Siem Reap weather in August

In August, Siem Reap sees average daytime highs of 32°C and overnight lows near 26°C, with 162 mm of rain across 24.4 wet days and about 12.4 hours of daylight. It is the 7th-warmest and 3rd-wettest month of the year here.

Day-to-day highs hold fairly steady near 32°C through the month. The sky is clear or mostly clear about 2% of the time in August, and the air most often feels miserable.

Daylight stretches from about 12 h 36 min at the start of August to 12 h 18 min by month's end. Set against the rest of the year, August is Siem Reap's 12th-clearest and 2nd-windiest month. For the whole year in context, see Siem Reap's year-round climate.

Daytime high
32°
7th warmest
Overnight low
26°
8th coldest
Rainfall
162 mm
24.4 wet days
Daylight
12 h 24 min
5:55 AM – 6:22 PM
Cloud cover
89%
12th clearest
Wind
10 km/h
2nd windiest
Solar energy
5 kWh/m²
Travel score
2.4
out of 10

Siem Reap is capital of the same named Cambodian province.

Founded
~802 CE

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 32°C through the month.

A typical August day in Siem Reap reaches about 32°C in the afternoon and slips back to 26°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 30°C and 34°C. Set against its neighbours, August runs on par with July and about 1°C warmer than September.

25°28°30°33°35°151015202531
Avg high (°C)Avg low (°C)
13226
23226
33226
43226
53226
63226
73226
83226
93226
103226
113226
123226
133226
143226
153226
163226
173226
183226
193226
203226
213226
223226
233226
243226
253226
263226
273226
283226
293226
303226
313226

How August really feels in Siem Reap

Once humidity and wind are folded in, August averages 31 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
31
31 feel dangerously hot (≥ 39°C)
Days feeling ≤ C
0
wind chill below the day's low

The story in August is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Siem Reap weather by month

How August compares with the rest of the year at a glance. August is the 7th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan31° / 23°91.911.35.5
Feb33° / 24°132.611.64.5
Mar34° / 26°527.811.93.2
Apr35° / 27°9413.512.32.5
May34° / 27°14821.412.62.2
Jun33° / 27°13220.712.82.4
Jul32° / 27°13522.112.72.6
Aug32° / 26°16224.412.42.4
Sep31° / 26°24425.912.12.5
Oct31° / 25°22423.311.73.1
Nov31° / 24°628.811.44.7
Dec30° / 23°162.911.25.7

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 2% of the time in August, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 5% of August, with mostly cloudy or overcast conditions the remaining 93%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
1694
2694
3694
4694
5694
6694
7793
8793
9793
10793
11892
12892
13892
14892
15892
16892
17991
18991
19892
20892
21892
22892
23892
24793
25793
26793
27793
28694
29694
30694
31694

Chance of precipitation in August

Any precipitation

Siem Reap gets around 162 mm of rain over 24.4 wet days in August. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 78% and peaks near 83% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%151015202531
Rain chance (%)
174
274
374
475
575
675
775
875
975
1076
1176
1276
1377
1477
1578
1678
1779
1879
1980
2080
2181
2281
2382
2482
2583
2683
2783
2883
2983
3082
3182

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

Most of August feels miserable — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, August lands in the miserable band about 79% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Oppressive (%)Miserable (%)
13070
22971
32971
42971
52872
62872
72872
82773
92773
102674
112674
122575
132476
142476
152377
162278
172179
182080
191981
201882
211783
221684
231585
241486
251387
261288
271288
281189
291189
301189
311090

Wind in August

Winds average 10 km/h in August.

Across August, daily wind ranges from about 9 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
111calm
211calm
311calm
411calm
511calm
611calm
711calm
811calm
911calm
1011calm
1111calm
1211calm
1311calm
1411calm
1511calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
249calm
259calm
269calm
279calm
289calm
299calm
309calm
319calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 12 h 36 min at the start of August to 12 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 18 minutes over August. Sunrise moves from 5:53 AM to 5:56 AM, and sunset from 6:29 PM to 6:13 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.65:536:29
212.65:536:28
312.65:536:28
412.65:536:28
512.65:536:27
612.65:546:27
712.55:546:26
812.55:546:26
912.55:546:26
1012.55:546:25
1112.55:556:25
1212.55:556:24
1312.55:556:24
1412.55:556:23
1512.55:556:23
1612.45:556:22
1712.45:556:22
1812.45:556:21
1912.45:566:20
2012.45:566:20
2112.45:566:19
2212.45:566:19
2312.45:566:18
2412.45:566:17
2512.35:566:17
2612.35:566:16
2712.35:566:15
2812.35:566:15
2912.35:566:14
3012.35:566:13
3112.35:566:13

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 5 kWh/m².

