AI-generatedSiem Reap (Angkor) at a glance
- Best time
- Dec – Feb
- Warmest month
- Apr · 34°
- Sunshine a year
- 2,350 h
- Rain a year
- 1,500 mm
- Climate
- Tropical
- Time zone
- UTC+7
- Elevation
- 18 m
Climate in Siem Reap (Angkor)
Siem Reap (Angkor) has a tropical climate: it is warm all year round, and the seasons differ mainly in how much rain falls. April is the warmest month with average highs of 34 °C, while December is the coolest at 30 °C. With around 2,350 hours of sunshine a year, Siem Reap (Angkor) is sunny; February is the sunniest month with 8.0 hours a day.
Holiday weather through the year
Weather in October
Holiday weather in October
Poor
Best time to visit: December – February
Keep in mindFrequent rain
A typical day in October
- Morning, 08:00: about 27°
- Midday, 13:00: about 30°
- Afternoon, 16:00: about 29°
- Evening, 20:00: about 27°
- Night, 23:00: about 26°
05:5517:46
Warm enough for a T-shirt in the evening.
Estimated from the average high and low: coolest around sunrise, warmest in mid-afternoon.
What is the weather like in Siem Reap (Angkor) in October?
In October, Siem Reap (Angkor) is hot: daytime highs average 30 °C, and even at night it stays warm at around 24 °C. Expect around 5 hours of sunshine a day. It is the rainy season: rain falls on about 24 days, totalling 234 mm. On about 19 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, October is not an ideal month for a holiday in Siem Reap (Angkor).
More details for October
- Daylight
- 11 h 51 min05:55 – 17:46
- UV index
- 11 · extremeclear sky, noon (estimate)All months
- Muggy days
- 31 daysdew point 18 °C or more
- Wind
- 11 km/haverage daily peak
- Cloud cover
- 78 %on average
- Hot days
- 19 days30 °C or more
- Time zone
- UTC+7Asia/Phnom_Penh
How the score comes together
- Temperatureweight 50 %63 %
- Sunshineweight 20 %40 %
- Few rainy daysweight 30 %0 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in October
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Water bottle – drink plenty
- Insect repellent
- Rain jacket or umbrella
Sunshine hours in Siem Reap (Angkor)
Average hours of bright sunshine per day, next to the length of the day. Tap a month to select it.
In October, the sun shines for about 5.4 of 11.9 hours of daylight in Siem Reap (Angkor), 45 % of the day.
Sunshine hours: estimated from radiation data (ERA5, 1996–2025) and calibrated against measured station values; no weather station is close enough here. Daylight is the time from sunrise to sunset on the 15th of the month.
UV index in Siem Reap (Angkor)
How strong the sun is at noon, month by month, and how quickly unprotected skin burns.
- Clear-sky UV in October
- 11 · extremeAvoid the midday sun; SPF 50+, covering clothes, hat and sunglasses.
The sun is strongest in August (UV 13).
Minutes until sunburn in October
- Very fair skin
- about 10 min
- Fair skin
- about 15 min
- Light brown skin
- about 20 min
- Olive skin
- about 25 min
Rough guide for unprotected skin at noon under a clear sky; clouds lengthen it, water, sand and snow shorten it. Sunscreen extends the time only partly.
Monthly values: clear-sky noon estimate from the sun's angle, ozone and altitude. UV today: Open-Meteo forecast.
Rain in Siem Reap (Angkor): rainy days and rainfall
A rainy day is a day with at least 1 mm of rain or snow; the amount is what falls in the whole month. Tap a month to select it.
In October, Siem Reap (Angkor) has about 24 rainy days with 234 mm of rain in total.
Climate through the year
Long-term monthly averages. Tap a month to see its details.
