Siem Reap in May
In May, Siem Reap averages 34°C (93°F) during the day and 25°C (77°F) at night, with around 11 days of rain (170 mm total).
Off-peakConditions are very hot — early-morning and evening sightseeing recommended. Plan for unsettled weather and bring rain gear.
May in Siem Reap is outside the typical sweet spot for sightseeing weather. It can still be a great time to visit if you have specific reasons (festivals, off-season pricing, etc.).
How May compares to the rest of the year in Siem Reap
May is one of the warmest months in Siem Reap (3rd of 12) and moderately rainy compared to the rest of the year (6th of 12). Daytime temperature runs 2°C above the annual average (33°C). May runs 1°C cooler than April (35°C) and cools 1°C in June (33°C).
May sunrise & sunset in Siem Reap
Times shown for Siem Reap local time (Asia/Phnom_Penh), calculated for the 15th of May. They shift by a few minutes day to day across the month.
Photography light in Siem Reap — May
Golden-hour and blue-hour windows for the 15th of May, in Siem Reap's local time. Use these for soft warm light (golden) or cool architectural twilight (blue).
📅 When to book — Siem Reap in May
Travel writers usually only tell you when to go. Here's when to book flights and lodging for the best mix of price and availability, based on May's tier (Off-peak) and Siem Reap's popularity.
Crowds & pricing — May in Siem Reap
This is off-peak for Siem Reap — the lowest prices of the year and the fewest crowds, but with real trade-offs: some restaurants, hotels, and beach businesses may close for the season; weather conditions can make outdoor activities unpredictable; and a handful of seasonal sights run reduced hours or close entirely. Great if you prefer a quiet local rhythm and don't mind the climate giving you reasons to choose indoor activities.
Why this tier: challenging tourism weather
Sun & mosquito risk — May in Siem Reap
UV is a clear-sky sea-level estimate — clouds, altitude, and reflective surfaces (snow, water) shift it ±30%. Mosquito risk is climate-derived only; for current disease advisories (dengue, malaria, zika) check the CDC or WHO travel pages before your trip.
Siem Reap in other months
| Month | Avg high | Avg low | Rainfall | Rain days | Snow days |
|---|---|---|---|---|---|
| January | 32°C / 90°F | 20°C / 68°F | 5 mm | 1 | 0 |
| February | 33°C / 91°F | 21°C / 70°F | 5 mm | 1 | 0 |
| March | 35°C / 95°F | 23°C / 73°F | 30 mm | 3 | 0 |
| April | 35°C / 95°F | 25°C / 77°F | 90 mm | 7 | 0 |
| May | 34°C / 93°F | 25°C / 77°F | 170 mm | 11 | 0 |
| June | 33°C / 91°F | 25°C / 77°F | 210 mm | 15 | 0 |
| July | 32°C / 90°F | 25°C / 77°F | 200 mm | 16 | 0 |
| August | 32°C / 90°F | 25°C / 77°F | 230 mm | 18 | 0 |
| September | 31°C / 88°F | 25°C / 77°F | 275 mm | 18 | 0 |
| October | 31°C / 88°F | 24°C / 75°F | 260 mm | 15 | 0 |
| November | 31°C / 88°F | 23°C / 73°F | 135 mm | 9 | 0 |
| December | 31°C / 88°F | 21°C / 70°F | 30 mm | 3 | 0 |
Other cities with similar May weather
🌍 See the full ranked list of climate twins for Siem Reap in May →
Frequently asked questions
How hot is Siem Reap in May?
In May, Siem Reap averages a high of 34°C (93°F) and a low of 25°C (77°F) — generally hot.
Does it rain a lot in Siem Reap in May?
May can be fairly wet in Siem Reap, with about 11 rainy days on average.
Is May a good time to visit Siem Reap?
May is hot. It suits travelers who are comfortable with hot weather; check the month-by-month ranking to compare it against the rest of the year.
What should I pack for Siem Reap in May?
Pack lightweight, breathable clothing, sunglasses and sunscreen, plus a compact umbrella or rain jacket. See the full May packing list for Siem Reap for a complete, climate-based checklist.
Check the live 10-day forecast and sunrise/sunset.