Penrhyn Weather in September
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.
Rainfall in Penrhyn in September
This month sees the least rain of the year, making it well suited for outdoor adventures. Past climate data indicates that roughly 13 days will see rain, totalling around 92 mm (3.6 in) for the month. The rain this month tends to fall in heavier spells rather than light drizzle. When it rains, showers can be significant.
Temperature in Penrhyn in September
September is a good time to be in Penrhyn. Days are perfect, reaching 29°C (84°F), with nights around 26°C (79°F). The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. Nights remain warm at around 26°C (79°F). For a more comfortable sleep, a cold shower before bed and a fan or air conditioning can make a big difference.
Sunshine in Penrhyn in September
The area experiences a moderate amount of sunshine, with approximately 189 hours of sunlight expected. This means a decent mix of sun and overcast.If you're inclined towards comfortable temperatures and drier conditions, September is a good time to visit Penrhyn.
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 Penrhyn's climate page.
Penrhyn Temperature in September
Min Temperature
26°C (79°F)
Max Temperature
29°C (84°F)
Chance of Rain
43%
Precipitation
92 mm (3.6 in)
Rainy days
13 days
Humidity
82%
Sunshine
189 hours
Percentage Sunshine
Daily Historical Temperatures
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).
Average temperatures in September
Historical weather for Penrhyn in September
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.
Penrhyn historical weather extremes in September
Our historical data for Penrhyn spans 2004 to 2025, revealing these weather extremes.
- On September 23, 2017, temperatures climbed to 35°C (95°F), marking the warmest September day on record.
- The coldest September day was on September 23, 2008, with a maximum of 26°C (79°F).
- Penrhyn registered its coldest September night on September 10, 2024, with temperatures dropping to 21°C (70°F).
- The wettest September day on record brought 58 mm (2.3 in) of precipitation to Penrhyn (September 28, 2023).
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 →
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What to Wear in Penrhyn in September
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 monthWhat To Do in Penrhyn 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 Penrhyn's climate page.
Temperature Rainfall Sunshine Humidity
See the full Penrhyn climate overview or explore weather in the Cook Islands.
