) and humidity near 81% — front-load outdoor plans before the heat builds and treat the middle of the day as indoor time.

167 mm of rain signals a properly wet month, with only about 9 days with 6+ hours of sunshine to count on — build indoor options into the schedule.

That is 5.8/10 on the same scale — 12th of 12 months, versus 9.3/10 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.

If your dates are flexible, November is materially better in Rarotonga — 3.5 points higher on the same scale.

June holds up well in Rarotonga — 7th best month

Good · 7.5/10

June averages 25°C (77°F) — warm enough for beach and boat plans, still short of the heat that pushes sightseeing into early morning.

Rainfall runs 57 mm, so plan one flexible day in three; you still get about 10 days with 6+ hours of sunshine and 10.7 hours of daylight.

It scores 7.5/10 here, 7th of 12 months, against 9.3/10 in the destination's best month.

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

Pack light clothing, swimwear and real sun protection, a packable rain layer.

Flexible dates? November scores 1.8 points higher here — enough to change the trip.

July in Rarotonga — reliably good (8th best month)

Good · 7.5/10

July averages 24°C (75°F) — warm enough for beach and boat plans, still short of the heat that pushes sightseeing into early morning.

Rainfall runs 71 mm, so plan one flexible day in three; you still get about 12 days with 6+ hours of sunshine and 10.8 hours of daylight.

It scores 7.5/10 here, 8th of 12 months, against 9.3/10 in the destination's best month.

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

Pack light clothing, swimwear and real sun protection, a packable rain layer.

Flexible dates? November scores 1.8 points higher here — enough to change the trip.

August holds up well in Rarotonga — 4th best month

Good · 8.2/10

With 23°C (74°F) on average, August delivers classic beach weather: plenty of time in the water, with beach and boat plans rarely disrupted by cold.

Budget for roughly 66 mm of rain this month — a flexible day or two helps — with about 16 days with 6+ hours of sunshine and 11.3 hours of daylight to work around it.

That is 8.2/10 on the same scale — 4th of 12 months, versus 9.3/10 for the best month here.

Expect mid-season pricing, and this is one of the busiest months here.

Pack light clothing, swimwear and real sun protection, a packable rain layer.

September in Rarotonga — one of the year's strongest windows (2nd)

Best window · 8.8/10

With 24°C (74°F) on average, September delivers classic beach weather: plenty of time in the water, with beach and boat plans rarely disrupted by cold.

Budget for roughly 74 mm of rain this month — a flexible day or two helps — with about 22 days with 6+ hours of sunshine and 11.9 hours of daylight to work around it.

On our climate-comfort scale this is one of the strongest months of the year for Rarotonga at 8.8/10 (2nd of 12), just behind November at 9.3/10.

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

Pack light clothing, swimwear and real sun protection, a packable rain layer.

October ranks 3rd of 12 for Rarotonga — one of the best windows

Best window · 8.7/10

October averages 24°C (74°F) — warm enough for beach and boat plans, still short of the heat that pushes sightseeing into early morning.

Rainfall runs 84 mm, so plan one flexible day in three; you still get about 28 days with 6+ hours of sunshine and 12.5 hours of daylight.

A 8.7/10 puts this among the year's best months in Rarotonga (3rd of 12); only November scores higher, at 9.3/10.

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

Pack light clothing, swimwear and real sun protection, a packable rain layer.

November in Rarotonga tops the year's climate scores

Best window · 9.3/10

November averages 24°C (75°F) — warm enough for beach and boat plans, still short of the heat that pushes sightseeing into early morning.

Rainfall runs 53 mm, so plan one flexible day in three; you still get about 30 days with 6+ hours of sunshine and 13 hours of daylight.

On our climate-comfort scale this is the top-ranked month of the year for Rarotonga at 9.3/10 — the reference point every other month on this page is measured against.

Plan for 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 light clothing, swimwear and real sun protection, a packable rain layer.

December in Rarotonga: strong conditions, 9th of 12

Good · 7.5/10

With 25°C (78°F) on average, December delivers classic beach weather: plenty of time in the water, with beach and boat plans rarely disrupted by cold.

190 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 7.5/10 on the same scale — 9th of 12 months, versus 9.3/10 for the best month here.

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

Pack light clothing, swimwear and real sun protection, a proper rain shell rather than an umbrella.

If your dates are flexible, November is materially better in Rarotonga — 1.8 points higher on the same scale.

FAQ

Frequently asked

When is the best time to visit Rarotonga, Cook Islands?
In Ideal Weather mode, the best months to visit Rarotonga are November, September, October. November is the single peak month with an Ideal Weather score of 9.3/10 based on temperature, rainfall, humidity, daylight and days with 6+ hours of sunshine.
What is the weather like in Rarotonga year-round?
Rarotonga has a climate profile suited to beach and coastal travel. Average monthly temperatures range from 23°C in August to 27°C in March, with Ideal Weather scores between 5.8 and 9.3 out of 10.
Which months should I avoid in Rarotonga?
The lowest Ideal Weather-scoring months in Rarotonga are May (5.8/10), March (7.3/10), April (7.3/10). These months typically combine less comfortable temperatures, higher rainfall or fewer days with 6+ hours of sunshine.
When is the rainy season in Rarotonga?
March is the wettest month in Rarotonga, averaging about 219 mm of rainfall. November is the driest, at roughly 53 mm.
Which is the sunniest month in Rarotonga?
November sees the most sun in Rarotonga, with about 30 days with 6+ hours of sunshine on average - ideal for outdoor plans.
Is Rarotonga a good destination for beach and coastal travel?
Rarotonga is well suited to beach and coastal travel. Its highest Ideal Weather window (November, September, October) aligns with the conditions travelers usually look for in this style of trip.
How is the bestime.to score for Rarotonga calculated?
Each month receives an Ideal Weather score from 0-10 using ERA5 climate normals for Rarotonga: temperature comfort, precipitation, humidity, daylight hours, and days with 6+ hours of sunshine - weighted for beach and coastal 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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