Cambodia Weather in September 2025, Where to Go and Travel Tips

September is a great time to visit Cambodia if you don't mind the heavy rain showers (often in the afternoon and or night). Tourist attractions are less crowded, hills are lush and green, and flights and accommodation are cheap. Read on for a useful description of typical weather in September in Cambodia, including average temperatures and rainfall, as well as travel tips on what to wear and best places to visit.

Cambodia Weather in September: Overview

• Average temperature range: 25–31°C (77–89°F)
• Average rainfall: 200–290 mm (8–12 inches)
• Average rainy days: 15–25
• Average sunny days: 5–10

It is quite hot and humid in September in Cambodia. The average minimum temperature is 25°C (77°F), while the average maximum is 31°C (89°F). The average amount of rainfall in Cambodia in September is a high 227 mm (10 in), but it is concentrated in downpours, well interspersed with 5–6 hours of sunshine per day on average.

Cambodia's Main City Weather in September

Phnom Penh and southern Cambodia: In Phnom Penh, the weather in September is very warm. The average minimum temperature is 24°C (75°F) and a maximum of 33°C (94°F). The average precipitation during this month is 270 mm (11 in), with more than 26 rainy days.

Battambang and Siem Reap: In Siem Reap (Angkor), the weather in September gets very warm. The average temperature is 29°C (84°F), with the average minimum temperature only falling to 26°C (79°F) and the daily maximum reaching 33°C (94°F) on average. In September, the average precipitation is 290 mm (12 in), with around 17 days of rainfall.

Coastal Cambodia and Sihanoukville: The weather in Sihanoukville gets very humid, though not as hot during this time of the year. The average temperature is 29°C (84°F), with the average minimum temperature at 25°C (77°F) and the average maximum reaching 31°C (89°F). The average precipitation in September is 320 mm (13 in), with the number of rainy days usually exceeding 23.

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The Best Places to Visit in Cambodia in September

September is a great month to travel to Cambodia if you are keen to avoid crowds and happy to take a chance with the rain, which often falls in the afternoon and night. Here are some of the recommended places to visit in September.

1. Angkor Wat

No matter when, Angkor Wat is a must-see destination for most guests traveling to Cambodia. The crowds are sparser in September, making it the best time for a relaxed tour. You can expect to see photogenic temples reflected in pools of water, glistening stone structures, and deep green vegetation. Take a moment to breathe in the fresh, rain-washed air in September.

2. Mahendraparvata for the Phnom Kulen Waterfalls

September is a good time to see the waterfalls of Cambodia. Cambodia is home to several breathtaking waterfalls, which are a delight to visit, especially during this rainy time of the year. Do consider venturing out to the Phnom Kulen Falls in the ancient city area of Mahendraparvata. This recently rediscovered city is symbolic to Cambodians, as it is believed that this was where the Khmer Empire began. Other waterfalls you can stop by include Teuk Chhou Waterfalls in Kampot and the famous Boo Sra Waterfall in Mondulkiri Province.

3. Tongle Sap Lake

September is a good time to visit Tonle Sap Lake (biggest lake in Cambodia) as the frequent and fierce rainfall makes the lake bigger and at its most vibrant. Many birdwatchers come to take photos at this time. Take a boat tour to visit the flooded forests and floating villages around Lake Tonle Sap and relax yourself by breathing the clean and fresh air after the downpours.

4. Kratie: Natural Beauty and Wildlife

The tropical province of Kratie turns completely green in September, like the rest of the dense northern jungle of Cambodia. The area encompassing Kratie boasts a variety of flora and fauna, especially in the huge nature reserves, where monkeys, different species of reptiles, and rare river dolphins can be spotted. Spend some time to visit the Mekong Turtle Conservation Center and Phnom Sambok Pagoda if you have more time.

5. Phnom Penh

The capital Phnom Penh should be on your list for a trip in September. There is so much waiting for you to explore in the capital of modern Cambodia and the ancient Khmer kingdom. There you can explore the Royal Palace complex to appreciate the beauty of the architecture and learn more about the history of Cambodia. Spend some time at the Killing Fields of Choeung Ek and Tuol Sleng Museum (notorious prison S-21) to feel the historical terror the nation suffered under Khmer Rouge rule.

Crowding and Costs in September

September is in the low tourist season because of constant rainfall, which makes it challenging to visit different destinations. For this reason, fewer tourists visit Cambodia this month, and most hotels offer good accommodation deals and bargains. All of Cambodia turns lush green, and the lakes expand in size due to the countrywide rise in water levels.

Clothes to Wear in September

Although September falls in the wet season, it is important to note that Cambodia is a hot and tropical country. Synthetic clothes have the benefit of being more quick-drying and breathable, but choose natural fabrics such as silk, cotton, and linen to keep you cool and comfortable when not so active. Loose-fitting light clothes such as long-sleeved shirts and trousers will help protect you from mosquito bites. As it tends to get warm or hot during the day and stay warm in the evenings, jeans would not be a good choice. As there is much rain during September, remember to pack a raincoat or poncho and a light pair of walking boots or shoes, depending on the activities you plan on engaging in.

Visit Cambodia with Asia Highlights

The month of September falls in Cambodia's wet season. Even with the rains, the mornings can get sunny and warm though sometimes the humidity levels drop, making the weather conditions comfortable for a morning tour.

As this is still the low tourism season, hotels and resorts offer low rates and special offers to tourists. We can help you plan a successful trip and design a custom vacation that best suits you.