Vietnam Nha Trang Weather in September — Climate Guide
September in Nha Trang is moderate
September is moderate for Nha Trang.
September brings the central Vietnam monsoon to Nha Trang — daily afternoon thunderstorms 14:00-17:00, rainfall jumps to 130mm (vs 60mm in August), and rainy days double to 10. Tourist arrivals drop sharply and hotel rates fall -25-35% from August. Korean tourists pivot to Korean Chuseok (late September) family travel.
4 Islands Tour cancellation rate climbs to 25-35% on rough-sea afternoon days. Hon Mun visibility drops to 8-12m. Vinpearl + Po Nagar + indoor activities all operate normally.
Travel score
Monsoon onset + Mid-Autumn Festival cultural overlay + value window
September Weather at a Glance
September averages 88°F / 31°C highs and 77°F / 25°C lows with 10 rainy days and 130mm rainfall — first true monsoon month. Humidity 82%, UV 10, sea 28°C. Sunshine drops to 7 hours. Felt 93°F / 34°C with humidity. Daily afternoon storms 14:00-17:00 reliable. Sunrise 5:40 AM, sunset 5:55 PM.
September Travel Advice
Pre-book Vinpearl + 4 Islands morning departures only (afternoon tours cancellation-prone). Travel insurance with cancellation coverage essential. Mid-Autumn Festival (Tet Trung Thu, varies mid-September) atmospheric night-market option. Indoor backup plan: I-Resort mud baths, Po Nagar, Old Market. Korean Chuseok adds late-month Korean uptick.
Flying In from Overseas
Monsoon = tourist arrivals drop. Direct flights from Seoul $250-450 (year's low alongside June), Tokyo $300-500, Bangkok $150-300. Korean Chuseok (late September) brief Korean spike. Western shoulder.
September Pricing Trends
Monsoon shoulder pricing: Tran Phu 4-star $70-150/night, Bai Dai luxury $150-300, Vinpearl $350-600. 4 Islands Tour $25-30 when running. Flights from Seoul $250-450. Best value month if you accept rain.
Nha Trang September Weather Stats
Avg High
31°C
Avg Low
25°C
Rainy Days
10
130mm total
Sunshine
7h
Daily avg
Humidity
82%
high
UV Index
10
Very high
Wind
14 km/h
Gusts 30
Sea Temp
28°C
swimming
Crowds
Moderate
At attractions
September Sunrise & Sunset
Air Quality
PM2.5
14 μg/m³
PM10
25 μg/m³
Status
good
Feels-Like Temperature & Wind
Feels like
Daytime
34°C
Nighttime
26°C
Humidity and wind affect how the actual temperature feels.
Wind
14 km/h
Max gust 30 km/h
Activities Recommended for September
September Travel Pros & Cons
Pros
- Hotels -25-35% off summer peak
- Mid-Autumn Festival cultural overlay
- Empty beaches on dry days
Cons
- Monsoon onset (10 rainy days)
- 4 Islands 25-35% cancellation rate
- Hon Mun visibility drops
September Events & Festivals
- Vietnam National Day (Sep 2, national holiday)
- Mid-Autumn Festival (Tet Trung Thu, varies mid-Sept)
- Korean Chuseok (varies, late Sept)
- Monsoon onset
Nha Trang in September — Full Picture
September brings the central Vietnam monsoon to Nha Trang — daily afternoon thunderstorms 14:00-17:00, rainfall jumps to 130mm (vs 60mm in August), and rainy days double to 10. Tourist arrivals drop sharply and hotel rates fall -25-35% from August. Korean tourists pivot to Korean Chuseok (late September) family travel.
4 Islands Tour cancellation rate climbs to 25-35% on rough-sea afternoon days. Hon Mun visibility drops to 8-12m. Vinpearl + Po Nagar + indoor activities all operate normally.
