Sea temperature in Cambodia
Live water temperatures and swimming conditions across 2 beaches on the Cambodia coast.
Best time to swim in Cambodia
The sea in Cambodia peaks in April, when the water averages around 30°C.
The main swimming season runs from January – December, when surface temperatures stay comfortable for extended sessions.
On average, 12 months a year sit above 20°C — the threshold most swimmers describe as pleasant without a wetsuit.
The coldest month is typically January at around 27°C, when cold-water swimmers dominate the coast.
Cambodia sea temperature history
Long-term climatology for Cambodia shows an annual mean sea temperature of 29°C, ranging from 27°C in winter to 30°C at the summer peak.
The seasonal swing is roughly 3°C between the coldest and warmest month — a useful yardstick when comparing years or checking whether the current sea is running above or below average.
Recent decades have trended slightly warmer at Cambodia, in line with regional sea-surface temperature records for the wider basin.
Monthly averages below are drawn from multi-decadal climatology and are updated as new observations arrive.
Values are area averages; individual beaches vary by exposure and depth.
Cambodia sea temperature: frequently asked questions
What is the warmest month to swim in Cambodia?
April is the warmest month in Cambodia, when the sea averages about 30°C. Late-season warmth often persists a few weeks after peak.
When is the sea coldest in Cambodia?
The coldest month in Cambodia is typically January, when the water averages around 27°C. Cold-water swimmers and surfers dominate this period.
When can you swim in Cambodia without a wetsuit?
The main swimming season in Cambodia runs from January – December — about 12 months a year when the sea sits above 20°C, the level most swimmers describe as pleasant without a wetsuit.
Do I need a wetsuit in Cambodia?
Cambodia stays warm year-round, so most swimmers never need a wetsuit — a rash guard is usually enough for sun and wildlife protection.
What is the average sea temperature in Cambodia?
The long-term annual mean sea temperature in Cambodia is about 29°C, based on multi-decadal climatology of the surrounding waters.
How do I check the current sea temperature in Cambodia?
The live reading at the top of this page shows the current sea temperature in Cambodia, updated hourly from marine buoy and satellite data. The 7-day forecast covers water, air, waves, wind and UV for the week ahead.
Cambodia sea temperature by month
Average sea temperatures around Cambodia for every month of the year, based on long-term Open-Meteo marine climatology.
| Month | Average sea | Swimming comfort |
|---|---|---|
| January | 27.0°C | Very warm, bath-like |
| February | 28.0°C | Very warm, bath-like |
| March | 29.0°C | Very warm, bath-like |
| April ⭐ | 30.0°C | Very warm, bath-like |
| May | 30.0°C | Very warm, bath-like |
| June | 29.0°C | Very warm, bath-like |
| July | 29.0°C | Very warm, bath-like |
| August | 29.0°C | Very warm, bath-like |
| September | 29.0°C | Very warm, bath-like |
| October | 29.0°C | Very warm, bath-like |
| November | 28.0°C | Very warm, bath-like |
| December | 27.0°C | Very warm, bath-like |
Monthly figures are modelled climatology averages, not live readings. How accurate is our data?
Warmest beaches in Cambodia right now
| Beach | Region | Sea | Swim score |
|---|---|---|---|
| Saracen Bay | Sihanoukville | 28.9°C | Excellent |
| Otres Beach | Sihanoukville | 28.4°C | Excellent |
Sea temperature in Cambodia — FAQ
How warm is the sea in Cambodia in September?
The sea off Cambodia averages about 29.0°C in September, based on long-term monthly averages for this coast.
When is the best time to swim in Cambodia?
Cambodia is warmest in April (around 30.0°C) and coldest in January (around 27.0°C). There are typically 12 months a year when the water sits above 22°C.
What is the average yearly sea temperature in Cambodia?
Across all twelve months, the sea in Cambodia averages about 28.7°C.
Do you need a wetsuit to swim in Cambodia?
In peak season (around April, ~30.0°C) most swimmers are comfortable without a wetsuit. Outside summer, when the water drops toward 27.0°C, a 3/2mm to 5/4mm wetsuit is recommended.