Tonga · AutumnMonth summary
Tonga weather in September
✅ Good
🌡️ Temperature min / max
21°C – 24°C
🌧 Rainy days
42% of days
☀️ Sunshine
11.0h per day on average
🌊 🌊 Season
Autumn
⭐ ⭐ Weather score
7.7/10
📅 📅 Best month
June (7.8/10)
Quick decision
Should you visit Tonga in September?
✅ Good
✅ Yes if: you want shoulder-season value — fewer crowds, 24°C.
❌ No if: you need maximum sunshine — some overcast days are possible.
Our take: Tonga in September: 24°C and 11.0h of sunshine. Decent, but not the peak.
By trip type
Tonga 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
🎯 Peak season — book ahead for best rates. Accommodation prices at their highest Autumn in Tonga is often underrated: 24°C, golden light and declining crowds. An interesting window. Expect rain on 42% of days — a light raincoat in the bag is recommended. A good balance between weather and crowds, even if June (7.8/10) remains theoretically better.
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All months for Tonga
Annual table
Month-by-month comparison
| Month | Min °C | Max °C | Rain % | Precip mm | Sun h/d | Score |
|---|---|---|---|---|---|---|
| ⛅ January | 25°C | 28°C | 75% | 8.1 | 12.2h | 7.3/10 |
| 🌦️ February | 25°C | 28°C | 86% | 11.1 | 12.0h | 7.1/10 |
| ⛅ March | 25°C | 28°C | 72% | 9.7 | 11.2h | 7.3/10 |
| 🌤️ April | 24°C | 27°C | 53% | 5.6 | 11.0h | 7.6/10 |
| 🌤️ May | 23°C | 25°C | 46% | 5.1 | 10.7h | 7.5/10 |
| 🌤️ June | 22°C | 25°C | 36% | 3.1 | 10.3h | 7.8/10 |
| 🌤️ July | 21°C | 24°C | 34% | 2.9 | 10.3h | 7.7/10 |
| 🌤️ August | 21°C | 23°C | 39% | 3.6 | 10.6h | 7.6/10 |
| 🌤️ September | 21°C | 24°C | 42% | 2.7 | 11.0h | 7.7/10 |
| 🌤️ October | 22°C | 25°C | 51% | 4.7 | 11.5h | 7.5/10 |
| 🌤️ November | 23°C | 26°C | 59% | 4.6 | 12.8h | 7.6/10 |
| ⛅ December | 24°C | 27°C | 65% | 6.4 | 13.0h | 7.5/10 |
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, Tonga averages 24°C, 42% rainy days and 11.0h of sunshine per day. Overall weather score: 7.7/10.
See methodology →
Comparison
September vs June (best month)
The best month is June (score 7.8/10). Difference:
- 🌡️ Max temperature : +1°C
- 🌧 Rainy days : -6%
- ☀️ Sunshine : -0.7h/day
FAQ
FAQ — Tonga in September
Is September a good time to visit Tonga?
September is an excellent time to visit Tonga (score 7.7/10). With 24°C, 11.0h of sunshine and 42% rain, conditions are very favourable.
What to do in Tonga in September?
With 24°C 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 Tonga
Guided tours, skip-the-line tickets and local experiences.
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