January in Koh Lanta — reliably good (3rd best month)
Good · 8.4/10January averages 26°C (79°F) with humidity around 86%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
Rainfall runs 68 mm, so plan one flexible day in three; you still get about 20 sunny days and 11.6 hours of daylight.
It scores 8.4/10 here, 3rd of 12 months, against 8.7/10 in the destination's best month.
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.
February in Koh Lanta — the year's strongest window
Best window · 8.7/10February averages 27°C (80°F) with humidity around 83%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
Rainfall runs 67 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 — the year's strongest window
Best window · 8.7/10March averages 28°C (82°F) with humidity around 78%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
Rainfall runs 72 mm, so plan one flexible day in three; you still get about 29 sunny days and 11.9 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.
April in Koh Lanta — reliably good (4th best month)
Good · 7.8/10April averages 29°C (84°F) with humidity around 78%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
At 116 mm this is a genuinely wet month: about 26 sunny days in total, and outdoor plans need an indoor fallback.
It scores 7.8/10 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 · 6.3/10May averages 29°C (83°F) with humidity around 84%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
233 mm of rain puts this in monsoon territory — about 20 sunny days across the whole month, and multi-day washouts are normal.
It scores 6.3/10 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 — 2.4 points higher on the same scale.
June in Koh Lanta — workable with trade-offs
Trade-offs · 6.4/10June averages 28°C (82°F) with humidity around 85%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
234 mm of rain puts this in monsoon territory — about 21 sunny days across the whole month, and multi-day washouts are normal.
It scores 6.4/10 here, 5th 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 — 2.3 points higher on the same scale.
July in Koh Lanta — workable with trade-offs
Trade-offs · 5.9/10July averages 27°C (81°F) with humidity around 88%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
280 mm of rain puts this in monsoon territory — about 18 sunny days across the whole month, and multi-day washouts are normal.
It scores 5.9/10 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 — 2.8 points higher on the same scale.
August in Koh Lanta — workable with trade-offs
Trade-offs · 6.1/10August averages 27°C (81°F) with humidity around 88%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
353 mm of rain puts this in monsoon territory — about 20 sunny days across the whole month, and multi-day washouts are normal.
It scores 6.1/10 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 — 2.6 points higher on the same scale.
September in Koh Lanta — workable with trade-offs
Trade-offs · 5.6/10September averages 27°C (80°F) with humidity around 87%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
394 mm of rain puts this in monsoon territory — about 16 sunny days across the whole month, and multi-day washouts are normal.
It scores 5.6/10 here, 11th 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 — 3.1 points higher on the same scale.
October in Koh Lanta — workable with trade-offs
Trade-offs · 5.9/10October averages 27°C (80°F) with humidity around 88%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
356 mm of rain puts this in monsoon territory — about 18 sunny days across the whole month, and multi-day washouts are normal.
It scores 5.9/10 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 — 2.8 points higher on the same scale.
November in Koh Lanta — workable with trade-offs
Trade-offs · 5/10November averages 27°C (80°F) with humidity around 90%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
295 mm of rain puts this in monsoon territory — about 11 sunny days across the whole month, and multi-day washouts are normal.
It scores 5/10 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 — 3.7 points higher on the same scale.
December in Koh Lanta — workable with trade-offs
Trade-offs · 5.7/10December averages 26°C (79°F) with humidity around 89%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
At 170 mm this is a genuinely wet month: about 13 sunny days in total, and outdoor plans need an indoor fallback.
It scores 5.7/10 here, 10th 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 — 3 points higher on the same scale.
