Rarotonga Weather in September
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.
Rainfall in Rarotonga in September
Records from the past 30 years suggest around 11 days of rain, with 81 mm (3.2 in) average for the month. Rainfall intensity is on the higher side this month. Expect more substantial showers rather than light, passing rain.
Temperature in Rarotonga in September
September is a good time to be in Rarotonga. Days are perfect, reaching 25°C (77°F), with nights around 22°C (72°F). Overall, the month follows a fairly predictable daily temperature pattern. With overnight lows of 22°C (72°F), evenings stay pleasantly warm.
Sunshine in Rarotonga in September
The area enjoys a balanced 182 hours of sunlight, ensuring it's neither too overcast nor too sunny.
Wind Speed in Rarotonga in September
Wind speeds average 5 m/s (10 knots) during September. At this speed, gentle to moderate breezes make small trees sway and the wind creates whitecaps on water bodies. Daily variations range from moderate winds to stronger breezes, creating excellent conditions for sailing, kite flying and wind sports.If you're inclined towards comfortable temperatures and drier conditions, September is a good time to visit Rarotonga.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the Cook Islands, check out our Rarotonga's climate page.
Rarotonga Temperature in September
Min Temperature
22°C (72°F)
Max Temperature
25°C (77°F)
Chance of Rain
38%
Precipitation
81 mm (3.2 in)
Rainy days
11 days
Humidity
80%
Windspeed
5 m/s (10 knots)
Sunshine
182 hours
Percentage Sunshine
Daily Historical Temperatures
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).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Rarotonga in September
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.
Rarotonga historical weather extremes in September
The extremes listed below come from historical weather data collected in Rarotonga from 1976 through 2025.
- Rarotonga recorded its highest September temperature of 31°C (88°F) on September 11, 2003.
- Rarotonga experienced its chilliest September day on September 12, 1984, reaching only 20°C (68°F).
- The lowest overnight temperature recorded in September was 14°C (57°F) (September 3, 2003).
Best Places in the Cook Islands in September
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
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tolerable
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What to Wear in Rarotonga in September
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.What To Do in Rarotonga in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the Cook Islands, check out our Rarotonga's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed
See the full Rarotonga climate overview or explore weather in the Cook Islands.
