January in Koh Lanta — reliably good (3rd best month)
Good · 8.1/10January averages 28°C (82°F) with humidity around 81%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
Rainfall runs 87 mm, so plan one flexible day in three; you still get about 20 sunny days and 11.6 hours of daylight.
It scores 8.1/10 here, 3rd of 12 months, against 8.7/10 in the destination's best month.
Expect peak pricing, and crowds are moderate. You are paying the year's highest rates for the year's best conditions — book early or shift a few weeks either side.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a packable rain layer.
February in Koh Lanta — the year's strongest window
Best window · 8.7/10February averages 28°C (83°F) with humidity around 79%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
Rainfall runs 71 mm, so plan one flexible day in three; you still get about 23 sunny days and 11.8 hours of daylight.
On our climate-comfort scale this is the top-ranked month of the year for Koh Lanta at 8.7/10 — the reference point every other month on this page is measured against.
Expect peak pricing, and this is one of the busiest months here. You are paying the year's highest rates for the year's best conditions — book early or shift a few weeks either side.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a packable rain layer.
March in Koh Lanta — reliably good (2nd best month)
Good · 8.4/10March averages 29°C (84°F) with humidity around 77%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
Rainfall runs 87 mm, so plan one flexible day in three; you still get about 29 sunny days and 11.9 hours of daylight.
It scores 8.4/10 here, 2nd of 12 months, against 8.7/10 in the destination's best month.
Expect peak pricing, and crowds are moderate. You are paying the year's highest rates for the year's best conditions — book early or shift a few weeks either side.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a packable rain layer.
April in Koh Lanta — reliably good (4th best month)
Good · 7.9/10April averages 30°C (85°F) with humidity around 77%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
At 121 mm this is a genuinely wet month: about 26 sunny days in total, and outdoor plans need an indoor fallback.
It scores 7.9/10 here, 4th of 12 months, against 8.7/10 in the destination's best month.
Expect mid-season pricing, and crowds are moderate.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a proper rain shell rather than an umbrella.
May in Koh Lanta — workable with trade-offs
Trade-offs · 6.6/10May averages 30°C (86°F) with humidity around 77%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
229 mm of rain puts this in monsoon territory — about 20 sunny days across the whole month, and multi-day washouts are normal.
It scores 6.6/10 here, 6th of 12 months, against 8.7/10 in the destination's best month.
Expect low-season pricing, and crowds are light for this destination. That combination — decent conditions at the lowest rates of the year — is the best value window on this page.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a proper rain shell rather than an umbrella.
If your dates are flexible, February is materially better in Koh Lanta — 2.1 points higher on the same scale.
June in Koh Lanta — reliably good (5th best month)
Good · 7/10June averages 29°C (85°F) with humidity around 78%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
At 184 mm this is a genuinely wet month: about 21 sunny days in total, and outdoor plans need an indoor fallback.
It scores 7/10 here, 5th of 12 months, against 8.7/10 in the destination's best month.
Expect mid-season pricing, and crowds are moderate.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a proper rain shell rather than an umbrella.
If your dates are flexible, February is materially better in Koh Lanta — 1.7 points higher on the same scale.
July in Koh Lanta — workable with trade-offs
Trade-offs · 6.2/10July averages 29°C (84°F) with humidity around 79%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
260 mm of rain puts this in monsoon territory — about 18 sunny days across the whole month, and multi-day washouts are normal.
It scores 6.2/10 here, 8th of 12 months, against 8.7/10 in the destination's best month.
Expect mid-season pricing, and crowds are moderate.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a proper rain shell rather than an umbrella.
If your dates are flexible, February is materially better in Koh Lanta — 2.5 points higher on the same scale.
August in Koh Lanta — workable with trade-offs
Trade-offs · 6.5/10August averages 29°C (84°F) with humidity around 80%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
288 mm of rain puts this in monsoon territory — about 20 sunny days across the whole month, and multi-day washouts are normal.
It scores 6.5/10 here, 7th of 12 months, against 8.7/10 in the destination's best month.
Expect mid-season pricing, and crowds are moderate.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a proper rain shell rather than an umbrella.
If your dates are flexible, February is materially better in Koh Lanta — 2.2 points higher on the same scale.
September in Koh Lanta — workable with trade-offs
Trade-offs · 6/10September averages 29°C (83°F) with humidity around 79%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
357 mm of rain puts this in monsoon territory — about 16 sunny days across the whole month, and multi-day washouts are normal.
It scores 6/10 here, 10th of 12 months, against 8.7/10 in the destination's best month.
Expect low-season pricing, and crowds are light for this destination.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a proper rain shell rather than an umbrella.
If your dates are flexible, February is materially better in Koh Lanta — 2.7 points higher on the same scale.
October in Koh Lanta — workable with trade-offs
Trade-offs · 6.2/10October averages 28°C (83°F) with humidity around 81%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
347 mm of rain puts this in monsoon territory — about 18 sunny days across the whole month, and multi-day washouts are normal.
It scores 6.2/10 here, 9th of 12 months, against 8.7/10 in the destination's best month.
Expect low-season pricing, and crowds are light for this destination.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a proper rain shell rather than an umbrella.
If your dates are flexible, February is materially better in Koh Lanta — 2.5 points higher on the same scale.
November in Koh Lanta — workable with trade-offs
Trade-offs · 5.3/10November averages 28°C (83°F) with humidity around 82%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
310 mm of rain puts this in monsoon territory — about 11 sunny days across the whole month, and multi-day washouts are normal.
It scores 5.3/10 here, 12th of 12 months, against 8.7/10 in the destination's best month.
Expect low-season pricing, and crowds are light for this destination.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a proper rain shell rather than an umbrella.
If your dates are flexible, February is materially better in Koh Lanta — 3.4 points higher on the same scale.
December in Koh Lanta — workable with trade-offs
Trade-offs · 5.8/10December averages 28°C (82°F) with humidity around 82%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
203 mm of rain puts this in monsoon territory — about 13 sunny days across the whole month, and multi-day washouts are normal.
It scores 5.8/10 here, 11th of 12 months, against 8.7/10 in the destination's best month.
Expect mid-season pricing, and crowds are light for this destination.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a proper rain shell rather than an umbrella.
If your dates are flexible, February is materially better in Koh Lanta — 2.9 points higher on the same scale.
