Penrhyn in September sees high temperatures, with highs around 29°C (84°F) and overnight lows of 26°C (79°F). It's the driest month of the year, with very little rainfall to worry about.
If you're inclined towards comfortable temperatures and drier conditions, September is a good time to visit Penrhyn.
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Pick a month to see the average temperature, rainfall and sunshine in Penrhyn - and find the best time to visit.
43-year average (1976-2025)
Based on our historical records, temperatures in Penrhyn typically stay consistent throughout September, with daily highs averaging around 29°C (84°F). Nights are warm, with lows around 26°C (79°F).
Browse day-by-day weather records for Penrhyn spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Our historical data for Penrhyn spans 2004 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).
Warm but pleasant conditions in Penrhyn in September. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. Expect heavy rainfall, so bring good rain protection and waterproof bags. Bring sunglasses since you'll have some sunny periods throughout the month
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Temperature Rainfall Sunshine Humidity
See the full Penrhyn 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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