Thailand Phuket Weather in September — Climate Guide
September in Phuket is moderate
September is moderate for Phuket.
September is statistically Phuket's wettest month (270mm, 18 rainy days) and lowest tourist arrival period. Hotel pricing back to year's lowest (Patong 4-star $40-100/night). Phi Phi cancellation rate hits 40-50%. Many smaller dive operators close September entirely.
This is the canonical 'risk it for value' month — if you accept that 30-50% of outdoor plans will get rained out and you'll spend more time at the hotel pool, you get luxury resorts at 50% of peak pricing and near-empty restaurants + spas. Honeymoon couples staying at all-inclusive Trisara / Amanpuri / Six Senses Yao Noi mostly notice the rain only during sunset photography.
Travel score
Wettest month + year's lowest pricing — risk it for value
September Weather at a Glance
September averages 88°F / 31°C highs and 75°F / 24°C lows with 18 rainy days and 270mm rainfall — wettest month of the year. Humidity 82%. UV 10. Sunshine 6 hours. Sea 28°C but most dangerous of year (red flags persistent). Daily storms heavier + frequent 3-5 day rain stretches.
September Travel Advice
Travel insurance with cancellation coverage absolutely essential. Phi Phi reservation = expect 40-50% chance of cancellation. Phang Nga Bay better odds. Luxury resort all-inclusive booking = best strategy. Chuseok (varies, mid-September) Korean travelers can find value if accepting rain.
Flying In from Overseas
Year's lowest tourist arrivals = year's lowest international flight pricing. Direct flights from Seoul $250-400, Tokyo $250-400, Sydney $350-500. Chuseok (Korean Thanksgiving, varies mid-Sept) adds brief Korean uptick. Western shoulder before October recovery.
September Pricing Trends
Year's lowest pricing returns: Patong 4-star $40-90/night, Karon family $60-130, Trisara luxury $500-1,400. Phi Phi day tour $50-75. Flights from Seoul $250-400.
Phuket September Weather Stats
Avg High
31°C
Avg Low
24°C
Rainy Days
18
270mm total
Sunshine
6h
Daily avg
Humidity
82%
high
UV Index
10
Very high
Wind
16 km/h
Gusts 35
Sea Temp
28°C
dangerous
Crowds
Moderate
At attractions
September Sunrise & Sunset
Air Quality
PM2.5
10 μg/m³
PM10
20 μg/m³
Status
good
Feels-Like Temperature & Wind
Feels like
Daytime
36°C
Nighttime
26°C
Humidity and wind affect how the actual temperature feels.
Wind
16 km/h
Max gust 35 km/h
Activities Recommended for September
September Travel Pros & Cons
Pros
- Hotels 50% off peak
- Near-empty restaurants + spas
- Luxury resort bargains
- Chuseok overlap for Korean travelers
Cons
- Wettest month of year
- Phi Phi 40-50% cancellations
- Many dive ops close
- Sea most dangerous
September Events & Festivals
- Wettest month of year
- Lowest tourist arrivals
- Chuseok / Korean Thanksgiving (varies, mid-Sept)
Phuket in September — Full Picture
September is statistically Phuket's wettest month (270mm, 18 rainy days) and lowest tourist arrival period. Hotel pricing back to year's lowest (Patong 4-star $40-100/night). Phi Phi cancellation rate hits 40-50%. Many smaller dive operators close September entirely.
This is the canonical 'risk it for value' month — if you accept that 30-50% of outdoor plans will get rained out and you'll spend more time at the hotel pool, you get luxury resorts at 50% of peak pricing and near-empty restaurants + spas. Honeymoon couples staying at all-inclusive Trisara / Amanpuri / Six Senses Yao Noi mostly notice the rain only during sunset photography.
For day-trippers and active travelers: skip September. For pool + spa + dining + cultural Phuket: this is the bargain month.
What to Wear & What to Pack
Wettest month — fully waterproof gear. Quick-dry inner layer. Multiple changes of clothes.
Packing Checklist
Seasonal Weather Overview
Spring (Mar·Apr·May)
33°C
25.3°C
10/mo
Summer (Jun·Jul·Aug)
31°C
25°C
16/mo
Autumn (Sep·Oct·Nov)
Current31°C
24°C
16.3/mo
Winter (Dec·Jan·Feb)
32°C
24°C
4/mo
Phuket Monthly Weather Comparison
| Month | High | Low | Rain | Sun | Humid | UV | Crowd | Price |
|---|---|---|---|---|---|---|---|---|
| January (Best) | 32° | 24° | 3d·30mm | 9h | 73% | 10 | Very busy | Peak |
| February (Best) | 33° | 25° | 2d·20mm | 9h | 72% | 10 | Very busy | Peak |
| March (Best) | 33° | 25° | 5d·50mm | 9h | 73% | 11 | Busy | Peak |
| 34° | 26° | 9d·100mm | 9h | 75% | 11 | Busy | Peak | |
| 32° | 25° | 16d·230mm | 7h | 80% | 11 | Moderate | Shoulder | |
| 31° | 25° | 15d·220mm | 7h | 80% | 10 | Moderate | Low season | |
| 31° | 25° | 16d·230mm | 6h | 80% | 10 | Busy | Shoulder | |
| 31° | 25° | 17d·240mm | 6h | 80% | 10 | Busy | Shoulder | |
| 31° | 24° | 18d·270mm | 6h | 82% | 10 | Moderate | Low season | |
| 31° | 24° | 18d·280mm | 6h | 80% | 10 | Moderate | Low season | |
| 31° | 24° | 13d·180mm | 7h | 78% | 9 | Busy | Shoulder | |
| December (Best) | 31° | 23° | 7d·80mm | 8h | 75% | 9 | Very busy | Peak |
View Other Months
Phuket September Hotel Picks
Frequently Asked Questions
Is September a good time to visit Phuket?
Phuket in September is moderate. Tourist crowds are moderate and flight/hotel prices are low season.
What's the average temperature in Phuket in September?
Phuket September averages a high of 31°C and a low of 24°C.
Does it rain much in Phuket in September?
Phuket September averages 270mm of rainfall over about 18 rainy days.
What should I wear in Phuket in September?
Wettest month — fully waterproof gear. Quick-dry inner layer. Multiple changes of clothes.
What time are sunrise and sunset in Phuket in September?
Phuket September sunrise is 06:25 and sunset is 18:20, with 11h 55min of daylight.
What's the air quality like in Phuket in September?
Phuket September air quality (AQI) averages 32, rated Good. PM2.5 averages 10μg/m³.
What activities are recommended in Phuket in September?
In September, Phuket is great for Luxury resort stays, Spa days, Old Phuket Town indoor.
Is September peak season in Phuket?
Phuket September crowds are moderate and prices are low season. You can travel relatively comfortably without long queues.
Best Months to Visit Phuket
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.