Cook Islands · AutumnMonth summary
Cook Islands weather in September
✅ Good
🌡️ Temperature min / max
68°F – 72°F
🌧 Rainy days
39% of days
☀️ Sunshine
11.0h per day on average
🌊 🌊 Season
Autumn
⭐ ⭐ Weather score
7.5/10
📅 📅 Best month
October (7.7/10)
Quick decision
Should you visit Cook Islands in September?
✅ Good
✅ Yes if: you want shoulder-season value — fewer crowds, 22°F.
❌ No if: you need maximum sunshine — some overcast days are possible.
Our take: Favourable conditions in September (7.5/10). October scores higher but the gap is small.
By trip type
Cook Islands in September by trip type
- 🏙️ 🏙️ City break / culture : ✅ Good
- 🚶 🚶 Outdoor activities : ✅ Good
- 🏖️ Beach / swimming : ⚠️ Possible
- 💰 💰 Budget : 💸 Peak season
Local context
What to expect in September
Autumn in Cook Islands is often underrated: 22°F, golden light and declining crowds. An interesting window. Expect rain on 39% of days — a light raincoat in the bag is recommended. A good balance between weather and crowds, even if October (7.7/10) remains theoretically better.
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Annual table
Month-by-month comparison
| Month | Min °F | Max °F | Rain % | Precip in | Sun h/d | Score |
|---|---|---|---|---|---|---|
| 🌤️ January | 73°F | 77°F | 58% | 0.3in | 12.2h | 7.4/10 |
| ⛅ February | 73°F | 77°F | 65% | 0.3in | 11.9h | 7.3/10 |
| ⛅ March | 73°F | 77°F | 66% | 0.3in | 11.5h | 7.2/10 |
| 🌦️ April | 73°F | 75°F | 51% | 0.2in | 11.0h | 7.4/10 |
| 🌦️ May | 72°F | 75°F | 56% | 0.2in | 10.3h | 7.2/10 |
| 🌤️ June | 70°F | 72°F | 37% | 0.1in | 10.3h | 7.5/10 |
| 🌤️ July | 68°F | 72°F | 43% | 0.1in | 10.2h | 7.4/10 |
| 🌤️ August | 68°F | 72°F | 36% | 0.1in | 10.8h | 7.6/10 |
| 🌤️ September | 68°F | 72°F | 39% | 0.1in | 11.0h | 7.5/10 |
| 🌤️ October | 70°F | 72°F | 37% | 0.1in | 11.7h | 7.7/10 |
| 🌤️ November | 70°F | 72°F | 38% | 0.1in | 12.8h | 7.7/10 |
| 🌦️ December | 72°F | 75°F | 61% | 0.3in | 12.3h | 7.3/10 |
Ideal
Fair
Challenging climate
◀ Current month · Source Open-Meteo · 10 years
📊 Data source
Data based on 10 years of ERA5 records via Open-Meteo, with ECMWF seasonal adjustment. In September, Cook Islands averages 72°F, 39% rainy days and 11.0h of sunshine per day. Overall weather score: 7.5/10.
See methodology →
Comparison
September vs October (best month)
The best month is October (score 7.7/10). Difference:
- 🌡️ Max temperature : +0°F
- 🌧 Rainy days : -2%
- ☀️ Sunshine : +0.7h/day
FAQ
FAQ — Cook Islands in September
Is September a good time to visit Cook Islands?
September is an excellent time to visit Cook Islands (score 7.5/10). With 72°F, 11.0h of sunshine and 39% rain, conditions are very favourable.
What to do in Cook Islands in September?
With 72°F max and 11.0h of sunshine, focus on cultural sites, museums and local gastronomy.
Accommodation
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Activities & tours
Activities and tours in Cook Islands
Guided tours, skip-the-line tickets and local experiences.
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