Temperatures through the year
Average daytime high, night-time low and sea temperature per month.
| Month | Score | Day | Night | Sun | Rain days | Rain mm |
|---|---|---|---|---|---|---|
| JanuaryJan | 74 | 31° | 22° | 7.9 h | 2 | 11 |
| FebruaryFeb | 64 | 32° | 24° | 8.0 h | 4 | 20 |
| MarchMar | 43 | 34° | 26° | 7.9 h | 10 | 56 |
| AprilApr | 28 | 34° | 26° | 7.4 h | 16 | 117 |
| MayMay | 26 | 33° | 27° | 6.2 h | 23 | 177 |
| JuneJun | 29 | 32° | 26° | 5.8 h | 22 | 145 |
| JulyJul | 30 | 31° | 26° | 5.2 h | 25 | 165 |
| AugustAug | 31 | 31° | 26° | 5.1 h | 25 | 185 |
| SeptemberSep | 35 | 30° | 25° | 4.5 h | 27 | 291 |
| OctoberOct | 39 | 30° | 24° | 5.4 h | 24 | 234 |
| NovemberNov | 58 | 30° | 24° | 6.6 h | 11 | 81 |
| DecemberDec | 77 | 30° | 22° | 7.2 h | 3 | 18 |
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0)
13.36° N, 103.86° E · 18 m · Asia/Phnom_Penh
Best time to visit Siem Reap (Angkor)
The best time to visit Siem Reap (Angkor) is from December to February. From March to April it can get very hot, with highs of up to 34 °C. Rain is most frequent from April to October; the wettest month is September with 291 mm.
Siem Reap (Angkor) through the seasons
How the weather changes over the seasons, with averages for each.
Siem Reap (Angkor) in the dry season
Nov – Mar
Good
- 30–34 °C by day
- 8 h of sun a day
- 31 rainy days in all
Siem Reap (Angkor) in the rainy season
Apr – Oct
Poor
- 30–34 °C by day
- 6 h of sun a day
- 162 rainy days in all
Find your perfect month
Tell us what you like and we rate every month in Siem Reap (Angkor) for you.
Your best months: December – January
Based on the climate averages; tap a month to see its details.
Which month for what?
Beach & swimming
No sea nearby
Sea from 21 °C, warm and mostly dry
Sightseeing & hiking
No month
15–28 °C and not too much rain
Peak heat
Mar – Apr
Highs of 33 °C or more
Rainy months
Apr – Oct
12 or more rainy days
Siem Reap (Angkor) month by month
The typical weather for every month at a glance.
74January31° · 8 h
In January, Siem Reap (Angkor) is hot: daytime highs average 31 °C, and even at night it stays warm at around 22 °C. The sun shines for around 8 hours a day. Rain is rare: about 2 days bring 11 mm in total. On about 21 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, January is a good month for a holiday in Siem Reap (Angkor).
Siem Reap (Angkor) in January64February32° · 8 h
In February, Siem Reap (Angkor) is hot: daytime highs average 32 °C, and even at night it stays warm at around 24 °C. The sun shines for around 8 hours a day. Rain is rare: about 4 days bring 20 mm in total. On about 26 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, February is a good month for a holiday in Siem Reap (Angkor).
Siem Reap (Angkor) in February43March34° · 8 h
In March, Siem Reap (Angkor) is very hot: daytime highs average 34 °C, and even at night it stays warm at around 26 °C. The sun shines for around 8 hours a day. Rain is frequent, with about 10 rainy days and 56 mm in total. On about 30 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, March is a so-so month for a holiday in Siem Reap (Angkor).
Siem Reap (Angkor) in March28April34° · 7 h
In April, Siem Reap (Angkor) is very hot: daytime highs average 34 °C, and even at night it stays warm at around 26 °C. The sun shines for around 7 hours a day. It is the rainy season: rain falls on about 16 days, totalling 117 mm. On about 29 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, April is not an ideal month for a holiday in Siem Reap (Angkor).
Siem Reap (Angkor) in April26May33° · 6 h
In May, Siem Reap (Angkor) is hot: daytime highs average 33 °C, and even at night it stays warm at around 27 °C. Expect around 6 hours of sunshine a day. It is the rainy season: rain falls on about 23 days, totalling 177 mm. On about 29 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, May is not an ideal month for a holiday in Siem Reap (Angkor).
Siem Reap (Angkor) in May29June32° · 6 h
In June, Siem Reap (Angkor) is hot: daytime highs average 32 °C, and even at night it stays warm at around 26 °C. Expect around 6 hours of sunshine a day. It is the rainy season: rain falls on about 22 days, totalling 145 mm. On about 26 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, June is not an ideal month for a holiday in Siem Reap (Angkor).
Siem Reap (Angkor) in June30July31° · 5 h
In July, Siem Reap (Angkor) is hot: daytime highs average 31 °C, and even at night it stays warm at around 26 °C. Expect around 5 hours of sunshine a day. It is the rainy season: rain falls on about 25 days, totalling 165 mm. On about 25 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, July is not an ideal month for a holiday in Siem Reap (Angkor).
