Weather in Siem Reap in September
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Compare car hire prices → Affiliate link — we earn a commission at no extra cost to youIn September, Siem Reap sees average highs of 30.3°C (86.5°F) and lows of 24.3°C. Conditions are hot and extremely wet, with heavy downpours most days, with roughly 6.8 hours of sunshine a day. It is one of the best months of the year to visit. For the complete picture, see the best time to visit Siem Reap — every month compared. Once you know when to go, find your Siem Reap packing list at 247PackingList.
Get ready for Siem Reap 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 Siem Reap 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 Siem Reap
| Month | High | Rain | Rating |
|---|---|---|---|
| January | 31.0°C | 31.1mm | 10/10 |
| February | 32.7°C | 36.1mm | 10/10 |
| March | 34.6°C | 47.5mm | 10/10 |
| April | 33.6°C | 156.1mm | 9/10 |
| May | 33.1°C | 227.2mm | 8/10 |
| June | 32.9°C | 162.3mm | 9/10 |
| July | 31.7°C | 268.7mm | 8/10 |
| August | 31.7°C | 237.6mm | 8/10 |
| September | 30.3°C | 396.0mm | 8/10 |
| October | 30.0°C | 309.8mm | 8/10 |
| November | 30.2°C | 132.1mm | 9/10 |
| December | 29.8°C | 28.9mm | 10/10 |
Full month-by-month guide: best time to visit Siem Reap →
For facts about Cambodia — currency, language and dialling code — see our Cambodia country guide at 247CountryInfo. Travellers also find it useful to keep a Siem Reap travel guide to hand. Check clothing sizes in Cambodia before you shop.
Frequently Asked Questions
Is September a good time to visit Siem Reap?
September rates 8/10 for visiting Siem Reap — good time to visit. Expect average highs of 30.3°C, 396.0mm of rain across the month and about 6.8 hours of daily sunshine.
What is the temperature in Siem Reap in September?
In September, Siem Reap has average highs of 30.3°C (86.5°F) and average lows of 24.3°C (75.7°F).
Does it rain in Siem Reap in September?
Yes — September is one of the wetter months in Siem Reap, averaging 396.0mm of rain over roughly 29 rainy days. Pack for heavy showers.
What should I wear in Siem Reap in September?
For Siem Reap in September (30.3°C highs / 24.3°C lows), pack lightweight, breathable clothing plus high spf sunscreen, sunglasses, sun hat.
More essentials for Siem Reap in September
Packing cubes
Keep the bag organised whatever the weather — compression cubes for every size.
Check Price →Travel first aid kit
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.