Weather in Siem Reap in December
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Compare car hire prices → Affiliate link — we earn a commission at no extra cost to youIn December, Siem Reap sees average highs of 29.8°C (85.6°F) and lows of 21.1°C. Conditions are hot and mostly dry with only occasional showers, with roughly 10.1 hours of sunshine a day. It is one of the best months of the year to visit. For the complete picture, see the best time to visit Siem Reap — every month compared. Once you know when to go, find your Siem Reap packing list at 247PackingList.
Get ready for Siem Reap in December
Search flights to Siem Reap
Compare 100+ airlines for December — one search, best price.
Search Flights →Lightweight travel clothing
Lightweight, breathable clothing and a compact travel umbrella are essential in this climate.
Check Price →What to pack for Siem Reap in December
- Light layers
- Sunscreen
- T-shirts and light trousers or shorts
Compare all months in Siem Reap
| Month | High | Rain | Rating |
|---|---|---|---|
| January | 31.0°C | 31.1mm | 10/10 |
| February | 32.7°C | 36.1mm | 10/10 |
| March | 34.6°C | 47.5mm | 10/10 |
| April | 33.6°C | 156.1mm | 9/10 |
| May | 33.1°C | 227.2mm | 8/10 |
| June | 32.9°C | 162.3mm | 9/10 |
| July | 31.7°C | 268.7mm | 8/10 |
| August | 31.7°C | 237.6mm | 8/10 |
| September | 30.3°C | 396.0mm | 8/10 |
| October | 30.0°C | 309.8mm | 8/10 |
| November | 30.2°C | 132.1mm | 9/10 |
| December | 29.8°C | 28.9mm | 10/10 |
Full month-by-month guide: best time to visit Siem Reap →
For facts about Cambodia — currency, language and dialling code — see our Cambodia country guide at 247CountryInfo. Travellers also find it useful to keep a Siem Reap travel guide to hand. Check clothing sizes in Cambodia before you shop.
Frequently Asked Questions
Is December a good time to visit Siem Reap?
December rates 10/10 for visiting Siem Reap — excellent time to visit. Expect average highs of 29.8°C, 28.9mm of rain across the month and about 10.1 hours of daily sunshine.
What is the temperature in Siem Reap in December?
In December, Siem Reap has average highs of 29.8°C (85.6°F) and average lows of 21.1°C (70.0°F).
Does it rain in Siem Reap in December?
Not much. December averages just 28.9mm of rain in Siem Reap — the odd shower is possible but most days stay dry.
What should I wear in Siem Reap in December?
For Siem Reap in December (29.8°C highs / 21.1°C lows), pack light layers plus sunscreen, t-shirts and light trousers or shorts.
More essentials for Siem Reap in December
Packing cubes
Keep the bag organised whatever the weather — compression cubes for every size.
Check Price →Travel first aid kit
Compact TSA-friendly kit for peace of mind wherever you travel.
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Climate data sourced from Open-Meteo (open source, open data licence). Monthly averages calculated from 2020–2023 historical data. Weather can be unpredictable — always check a live forecast before travelling.