January in Koh Tao — the year's strongest window
Best window · 8.9/10January 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 56 mm, so plan one flexible day in three; you still get about 21 sunny days and 11.5 hours of daylight.
On our climate-comfort scale this is the top-ranked month of the year for Koh Tao at 8.9/10 — 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.
February in Koh Tao — reliably good (4th best month)
Good · 7.6/10February averages 28°C (82°F) with humidity around 80%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
At 113 mm this is a genuinely wet month: about 20 sunny days in total, and outdoor plans need an indoor fallback.
It scores 7.6/10 here, 4th of 12 months, against 9.2/10 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, March is materially better in Koh Tao — 1.6 points higher on the same scale.
March in Koh Tao — the year's strongest window
Best window · 9.2/10March 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 53 mm, so plan one flexible day in three; you still get about 28 sunny days and 11.9 hours of daylight.
On our climate-comfort scale this is the top-ranked month of the year for Koh Tao at 9.2/10 — 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 Tao — reliably good (3rd best month)
Good · 8.4/10April averages 30°C (85°F) with humidity around 76%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
Rainfall runs 91 mm, so plan one flexible day in three; you still get about 27 sunny days and 12.2 hours of daylight.
It scores 8.4/10 here, 3rd of 12 months, against 9.2/10 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 packable rain layer.
May in Koh Tao — workable with trade-offs
Trade-offs · 6.6/10May averages 30°C (86°F) with humidity around 78%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
261 mm of rain puts this in monsoon territory — about 21 sunny days across the whole month, and multi-day washouts are normal.
It scores 6.6/10 here, 7th of 12 months, against 9.2/10 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, March is materially better in Koh Tao — 2.6 points higher on the same scale.
June in Koh Tao — workable with trade-offs
Trade-offs · 6.8/10June averages 29°C (85°F) with humidity around 79%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
214 mm of rain puts this in monsoon territory — about 21 sunny days across the whole month, and multi-day washouts are normal.
It scores 6.8/10 here, 5th of 12 months, against 9.2/10 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, March is materially better in Koh Tao — 2.4 points higher on the same scale.
July in Koh Tao — workable with trade-offs
Trade-offs · 5.9/10July averages 29°C (84°F) with humidity around 80%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
350 mm of rain puts this in monsoon territory — about 16 sunny days across the whole month, and multi-day washouts are normal.
It scores 5.9/10 here, 9th of 12 months, against 9.2/10 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, March is materially better in Koh Tao — 3.3 points higher on the same scale.
August in Koh Tao — workable with trade-offs
Trade-offs · 6.8/10August averages 29°C (84°F) with humidity around 81%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
217 mm of rain puts this in monsoon territory — about 23 sunny days across the whole month, and multi-day washouts are normal.
It scores 6.8/10 here, 6th of 12 months, against 9.2/10 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, March is materially better in Koh Tao — 2.4 points higher on the same scale.
September in Koh Tao — workable with trade-offs
Trade-offs · 6/10September averages 29°C (83°F) with humidity around 80%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
265 mm of rain puts this in monsoon territory — about 17 sunny days across the whole month, and multi-day washouts are normal.
It scores 6/10 here, 8th of 12 months, against 9.2/10 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, March is materially better in Koh Tao — 3.2 points higher on the same scale.
October in Koh Tao — workable with trade-offs
Trade-offs · 5.8/10October averages 28°C (83°F) with humidity around 81%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
283 mm of rain puts this in monsoon territory — about 16 sunny days across the whole month, and multi-day washouts are normal.
It scores 5.8/10 here, 10th of 12 months, against 9.2/10 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, March is materially better in Koh Tao — 3.4 points higher on the same scale.
November in Koh Tao — workable with trade-offs
Trade-offs · 5.1/10November averages 28°C (83°F) with humidity around 81%, 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 10 sunny days across the whole month, and multi-day washouts are normal.
It scores 5.1/10 here, 12th of 12 months, against 9.2/10 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, March is materially better in Koh Tao — 4.1 points higher on the same scale.
December in Koh Tao — workable with trade-offs
Trade-offs · 5.8/10December averages 28°C (82°F) with humidity around 78%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
240 mm of rain puts this in monsoon territory — about 15 sunny days across the whole month, and multi-day washouts are normal.
It scores 5.8/10 here, 11th of 12 months, against 9.2/10 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, March is materially better in Koh Tao — 3.4 points higher on the same scale.