For context, solar energy here swings from a low near 4.62 kWh/m² to a high of 6.16 kWh/m² in April across the year — August's 5 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
14.9Bright
24.9Bright
34.9Bright
44.9Bright
54.9Bright
64.9Bright
75.0Bright
85.0Bright
95.0Bright
105.0Bright
115.0Bright
125.0Bright
135.1Bright
145.1Bright
155.1Bright
165.1Bright
175.1Bright
185.1Bright
195.1Bright
205.1Bright
215.1Bright
225.1Bright
235.0Bright
245.0Bright
255.0Bright
265.0Bright
275.0Bright
285.0Bright
295.0Bright
305.0Bright
314.9Bright
Planning a trip in August

Hazard calendar for Siem Reap

In seasonPeak

In August, Siem Reap sits inside its pacific typhoon and rainy season season. The full year is below, with each hazard's peak months called out.

Siem Reap sits in the Pacific typhoon belt; the season peaks July–October.

Siem Reap's rainy season runs May–October, when most of the year's rain falls.

Pacific typhoon
Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is August a good time to visit Siem Reap?

Our two travel scores rate August for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

2.4
Sightseeing
10th-best month of the year
4.1
Beach & pool
11th-best month of the year

August is a weaker month for outdoor sightseeing in Siem Reap.

What to pack for Siem Reap in August

From August's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In August, Siem Reap sees daytime highs around 32°C and nights near 26°C. Pack light clothes and rain gear. Worth having: sun protection. About 24 days see rain.

light clothesrain gearsun protection

UV index in Siem Reap in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 14 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Siem Reap peaks around August 16 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near November 22 at about 8 (very high).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highAug 16UV 14Nov 22UV 8
UV index (midday)Level
Jan10Very high
Feb10Very high
Mar12Extreme
Apr12Extreme
May11Extreme
Jun12Extreme
Jul13Extreme
Aug14Extreme
Sep12Extreme
Oct11Extreme
Nov8Very high
Dec8Very high

Air quality in Siem Reap in August

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where August falls, not just the annual average.

Air quality in Siem Reap is worst in February — around 40 µg/m³ PM2.5 (poor), about 2.9× the cleanest month (November, 14 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0204060JanFebMarAprMayJunJulAugSepOctNovDecModeratePoorModerateFeb 2240 µg/m³Nov 2214 µg/m³
PM2.5 (µg/m³)Level
Jan29Moderate
Feb40Poor
Mar40Poor
Apr37Poor
May19Moderate
Jun15Moderate
Jul16Moderate
Aug15Moderate
Sep15Moderate
Oct17Moderate
Nov14Moderate
Dec14Moderate
Location & terrain

Where is Siem Reap?

Siem Reap sits at 13.4°N, 103.9°E, 18 m above sea level, in Cambodia. The nearest listed city is Yeang, 34 km away.

YeangPhum Ânlŭng VĭlBattambangPhumĭ TnaôtPursatSamraongSisophonAnlong Veaeng

Topography around Siem Reap

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Siem Reap.

Within 3 km, the terrain around Siem Reap has only modest variations in elevation — a maximum elevation change of 28 m around an average of 17 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 123 m; within 80 km, significant variations in elevation — a maximum elevation change of 484 m.

The land around Siem Reap is covered by artificial surfaces (60%) and trees (24%) within 3 km, cropland (45%) and trees (30%) within 16 km, and cropland (48%) and trees (30%) within 80 km.

3 km
28 m
16 km
123 m
80 km
484 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
August weather nearby: Yeang 34 km · Phum Ânlŭng Vĭl 74 km · Battambang 77 km · Phumĭ Tnaôt 89 km · Pursat 92 km · Samraong 98 km · Sisophon 99 km · Anlong Veaeng 100 km

Cambodia travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type A / C / G
230 V · 50 Hz
Prices
≈ 34% of US
price level, 2025
GDP per capita
$2,872
2025
Happiness
4.5 / 10
World Happiness, 2025
Safe drinking water
30%
of population, 2024
Homicide rate
1.8
per 100k, 2011
Road deaths
19.6
per 100k/yr, 2019
Income group
Lower middle
World Bank
English
Very low
EF EPI 390
Religion
Buddhist 97%Muslim 2%other 1%Christian 0%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Siem Reap (13.3618°, 103.8606°, elevation 18 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).