Cambodia Phnom Penh Weather in August — Climate Guide
August in Phnom Penh is moderate
August is moderate for Phnom Penh.
August continues monsoon peak — rainfall 220mm + 19 rainy days. Days 32°C / 90°F + nights 25°C / 77°F. Mekong River reaches year's roughest waters. Korean Liberation Day weekend (Aug 15) drives a brief regional hotel + flight peak. Outside of that window, pricing stays similar to July — boutique $40-90/night. Korean summer break tail continues. This is the month most outdoor-focused travelers should skip. Pool + spa + cooking class + cultural temple visits in Royal Palace + wats still work, but Mekong cruises and outdoor walking have significant cancellation risk. For travelers timing-locked to summer break: stick to honeymoon-style on-property luxury at Raffles + Rosewood + Sofitel + Park Hyatt. For everyone else: skip August, visit November-February or late May.
Travel score
Monsoon peak continues + Korean summer break tail
August Weather at a Glance
August averages 90°F / 32°C highs and 77°F / 25°C lows with 19 rainy days and 220mm of rain. Humidity 82%. UV 10. Sunshine 6 hours (year's low with July). Mekong + Tonlé Sap at year's roughest.
August Travel Advice
Travel insurance with cancellation coverage absolutely essential. Plan city-based itinerary + skip Mekong cruise + outdoor day-trips. Korean Liberation Day (Aug 15) drives brief Korean inbound peak.
Flying In from Overseas
Korean summer break tail + Japanese O-Bon week + European peak holiday. Flights via Bangkok or Singapore $500-900. Korean Liberation Day (Aug 15) drives brief Korean inbound peak.
August Pricing Trends
Korean break + European peak: boutique $40-90/night, Raffles $260-510, Rosewood $240-450. Liberation Day weekend (Aug 15) slight peak. Flights $500-900 from East Asia.
Phnom Penh August Weather Stats
Avg High
32°C
Avg Low
25°C
Rainy Days
19
220mm total
Sunshine
6h
Daily avg
Humidity
82%
very humid
UV Index
10
Very high
Wind
9 km/h
Gusts 26
Sea Temp
29°C
Mekong River roughest
Crowds
Moderate
At attractions
August Sunrise & Sunset
Air Quality
PM2.5
25 μg/m³
PM10
42 μg/m³
Status
good
Feels-Like Temperature & Wind
Feels like
Daytime
37°C
Nighttime
27°C
Humidity and wind affect how the actual temperature feels.
Wind
9 km/h
Max gust 26 km/h
Activities Recommended for August
August Travel Pros & Cons
Pros
- Liberation Day weekend brief peak then drop
- Lush green landscape
- Hotel pool + spa indoor experience strong
Cons
- Continued monsoon peak
- Mekong cruise + outdoor cancellation risk
- Downtown flooding
August Events & Festivals
- Korean Liberation Day weekend (Aug 15) — brief regional peak
- Korean summer break tail
- Mekong River at year's roughest waters
- Pchum Ben preparations continue
Phnom Penh in August — Full Picture
August continues monsoon peak — rainfall 220mm + 19 rainy days. Days 32°C / 90°F + nights 25°C / 77°F. Mekong River reaches year's roughest waters. Korean Liberation Day weekend (Aug 15) drives a brief regional hotel + flight peak. Outside of that window, pricing stays similar to July — boutique $40-90/night. Korean summer break tail continues. This is the month most outdoor-focused travelers should skip. Pool + spa + cooking class + cultural temple visits in Royal Palace + wats still work, but Mekong cruises and outdoor walking have significant cancellation risk. For travelers timing-locked to summer break: stick to honeymoon-style on-property luxury at Raffles + Rosewood + Sofitel + Park Hyatt. For everyone else: skip August, visit November-February or late May.
What to Wear & What to Pack
Similar to July with continued heavy rain. Quick-dry + rain shell + waterproof bag mandatory. Days 32°C / 90°F + nights 25°C / 77°F.
Packing Checklist
Seasonal Weather Overview
Spring (Mar·Apr·May)
35°C
25°C
7.3/mo
Summer (Jun·Jul·Aug)
Current32.3°C
25°C
17.7/mo
Autumn (Sep·Oct·Nov)
31°C
23.7°C
15/mo
Winter (Dec·Jan·Feb)
31.3°C
22°C
1.7/mo
Phnom Penh Monthly Weather Comparison
| Month | High | Low | Rain | Sun | Humid | UV | Crowd | Price |
|---|---|---|---|---|---|---|---|---|
| January (Best) | 31° | 22° | 1d·10mm | 9h | 65% | 9 | Very busy | Peak |
| February (Best) | 33° | 23° | 1d·10mm | 9.5h | 60% | 10 | Very busy | Peak |
| 35° | 24° | 3d·35mm | 9h | 65% | 11 | Busy | Shoulder | |
| 36° | 26° | 6d·75mm | 8.5h | 70% | 12 | Busy | Peak | |
| 34° | 25° | 13d·145mm | 7.5h | 75% | 11 | Moderate | Shoulder | |
| 33° | 25° | 16d·200mm | 6.5h | 80% | 10 | Quiet | Low season | |
| 32° | 25° | 18d·220mm | 6h | 82% | 10 | Moderate | Shoulder | |
| 32° | 25° | 19d·220mm | 6h | 82% | 10 | Moderate | Shoulder | |
| 32° | 25° | 19d·250mm | 6h | 82% | 9 | Quiet | Low season | |
| 31° | 24° | 17d·240mm | 7h | 80% | 9 | Moderate | Low season | |
| November (Best) | 30° | 22° | 9d·100mm | 8h | 70% | 9 | Very busy | Peak |
| December (Best) | 30° | 21° | 3d·25mm | 9h | 65% | 9 | Busy | Peak |
View Other Months
Phnom Penh August Hotel Picks
Frequently Asked Questions
Is August a good time to visit Phnom Penh?
Phnom Penh in August is moderate. Tourist crowds are moderate and flight/hotel prices are shoulder.
What's the average temperature in Phnom Penh in August?
Phnom Penh August averages a high of 32°C and a low of 25°C.
Does it rain much in Phnom Penh in August?
Phnom Penh August averages 220mm of rainfall over about 19 rainy days.
What should I wear in Phnom Penh in August?
Similar to July with continued heavy rain. Quick-dry + rain shell + waterproof bag mandatory. Days 32°C / 90°F + nights 25°C / 77°F.
What time are sunrise and sunset in Phnom Penh in August?
Phnom Penh August sunrise is 05:55 and sunset is 18:20, with 12h 25min of daylight.
What's the air quality like in Phnom Penh in August?
Phnom Penh August air quality (AQI) averages 50, rated Good. PM2.5 averages 25μg/m³.
What activities are recommended in Phnom Penh in August?
In August, Phnom Penh is great for Hotel pool + spa, Cambodian cooking class, Indoor museums + colonial walks (morning).
Is August peak season in Phnom Penh?
Phnom Penh August crowds are moderate and prices are shoulder. You can travel relatively comfortably without long queues.
Best Months to Visit Phnom Penh
View Other Months
Why you can trust weather guide
Based in Chiang Mai for 8+ years, with 30+ countries visited across Southeast Asia, Japan, and Europe. Every detail in this guide is primary-source verified as of April 2026, with prices auto-refreshed via live exchange rate APIs. This isn't AI-generated boilerplate — it's written from the perspective of someone who has actually been there.