January in Siem Reap — reliably good (2nd best month)
Good · 8/10January averages 26°C (78°F) — warm enough for beach and boat plans, still short of the heat that pushes sightseeing into early morning.
Expect 41 mm of rain — occasional showers rather than washed-out days — alongside about 29 sunny days and 11.4 daylight hours.
It scores 8/10 here, 2nd of 12 months, against 8.4/10 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 light clothing, swimwear and real sun protection.
February in Siem Reap — reliably good (3rd best month)
Good · 7.2/10February averages 27°C (81°F), so the practical pattern is early mornings, a long midday break, and evenings back outside.
Rainfall runs 49 mm, so plan one flexible day in three; you still get about 28 sunny days and 11.7 hours of daylight.
It scores 7.2/10 here, 3rd of 12 months, against 8.4/10 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.
March in Siem Reap — workable with trade-offs
Trade-offs · 6/10March averages 29°C (84°F), so the practical pattern is early mornings, a long midday break, and evenings back outside.
Rainfall runs 69 mm, so plan one flexible day in three; you still get about 31 sunny days and 12.1 hours of daylight.
It scores 6/10 here, 4th of 12 months, against 8.4/10 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.
If your dates are flexible, December is materially better in Siem Reap — 2.4 points higher on the same scale.
April in Siem Reap — the hardest end of the year
Hardest · 4.2/10April averages 30°C (86°F), so the practical pattern is early mornings, a long midday break, and evenings back outside.
At 127 mm this is a genuinely wet month: about 28 sunny days in total, and outdoor plans need an indoor fallback.
It scores 4.2/10 here, 6th of 12 months, against 8.4/10 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, December is materially better in Siem Reap — 4.2 points higher on the same scale.
May in Siem Reap — the hardest end of the year
Hardest · 3/10May averages 29°C (84°F) with humidity around 79%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
278 mm of rain puts this in monsoon territory — about 29 sunny days across the whole month, and multi-day washouts are normal.
It scores 3/10 here, 12th of 12 months, against 8.4/10 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, December is materially better in Siem Reap — 5.4 points higher on the same scale.
June in Siem Reap — the hardest end of the year
Hardest · 3.6/10June averages 28°C (83°F) with humidity around 80%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
At 193 mm this is a genuinely wet month: about 26 sunny days in total, and outdoor plans need an indoor fallback.
It scores 3.6/10 here, 7th of 12 months, against 8.4/10 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, December is materially better in Siem Reap — 4.8 points higher on the same scale.
July in Siem Reap — the hardest end of the year
Hardest · 3.4/10July averages 27°C (81°F) with humidity around 85%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
324 mm of rain puts this in monsoon territory — about 22 sunny days across the whole month, and multi-day washouts are normal.
It scores 3.4/10 here, 9th of 12 months, against 8.4/10 in the destination's best month.
Expect low-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, December is materially better in Siem Reap — 5 points higher on the same scale.
August in Siem Reap — the hardest end of the year
Hardest · 3.3/10August averages 28°C (82°F) with humidity around 84%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
247 mm of rain puts this in monsoon territory — about 26 sunny days across the whole month, and multi-day washouts are normal.
It scores 3.3/10 here, 10th of 12 months, against 8.4/10 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, December is materially better in Siem Reap — 5.1 points higher on the same scale.
September in Siem Reap — the hardest end of the year
Hardest · 3.3/10September averages 27°C (80°F) with humidity around 88%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
393 mm of rain puts this in monsoon territory — about 19 sunny days across the whole month, and multi-day washouts are normal.
It scores 3.3/10 here, 11th of 12 months, against 8.4/10 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, December is materially better in Siem Reap — 5.1 points higher on the same scale.
October in Siem Reap — the hardest end of the year
Hardest · 3.6/10October averages 27°C (80°F) with humidity around 85%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
290 mm of rain puts this in monsoon territory — about 26 sunny days across the whole month, and multi-day washouts are normal.
It scores 3.6/10 here, 8th of 12 months, against 8.4/10 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, December is materially better in Siem Reap — 4.8 points higher on the same scale.
November in Siem Reap — workable with trade-offs
Trade-offs · 5.2/10November averages 27°C (80°F) with humidity around 80%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
At 123 mm this is a genuinely wet month: about 28 sunny days in total, and outdoor plans need an indoor fallback.
It scores 5.2/10 here, 5th of 12 months, against 8.4/10 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, December is materially better in Siem Reap — 3.2 points higher on the same scale.
December in Siem Reap — the year's strongest window
Best window · 8.4/10December averages 25°C (78°F) — warm enough for beach and boat plans, still short of the heat that pushes sightseeing into early morning.
Expect 31 mm of rain — occasional showers rather than washed-out days — alongside about 30 sunny days and 11.4 daylight hours.
On our climate-comfort scale this is the top-ranked month of the year for Siem Reap at 8.4/10 — 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 light clothing, swimwear and real sun protection.
