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Sihanoukville Weather in September
Sihanoukville in September sees high daytime temperatures of 29°C (84°F) and nighttime lows of 26°C (79°F). As part of the rainy season, showers are frequent and often heavy. Budget around 571 mm (22 in) of rainfall for the month.
Rainfall in Sihanoukville in September
As part of the rainy season, Sihanoukville sees around 21 days of rain in September, with an average of 571 mm (22 in). The rain this month falls heavily when it arrives. Late afternoons in particular can see strong showers, so waterproofs are worth keeping handy.
Temperature in Sihanoukville in September
Sihanoukville in September gets highs of 29°C (84°F) during the day and drops to 26°C (79°F) at night. Conditions stay fairly consistent through the month, making it easier to plan what to wear. At 26°C (79°F) overnight, it stays warm after dark. Light, breathable clothing and good airflow in your room make a noticeable difference.
Sunshine in Sihanoukville in September
With about 148 hours of sunshine, the area enjoys a nice balance of sun and rainy moments, creating a pleasant environment.September in Sihanoukville can still be great, but if you prefer pleasant temperatures along with dry and sunny conditions, our weather planner can help you explore other options in the world.
Sihanoukville Temperature in September
Min Temperature
26°C (79°F)
Max Temperature
29°C (84°F)
Chance of Rain
69%
Precipitation
571 mm (22 in)
Rainy days
21 days
Sunshine
148 hours
Percentage Sunshine
Sihanoukville Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Sihanoukville - and find the best time to visit.
Daily Historical Temperatures
46-year average (1976-2025)
Based on our historical records, temperatures in Sihanoukville typically stay consistent throughout September, with daily highs averaging around 29°C (84°F). Nights are warm, with lows around 26°C (79°F).
Average temperatures in September
Daily Historical Precipitation
46-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather records for Sihanoukville in September
Browse day-by-day weather records for Sihanoukville spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Sihanoukville historical weather extremes in September
Based on 35 years of weather observations (1990-2025), these are the most extreme conditions recorded in Sihanoukville.
- The hottest September day on record in Sihanoukville reached 34°C (93°F) (September 24, 2010).
- On September 5, 1990, Sihanoukville saw its coldest September day with temperatures maxing out at 24°C (75°F).
- The coldest night in September in Sihanoukville was on September 18, 2020, with a minimum of 19°C (66°F).
- Peak precipitation in September occurred on September 23, 2006, when 301 mm (12 in) of precipitation was measured.
Best Places in Cambodia in September
Find out more about the weather in Cambodia and which places have the best travel conditions in this month. See all of Cambodia in September →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Sihanoukville in September
Warm but pleasant conditions in Sihanoukville in September. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. It's going to pour! Pack a good poncho and prepare for very wet conditions. Bring sunglasses since you'll have some sunny periods throughout the month
Sihanoukville 3-Day Forecast
More climate data for Sihanoukville
See the full Sihanoukville climate overview or explore weather in Cambodia.
Popular in September
Where to go in September - average daytime high across popular destinations.
Battambang
34°C (93°F) Phnom Penh33°C (91°F) Siem Reap33°C (91°F) Kep30°C (86°F) Chambok31°C (88°F) Koh Rong Island29°C (84°F) Kampot30°C (86°F) Sihanoukville29°C (84°F) Bucket list
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