What is the weather like in Siem Reap in January?

Expect temperatures between 21°C and 31°C with 3% average rain probability and about 8 hours of sunshine daily.

What is the weather like in Siem Reap in January?

Siem Reap in January scores 66/100 based on 30 years of climate data. Very good conditions overall.

Who should visit Siem Reap in January?

January in Siem Reap is ideal for: Families with children, Photographers, Cultural tourists, Honeymoon couples, Business travelers.

Siem Reap Weather in January | 30-Year Forecast

Avg High

31°C

Hottest around day 31

Avg Low

21°C

Coolest around day 1

Rainy Days

0days

3% avg rain chance

Sunshine

8hrs/day

Winter season

Essential Travel Info for Siem Reap

🗓️ Best Time to Visit 📖 Travel Guide 🍴 Food Guide

Currency

KHR

៛ Cambodian riel

Language

Khmer

Driving

Right side

Connect

Wifi is available in all the usual place...

Safety

High Safety

GPI: 1.882

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Health & Safety Advisory

CDC travel health recommendations

10 Recommendations

COVID-19

All eligible travelers should be up to date with their COVID-19 vaccines. Please seeYour COVID-19 Vaccinationfor more information.

Chikungunya

All travelers should take steps to prevent mosquito bites. Chikungunya vaccination is generally not recommended. Travelers who wish to consider vaccination can visit “What to consider before traveling” on thechikungunya vaccinespage to learn more.

Hepatitis A

Recommended for unvaccinated travelers one year old or older going to Cambodia.Infants 6 to 11 months old should also be vaccinated against Hepatitis A. The dose does not count toward the routine 2-dose series.Travelers allergic to a vaccine component should receive a single dose of immune globulin, which provides effective protection for up to 2 months depending on dosage given.Unvaccinated travelers who are over 40 years old, are immunocompromised, or have chronic medical conditions planning to depart to a risk area in less than 2 weeks should get the initial dose of vaccine and at the same appointment receive immune globulin.

Hepatitis B

Recommended for unvaccinated travelers younger than 60 years old traveling to Cambodia. Unvaccinated travelers 60 years and older may get vaccinated before traveling to Cambodia.

Japanese Encephalitis

Recommended for travelers whoAre moving to an area with Japanese encephalitis to liveSpend long periods of time, such as a month or more, in areas with Japanese encephalitisFrequently travel to areas with Japanese encephalitisConsider vaccination for travelersSpending less than a month in areas with Japanese encephalitis but will be doing activities that increase risk of infection, such as visiting rural areas, hiking or camping, or staying in places without air conditioning, screens, or bed netsGoing to areas with Japanese encephalitis who are uncertain of their activities or how long they will be thereNot recommended for travelers planning short-term travel to urban areas or travel to areas with no clear Japanese encephalitis season.

Malaria

CDC recommends that travelers going to certain areas of Cambodia take prescription medicine to prevent malaria. Depending on the medicine you take, you will need to start taking this medicine multiple days before your trip, as well as during and after your trip. Talk to your doctor about which malaria medication you should take.Transmission areasPrimarily isolated to pockets in rural and forested areasRare cases in non-forested areasNo (or negligible) malaria transmission in the cities of Phnom Penh (the capital) and Siem ReapNo (or negligible) malaria transmission at the main temple complex at Angkor WatDrug resistanceChloroquine and mefloquineSpeciesP. vivax(95%)P. falciparum(5%)P. malariaeandP. knowlesi6(rare)Recommended chemoprophylaxisRural and forested areas: Atovaquone-proguanil, doxycycline, primaquine5, tafenoquine2Areas with rare cases: No chemoprophylaxis recommended (insect bite precautions and mosquito avoidance only)4Updated April 23, 2025See footnotes

+4 more

Source: CDC Travelers' Health

View Complete Health Guide

Is January a Good Time to Visit Siem Reap?

👍Very good conditions overall(66/100)

Short Answer

January isn't Siem Reap's most comfortable season - 31°C and sticky 63% humidity will challenge most visitors. Consider air-conditioned tours and plan for afternoon breaks.

Decision Factors

Vaccinations required

Yellow Fever

Excellent dry conditions

Only 3% rain probability - ideal for outdoor activities

Health precautions needed

Be aware of: Leptospirosis, Melioidosis, Schistosomiasis

Plenty of sunshine

10.1h of sunshine daily

Shoulder season - balanced conditions

50% of peak - good value with moderate crowds

Good For

👨‍👩‍👧‍👦
Families with children
Comfortable 30.9°C temperatures and low 3% rain risk
📸
Photographers
10.1h sunshine, 53% clear skies for golden hour shots
🏛️
Cultural tourists
Comfortable conditions for exploring museums and sites
💑
Honeymoon couples
Wedding score 99/100 with romantic weather conditions
💼
Business travelers
Climate-controlled meetings unaffected by weather

Who Should Avoid

🌡️
Heat-sensitive visitors
35°C feels-like temperature creates discomfort

"According to 30YearWeather's analysis of 30 years of NASA POWER satellite data,Siem Reap in January averages 31°C with 3% precipitation probability."

📊 Source: 30YearWeather.com🛰️ Data: NASA POWER (1991-2021)View Methodology →

Frequently Asked Questions: Siem Reap in January

What are the temperatures in Siem Reap in January?

Daytime highs average 31°C, nights drop to 21°C. Temperatures remain fairly consistent.

How many rainy days in Siem Reap in January?

Expect around 0 days with measurable rainfall. Rain is unlikely to disrupt plans.

What to wear in Siem Reap in January?

Light, breathable fabrics. Don't forget sunglasses and a hat.

Is January peak season in Siem Reap?

This is shoulder season—moderate prices and manageable crowds.

Siem Reap Weather in January

Siem Reap January Weather Calendar