Muri in September sees high temperatures, with highs around 25°C (77°F) and overnight lows of 22°C (72°F). Rainfall is fairly high at around 81 mm (3.2 in) on average, so pack waterproofs just in case.
If you favor pleasant temperatures and minimal rainfall, September is one of the best months to visit Muri.
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Pick a month to see the average temperature, rainfall and sunshine in Muri - and find the best time to visit.
50-year average (1976-2025)
Based on our historical records, temperatures in Muri 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 Muri spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Our historical data for Muri spans 1976 to 2026, revealing these weather extremes.
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).
Comfortable temperatures call for an easy wardrobe in September. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. Expect heavy rainfall, so bring good rain protection and waterproof bags. Sunglasses could come in handy during the sunnier parts of your trip.
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Temperature Rainfall Sunshine Humidity Wind Speed
See the full Muri 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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