Sihanoukville beaches, Koh Rong
Best months: December to April. Rainiest: May to October. Highs range from 83°F (28°C) to 88°F (31°C), sea 84–88°F (29–31°C).
Best Time to Visit Cambodia
The best time to visit Cambodia: in Sihanoukville, December to April; in Siem Reap, June, November to March; in Phnom Penh, December to March. The wettest stretch in Sihanoukville is July, August, September. It is hottest in Phnom Penh in April, with highs of 94°F (35°C). It is coolest in Sihanoukville in September, with highs of 83°F (28°C).
Climate normals were checked on September 29, 2026, over a year ago. An update is due.
Climate normals checked September 29, 2026 · Source: Open-Meteo (ERA5) · How we calculate
Cambodia weather by month
Colour shows the month rating for the best region. See the table below for month-by-month details.
- Jan88°FJanuary: Excellent
- Feb91°FFebruary: Excellent
- Mar88°FMarch: Excellent
- Apr88°FApril: Good
- May87°FMay: Mixed
- Jun90°FJune: Good
- Jul90°FJuly: Mixed
- Aug89°FAugust: Mixed
- Sep88°FSeptember: Mixed
- Oct87°FOctober: Mixed
- Nov87°FNovember: Good
- Dec86°FDecember: Excellent
Excellent Good Mixed Off-season
Cambodia air and sea temperature by month
- Sihanoukville: air
- Sihanoukville: sea
- Siem Reap: air
- Phnom Penh: air
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sihanoukville: air | 85 | 87 | 88 | 88 | 87 | 85 | 84 | 83 | 83 | 84 | 86 | 86 |
| Sihanoukville: sea | 84 | 85 | 86 | 88 | 88 | 86 | 85 | 86 | 85 | 86 | 86 | 85 |
| Siem Reap: air | 88 | 90 | 93 | 94 | 92 | 90 | 89 | 89 | 87 | 87 | 87 | 86 |
| Phnom Penh: air | 89 | 91 | 94 | 94 | 92 | 91 | 90 | 90 | 88 | 87 | 87 | 87 |
Cambodia weather table, month by month
Long-term averages for each region. Tap a region to open its table.
Sihanoukville · beaches, Koh Rong
| Month | Day high | Night low | Sea | Rainy days | Rainfall | Humidity | Sun, h/day |
|---|---|---|---|---|---|---|---|
| January | 85°F (30°C) | 75°F (24°C) | 84°F (29°C) | 13 | 2.8 in (71 mm) | 77% | 10.5 |
| February | 87°F (30°C) | 75°F (24°C) | 85°F (29°C) | 14 | 1.8 in (46 mm) | 77% | 10.9 |
| March | 88°F (31°C) | 77°F (25°C) | 86°F (30°C) | 18 | 3.1 in (78 mm) | 79% | 11.2 |
| April | 88°F (31°C) | 78°F (26°C) | 88°F (31°C) | 22 | 5.1 in (130 mm) | 80% | 11.3 |
| May | 87°F (31°C) | 79°F (26°C) | 88°F (31°C) | 29 | 11.7 in (296 mm) | 84% | 9.6 |
| June | 85°F (29°C) | 78°F (26°C) | 86°F (30°C) | 28 | 14.5 in (369 mm) | 85% | 8.1 |
| July | 84°F (29°C) | 77°F (25°C) | 85°F (30°C) | 29 | 20.5 in (520 mm) | 87% | 7.5 |
| August | 83°F (29°C) | 77°F (25°C) | 86°F (30°C) | 30 | 17.7 in (450 mm) | 87% | 8.0 |
| September | 83°F (28°C) | 77°F (25°C) | 85°F (30°C) | 29 | 20.4 in (517 mm) | 88% | 7.0 |
| October | 84°F (29°C) | 76°F (24°C) | 86°F (30°C) | 28 | 15.9 in (405 mm) | 88% | 8.3 |
| November | 86°F (30°C) | 76°F (25°C) | 86°F (30°C) | 22 | 7.2 in (182 mm) | 83% | 9.9 |
| December | 86°F (30°C) | 76°F (24°C) | 85°F (29°C) | 13 | 3.1 in (79 mm) | 76% | 10.1 |
Siem Reap · Angkor temples
| Month | Day high | Night low | Rainy days | Rainfall | Humidity | Sun, h/day |
|---|---|---|---|---|---|---|
| January | 88°F (31°C) | 71°F (22°C) | 2 | 0.6 in (16 mm) | 64% | 10.5 |
| February | 90°F (32°C) | 73°F (23°C) | 4 | 1.0 in (26 mm) | 62% | 10.8 |
| March | 93°F (34°C) | 77°F (25°C) | 10 | 2.0 in (51 mm) | 66% | 11.2 |
| April | 94°F (34°C) | 78°F (26°C) | 14 | 3.8 in (97 mm) | 70% | 11.0 |
| May | 92°F (33°C) | 79°F (26°C) | 23 | 7.4 in (188 mm) | 77% | 10.3 |
| June | 90°F (32°C) | 79°F (26°C) | 22 | 5.7 in (144 mm) | 78% | 9.7 |
| July | 89°F (32°C) | 78°F (26°C) | 25 | 8.3 in (211 mm) | 80% | 8.4 |
| August | 89°F (32°C) | 78°F (25°C) | 25 | 8.0 in (204 mm) | 80% | 8.8 |
| September | 87°F (31°C) | 76°F (25°C) | 27 | 12.5 in (318 mm) | 85% | 8.1 |
| October | 87°F (30°C) | 75°F (24°C) | 23 | 9.8 in (249 mm) | 84% | 9.0 |
| November | 87°F (31°C) | 74°F (23°C) | 13 | 4.0 in (102 mm) | 78% | 9.9 |
| December | 86°F (30°C) | 71°F (22°C) | 4 | 1.1 in (27 mm) | 69% | 10.1 |
Phnom Penh · capital, city break
| Month | Day high | Night low | Rainy days | Rainfall | Humidity | Sun, h/day |
|---|---|---|---|---|---|---|
| January | 89°F (31°C) | 73°F (23°C) | 4 | 0.7 in (18 mm) | 67% | 10.4 |
| February | 91°F (33°C) | 74°F (23°C) | 2 | 0.6 in (14 mm) | 62% | 11.0 |
| March | 94°F (34°C) | 77°F (25°C) | 5 | 1.5 in (37 mm) | 63% | 11.4 |
| April | 94°F (35°C) | 79°F (26°C) | 14 | 3.7 in (95 mm) | 69% | 11.2 |
| May | 92°F (34°C) | 79°F (26°C) | 25 | 7.0 in (177 mm) | 77% | 10.1 |
