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Climate · Siem Reap

Siem Reap in December

Hot and mostly dry, as the days hold steady.

Typical weather, averaged over 30 years

December in Siem Reap is hot: highs near 89°F, lows near 70°F. Rain falls on about one day a week, less often as the month goes on, and daylight holds at about 11 hours 21 minutes.December in Siem Reap is hot: highs near 32°C, lows near 21°C. Rain falls on about one day a week, less often as the month goes on, and daylight holds at about 11 hours 21 minutes.

High
89°F32°Caverage
Low
70°F21°Caverage
Wet days
1a week · 13% of days
Daylight
11h 21mon average

Is December a good time to visit Siem Reap?

Yes. December is one of Siem Reap's most comfortable months (December to January).

How we judge it: every month is scored on how close its typical high comes to the range from 70°F to 80°F, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.How we judge it: every month is scored on how close its typical high comes to the range from 21°C to 27°C, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.

How December sits in the year

week by week

Temperature

Highs near 89°F in December, against 89°F to 96°F through the year.Highs near 32°C in December, against 32°C to 36°C through the year.

Chance of a wet day

13% of days in December, against 6% to 90% through the year.

Cloud cover

61% cover in December, against 54% to 81% through the year.

Daylight

11h 21m in December, against 11h 21m to 12h 54m through the year.

Week by week, lightly smoothed, with December shaded. The olive line marks the most comfortable months. Hover or tap a week for its figures.

Either side

  1. November89°32°low 73°low 23°3 wet days a weekRain on about three days a week.
  2. December89°32°low 70°low 21°1 wet day a weekRain on about one day a week.
  3. January91°33°low 70°low 21°no wet daysRain on fewer than one day a week.

Where Siem Reap sits, in December

Asia/Phnom Penh
this place
typical high in December 40°F4°C95°F35°C
Sunrise, mid-December
6:19 AMsets 5:40 PM
Above the sea
30 mlow-lying
Latitude
13.4°Nnorthern hemisphere
Nearest of ours
Phnom Penh230 km south-east

The land around Siem Reap, shaded by its typical high in December, the planning map's own layer. Hover the map for the figure at that spot; tap it on a phone. Clock times are local, for the 15th.

Elsewhere in Cambodia in December

high · low · wet days
See December on the planning mapThe whole year in Siem Reap

Typical weather, averaged over 30 years (1995–2024), from the 11 km grid square nearest Siem Reap. Temperatures are adjusted against 66 weather stations: daytime highs read about 3.1°F cold in the source data and are raised to match.Temperatures are adjusted against 66 weather stations: daytime highs read about 1.7°C cold in the source data and are raised to match. Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not. Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.

Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not.

Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.