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Thailand · Southeast Asia
Best time to visit Koh Samui
April
Apr scores highest overall — reliable weather and strong local atmosphere. Set your priorities below to personalise this result.
What matters most to you?
All 12 months — click any to expand
Apr
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Songkran brings Thai New Year festivities — warm, slightly wetter, but culturally unmissable.
32.8°C
High
24.4°C
Low
83mm
Rain
7.5h
Sun/day
What you gain
- ↑Songkran water festival (13–15 April) transforms Na Thon and Chaweng into celebrations of Thai New Year
- ↑Good value accommodation: 30–35% below peak-season rates with weather still mostly excellent
- ↑Ang Thong Marine Park day trips still fully operating with calm seas in the first half of the month
What you sacrifice
- ↓Songkran week: hotel prices spike temporarily and transport books up fast
- ↓83mm of rain is manageable but occasional heavy afternoon showers begin appearing
- ↓Peak heat of 32.8°C: demanding for any strenuous outdoor activity between 11am and 3pm
Apr scores highest overall — reliable weather and strong local atmosphere. Set your priorities below to personalise this result.
Apr
Songkran brings Thai New Year festivities — warm, slightly wetter, but culturally unmissable.
32.8°C
High
83mm
Rain
7.5h
Sun
- ↑Songkran water festival (13–15 April) transforms Na Thon and Chaweng into celebrations of Thai New Year
- ↑Good value accommodation: 30–35% below peak-season rates with weather still mostly excellent
- ↑Ang Thong Marine Park day trips still fully operating with calm seas in the first half of the month
- ↓Songkran week: hotel prices spike temporarily and transport books up fast
- ↓83mm of rain is manageable but occasional heavy afternoon showers begin appearing
- ↓Peak heat of 32.8°C: demanding for any strenuous outdoor activity between 11am and 3pm
Top travel windows
★ BestApril
Best overall
Highest combined score
32.8°C
High
83mm
Rain
7.5h
Sun
October
Best for value
Lowest prices & fees
29.5°C
High
305mm
Rain
4.2h
Sun
October
Fewest crowds
Quietest month
29.5°C
High
305mm
Rain
4.2h
Sun
Breakdown by priority
Best for weather
February
30.1°C high · 42mm rain · 8.2hrs sun/day
Best for budget
October
Rock-bottom prices: luxury villas at budget rates, resorts negotiable for longer stays
Fewest crowds
October
Virtually no tourists: the island strips back to its Thai fishing-community character
Worst time to visit
October, November
305mm of rain is not occasional showers — sustained tropical downpours make outdoor plans impossible
Where to stay in Koh Samui
All neighbourhoods →
Chaweng Beach
The island's main tourist strip — a 6km curve of white sand backed by hotels, bars, and restaurants.
9/10
Central
7/10
Walk
6/10
Transit
Na Thon & West Coast
The island's administrative capital — a working Thai port town that is the most authentically local part of Koh Samui.
3/10
Central
7/10
Walk
5/10
Transit
Also exploring
Tokyo
Japan
A city of dramatic seasonal contrasts — cherry blossom crowds, oppressive summer humidity, and golden autumn foliage — where the wrong timing can make or break the trip.
Bali
Indonesia
A Hindu island of rice terraces, temple ceremonies, and surf breaks where the monsoon makes timing genuinely binary — the difference between dry and wet season is not subtle.
Maldives
Maldives
A destination defined almost entirely by its monsoon calendar — the difference between the NE dry season (November–April) and SW wet season (May–October) is not subtle and shapes every aspect of the experience.
Worth knowing
April scores highest overall. January is the most crowded month — avoid if you can. See crowd-free ranking →
Month by month breakdown
January#5▾
Gains
- ↑Consistent sunshine with only 58mm of rain spread across the month — outdoor days rarely disrupted
- ↑Sea conditions ideal for snorkelling at Ang Thong Marine Park and Koh Tao day trips
- ↑Bo Phut Fisherman's Village night market fully operational with excellent atmosphere
Sacrifices
- ↓Peak prices: resort rates 40–60% above low-season levels, with beachfront villas selling out months ahead
- ↓Chaweng Beach strip at maximum tourist density — sunbed space genuinely competitive
- ↓Flight connections from Bangkok and Singapore fill quickly; book transport well in advance
February#3▾
Gains
- ↑Statistically the least rainfall of any month — the most reliable weather window on the island
- ↑Slightly fewer visitors than January as European half-term crowds thin after early February
- ↑Ideal conditions for full-day sailing and snorkelling charters around the Ang Thong archipelago
Sacrifices
- ↓Still peak season pricing across accommodation, tours, and restaurants
- ↓Chinese New Year week brings additional visitors from Singapore and Malaysia
- ↓Coral bleaching risk at some dive sites due to warm, calm water conditions
March#2▾
Gains
- ↑European winter crowds departing sharply — Chaweng feels genuinely spacious by mid-March
- ↑Prices dropping 15–25% from January–February peak while weather remains excellent
- ↑Sonkran preparations in Na Thon give a glimpse of Thai festival culture approaching in April
Sacrifices
- ↓Heat beginning to build: 31.5°C highs require midday shade and regular hydration
- ↓Some afternoon humidity and occasional brief showers appearing from late March
- ↓Dive visibility can reduce slightly with the change in current patterns
April#1▾
Gains
