Head to head

Koh Samui or Osaka?

Osaka, narrowly — 58 vs 57 across the year.

It's close — Koh Samui and Osaka trade the lead through the year (57 vs 58 on the Atlas Ranger Score). Koh Samui is the better pick in 5 of 12 months (Jan–Apr and Aug), Osaka in 6 (May–Jul and Sep–Nov). Koh Samui peaks in February (73); Osaka peaks in October (71). The right answer depends entirely on when you go.

Month by month

When to go

Pick a month. The line shows each place's score across the year; the figures below are that month's averages.

Koh Samui Osaka

In October, Osaka is the better bet — 71 vs 45.

Score

High / low

31° / 24°

22° / 14°

Rain

295 mm

110 mm

Sunshine

8.9 h

5 h

Koh Samui: Wet season starts — rainfall more than doubles, beach days unreliable

Osaka: Autumn arrives — best food month, USJ Halloween peak

At a glance

Side by side

Koh Samui Osaka

Timing & weather

Year-round score57/10058/100

Best monthFebruary (73)October (71)

Months it leadsJan–Apr and AugMay–Jul and Sep–Nov

Cheapest monthsOct–NovJan–Feb and Jun

Driest monthFebruary (64mm)January (45mm)

Wettest monthNovember (445mm)June (200mm)

Hottest monthMay (33°C)August (33°C)

Best for

BeachesKoh Samui is the stronger beach tripStronger—

Off-peak monthsKoh Samui has more shoulder and low-season months (9 vs 7), when rates and crowds easeStronger—

Practical

Main airportSamui International Airport (USM)Kansai International Airport (KIX)

CurrencyTHB (Thai Baht)JPY (Japanese Yen)

LanguageThaiJapanese

Time zoneICT (UTC+7)JST (UTC+9, no DST)

ClimateTropical monsoon (Köppen Am)Humid subtropical (Köppen Cfa), coastal-basin

Visa60-day visa exemption for most Western nationalities (extended Jul 2024)Visa-free 90-day entry for ~70 nationalities (US, UK, EU, Australia, etc.)

SafetyLow risk — standard tropical precautions, scooter accidents are the main injury sourceVery low risk — Osaka has slightly higher (but still low) petty crime vs Kyoto/Tokyo

Named storms nearby nowNASA EONET, checked hourly. Not a forecast.None tracked within 1,000kmNone tracked within 1,000km

Your trip

Which should you pick?

PickKoh Samui

Pick Koh Samui if you want beaches, plus easy family travel — it leads in Jan–Apr and Aug and peaks in February (73).

Koh Samui full guide

PickOsaka

Pick Osaka if you want city life and food, plus easy family travel — it leads in May–Jul and Sep–Nov and peaks in October (71).

Osaka full guide

Plan your trip

Hotels, flights and more

Switch between the two. Hotel prices are for a week in each destination's best month.

Book Koh Samui

$$ · First-time visitors, dining variety, the busiest beach

Partner links. Prices and availability are set by the partner. We may earn a commission, at no extra cost to you.

Booking links are affiliate links — they cost you nothing and help fund the Atlas Ranger Score.

Questions

Good to know

Is Koh Samui or Osaka better to visit?

It's almost a dead heat — Koh Samui 57, Osaka 58 on the Atlas Ranger Score, our 0–100 measure of weather, crowds, value, and timing across the year. The lead flips month to month, so the right pick is essentially whenever you're travelling — compare any month with the tool above.

Which has better weather, Koh Samui or Osaka?

They're well matched on weather — both have strong months and weak months. See the month-by-month score chart above for exactly when each is at its best.

When is it cheapest to visit Koh Samui or Osaka?

Koh Samui is cheapest in Oct–Nov; Osaka is cheapest in Jan–Feb and Jun. Those are the low and shoulder months, when hotel rates and crowds ease — usually because the weather is less reliable, so check the month-by-month scores above before you book.

Can I visit both Koh Samui and Osaka in one trip?

Often yes — many travellers pair them. The smart move is to time each leg to its own best months. Check each destination's full guide (linked below) for the month-by-month detail, then sequence your trip so each stop lands in its strong window.