January holds up well in Siem Reap — 2nd best month
Good · 8/10January averages 26°C (78°F) — pleasant for mornings and evenings on foot in the city, with a midday break when the sun is strongest.
Expect 41 mm of rain — occasional showers rather than washed-out days — alongside about 29 days with 6+ hours of sunshine and 11.4 daylight hours.
It scores 8/10 here, 2nd of 12 months, against 8.4/10 in the destination's best month.
Figure on peak pricing, with 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, a hat and real sun protection.
February in Siem Reap: strong conditions, 3rd of 12
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 days with 6+ hours of sunshine 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.
Figure on mid-season pricing, with 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 · 6/10Days in March average 29°C (84°F) — front-load outdoor plans before the heat builds and treat the middle of the day as indoor time.
Budget for roughly 69 mm of rain this month — a flexible day or two helps — with about 31 days with 6+ hours of sunshine and 12.1 hours of daylight to work around it.
That is 6/10 on the same scale — 4th of 12 months, versus 8.4/10 for the best month here.
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 — off-season conditions
Hardest · 4.2/10April averages 30°C (86°F), so the practical pattern is early mornings, a long midday break, and evenings back outside.
Monthly rainfall reaches 127 mm — wet for this destination — but about 28 days with 6+ hours of sunshine still break through, so keep one indoor fallback in the plan.
It scores 4.2/10 here, 6th of 12 months, against 8.4/10 in the destination's best month.
Plan for low-season pricing, with 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.
Flexible dates? December scores 4.2 points higher here — enough to change the trip.
May in Siem Reap: expect compromises
Hardest · 3/10Days in May average 29°C (84°F) and humidity near 79% — front-load outdoor plans before the heat builds and treat the middle of the day as indoor time.
This is the year's wettest stretch at 278 mm, but with about 29 days with 6+ hours of sunshine it is not a total loss; an indoor fallback covers the risk.
That is 3/10 on the same scale — 12th of 12 months, versus 8.4/10 for the best month here.
Budget for 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) and humidity near 80%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
Monthly rainfall reaches 193 mm — wet for this destination — but about 26 days with 6+ hours of sunshine still break through, so keep one indoor fallback in the plan.
It scores 3.6/10 here, 7th of 12 months, against 8.4/10 in the destination's best month.
Plan for low-season pricing, with 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.
Flexible dates? December scores 4.8 points higher here — enough to change the trip.
July in Siem Reap — the hardest end of the year
Hardest · 3.4/10July averages 27°C (81°F) and humidity near 85%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
324 mm makes this the wettest stretch of the year, though about 22 days with 6+ hours of sunshine still appear — keep an indoor fallback ready.
It scores 3.4/10 here, 9th of 12 months, against 8.4/10 in the destination's best month.
Figure on low-season pricing, with 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.
Flexible dates? December scores 5 points higher here — enough to change the trip.
August in Siem Reap: expect compromises
Hardest · 3.3/10Days in August average 28°C (82°F) and humidity near 84% — front-load outdoor plans before the heat builds and treat the middle of the day as indoor time.
This is the year's wettest stretch at 247 mm, but with about 26 days with 6+ hours of sunshine it is not a total loss; an indoor fallback covers the risk.
That is 3.3/10 on the same scale — 10th of 12 months, versus 8.4/10 for the best month here.
Budget for 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: expect compromises
Hardest · 3.3/10Days in September average 27°C (80°F) and humidity near 88% — front-load outdoor plans before the heat builds and treat the middle of the day as indoor time.
Expect monsoon-level rainfall at 393 mm: only about 19 days with 6+ hours of sunshine across the month, and stretches of heavy rain are normal.
That is 3.3/10 on the same scale — 11th of 12 months, versus 8.4/10 for the best month here.
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) and humidity near 85%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
290 mm makes this the wettest stretch of the year, though about 26 days with 6+ hours of sunshine still appear — keep an indoor fallback ready.
It scores 3.6/10 here, 8th of 12 months, against 8.4/10 in the destination's best month.
Plan for low-season pricing, with 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.
Flexible dates? December scores 4.8 points higher here — enough to change the trip.
November in Siem Reap — workable with trade-offs
Trade-offs · 5.2/10November averages 27°C (80°F) and humidity near 80%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
Monthly rainfall reaches 123 mm — wet for this destination — but about 28 days with 6+ hours of sunshine still break through, so keep one indoor fallback in the plan.
It scores 5.2/10 here, 5th of 12 months, against 8.4/10 in the destination's best month.
Figure on mid-season pricing, with 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.
Flexible dates? December scores 3.2 points higher here — enough to change the trip.
December: the best month of the year in Siem Reap
Best window · 8.4/10At 25°C (78°F) this is comfortable city weather in December, with sightseeing easiest before lunch and after the afternoon peak.
With around 31 mm of rain, any showers tend to pass through rather than settle in; about 30 days with 6+ hours of sunshine and 11.4 hours of daylight fill the rest.
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, a hat and real sun protection.
