September · Cook Islands
Best time to visit Rarotonga in September Weather, crowds & prices
Weather in Rarotonga in September
Average temperature 24°C, 74 mm of rain, about 22 days with 6+ hours of sunshine and 81% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
September score
8.8/10
Ranked #2 of 12 months
- Avg temp
- 24°C
- Rainfall
- 74 mm
- Humidity
- 81%
- Days with 6h+ sun
- 22
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$ · Moderate Cost ($$)
September in Rarotonga scores 8.8/10 for beach and coastal travel - one of the top 12-month picks (#2). Expect around 24°C, 74 mm of rain, and roughly 22 days with 6+ hours of sunshine this month.
Rarotonga is a round island of green peaks and a turquoise lagoon, easy to circle by bus or scooter.
September in Rarotonga — one of the year's strongest windows (2nd)
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.
Pack light clothing, swimwear and real sun protection, a packable rain layer.
Budget for mid-season pricing, and crowds are moderate.
Frequently asked
- What is the weather like in Rarotonga in September?
- In September, Rarotonga averages 24°C, 74 mm of rain, and about 22 days with 6+ hours of sunshine. Its climate-comfort score is 8.8/10.
- Is September a good time to visit Rarotonga?
- September earns a 8.8/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Rarotonga in September?
- Expect about 74 mm of rain in September. Average humidity is 81% and there are about 22 days with 6+ hours of sunshine.
Curated in Rarotonga
Tickets & experiences
Things to do in Rarotonga
Rarotonga, Cook Islands. Live activities and tours from GetYourGuide, matched to this destination.