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Siem Reap Weather in September
During September, Siem Reap experiences very high daytime temperatures of 33°C (91°F) and cooler nights around 26°C (79°F). As the wettest month of the year, expect frequent rainfall.
Rainfall in Siem Reap in September
As part of the rainy season, Siem Reap sees around 18 days of rain in September, with an average of 286 mm (11 in). Rain during the rainy season here tends to be intense rather than just persistent drizzle. Expect significant downpours, often in the late afternoon.
Temperature in Siem Reap in September
September in Siem Reap brings very high temperatures, with highs of 33°C (91°F) and nights around 26°C (79°F). Mornings and evenings are often more comfortable than the peak afternoon hours. With lows around 26°C (79°F), the nights are warm enough that a sheet is usually all you need for bedding.Our weather planner can help you find worldwide destinations with pleasant weather during this period. December typically offers the best weather for Siem Reap.
Siem Reap Temperature in September
Min Temperature
26°C (79°F)
Max Temperature
33°C (91°F)
Chance of Rain
59%
Precipitation
286 mm (11 in)
Rainy days
18 days
Humidity
75%
Siem Reap Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Siem Reap - and find the best time to visit.
Historical weather records for Siem Reap in September
Browse day-by-day weather records for Siem Reap spanning 34 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Siem Reap historical weather extremes in September
Based on 20 years of weather observations (2006-2026), these are the most extreme conditions recorded in Siem Reap.
- The warmest day in September was on September 3, 2026, with a maximum of 34°C (93°F).
- Siem Reap experienced its chilliest September day on September 3, 2019, reaching only 26°C (79°F).
- The coldest night in September in Siem Reap was on September 22, 2009, with a minimum of 23°C (73°F).
- The wettest September day on record brought 61 mm (2.4 in) of precipitation to Siem Reap (September 30, 2009).
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 Siem Reap in September
Warm but pleasant conditions in Siem Reap 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.
What To Do in Siem Reap in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Cycling7/10 -
Walking7/10 -
Camping7/10 -
Outdoor sports7/10
Siem Reap 3-Day Forecast
More climate data for Siem Reap
See the full Siem Reap 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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