Siem Reap weather in September
Monthly temperatures, rain, humidity, what to wear and what to pack — 2024–2025 historical average
Siem Reap September weather at a glance
In September, Siem Reap averages 27.4°C, with typical highs of 31.5°C and lows of 24.8°C. The historical average is 29 wet days and 85% humidity.
Siem Reap September temperature & humidity
Siem Reap September rain & wet days
Pack a light rain jacket, waterproof pouch and quick-dry shoes. Keep an indoor stop available between outdoor activities.
What to wear in Siem Reap in September
Expect intense heat. Pack lightweight quick-dry clothing, sun protection and a refillable bottle. Rain is frequent at roughly 29 days in the month; pack a rain jacket and water-resistant shoes. High humidity makes quick-dry clothing and a spare top especially useful.
- DaytimeBreathable short sleeves, hat and sunscreen · average high 31.5°C
- Morning & eveningLight layer for air-conditioned rooms · average low 24.8°C
- FootwearComfortable walking shoes; quick-dry footwear for rainy days.
Packing essentials
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Siem Reap September sunrise & sunset times
2026 September · Local time (Asia/Phnom_Penh)
| Date | Sunrise | Sunset | Daylight |
|---|---|---|---|
| 2026-09-01 | 05:53 | 18:16 | 12h 23m |
| 2026-09-15 | 05:54 | 18:06 | 12h 12m |
| 2026-09-30 | 05:54 | 17:55 | 12h 1m |
For sunset photos, arrive before the listed sunset time. Clouds, mountains and buildings can change when the sun becomes visible or disappears.
Calculated for the city coordinates with daylight saving applied. SunCalc · tz-lookup
Siem Reap travel updates
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No public camera link is available for this destination yet. Check the weather or map instead.
Today’s weather and forecast
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Forecast · Windy. Monthly averages are in the Temperature section.
Siem Reap news search
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Siem Reap city map
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Siem Reap rainy season & dry season
Is September wet or dry?
The 2024–2025 average for September is 29 wet days.
2024–2025 wet-day averages, not long-term season boundaries. Wet days do not mean all-day rain.
Packing for rainy and dry periods
For rainy periods, bring a light rain jacket, a waterproof pouch and quick-dry clothes. In drier months, pack sunscreen and a hat, plus a compact umbrella for showers. For beach trips, check the boat operator’s weather and cancellation notices.
Siem Reap travel essentials
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Best months to visit Siem Reap
Bar height shows our simple weather-comfort score, not a safety rating; colour shows temperature.
September weather by year
Daily weather in 2025
Daily high and low temperatures; blue labels show precipitation
Frequently asked questions
What is Siem Reap weather like in September?
In September, Siem Reap averages 27.4°C, with typical highs of 31.5°C and lows of 24.8°C. The historical average is 29 wet days and 85% humidity. Our weather-comfort rating for this month is challenging.
Does it rain a lot in Siem Reap in September?
There are about 29 wet days in September. Pack a rain jacket and water-resistant shoes.
What should I wear in Siem Reap in September?
Expect intense heat. Pack lightweight quick-dry clothing, sun protection and a refillable bottle. Rain is frequent at roughly 29 days in the month; pack a rain jacket and water-resistant shoes. High humidity makes quick-dry clothing and a spare top especially useful.
What are the best months to visit Siem Reap?
Recent weather data rates January, February, December among the more comfortable months.
Where can I check Siem Reap weather in September in real time?
Check local webcams for the view right now and a local weather service for today’s forecast. Monthly temperatures here are historical averages.
Is September rainy or dry season in Siem Reap?
The 2024–2025 average for September is 29 wet days.
Which months have fewer rainy days in Siem Reap?
In our 2024–2025 data, January, February, December have the fewest wet days. These are recent observations, not long-term climate normals. Compare temperatures and your planned activities as well.
What time are sunrise and sunset in Siem Reap in September?
On 2026-09-15, calculated sunrise is 05:54 and sunset is 18:06 in local time (Asia/Phnom_Penh). Times vary by date and terrain.
Siem Reap weather by month
More Southeast Asia destinations in September
Open-Meteo (CC BY 4.0) · 2024–2025 historical data, aggregated and rounded by this site. Not a forecast or long-term climate normal. Calculation method and limitations