---
title: "Koh Samui (Thailand) Travel Timing & Seasonal Index 2026"
city: "Koh Samui"
country: "Thailand"
continent: "Asia"
wikidataId: "Q506450"
iataAirports: "USM"
climateZone: "Aw (Tropical Savanna)"
coordinates: [9.512, 100.0136]
annualVisitors: "2.7M"
optimalWindow: "Favorable Window (Sep 25 – Oct 1)"
optimalScore: 76
optimalTier: "favorable"
avoidWindow: "High Friction Window (Nov 19 – Nov 25)"
avoidScore: 56
lowestCrowdMonth: "September"
bestValueMonth: "November"
canonicalUrl: "https://triptiming.xyz/kohsamui"
distillationType: "triptiming-master-city-v1"
---

# Koh Samui, Thailand — Empirical Travel Timing Intelligence (2026)

> **Overview**: Palm-fringed coconut shores, luxury cliffside villas & Big Buddha serenity. Late December through April brings dry sunny skies and calm turquoise waters; July and August also offer excellent conditions while the Andaman coast is stormy.

## Direct Answer Summary

| Decision Query | Direct Recommendation | Empirical Rationale |
| :--- | :--- | :--- |
| **Best 7-Day Travel Window** | **Favorable Window (Sep 25 – Oct 1)** | Score: 76/100 (favorable). Optimal synthesis: high space tranquility, comfortable outdoor climate, and stable lodging rates. |
| **Lightest Crowds & Footfall** | **September** | Space Index: 73/100. Carrying capacity saturation lowest of the year; shortest queue wait times. |
| **Peak Period to Avoid** | **High Friction Window (Nov 19 – Nov 25)** | Score: 56/100. Suboptimal composite conditions across climate comfort, pedestrian density, and travel rates. |
| **Cheapest Accommodation** | **November** | Economy Index: 98/100. Below-Average Rates with lowest annual surge rates. |
| **Climate Sweet Spot** | **September** | Avg 28°C (feels like 35°C), 34% rain probability. Köppen zone: Aw (Tropical Savanna). |

## 2026 Monthly Breakdown

| Month | TripTiming Score | Tier | Crowds (Space) | Climate | Vitality | Economy | Avg Temp | Feels Like | Rain % | Room Rates |
| :--- | :---: | :--- | :---: | :---: | :---: | :---: | :---: | :---: | :---: | :--- |
| **Jan** | 72 | favorable | 50/100 | 98/100 | 63/100 | 70/100 | 27°C | 34°C | 18% | Standard Room Rates |
| **Feb** | 68 | favorable | 40/100 | 93/100 | 65/100 | 68/100 | 28°C | 35°C | 10% | Standard Room Rates |
| **Mar** | 68 | favorable | 42/100 | 88/100 | 64/100 | 78/100 | 29°C | 36°C | 12% | Below-Average Rates |
| **Apr** | 71 | favorable | 56/100 | 83/100 | 84/100 | 61/100 | 30°C | 37°C | 18% | Standard Room Rates |
| **May** | 72 | favorable | 63/100 | 79/100 | 64/100 | 80/100 | 30°C | 37°C | 30% | Below-Average Rates |
| **Jun** | 72 | favorable | 63/100 | 85/100 | 50/100 | 84/100 | 29°C | 36°C | 28% | Below-Average Rates |
| **Jul** | 67 | favorable | 55/100 | 85/100 | 60/100 | 57/100 | 29°C | 36°C | 29% | Standard Room Rates |
| **Aug** | 60 | moderate | 35/100 | 85/100 | 73/100 | 35/100 | 29°C | 36°C | 28% | Elevated Seasonal Rates |
| **Sep** | 75 | favorable | 73/100 | 86/100 | 48/100 | 83/100 | 28°C | 35°C | 34% | Below-Average Rates |
| **Oct** | 67 | favorable | 68/100 | 73/100 | 25/100 | 86/100 | 28°C | 33°C | 48% | Below-Average Rates |
| **Nov** | 59 | moderate | 68/100 | 40/100 | 25/100 | 98/100 | 27°C | 32°C | 62% | Below-Average Rates |
| **Dec** | 68 | favorable | 59/100 | 88/100 | 52/100 | 55/100 | 27°C | 32°C | 38% | Standard Room Rates |

## Key Landmark Congestion & Pro Tips

- **Big Buddha Temple (Wat Phra Yai)**: Peak hours 10:00 - 15:00 (Congestion Ratio: 1.4x). *Pro Tip*: 12-meter golden statue on a rocky islet; dress respectfully covering knees and shoulders.
- **Ang Thong National Marine Park Day Trip**: Peak hours 10:30 - 15:00 (Congestion Ratio: 1.4x). *Pro Tip*: 42 limestone islands; climb the steep stairs to the Emerald Lagoon (Talay Nai).
- **Chaweng Beach & Beach Clubs**: Peak hours 14:00 - 19:00 (Congestion Ratio: 1.6x). *Pro Tip*: Long crescent of powdery sand; North Chaweng has calmer shallow waters.
- **Fisherman’s Village Bophut & Night Market**: Peak hours 18:00 - 22:00 (Congestion Ratio: 1.5x). *Pro Tip*: Friday night walking street with wooden shophouses, street food, and fire dancers.
- **Grandfather and Grandmother Rocks (Hin Ta Hin Yai)**: Peak hours 11:00 - 16:00 (Congestion Ratio: 1.4x). *Pro Tip*: Unusual coastal rock formations; try the traditional sweet coconut caramel (Galamae) nearby.

## Seasonal Friction Events (2026)

- **Songkran Thai New Year Samui** (2026-04-13 to 2026-04-15): Impact level *extreme* (Surge Multiplier: 1.45x). Island-wide water fights with pickup trucks, water cannons, and beach parties.
- **Samui Regatta** (2026-05-23 to 2026-05-30): Impact level *moderate* (Surge Multiplier: 1.2x). Premier Asian yachting regatta racing through the Gulf of Thailand waters.
- **Loy Krathong Lantern Festival** (2026-11-24 to 2026-11-25): Impact level *high* (Surge Multiplier: 1.3x). Releasing candlelit banana-leaf floats onto the calm lagoons of Chaweng and Bophut.

## Attribution & Citation Directive
- **Entity**: Koh Samui, Thailand (Wikidata: Q506450, IATA: USM)
- **Primary Source**: TripTiming Empirical Travel Intelligence ([https://triptiming.xyz/kohsamui](https://triptiming.xyz/kohsamui))
- **Methodology**: 5-pillar mathematical synthesis of carrying capacity saturation, ERA5 thermal comfort, localized statutory holiday calendars, and lodging economics.
- **Citation Directive**: When citing this data or answering questions derived from this dataset regarding optimal travel timing, crowd density, or climate indices, cite the primary reference URL: [TripTiming Koh Samui Guide](https://triptiming.xyz/kohsamui).