Month by month
| Month | Afternoon | Sea | Rain | Verdict |
|---|---|---|---|---|
| January | 31.1 °C | — | 2 days | Ideal — one of the best times of year |
| February | 32.2 °C | — | 4 days | Ideal — one of the best times of year |
| March | 33.8 °C | — | 10 days | Pleasant — a good time to go |
| April | 34.2 °C | — | 14 days | Possible, with trade-offs |
| May | 33.3 °C | — | 23 days | Unfavourable season |
| June | 32.5 °C | — | 22 days | Unfavourable season |
| July | 31.7 °C | — | 25 days | Unfavourable season |
| August | 31.7 °C | — | 25 days | Unfavourable season |
| September | 30.7 °C | — | 27 days | Unfavourable season |
| October | 30.4 °C | — | 23 days | Unfavourable season |
| November | 30.7 °C | — | 13 days | Pleasant — a good time to go |
| December | 30.2 °C | — | 4 days | Ideal — one of the best times of year |
Nearby in August
Before you go
Three things to check once you have picked your dates.
Entry
Visa issued on arrival for stays of up to 30 days. Passport valid for at least 6 months. E-visa (apply 4+ days ahead) or visa on arrival (photo, US dollars); e-Arrival Card mandatory within 7 days before flying in; tourist visa 30 days.
For a British passport, per the UK Foreign Office on 19 March 2026. Rules change: check before booking.
Safety
Outside the areas advised against
Parts of the country are advised against (within 20 km of the Thai land border (incl. Koh Kong and the Preah Vihear, Ta Krabey and Ta Muen Thom temples)); Siem Reap (Angkor) is not one of them.
Official advice updated 19 March 2026
Health
Vaccines · typhoid recommended for most travellers; hepatitis A and hepatitis B if you are not already vaccinated; rabies and Japanese encephalitis depending on activities and areas visited. Routine vaccines up to date (measles in particular).
Yellow fever · No yellow fever locally, vaccine not recommended. Certificate required only if you arrive from a country with yellow fever risk.
Malaria · Present. Areas: Primarily isolated to pockets in rural and forested areas Rare cases in non-forested areas No (or negligible) malaria transmission in the cities of Phnom Penh (the capital) and Siem Reap No (or negligible) malaria transmission at the main temple complex at Angkor Wat. Preventive medication recommended: Rural and forested areas: Atovaquone-proguanil, doxycycline, primaquine , tafenoquine Areas with rare cases: No chemoprophylaxis recommended (insect bite precautions and mosquito avoidance only) — prescribed before departure.
Mosquitoes · dengue and Zika reported: protect yourself from bites.
Per the CDC (page reviewed 25 August 2026); see a travel clinic a few weeks before departure.
Beau Fixe is not a safety or health authority. These notes summarise dated public texts and link to their source: France Diplomatie (Licence Ouverte 2.0), Foreign, Commonwealth & Development Office (gov.uk, Open Government Licence v3.0), Centers for Disease Control and Prevention (Source: CDC). Only the competent authorities are authoritative.
FAQ
Can you swim in Siem Reap (Angkor) in August?
Siem Reap (Angkor) is not a seaside destination (no sea data).
How hot is Siem Reap (Angkor) in August?
Expect 31.7°C in the afternoon and 25.4°C at night, averaged over the last 10 years.
Does it rain a lot in Siem Reap (Angkor) in August?
Around 25 days with rain (≥ 1 mm) in the month — 81% of days.