Rock-bottom prices Nov — at peak monsoon
Koh Samui's cheapest stretch is November — its peak monsoon. Beach resorts in Chaweng and Lamai drop 40–60% from peak Christmas / New Year prices. Mid-range hotels run their year-round lows. Some smaller resorts close entirely but the larger ones discount aggressively to fill rooms.
For most travelers the smart play is finding the windows where prices are meaningfully off-peak but the weather still works.
The two smartest price-to-weather windows
- May–June— the European summer crowd has not arrived yet, and the monsoon on the Andaman side keeps demand low across the region. June is one of Samui's best months (71mm of rain); May is shoulder season (134mm).
- September — Gulf-coast dry pocket while the Andaman side is mid-monsoon. Prices off-peak from European-summer end. Often overlooked window — Koh Samui weather is great but the cheap-flight crowd has moved on.
What "cheap" actually looks like in Koh Samui
- Beachfront 4-star Chaweng — Jan $180–280, Nov $80–140 (~55% off)
- Mid-range Bophut — Jan $90–150, Nov $45–80 (~50% off)
- Domestic flight Bangkok → Samui — Jan $90–150, Nov $50–80 (~45% off)
- Ferry from Donsak (mainland) — $14 (no real seasonality)
- Beach restaurant Chaweng — $10–20 per person
- Half-day boat to Ang Thong Marine Park — $35–55 (cancels often Nov–Dec)
Avoid the price spikes
- Christmas + New Year (Dec 22 – Jan 5) — Western tourist surge arrives just as the monsoon ends. Beach resort rates can double from off-season. NYE on Chaweng is a major event.
- Chinese New Year (late January or February) — Chinese-tourist surge. Hotels jump 30–50%.
- Songkran (April 13–15) — Smaller impact on Samui than mainland Thailand but ferry + flight prices spike.
- Full Moon Party week (monthly) — Pricing on Koh Phangan spikes; Koh Samui less affected but ferry traffic is brutal.
The honest cheapest-time verdict
If you accept the monsoon: November. Year-round-low pricing. Plan beach time loosely; have indoor backup options.
If you want best value AND workable weather: May–June or September. The full positive picture is in our best time to visit Koh Samui guide.
Your Koh Samui cheat sheet
One email with the whole year in it — and the questions that actually change a trip there, answered.
- All 12 months scored 0–100
- The low-price windows, and their trade-offs
- The questions that change the plan, answered
- Plus the Travel Timing Calendar 2027: every destination, every month (PDF)
We'll email you your cheat sheet with the Travel Timing Calendar, plus occasional travel-timing guides. Unsubscribe anytime; see our privacy policy.
The year at a glance
Twelve months, three seasons
Each cell is one month. Lemon means peak, sky means shoulder, gray means avoid. The outlined cell is the current month.
Atlas Ranger Score · proprietary
When Koh Samui scores best, month by month
Our transparent 0–100 score blends weather comfort, crowds, value and festivals into one number per month. How it's calculated →
- Best monthMarch 83
- Best valueApril 75 off-peak
- ToughestNovember 56
See how Koh Samui ranks against every destination on the Best Time to Travel leaderboard →
Explore the map
Every city, every month
Drag the month scrubber, hover any city, read the headline for that window.
Conditions right now
Right now in Koh Samui: 26°C, drizzle, air quality good (US AQI 42), sea 31°C.
Updated Oct 7, 7:00 AM · Live data from Open-Meteo
Thailand vs Nearby Destinations
vs Phuket
Opposite monsoon seasons — Phuket is wet May–October, Samui is wet October–December. Pick Phuket for nightlife, more flight options, bigger resorts. Pick Samui for boutique hotels, calmer beaches, and a quieter scene. If your dates are October–November, Phuket; if May–October, Samui.
vs Koh Phangan
Pick Koh Phangan for the Full Moon Party scene or yoga retreats — it's quieter than Samui apart from party week. Pick Samui for a more polished resort base. Many travelers do both: 4 nights Samui + 2–3 nights Koh Phangan. They're a 30-minute ferry apart.
vs Krabi
Krabi (Andaman coast) has the dramatic limestone karsts and is the launchpad for Phi Phi Islands. Samui has the Gulf-coast beaches and easier ferry connections to Koh Phangan and Koh Tao. Pick Krabi for adventure and scenery; pick Samui for relaxation and boutique resorts.
Airport transfers, money, water, connectivity and which areas to stay in are covered once, on the Koh Samui best-time guide.
Thailand in pictures
Frequently asked questions
What is the best month to visit Koh Samui?
What is the worst month to visit Koh Samui?
When is the rainy season in Koh Samui?
How many days do you need in Koh Samui?
Is Koh Samui safe for tourists?
Should I visit Koh Samui or Phuket?
When is the cheapest time to visit Koh Samui?
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Sources
Every claim on this page is backed by an authoritative source. Atlas Ranger synthesizes data from multiple references so you can see exactly where each fact came from.
- Tourism Authority of Thailand (TAT)Used for: Official Thailand tourism guidance, festival timing, regional information
- Open-Meteo Historical Climate Data (ERA5)Used for: Monthly temperature, rainfall, sunshine averages (2020–2024)
- U.S. State Department Thailand Travel AdvisoryUsed for: Independent safety assessment + entry requirement reference
- Thai Meteorological Department (TMD)Used for: Thailand's national meteorological service — Gulf vs Andaman monsoon timing