Preah Sihanouk Climate by Month – Rainy Season, Temperature Averages
Summary
The climate figures for Preah Sihanouk are averaged from 2016–2025 observations (10 years). Annual rainfall averages about 3,207 mm.
The rainy season runs April–November. The wettest month is July with 531.1 mm across 30 rain days; the driest is February at just 53.9 mm.
The hottest month is April (average high 31.3°C) and the coolest is September (28.4°C).
The most comfortable time to visit Preah Sihanouk is February — less rain and milder heat.
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
Monthly averages · 2016–2025
| Monthly averages | High | Low | Rainfall | Rainy season |
|---|---|---|---|---|
| January | 29.9° | 23.8° | 69 mm | 13 |
| February | 30.4° | 23.9° | 54 mm | 15 |
| March | 30.9° | 24.8° | 87 mm | 19 |
| April | 31.3° | 25.6° | 133 mm | 22 |
| May | 30.5° | 25.9° | 310 mm | 30 |
| June | 29.3° | 25.6° | 387 mm | 28 |
| July | 28.7° | 25.1° | 531 mm | 30 |
| August | 28.7° | 25.1° | 456 mm | 30 |
| September | 28.4° | 24.8° | 512 mm | 29 |
| October | 29.1° | 24.5° | 412 mm | 28 |
| November | 30.1° | 24.6° | 178 mm | 21 |
| December | 30.2° | 24.2° | 77 mm | 12 |