Thailand in September 2025
Rainy season - fewer crowds and lower prices. Discover the best destinations, weather outlook, and events happening this month.
Weather in September
Temperature
28°C
Min 24°C / Max 32°C
Rainfall
280mm
19 rainy days
Crowds
Low
Best value
| Region | Temp | Rain | Humidity |
|---|---|---|---|
| Central Thailand | 28°C | 280mm | 82% |
| Northern Thailand | 26°C | 200mm | 83% |
| Southern Thailand | 28°C | 310mm | 83% |
| Isaan (Northeast) | 27°C | 280mm | 82% |
Travel Scores for September
Weather-based scores to help you decide if September is right for your trip type.
Best for sightseeing, temples, and outdoor activities
Best period: Best to avoid monsoon
Best for swimming, sunbathing, and water activities
Best period: November - April (Andaman) / January - September (Gulf)
Humidity
82%
Feel
Muggy
High humidity makes it feel hotter - stay hydrated
Best Beaches in September
Thailand has two distinct coastlines with opposite monsoon patterns. Here's where to go for the best beach conditions.
Southwest monsoon brings large swells and rough seas. Many dive sites closed. Similan Islands closed May-Oct.
Rainfall
320mm
Calm seas and excellent visibility. Perfect for diving, snorkeling, and beach activities.
Rainfall
120mm
Most islands CLOSED during monsoon. Koh Lipe, Similan, Surin, Tarutao all inaccessible.
Rainfall
340mm
- • Similan Islands National Park closed (May 15 - Oct 15)
- • Surin Islands National Park closed (May - Oct)
- • Koh Lipe has limited ferry service (May-Oct) - some resorts close
- • Tarutao National Park closed (May 15 - Nov 15)
- • Koh Tachai remains closed for environmental recovery
- • Maya Bay (Koh Phi Phi) may have restricted access
- • Some Koh Chang & Koh Kood resorts close during low season (Jun-Sep)
Destinations for September 2025
Based on weather conditions, crowd levels, and seasonal events
Top Picks for September
These destinations offer the best weather conditions, activities, and experiences during September. Plan your trip to one of these locations for an optimal Thailand experience.
No top-rated destinations available for this month.
- Lightweight, breathable clothing
- Comfortable walking shoes
- Sunscreen (SPF 30+) and sunglasses
- Reusable water bottle
- Compact umbrella or rain jacket
- Quick-dry clothing
- Waterproof bag for electronics
- Sandals that can get wet
- Book accommodation in advance, especially during holidays
- Rain usually falls in short bursts - wait it out at a cafe
- Great time for spa treatments and cooking classes
- Enjoy significant discounts on accommodation and tours
- Great time for budget travelers - negotiate for better rates
- Enjoy attractions without the crowds
Accommodation
-30%
Best deals of the year
Flights
Low
Good availability
Tours & Activities
Negotiable
Plenty of availability
Frequently Asked Questions about September
Explore Other Months
Ready to Explore Thailand in September?
Check out our destination guides and start planning your trip.