- ↑Songkran water festival (13–15 April) transforms Na Thon and Chaweng into celebrations of Thai New Year
- ↑Good value accommodation: 30–35% below peak-season rates with weather still mostly excellent
- ↑Ang Thong Marine Park day trips still fully operating with calm seas in the first half of the month
Sacrifices
- ↓Songkran week: hotel prices spike temporarily and transport books up fast
- ↓83mm of rain is manageable but occasional heavy afternoon showers begin appearing
- ↓Peak heat of 32.8°C: demanding for any strenuous outdoor activity between 11am and 3pm
May#4▾
Gains
- ↑Lowest prices since November — excellent value for budget-conscious travellers
- ↑Beaches almost empty by Koh Samui standards; Lamai and Mae Nam feel genuinely serene
- ↑Lush green jungle interior at its most beautiful; waterfall hikes at Hin Lad and Na Muang excellent
Sacrifices
- ↓147mm of rain with increasingly heavy and frequent afternoon downpours
- ↓Sea conditions becoming choppy on east-facing beaches; swimming less reliably pleasant
- ↓Some smaller tour operators reduce schedules and charter boats assess conditions daily
June#6▾
Gains
- ↑Prices remain 30–40% below high season — genuine value at quality resorts
- ↑Rain typically falls in afternoon bursts; mornings are often clear for beach time
- ↑No crowds anywhere on the island: Chaweng Beach feels like a different place entirely
Sacrifices
- ↓112mm of rain with afternoon reliability — afternoon activities need contingency plans
- ↓Some Ang Thong Marine Park tours cancelled on heavier rain days
- ↓High humidity makes outdoor sightseeing sticky and draining without breaks
July#7▾
Gains
- ↑Rain drops dramatically from June — one of the drier months outside the Jan–Apr window
- ↑Sunshine hours rise again: good beach weather most days with manageable humidity
- ↑Full resort services and water sports operations running at capacity
Sacrifices
- ↓European summer school holiday surge: prices spike to near-January levels
- ↓Chaweng Beach at capacity again — booking 2–3 months ahead for decent mid-range options
- ↓Occasional heavy rain still possible; the weather is better than May–June but not as reliable as January
August#8▾
Gains
- ↑Weather remains good: mostly sunny mornings, afternoon showers shorter than in June
- ↑Best month for diving on the east side; visibility at Sail Rock and the Anthong wrecks excellent
- ↑Full moon party atmosphere at Ko Pha-ngan — a short ferry ride for those who want it
Sacrifices
- ↓Accommodation prices at peak across the island — sold out at many quality properties
- ↓August can be slightly wetter than July; weather not as consistent as Feb–Apr
- ↓Koh Tao day trips massively in demand; book boats well in advance
September#9▾
Gains
- ↑Prices drop sharply from August peak: genuinely excellent value at resort-quality properties
- ↑Island almost entirely to yourself — a radically different, more local experience
- ↑Interior jungle waterfalls at Na Muang reach peak flow: dramatic and accessible
Sacrifices
- ↓185mm of rain — heavy and sustained, not just afternoon showers; full days can be lost
- ↓Sea getting choppy: some beach swimming unpleasant on rougher days
- ↓Some operators reduce tour schedules and watersports become unreliable
October#10▾
Gains
- ↑Rock-bottom prices: luxury villas at budget rates, resorts negotiable for longer stays
- ↑Virtually no tourists: the island strips back to its Thai fishing-community character
- ↑An honest, local experience of Koh Samui completely unlike the high-season version
Sacrifices
- ↓305mm of rain is not occasional showers — sustained tropical downpours make outdoor plans impossible
- ↓Some resorts partially close for renovation; reduced services across the island
- ↓Flooding risk on lower roads around Chaweng and Na Thon after heavy rainfall events
November#11▾
Gains
- ↑Cheapest month of the year: extraordinary deals available for those who don't mind rain
- ↑Loy Krathong (floating lanterns) festival if it falls in November — a beautiful cultural experience
- ↑The island's temples, markets, and local life undisturbed by any tourist presence
Sacrifices
- ↓290mm of rain — similar to October; days of persistent heavy rainfall are the norm
- ↓Many resorts close entirely in November for annual maintenance; choice is severely reduced
- ↓Rough seas make most island-hopping and snorkelling trips impossible for much of the month
December#12▾
Gains
- ↑Rain decreasing notably through December — the second half of the month is significantly drier than the first
- ↑Christmas and New Year celebrations at beach clubs and resorts are atmospheric and well-organised
- ↑Resorts that closed in November reopen fully; full island services restored
Sacrifices
- ↓158mm of rain makes the first two weeks of December still risky for a beach-focused holiday
- ↓Christmas week prices spike significantly — paying January rates for weather that is still improving
- ↓The value proposition only works if arriving in the last week of December or later
How this is calculated
Climate data
Open Meteo ERA5
30-year normals (1991–2020). Temperature, rainfall, sunshine, humidity.
Price & crowd
Tourism research
Seasonal pricing from tourism authority data. Directional — compares months within a destination only.
Personalisation
Weighted scoring
Your priorities change the weights. Budget-first users get different results than weather-first users.
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April is the best time to visit Koh Samui
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