Weather in Siem Reap in August 2025
Average weather
Average temperature in Siem Reap in August
Going from a maximum of +95°F during the day to a minimum of +79°F during the night, the temperature in August averages around +91°F.
The average maximum temperature goes down 33% by the end of the month, compared with the beginning of the month, from +90°F to +84°F.
Is Siem Reap warm or cold in August?
Siem Reap is typically hot in August.
Maximum temperatures go up compared to the previous month from +90°F to +90°F. The minimum temperature also goes up from +79°F to +79°F.
Make sure that you pack your summer linen and swimming costumes; it’s probably going to be hot.
Take a look at how August is compared to other months in Siem Reap:
Climate in Siem Reap in August
| July | August | September | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +90°F | +90°F | +88°F | ||||
| Min. temperature | ||||||
| +73°F | +75°F | +72°F | ||||
| Max. temperature | ||||||
| +100°F | +97°F | +97°F | ||||
| Rainfall | ||||||
| 138 mm | 155 mm | 253 mm | ||||
| Wind | ||||||
| 2 m/s | 2 m/s | 1 m/s | ||||
| Humidity | ||||||
| 78% | 79% | 83% | ||||
| Air pressure | ||||||
| 1006 HPa | 1006 HPa | 1007 HPa | ||||
| Sunny days | ||||||
| 0 | 0 | 0 | ||||
| Cloudy days | ||||||
| 2 | 2 | 1 | ||||
| Rainy days | ||||||
| 28 | 28 | 28 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
August weather is still as ok as in July. The temperature levels stay the same in the area of +90°F for average maximum temperature during the day. Prepare for more rain. Average rainfall goes from 138 mm to 155 mm. Humidity rises from 78% to 79%. The average wind speed doesn’t change much during August, staying around 2 m/s. The amount of sunny days stay about the same, averaging 0 sunny days during the month.
September brings much the same weather, it remains ok.
Wind
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 August, going from 2 m/s to 1 m/s over the course of the month.
Rain
How was the weather last August in Siem Reap?
Climate Change Over the Years
The climate in Siem Reap in August 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
Is August a good time to visit Siem Reap?
Can you sunbathe in Siem Reap in August?
Is Siem Reap rainy in August?
Is it sunny in Siem Reap in August?
Other cities in Cambodia
Monthly weather in Siem Reap
Source of the data
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.