January in Si Phan Don — the year's strongest window
Best window · 9.6/10January averages 25°C (77°F) — warm enough for beach and boat plans, still short of the heat that pushes sightseeing into early morning.
Rain is a non-issue at 10 mm for the month, with about 29 sunny days and 11.4 hours of daylight to work with.
On our climate-comfort scale this is the top-ranked month of the year for Si Phan Don at 9.6/10 — 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 light clothing, swimwear and real sun protection, footwear you can get muddy.
February in Si Phan Don — the year's strongest window
Best window · 9.4/10February averages 27°C (81°F), so the practical pattern is early mornings, a long midday break, and evenings back outside.
Rain is a non-issue at 12 mm for the month, with about 27 sunny days and 11.7 hours of daylight to work with.
On our climate-comfort scale this is the top-ranked month of the year for Si Phan Don at 9.4/10 — 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, footwear you can get muddy.
March in Si Phan Don — the year's strongest window
Best window · 8.8/10March averages 30°C (85°F), so the practical pattern is early mornings, a long midday break, and evenings back outside.
Expect 25 mm of rain — occasional showers rather than washed-out days — alongside about 28 sunny days and 12.1 daylight hours.
On our climate-comfort scale this is the top-ranked month of the year for Si Phan Don at 8.8/10 — the reference point every other month on this page is measured against.
Expect mid-season pricing, and crowds are moderate.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, footwear you can get muddy.
April in Si Phan Don — reliably good (7th best month)
Good · 7.8/10April averages 31°C (87°F), so the practical pattern is early mornings, a long midday break, and evenings back outside.
Rainfall runs 50 mm, so plan one flexible day in three; you still get about 25 sunny days and 12.5 hours of daylight.
It scores 7.8/10 here, 7th of 12 months, against 9.6/10 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, footwear you can get muddy.
If your dates are flexible, January is materially better in Si Phan Don — 1.8 points higher on the same scale.
May in Si Phan Don — workable with trade-offs
Trade-offs · 5.8/10May averages 30°C (85°F) with humidity around 74%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
At 180 mm this is a genuinely wet month: about 18 sunny days in total, and outdoor plans need an indoor fallback.
It scores 5.8/10 here, 8th of 12 months, against 9.6/10 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, footwear you can get muddy.
If your dates are flexible, January is materially better in Si Phan Don — 3.8 points higher on the same scale.
June in Si Phan Don — the hardest end of the year
Hardest · 4.5/10June averages 29°C (83°F) with humidity around 78%, 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 12 sunny days across the whole month, and multi-day washouts are normal.
It scores 4.5/10 here, 10th of 12 months, against 9.6/10 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, footwear you can get muddy.
If your dates are flexible, January is materially better in Si Phan Don — 5.1 points higher on the same scale.
July in Si Phan Don — the hardest end of the year
Hardest · 3.8/10July averages 28°C (82°F) with humidity around 81%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
320 mm of rain puts this in monsoon territory — about 10 sunny days across the whole month, and multi-day washouts are normal.
It scores 3.8/10 here, 11th of 12 months, against 9.6/10 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, footwear you can get muddy.
If your dates are flexible, January is materially better in Si Phan Don — 5.8 points higher on the same scale.
August in Si Phan Don — the hardest end of the year
Hardest · 3.5/10August averages 28°C (82°F) with humidity around 82%, 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 9 sunny days across the whole month, and multi-day washouts are normal.
It scores 3.5/10 here, 12th of 12 months, against 9.6/10 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, footwear you can get muddy.
If your dates are flexible, January is materially better in Si Phan Don — 6.1 points higher on the same scale.
September in Si Phan Don — workable with trade-offs
Trade-offs · 5.2/10September averages 27°C (81°F) with humidity around 80%, 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 14 sunny days across the whole month, and multi-day washouts are normal.
It scores 5.2/10 here, 9th of 12 months, against 9.6/10 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, footwear you can get muddy.
If your dates are flexible, January is materially better in Si Phan Don — 4.4 points higher on the same scale.
October in Si Phan Don — reliably good (6th best month)
Good · 7.9/10October averages 27°C (80°F) with humidity around 74%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
At 130 mm this is a genuinely wet month: about 23 sunny days in total, and outdoor plans need an indoor fallback.
It scores 7.9/10 here, 6th of 12 months, against 9.6/10 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, footwear you can get muddy.
If your dates are flexible, January is materially better in Si Phan Don — 1.7 points higher on the same scale.
November in Si Phan Don — the year's strongest window
Best window · 9.1/10November averages 26°C (78°F) — warm enough for beach and boat plans, still short of the heat that pushes sightseeing into early morning.
Expect 40 mm of rain — occasional showers rather than washed-out days — alongside about 28 sunny days and 11.4 daylight hours.
On our climate-comfort scale this is the top-ranked month of the year for Si Phan Don at 9.1/10 — the reference point every other month on this page is measured against.
Expect mid-season pricing, and this is one of the busiest months here.
Pack light clothing, swimwear and real sun protection, footwear you can get muddy.
December in Si Phan Don — the year's strongest window
Best window · 9.5/10December averages 25°C (76°F) — warm enough for beach and boat plans, still short of the heat that pushes sightseeing into early morning.
Expect 15 mm of rain — occasional showers rather than washed-out days — alongside about 29 sunny days and 11.3 daylight hours.
On our climate-comfort scale this is the top-ranked month of the year for Si Phan Don at 9.5/10 — 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 light clothing, swimwear and real sun protection, footwear you can get muddy.
