Weather in Phnom Penh in September
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Book now, pay at pickup — compare Hertz, Avis, Budget, Sixt and 800+ rental companies for September in Phnom Penh.
Compare car hire prices → Affiliate link — we earn a commission at no extra cost to youPhnom Penh in September is hot — daytime temperatures average 30.8°C, dropping to 24.9°C at night. The month is extremely wet, with heavy downpours most days, with roughly 7.6 hours of sunshine a day. This is peak season for good reason — conditions are close to ideal. For the complete picture, see the best time to visit Phnom Penh — every month compared. Once you know when to go, find your Phnom Penh packing list at 247PackingList.
Get ready for Phnom Penh in September
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Search Flights →Lightweight travel clothing
Lightweight, breathable clothing and a compact travel umbrella are essential in this climate.
Check Price →What to pack for Phnom Penh in September
- Lightweight, breathable clothing
- High SPF sunscreen
- Sunglasses
- Sun hat
- Reusable water bottle
- Compact travel umbrella
- Waterproof jacket
- Quick-dry clothing
Compare all months in Phnom Penh
| Month | High | Rain | Rating |
|---|---|---|---|
| January | 30.9°C | 22.2mm | 10/10 |
| February | 32.4°C | 26.1mm | 10/10 |
| March | 34.2°C | 39.5mm | 10/10 |
| April | 33.6°C | 121.7mm | 9/10 |
| May | 33.3°C | 190.1mm | 9/10 |
| June | 32.9°C | 167.4mm | 9/10 |
| July | 31.8°C | 228.8mm | 8/10 |
| August | 32.3°C | 250.5mm | 8/10 |
| September | 30.8°C | 338.9mm | 8/10 |
| October | 30.2°C | 382.8mm | 8/10 |
| November | 30.3°C | 224.5mm | 8/10 |
| December | 30.2°C | 33.6mm | 10/10 |
Full month-by-month guide: best time to visit Phnom Penh →
For facts about Cambodia — currency, language and dialling code — see our Cambodia country guide at 247CountryInfo. Travellers also find it useful to keep a Phnom Penh travel guide to hand. Check clothing sizes in Cambodia before you shop.
Frequently Asked Questions
Is September a good time to visit Phnom Penh?
September rates 8/10 for visiting Phnom Penh — good time to visit. Expect average highs of 30.8°C, 338.9mm of rain across the month and about 7.6 hours of daily sunshine.
What is the temperature in Phnom Penh in September?
In September, Phnom Penh has average highs of 30.8°C (87.4°F) and average lows of 24.9°C (76.8°F).
Does it rain in Phnom Penh in September?
Yes — September is one of the wetter months in Phnom Penh, averaging 338.9mm of rain over roughly 29 rainy days. Pack for heavy showers.
What should I wear in Phnom Penh in September?
For Phnom Penh in September (30.8°C highs / 24.9°C lows), pack lightweight, breathable clothing plus high spf sunscreen, sunglasses, sun hat.
More essentials for Phnom Penh in September
Packing cubes
Keep the bag organised whatever the weather — compression cubes for every size.
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Compact TSA-friendly kit for peace of mind wherever you travel.
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Climate data sourced from Open-Meteo (open source, open data licence). Monthly averages calculated from 2020–2023 historical data. Weather can be unpredictable — always check a live forecast before travelling.