The value play: stay at a luxury Bai Dai resort with strong indoor + pool amenities, accept that some afternoons will be rainy, and use mornings for outdoor activities. Mid-Autumn Festival (Tet Trung Thu, varies mid-September) brings cultural lanterns + dragon dances + atmospheric night markets.
What to Wear & What to Pack
Monsoon onset — quick-dry layered clothes, full waterproof rain jacket, reef-safe sunscreen between storms. DEET insect repellent strong. Multiple changes of clothes.
Packing Checklist
Seasonal Weather Overview
Spring (Mar·Apr·May)
29.7°C
24°C
3.3/mo
Summer (Jun·Jul·Aug)
32°C
25°C
5.3/mo
Autumn (Sep·Oct·Nov)
Current29.7°C
24.3°C
13.3/mo
Winter (Dec·Jan·Feb)
27°C
22.3°C
6.3/mo
Nha Trang Monthly Weather Comparison
| Month | High | Low | Rain | Sun | Humid | UV | Crowd | Price |
|---|---|---|---|---|---|---|---|---|
| January (Best) | 27° | 22° | 4d·30mm | 7h | 80% | 9 | Very busy | Peak |
| February (Best) | 27° | 22° | 2d·15mm | 8h | 78% | 10 | Busy | Shoulder |
| March (Best) | 28° | 23° | 2d·20mm | 8h | 78% | 10 | Busy | Shoulder |
| April (Best) | 30° | 24° | 3d·30mm | 9h | 78% | 11 | Busy | Peak |
| May (Best) | 31° | 25° | 5d·50mm | 9h | 78% | 11 | Very busy | Peak |
| June (Best) | 32° | 25° | 5d·50mm | 10h | 78% | 12 | Busy | Shoulder |
| July (Best) | 32° | 25° | 5d·50mm | 10h | 78% | 12 | Very busy | Peak |
| 32° | 25° | 6d·60mm | 9h | 80% | 11 | Busy | Peak | |
| 31° | 25° | 10d·130mm | 7h | 82% | 10 | Moderate | Shoulder | |
| 30° | 24° | 14d·250mm | 6h | 84% | 9 | Quiet | Low season | |
| 28° | 24° | 16d·320mm | 6h | 84% | 8 | Quiet | Low season | |
| 27° | 23° | 13d·200mm | 6h | 82% | 8 | Very busy | Peak |
View Other Months
Nha Trang September Hotel Picks
Frequently Asked Questions
Is September a good time to visit Nha Trang?
Nha Trang in September is moderate. Tourist crowds are moderate and flight/hotel prices are shoulder.
What's the average temperature in Nha Trang in September?
Nha Trang September averages a high of 31°C and a low of 25°C.
Does it rain much in Nha Trang in September?
Nha Trang September averages 130mm of rainfall over about 10 rainy days.
What should I wear in Nha Trang in September?
Monsoon onset — quick-dry layered clothes, full waterproof rain jacket, reef-safe sunscreen between storms. DEET insect repellent strong. Multiple changes of clothes.
What time are sunrise and sunset in Nha Trang in September?
Nha Trang September sunrise is 05:40 and sunset is 17:55, with 12h 15min of daylight.
What's the air quality like in Nha Trang in September?
Nha Trang September air quality (AQI) averages 40, rated Good. PM2.5 averages 14μg/m³.
What activities are recommended in Nha Trang in September?
In September, Nha Trang is great for Tran Phu morning swim, Vinpearl + Cable Car (year-round), Mud baths (indoor).
Is September peak season in Nha Trang?
Nha Trang September crowds are moderate and prices are shoulder. You can travel relatively comfortably without long queues.
Best Months to Visit Nha Trang
View Other Months
Why you can trust weather guide
Based in Chiang Mai for 8+ years, with 30+ countries visited across Southeast Asia, Japan, and Europe. Every detail in this guide is primary-source verified as of April 2026, with prices auto-refreshed via live exchange rate APIs. This isn't AI-generated boilerplate — it's written from the perspective of someone who has actually been there.