Weather Siem Reap Today – Temperature, Rain & Hourly Forecast
Thursday, 05/11/2026
- High/Low
- 31°/24°
- Humidity
- 72%
- Wind
- 6 km/h
- Rainfall
- 6.4 mm
- UV index
- 7.7
- Pressure
- 1013 hPa
- Sunrise
- 06:00
- Sunset
- 17:36
Today
Summary
Siem Reap holds at 24–31°C through the day, with thunderstorm.
Expect rain near 12:00–17:00 totalling 6.2 mm.
Storms are forecast near 12:00–17:00.
UV peaks at 7.7 around 12:00 — wear a hat for longer stints outdoors.
At 72% humidity it feels like 37°C.
Winds of 14 km/h from the east.
Temperatures hold steady near 31°C through the week.
The wettest day ahead is Wednesday 11/11 with about 8 mm.
Sunrise 06:00, sunset 17:36.
Local climate notes
Siem Reap is roughly 15% drier than Phnom Penh over the year but has a wider day-night temperature range because it sits further from the sea. For Angkor visitors, November to February is the window: dawn can drop to 18–20°C, cool enough to walk the temple complex for hours. In April the sandstone surface temperature can exceed 45°C at midday, which is why most itineraries split into an early-morning and a late-afternoon session.
— Ban biên tập KhmerMeteo · Meteorological data editors
Best time to visit
48-hour forecast
Days ahead
| Today | Low/High | Chance of rain | Rainfall | |
|---|---|---|---|---|
| Today 05/11 | Thunderstorm | 24°31° | 82% | 6.4 mm |
| Tomorrow 06/11 | Drizzle | 24°31° | 45% | 1.8 mm |
| Saturday 07/11 | Drizzle | 24°32° | 57% | 2.4 mm |
| Sunday 08/11 | Light showers | 23°32° | 53% | 2.8 mm |
| Monday 09/11 | Light showers | 23°32° | 55% | 4.5 mm |
Monthly averages
Common questions
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Upstream rainfall · Tonlé Sap
- Past 72 hours
- 25 mm
- Next 72 hours
- 19 mm
- Status
- Slightly elevated
- Water may arrive
- 07/11
| Upstream sampling points | Past 72 hours | Next 72 hours |
|---|---|---|
| Kampong Thom | 23 mm | 15 mm |
| Battambang | 26 mm | 34 mm |
| Pursat | 13 mm | 13 mm |
| Siem Reap | 20 mm | 12 mm |
| Cardamom highlands | 42 mm | 20 mm |
This measures upstream rainfall, not river level. Official levels and discharge come from the Mekong River Commission (MRC). Upstream rainfall causes the level, and is visible several days earlier. MRC
Upstream rainfall · Stung Sen and Stung Sreng
- Past 72 hours
- 12 mm
- Next 72 hours
- 13 mm
- Status
- Normal
- Water may arrive
- 07/11
| Upstream sampling points | Past 72 hours | Next 72 hours |
|---|---|---|
| Preah Vihear | 12 mm | 10 mm |
| Oddar Meanchey | 13 mm | 10 mm |
| Dangrek range | 11 mm | 19 mm |
This measures upstream rainfall, not river level. Official levels and discharge come from the Mekong River Commission (MRC). Upstream rainfall causes the level, and is visible several days earlier. MRC
Tonlé Sap
The Mekong has dropped below the lake, the flow reverses a second time and water starts draining out. Mature fish move out with it, which is why this is the main fishing season. Bon Om Touk celebrates exactly this moment.
Mekong basin rainfall: 6 mm over the past 72 hours, 8 mm forecast for the next 72.
This is a seasonal estimate combined with basin rainfall, not a measured level. Official water level and discharge come from the Mekong River Commission (MRC). The timing of the reversal varies year to year and has shifted noticeably over the past two decades.
Why the lake reverses