Thailand Weather in August 2025: Travel Tips for First Visitors

Thailand Weather in August: Overview

In August, Thailand experiences its peak rainfall, accompanied by slightly lower temperatures (average temperature: 26-32 °C) yet persistently high humidity levels. 

This period is considered the low travel season. Despite the rain, travelers can fully immerse themselves in the lush landscapes and cultural richness while benefiting from the lower tourist numbers characteristic of this off-peak season.

• Average temperature range: 26–32°C (79–89°F)
• Average rainfall: 219 mm (9 inches)
• Rainy days: 18–23
• Sunny days: 5

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Thailand's Regional Weather

Bangkok and Northern Thailand: The average temperature in Bangkok is about 30°C (86°F) in August, making for hot days despite the rain. Rainfall in Bangkok and Central Thailand increases slightly in August compared to July, building towards its September monsoon peak.

Chiang Mai and Northern Thailand: In August, Northern Thailand receives the most rainfall of the year, especially in Chiang Mai. Heavy downpours with strong winds are expected; however, the rainy weather also helps cool down temperatures in Chiang Mai. The average temperature in Chiang Mai in August goes is 27°C (80°F). Chiang Rai has similar weather.

Southern Thailand: Most of the southern islands experience monsoonal weather during August. The tropical monsoons bring heavy rainfall, especially in Koh Chang, which is southwest of Bangkok. The average precipitation there is an enormous 495 mm (19 in) in August!

On the west peninsula coast, Phuket, Krabi, Koh Phi Phi, Koh Lanta, Similan Islands, and Trang Islands also experience high rainfall, as their very high rainfall months of September and October approaches.

However, the east coast islands of Koh Samui, Koh Pha-ngan, and Koh Tao are relatively well protected from the southwest monsoon. If you are looking for an island on which you can spend your holiday in August, these are ideal choices, as the rainfall there is only moderate/low.

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The Best Places to Visit in Thailand in August

In August, despite the rainy season in Thailand, there are still enticing destinations to explore. Here are some top places to visit:

• Bangkok: The capital city offers indoor attractions like temples, museums, and shopping malls. Embrace the cultural richness and diverse cuisine while staying dry from occasional rain.
• Chiang Mai: Despite the rain, Chiang Mai's cultural charm persists. Explore temples, engage in monk chats, attend a cooking class, and savor local delicacies. The lush landscapes during the wet season add to the city's allure.
• Ayutthaya: Visit the historical ruins of Ayutthaya, where the rain can bring a unique charm to the ancient monuments. The thinner crowds during this period provide a more tranquil experience.
• Koh Samui: The lack of heavy rainfall makes Koh Samui a perfect destination for your trip to Thailand in August. Koh Samui's romantic vibe, stunning landscapes, luxury resorts, and crystal waters make it shine among Thailand's numerous islands.
• Phuket: Despite being the rainy season, Phuket can still be enjoyable in August. Take advantage of lower accommodation prices and explore the vibrant nightlife.
• Khao Sok National Park: Venture into the lush rainforest of Khao Sok National Park. While August brings rain, the vibrant greenery and potential wildlife sightings make it a unique and captivating experience for nature enthusiasts. Engage in jungle walks and explore the park's diverse ecosystem amidst the rainforest backdrop.

More Helpful Information:

• How to Plan Your First Trip to Thailand — 7 Easy Steps 
• Check the sample itineraries for Thailand tours: 10 days, 14 days, and 21 days >>>

Crowding and Costs in August

August is a good time to travel to Thailand if you don't mind its heat and frequent rainy days. It is easy to book a discounted room in branded hotels and find great deals on outdoor activities. The tourist sites and beaches are quiet and empty, which is a definite benefit compared to the high season.

Clothes to Wear in August

August is still quite hot in most of Thailand. Shorts, skirts, T-shirts, light trousers, and caps are recommended, if you are packing for Thailand in August. It rains quite often in this month. So, remember to take umbrellas, light raincoats, and rubber boots or sandals for outdoor activities.

Traveling to Thailand in August? Check out These Great Itineraries

These are some sample itineraries for your inspiration and they can be customized based on your interests and requirements. Or check more our Southeast Asia tours. 

Monthly Weather and Travel Information for Thailand

Learn about the weather in Thailand for 12 months and find out the best places to visit each month.