Monthly climate guide
Siem Reap weather in May
Expect very hot weather in Siem Reap in May: afternoons reach about 35°C (94°F), while nights drop to around 26°C (79°F). Around 114 mm of rain falls over the month (wet), and skies are often cloudy. Daytime highs are about the same as April and 3°C warmer than June.
What stands out in May
- Even after dark it stays around 26°C, so sleeping can feel warm.
- It's humid — around 72% — so the heat feels heavier.
- Siem Reap is usually about 3°C warmer than Kampot, 310 km away, in May.
Avg high
35°C
94°F
Avg low
26°C
79°F
Rainfall
114 mm
wet
Humidity
72%
relative
Sky
84%
cloud · often cloudy
Siem Reap weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 34°C / 93°F | 21°C / 70°F | 12 mm | 57% | 47% |
| February | 36°C / 97°F | 23°C / 73°F | 9 mm | 51% | 35% |
| March | 37°C / 99°F | 26°C / 78°F | 38 mm | 55% | 61% |
| April | 36°C / 97°F | 26°C / 79°F | 62 mm | 63% | 75% |
| May | 35°C / 94°F | 26°C / 79°F | 114 mm | 72% | 84% |
| June | 32°C / 90°F | 25°C / 77°F | 173 mm | 81% | 87% |
| July | 31°C / 87°F | 24°C / 76°F | 187 mm | 85% | 89% |
| August | 31°C / 88°F | 24°C / 76°F | 185 mm | 85% | 91% |
| September | 31°C / 87°F | 24°C / 76°F | 232 mm | 86% | 91% |
| October | 31°C / 88°F | 24°C / 75°F | 148 mm | 83% | 76% |
| November | 32°C / 90°F | 23°C / 73°F | 42 mm | 78% | 66% |
| December | 32°C / 90°F | 21°C / 69°F | 7 mm | 66% | 55% |
What to pack for May
- Light, breathable clothing (cotton or linen)
- A sun hat and high-SPF sunscreen
- A refillable water bottle
- A compact umbrella or packable rain jacket
- Water-resistant shoes
Is May a good time to visit Siem Reap?
Compare the months in the chart above to find your ideal window.
Best time to visit Siem Reap →Other Cambodia cities in May
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Siem Reap weather in May. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/cambodia/siem-reap/may
<a href="https://weathercompare.eu/weather/cambodia/siem-reap/may">Siem Reap weather in May</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/cambodia/siem-reap" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Siem Reap weather in May"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/cambodia/siem-reap/may">Siem Reap weather in May</a> – WeatherCompare</p>
Siem Reap in May: quick answers
Is May a good time to visit Siem Reap?
It can be, if you like heat: May highs in Siem Reap are around 35°C. Good for the beach; plan sightseeing for early morning and evening.
How warm is Siem Reap in May?
Average highs are about 35°C (94°F) and average lows about 26°C (79°F), based on 10 years of daily data.
Does it rain a lot in Siem Reap in May?
Siem Reap typically gets around 114 mm of rain in May — wet.
Figures are long-term averages for the area around Siem Reap (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.