| June | 91°F (33°C) | 78°F (26°C) | 24 | 6.3 in (161 mm) | 79% | 9.3 |
| July | 90°F (32°C) | 78°F (25°C) | 24 | 7.4 in (189 mm) | 80% | 8.4 |
| August | 90°F (32°C) | 77°F (25°C) | 26 | 8.2 in (209 mm) | 80% | 9.0 |
| September | 88°F (31°C) | 77°F (25°C) | 28 | 11.7 in (297 mm) | 85% | 8.0 |
| October | 87°F (30°C) | 76°F (24°C) | 25 | 12.0 in (306 mm) | 85% | 8.7 |
| November | 87°F (31°C) | 75°F (24°C) | 16 | 6.0 in (152 mm) | 80% | 9.8 |
| December | 87°F (30°C) | 74°F (23°C) | 7 | 1.6 in (40 mm) | 72% | 9.9 |
Best time to visit Cambodia for beaches, sightseeing and savings
| Goal | When to go |
|---|---|
| Beach holiday | Sihanoukville: December to April |
| Sightseeing | Sihanoukville: December to March Siem Reap: December Phnom Penh: December |
| Peak season | December to March |
| Cheaper: shoulder season | April, November |
- Beach holiday — sea 75°F (24°C)+, highs 75–95°F (24–35°C), rain under 150 mm
- Sightseeing — highs 63–88°F (17–31°C), rain under 100 mm
- Peak season — the best weather rating of the year
- Cheaper: shoulder season — months next to peak season, weather still decent
Shoulder season is a weather-based estimate, not a price check: demand is lower in these months, so flights and hotels are usually cheaper than at peak. We do not compare prices here; check them for your dates.
- Compare with other destinations: where to go in January, where to go in February, where to go in March, where to go in December.
How to use it
- Read the calendar: green is in season, red is off-season.
- Open a region table for highs and lows, sea temperature, rainfall, rainy days, humidity and sunshine.
- Pick your goal in the “When to go” block: beach, sightseeing or shoulder season.
- Compare with other destinations in “Where to go” for your month.
When to visit each region of Cambodia
Siem Reap Angkor temples
Best months: June, November to March. Rainiest: July to October. Highs range from 86°F (30°C) to 94°F (34°C).
Phnom Penh capital, city break
Best months: December to March. Rainiest: August to October. Highs range from 87°F (30°C) to 94°F (35°C).
Best time to visit Cambodia: FAQ
When is the best time to visit Cambodia?
The best time to visit Cambodia: in Sihanoukville, December to April; in Siem Reap, June, November to March; in Phnom Penh, December to March. The wettest stretch in Sihanoukville is July, August, September. It is hottest in Phnom Penh in April, with highs of 94°F (35°C). It is coolest in Sihanoukville in September, with highs of 83°F (28°C).
What is Cambodia's rainy season?
Months with more than 200 mm (7.9 in) of rain: in Sihanoukville, May to October; in Siem Reap, July to October; in Phnom Penh, August to October. The wettest month in Sihanoukville is July, with about 20.5 in (520 mm).
Is Cambodia hot all year?
Day highs in Sihanoukville range from 83°F (28°C) to 88°F (31°C). The hottest month is April in Phnom Penh, at 94°F (35°C).
Where the data comes from
- Air temperature, rainfall, humidity — ERA5 reanalysis (Copernicus / ECMWF) via Open-Meteo, averaged over 2015–2024. Each region uses one point: the resort or city in its caption.
- Sea temperature — Open-Meteo Marine, average sea surface temperature for 2023–2026 (the source has no longer record yet).
- Sunshine — sunshine duration from the same ERA5 reanalysis (Open-Meteo), average hours of sun per day for the month, 2015–2024.
- Rainy days — days with at least 1 mm (0.04 in) of rain. Reanalysis picks up light rain more often than weather stations, so treat this as an upper bound.
- Month rating — one rule for every destination, based on three factors: day highs (ideal 75–91°F / 24–33°C), monthly rainfall (ideal under 80 mm / 3.1 in) and, for beach regions, sea temperature (ideal 77°F / 25°C or warmer). All ideal means Excellent; one slightly weaker factor means Good. Mixed means heavy rain (150 mm / 5.9 in or more), highs above 97°F (36°C) or a sea below 70°F (21°C). Off-season means highs of 100°F (38°C) or more, cold below 54°F (12°C), over 350 mm (13.8 in) of rain, or several problems at once. A country's rating follows its best region, so check the regional table.
- Licence — weather data by Open-Meteo.com under CC BY 4.0; ERA5 reanalysis by the Copernicus Climate Change Service / ECMWF. The normals are precomputed and stored on this site, so the page sends no requests to the source.
Checked September 29, 2026. Climate normals are refreshed yearly and the notes every 90 days. These are long-term averages, not a forecast: any given year can differ.
