Thinking of visiting Rarotonga in September? Expect high temperatures reaching 25°C (77°F) during the day, dropping to 22°C (72°F) at night, and note that quite a bit of rainfall is likely.
If you're inclined towards comfortable temperatures and drier conditions, September is a good time to visit Rarotonga.
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Pick a month to see the average temperature, rainfall and sunshine in Rarotonga - and find the best time to visit.
50-year average (1976-2025)
Based on our historical records, temperatures in Rarotonga typically stay consistent throughout September, with daily highs averaging around 25°C (77°F). Nights are warm, with lows around 21°C (70°F).
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Browse day-by-day weather records for Rarotonga spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
The extremes listed below come from historical weather data collected in Rarotonga from 1976 through 2026.
Find out more about the weather in the Cook Islands and which places have the best travel conditions in this month. See all of the Cook Islands in September →
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
Pleasant temperatures in September mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Prepare for significant rainfall with proper waterproof clothing and shoes. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Temperature Rainfall Sunshine Humidity Wind Speed
See the full Rarotonga climate overview or explore weather in the Cook Islands.
Where to go in September - average daytime high across popular destinations.
Penrhyn
29°C (84°F) Aitutaki26°C (79°F) Arutanga26°C (79°F) Muri25°C (77°F) Avarua25°C (77°F) Arorangi25°C (77°F) Rarotonga25°C (77°F) Ngatangiia25°C (77°F) Need travel inspiration? Check out our bucket list articles and be inspired.
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