January in Sihanoukville — one of the year's strongest windows (2nd)
Best window · 9.6/10Days in January average 27°C (80°F) and humidity near 77% — front-load outdoor plans before the heat builds and treat the middle of the day as indoor time.
With around 19 mm of rain, any showers tend to pass through rather than settle in; about 21 days with 6+ hours of sunshine and 11.4 hours of daylight fill the rest.
On our climate-comfort scale this is one of the strongest months of the year for Sihanoukville at 9.6/10 (2nd of 12), just behind February at 9.8/10.
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.
February: the best month of the year in Sihanoukville
Best window · 9.8/10Days in February average 28°C (82°F) and humidity near 74% — front-load outdoor plans before the heat builds and treat the middle of the day as indoor time.
With around 32 mm of rain, any showers tend to pass through rather than settle in; about 23 days with 6+ hours of sunshine and 11.7 hours of daylight fill the rest.
On our climate-comfort scale this is the top-ranked month of the year for Sihanoukville at 9.8/10 — the reference point every other month on this page is measured against.
Budget for 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.
March is one of the strongest months in Sihanoukville (3rd)
Best window · 9/10March averages 28°C (83°F) and humidity near 74%, 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 28 days with 6+ hours of sunshine and 11.9 hours of daylight.
A 9/10 puts this among the year's best months in Sihanoukville (3rd of 12); only February scores higher, at 9.8/10.
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.
April in Sihanoukville — reliably good (5th best month)
Good · 8.3/10Days in April average 29°C (85°F) and humidity near 75% — front-load outdoor plans before the heat builds and treat the middle of the day as indoor time.
Budget for roughly 83 mm of rain this month — a flexible day or two helps — with about 26 days with 6+ hours of sunshine and 12.2 hours of daylight to work around it.
That is 8.3/10 on the same scale — 5th of 12 months, versus 9.8/10 for the best month here.
Budget for 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, February is materially better in Sihanoukville — 1.5 points higher on the same scale.
May in Sihanoukville — workable with trade-offs
Trade-offs · 6.3/10May averages 29°C (85°F) and humidity near 79%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
Monthly rainfall reaches 177 mm — wet for this destination — but about 20 days with 6+ hours of sunshine still break through, so keep one indoor fallback in the plan.
It scores 6.3/10 here, 6th of 12 months, against 9.8/10 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? February scores 3.5 points higher here — enough to change the trip.
June in Sihanoukville: mixed conditions, plan around the weather
Trade-offs · 5.6/10Days in June average 29°C (83°F) and humidity near 83% — front-load outdoor plans before the heat builds and treat the middle of the day as indoor time.
Expect monsoon-level rainfall at 227 mm: only about 17 days with 6+ hours of sunshine across the month, and stretches of heavy rain are normal.
That is 5.6/10 on the same scale — 9th of 12 months, versus 9.8/10 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, February is materially better in Sihanoukville — 4.2 points higher on the same scale.
July in Sihanoukville — off-season conditions
Hardest · 4.8/10Days in July average 28°C (82°F) and humidity near 85% — front-load outdoor plans before the heat builds and treat the middle of the day as indoor time.
Expect monsoon-level rainfall at 452 mm: only about 12 days with 6+ hours of sunshine across the month, and stretches of heavy rain are normal.
That is 4.8/10 on the same scale — 11th of 12 months, versus 9.8/10 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, February is materially better in Sihanoukville — 5 points higher on the same scale.
August in Sihanoukville: mixed conditions, plan around the weather
Trade-offs · 5.5/10August averages 28°C (82°F) and humidity near 85%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
272 mm of rain puts this in monsoon territory — about 18 days with 6+ hours of sunshine across the whole month, and multi-day washouts are normal.
It scores 5.5/10 here, 10th of 12 months, against 9.8/10 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? February scores 4.3 points higher here — enough to change the trip.
September in Sihanoukville — the hardest end of the year
Hardest · 4.8/10September averages 28°C (82°F) and humidity near 86%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
464 mm of rain puts this in monsoon territory — about 12 days with 6+ hours of sunshine across the whole month, and multi-day washouts are normal.
It scores 4.8/10 here, 12th of 12 months, against 9.8/10 in the destination's best month.
Figure on 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? February scores 5 points higher here — enough to change the trip.
October in Sihanoukville: mixed conditions, plan around the weather
Trade-offs · 5.7/10Days in October average 28°C (82°F) and humidity near 85% — 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 263 mm, but with about 20 days with 6+ hours of sunshine it is not a total loss; an indoor fallback covers the risk.
That is 5.7/10 on the same scale — 8th of 12 months, versus 9.8/10 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, February is materially better in Sihanoukville — 4.1 points higher on the same scale.
November in Sihanoukville — middling scores, decent value
Trade-offs · 6.3/10Days in November average 27°C (81°F) and humidity near 84% — front-load outdoor plans before the heat builds and treat the middle of the day as indoor time.
164 mm of rain makes this a wet month here, though with about 20 days with 6+ hours of sunshine there is still bright weather between the fronts.
That is 6.3/10 on the same scale — 7th of 12 months, versus 9.8/10 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, February is materially better in Sihanoukville — 3.5 points higher on the same scale.
December ranks 4th of 12 for Sihanoukville — one of the best windows
Best window · 9/10December averages 26°C (80°F) and humidity near 82%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
Rainfall runs 46 mm, so plan one flexible day in three; you still get about 20 days with 6+ hours of sunshine and 11.4 hours of daylight.
A 9/10 puts this among the year's best months in Sihanoukville (4th of 12); only February scores higher, at 9.8/10.
Plan for peak pricing, with crowds are moderate.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a packable rain layer.
