If you plan to visit Siem Reap in September, the weather is typically alright, with an average high temperature of +88°F during the day and approximately 0 sunny days. Expect some rainy, though, as there are typically 28 rainy days in the month and around 253 mm of precipitation. The weather is changeable so you may have to pack for every eventuality. Search flightsin one click on Avionero.
Average weather
☀️
+88°F
Avg. max. temperature
+72°F
Min.
+97°F
Max.
253 mm
Total precipitation
83%
Avg. humidity
1 m/s
Avg. wind
0 ☀️
Sunny Days
1 ⛅️
Cloudy
28 🌦
Rainy
Our opinion: Siem Reap has OK weather in September.
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Average temperature in Siem Reap in September
Here are the expected maximum, average and minimum temperatures in Siem Reap for September based on the historical data.
Last Year
Historical Data
Going from a maximum of +91°F during the day to a minimum of +77°F during the night, the temperature in September averages around +88°F.
The average maximum temperature goes up 13% by the end of the month, compared with the beginning of the month, from +88°F to +90°F.
Is Siem Reap warm or cold in September?
Siem Reap is typically hot in September.
Maximum temperatures go down compared to the previous month from +90°F to +88°F. The minimum temperature also goes down from +79°F to +77°F.
Make sure that you pack your summer linen and swimming costumes; it’s probably going to be hot.
September is one of the coolest months in Siem Reap, here is the comparison with other months:
Climate in Siem Reap in September
Siem Reap weather looks like this, on average, in September and the surrounding months.
August
September
October
Avg. temperature
+90°F
+88°F
+88°F
Min. temperature
+75°F
+72°F
+66°F
Max. temperature
+97°F
+97°F
+93°F
Rainfall
155 mm
253 mm
232 mm
Wind
2 m/s
1 m/s
1 m/s
Humidity
79%
83%
83%
Air pressure
1006 HPa
1007 HPa
1009 HPa
Sunny days
0
0
0
Cloudy days
2
1
4
Rainy days
28
28
26
Snowy days
0
0
0
September weather is still as ok as in August.It’s getting colder in September. From +90°F in the day, the average maximum temperature lowers to +88°F.Prepare for more rain. Average rainfall goes from 155 mm to 253 mm.Humidity rises from 79% to 83%.Winds are calmer in comparison to August, going down from 2 m/s to 1 m/s on average.The amount of sunny days stay about the same, averaging 0 sunny days during the month.
October brings much the same weather, it remains ok.
Wind speed in Siem Reap in September based on historical data.
Last Year
Historical Data
The average wind speed is 2 m/s getting up to 3 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Siem Reap is gradually decreasing during September, going from 2 m/s to 1 m/s over the course of the month.
Rain
Amount of rainfall in mm during September in Siem Reap based on historical data.
Last Year
Historical Data
Typically, there is a 93% chance of rain on an average day in September, with total rainfall of approximately 290 mm. The maximum amount of rainfall per day is around 21 mm, which is considered light rain.September is a pretty wet month with over 28 rainy days, so don’t forget to pack an umbrella, raincoat, and a pair of wellies.
September is one of the rainiest months in Siem Reap, here is a comparison with other months, total mm:
Siem Reap wettest month is September, where a typical day has a 93% chance of precipitation and 253 mm of rainfall per day. January, on the other hand, is the driest month with a mere 16% chance of precipitation and 9 mm of rainfall per day.
How was the weather last September in Siem Reap?
This is the weather in Siem Reap in September 2023:
1 September
🌧️
+88°F
2 September
🌧️
+89°F
3 September
🌧️
+91°F
4 September
🌧️
+92°F
5 September
🌧️
+88°F
6 September
☁️
+87°F
7 September
☁️
+90°F
8 September
☁️
+91°F
9 September
🌧️
+89°F
10 September
🌧️
+86°F
11 September
☁️
+88°F
12 September
🌧️
+88°F
13 September
🌧️
+87°F
14 September
🌧️
+87°F
15 September
🌧️
+84°F
16 September
☁️
+88°F
17 September
🌧️
+87°F
18 September
🌧️
+86°F
19 September
🌧️
+90°F
20 September
☁️
+90°F
21 September
☁️
+84°F
22 September
☁️
+89°F
23 September
☁️
+90°F
24 September
☁️
+90°F
25 September
🌧️
+89°F
26 September
🌧️
+86°F
27 September
🌧️
+87°F
28 September
🌧️
+86°F
29 September
🌧️
+90°F
30 September
☁️
+89°F
In September 2023 Siem Reap had 0 sunny days, 11 cloudy days, and 19 rainy days. The average maximum temperature was +88°F, with an absolute maximum of +91°F and a minimum of +84°F. The average humidity was 87%, with a maximum of 100% and a minimum of 70%. The average wind speed was 2 m/s, with a maximum of 7 m/s and a minimum of 0 m/s.
Are you planning a trip in September?
Climate Change Over the Years
This is how Siem Reap climate has changed over the last 43 years.
The climate in Siem Reap in September has not changed that much over the last 43 years.
The average temperature was the lowest in 1999 (+88°F) and the highest in 2015 (+92°F). The driest year was 2015 with only 880 mm of rainfall, and the wettest year was 1999 with 1854 mm.
FAQ
Frequently asked questions about the weather in Siem Reap in September:
Is September a good time to visit Siem Reap?
It’s always a good time to visit Siem Reap, but the weather is changeable in September, so plan a mix of indoor and outdoor activities and exploring, and pack for every eventuality.
Can you sunbathe in Siem Reap in September?
Absolutely, September is hot in Siem Reap. Plan on beach and pool time, and ensure that you pack light and breathable options to stay comfortable.
Is Siem Reap rainy in September?
Siem Reap is often rainy in September. You may get a bit damp when outside, so pack an umbrella, and maybe even a raincoat.
Is it sunny in Siem Reap in September?
Usually, it’s not very sunny in Siem Reap in September, often it’s pretty cloudy. Pack for any eventuality; layering can help reduce the number of bulky items needed.
Other cities in Cambodia
Check out the weather for other cities in Cambodia.
For this page, we’ve looked at the typical weather in Siem Reap, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.