Siem Reap (Angkor) in July31August31° · 5 h
In August, Siem Reap (Angkor) is hot: daytime highs average 31 °C, and even at night it stays warm at around 26 °C. Expect around 5 hours of sunshine a day. It is the rainy season: rain falls on about 25 days, totalling 185 mm. On about 25 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, August is not an ideal month for a holiday in Siem Reap (Angkor).
Siem Reap (Angkor) in August35September30° · 5 h
In September, Siem Reap (Angkor) is hot: daytime highs average 30 °C, and even at night it stays warm at around 25 °C. Expect around 5 hours of sunshine a day. It is the rainy season: rain falls on about 27 days, totalling 291 mm. On about 18 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, September is not an ideal month for a holiday in Siem Reap (Angkor).
Siem Reap (Angkor) in September39October30° · 5 h
In October, Siem Reap (Angkor) is hot: daytime highs average 30 °C, and even at night it stays warm at around 24 °C. Expect around 5 hours of sunshine a day. It is the rainy season: rain falls on about 24 days, totalling 234 mm. On about 19 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, October is not an ideal month for a holiday in Siem Reap (Angkor).
Siem Reap (Angkor) in October58November30° · 7 h
In November, Siem Reap (Angkor) is hot: daytime highs average 30 °C, and even at night it stays warm at around 24 °C. The sun shines for around 7 hours a day. Rain is frequent, with about 11 rainy days and 81 mm in total. On about 16 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, November is a so-so month for a holiday in Siem Reap (Angkor).
Siem Reap (Angkor) in November77December30° · 7 h
In December, Siem Reap (Angkor) is hot: daytime highs average 30 °C, and even at night it stays warm at around 22 °C. The sun shines for around 7 hours a day. Rain is rare: about 3 days bring 18 mm in total. On about 15 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, December is a good month for a holiday in Siem Reap (Angkor).
Siem Reap (Angkor) in DecemberSiem Reap (Angkor) compared
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Siem Reap (Angkor) vs. Pattaya
In October the holiday weather in Siem Reap (Angkor) and Pattaya is about equally good (score 39 vs. 38). During the day it is about as warm in Pattaya as in Siem Reap (Angkor).
| in October | Siem Reap (Angkor) | Pattaya |
|---|---|---|
| Holiday score | 39 | 38 |
| Daytime high | 30° | 30° |
| Sea | – | 30° |
| Sunshine | 5 h | 5 h |
| Rainy days | 24 | 23 |
| Best time | Dec – Feb | Nov – Apr |
Through the year
Planning a trip to Siem Reap (Angkor)
Weather for your travel dates
Pick your arrival and length of stay, and we sum up the weather to expect.
Getting there
Flying from
- Nonstop flight
- about 12 h 20 min
- Distance
- 9,810 km
- Time zone
- UTC+7
Most routes need a change of planes, which adds time.
Estimated from the straight-line distance: 30 minutes for take-off and landing plus 830 km/h cruising speed.
Frequently asked questions about Siem Reap (Angkor)
When is the best time to visit Siem Reap (Angkor)?
The best time to visit Siem Reap (Angkor) is from December to February. That is when the holiday weather score, which combines temperature, sea, sunshine and rain, is highest.
What is the warmest month in Siem Reap (Angkor)?
April is the warmest month, with average highs of 34 °C and nights around 26 °C. December is the coolest month at 30 °C.
When does it rain most in Siem Reap (Angkor)?
Rain is most frequent from April to October; the wettest month is September with 291 mm. The driest month is January with 11 mm.
How many hours of sunshine does Siem Reap (Angkor) get?
Siem Reap (Angkor) gets around 2,350 hours of sunshine a year. The sunniest month is February with 8.0 hours a day; in September there are 4.5 hours a day.
What time zone is Siem Reap (Angkor) in?
Siem Reap (Angkor) uses the time zone Asia/Phnom_Penh, at UTC+7 all year.
How long is the flight from London to Siem Reap (Angkor)?
A nonstop flight from London to Siem Reap (Angkor) takes about 12 h 20 min, for a straight-line distance of about 9,810 km. Most routes need a change of planes, which adds time.
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