Weather Preah Sihanouk Today – Temperature, Rain & Hourly Forecast
Monday, 21/09/2026
- High/Low
- 27°/25°
- Humidity
- 91%
- Wind
- 14 km/h
- Rainfall
- 28.3 mm
- UV index
- 8.9
- Pressure
- 1013 hPa
- Sunrise
- 05:55
- Sunset
- 18:02
Today
Summary
Preah Sihanouk gets a cooler-than-usual day, 25–27°C, under thunderstorm.
Downpours near 00:00–00:00 (28.1 mm); localised flooding is possible.
Storms are forecast near 00:00–00:00.
UV peaks at 8.9 around 12:00 — stay out of the sun between 10am and 3pm and use sunscreen.
At 91% humidity it feels like 30°C.
Winds of 18 km/h from the north-west.
Temperatures hold steady near 27°C through the week.
The wettest day ahead is Thursday 24/09 with about 108 mm.
Sunrise 05:55, sunset 18:02.
Local climate notes
Sihanoukville takes the south-west monsoon straight off the Gulf of Thailand, so its wet season starts about two weeks earlier than inland and hits considerably harder — July to September can bring days of continuous rain rather than the afternoon showers typical of Phnom Penh. Seas are rough through this period and boats to Koh Rong are frequently cancelled. From November to April the wind reverses, the sea calms, and this becomes the peak season.
— Ban biên tập KhmerMeteo · Meteorological data editors
Best time to visit
48-hour forecast
Days ahead
| Today | Low/High | Chance of rain | Rainfall | |
|---|---|---|---|---|
| Today 21/09 | Thunderstorm | 25°27° | 99% | 28.3 mm |
| Tomorrow 22/09 | Thunderstorm | 25°28° | 97% | 29.4 mm |
| Wednesday 23/09 | Thunderstorm | 24°26° | 100% | 79.6 mm |
| Thursday 24/09 | Thunderstorm | 25°26° | 100% | 107.7 mm |
| Friday 25/09 | Light showers | 25°26° | 98% | 36.2 mm |
Monthly averages
Common questions
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Upstream rainfall · Cardamom coastal rivers
- Past 72 hours
- 55 mm
- Next 72 hours
- 148 mm
- Status
- High
- Water may arrive
- 25/09
| Upstream sampling points | Past 72 hours | Next 72 hours |
|---|---|---|
| Cardamom summit | 51 mm | 113 mm |
| Koh Kong | 36 mm | 184 mm |
| Bokor | 79 mm | 148 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
Preah Sihanouk
Sea & waves today
0.5 m · slight · period 4s · W
| 21/09 | 0.5 m | slight |
| 22/09 | 0.6 m | slight |
| 23/09 | 0.8 m | slight |