Weather in Thailand in August 2025: First-Timers’ Travel Tips

August falls in the middle of the rainy season (June–October), with widespread rainfall, especially in the north and along the Andaman Coast.

Don't imagine endless gray skies; most days are hot and humid, around 32°C (90°F), with brief afternoon or evening rain. You might see a couple of wet days in a row if a storm system passes, so it helps to keep your itinerary flexible.

The reward? Fewer crowds and off-season prices. By late August, even popular spots feel calmer as European holidays wind down.

What's the Weather Like in Thailand in August?

Northern Thailand (Chiang Mai, Chiang Rai, Pai)

In August, the north is at its peak monsoon. Chiang Rai and Pai get some of the highest rainfall totals (over 200 mm), but you can also expect lush landscapes, full waterfalls, and cooler nights.

Chiang Mai, Lampang, and Sukhothai are a bit drier. You can visit temples, historical ruins, and cultural sites without much disruption. Families with teens or adult kids can still enjoy light outdoor activities. Just plan around short showers.

Central Thailand (Bangkok, Ayutthaya, Hua Hin, Kanchanaburi)

Central Thailand is the hottest region in August, with average highs around 33°C (91.4°F). Bangkok can feel very warm, but riverside Kanchanaburi and the mountains of Khao Yai offer a cooler escape.

It is also drier than most other parts of the country. Bangkok averages 128 mm of rain with around 17 rainy days—often short storms at night.

Along the central Gulf, Hua Hin is even drier with just 103 mm, making it a great coastal retreat for local expats in Bangkok. The big exception is Trat, Thailand's wettest province, which soaks up to 570 mm in August.

Southern Thailand—The Andaman Coast (Phuket, Krabi, Koh Lanta, Khao Lak)

In August, Phuket, Krabi, and other islands along the Andaman Sea are the wettest parts of Thailand. Rainfall ranges from 250–300 mm. Khao Sok, further inland, is a bit drier at around 200 mm.

As the windiest time of year, August isn't the best month for island-hopping. Boat trips often get canceled, and popular spots like the Similan and Surin Islands or Maya Bay in Phi Phi are off-limits.

The weather shifts quickly. Sunshine, overcast skies, and even a few days of steady rain can all happen in August. If August is your only option, plan a flexible itinerary, prioritize relaxing at your hotel or resort, and treat any beach or boat activities as a bonus if the weather allows.

Southern Thailand—Gulf of Thailand (Koh Samui, Koh Phangan, Koh Tao)

For postcard-perfect beaches in August, the Gulf of Thailand is your best bet. Koh Samui stands out, with only about 126 mm of rain.

Koh Phangan is a solid runner-up, but Koh Tao—famous for diving—can be tricky this month since choppy seas often make underwater trips less appealing.

Best Places to Go in Thailand in August

For August travel, we recommend the drier destinations as follows:

For most first-timers, a classic 10-day route is Bangkok + Chiang Mai + an island. If time allows, add in lesser-visited destinations like Kanchanaburi or Sukhothai.

• Bangkok for Thailand's iconic temples, palaces, buzzing street life, and the perfect gateway to the rest of Thailand.
• Chiang Mai for light outdoor activities, elephant encounters, and immersive cultural experiences.
• Koh Samui for beach downtime with great weather
• Kanchanaburi for waterfalls, floating bungalows, and World War II sites.
• Sukhothai for UNESCO-listed ruins with the most peaceful vibe

You could read further about the top things to do in each city in August, or check them out directly at our 12-day family tour.

Best things to do in Bangkok in August

• Sunny windows: Sunset dinner by the river facing Wat Arun (perfect for couples); private longtail boat ride through the canals for families—kids love feeding fish along the way.
• Rainy hours: SEA LIFE Bangkok or Museum Siam for family-friendly indoor time; couples can try a massage workshop together or catch a thrilling Muay Thai match at night.

Best things to do in Chiang Mai in August

• Sunny windows: join in early-morning almsgiving as locals, meet elephants at the Elephant Jungle Sanctuary or hike the Ang Ka Trail on Doi Inthanon, and climb the Sticky Waterfall with your teens
• Rainy hours: Cook Thai dishes in a traditional house, join chanting at Doi Suthep, or meet the long-neck Karen people. Unwind with a traditional Thai massage or enjoy afternoon tea overlooking the rice fields.

Best things to do in Koh Samui in August

• Sunny windows: Lounge on Chaweng Noi or Choeng Mon, snorkel off Koh Phangan with the kids, sail into sunset on a private yacht with your partner, and save a clear day for Ang Thong Marine Park's emerald lagoons.
• Rainy hours: Samui's spa culture makes stormy afternoons a treat—think coconut oil massages for couples, steam caves or cooking classes for families, or a visit to Wat Plai Laem with its striking 18-armed statue.

Best things to do in Kanchanaburi in August

• Sunny windows: Swim under the tiers of Erawan Falls, spend a night in a floating bungalow on the River Kwai (great fun for families), or take a bamboo raft ride. Couples may prefer a private riverside dinner surrounded by jungle.
• Rainy hours: Take a train ride along the Death Railway, and visit the JEATH War Museum, or explore Hellfire Pass for a moving look at WWII history—mostly indoor.

Best things to do in Sukothai in August

• Sunny windows: Cycle between ancient temples in the Historical Park, where soft light after showers makes the Buddha statues glow—families can rent an e-buggy to cover more ground, while couples may enjoy a private photography walk.
• Rainy hours: Duck into the Ramkhamhaeng National Museum to connect the dots of the Sukhothai kingdom, or join a traditional pottery workshop in a local village.

For a more detailed plan, you can explore our customizable itineraries or find additional tips for planning a trip to Thailand.

What to Wear in August

• Light, breathable clothing: Think quick-dry fabrics, shorts, and airy tops.
• Rain gear: A compact umbrella works double duty—rain protection and shade. Ponchos are handy, especially if you're on a scooter.
• Waterproof shoes or sandals: Streets in Bangkok or Phuket can flood quickly after a downpour.
• Swimwear: Beaches and hotel pools are always in play when the sun is out.

Is It Crowded in Thailand in August?

Not at all. August sits in the middle. It's busier than September or October because of European and Asian school holidays, especially on Koh Samui, but still far quieter than the winter peak (Nov–Feb).

So, travelling in August, you won't be shoulder-to-shoulder at temples or beaches, flights and hotels usually cost 20–30% less, and it's way easier to lock in those boutique stays or family villas. Restaurants and activities? Almost never an issue.

Honestly, many travelers prefer August—it feels calmer than winter and saves money. To give you an idea, our 12-day family tour runs about US$2,769 per person in August, which means a family of four pockets around US$600 in savings compared to peak season.

FAQ: Thailand Weather in August

Is August a good time to visit Thailand?

Yes—if you don't mind some rain. Although it is one of the wettest months, many travelers (including us) still enjoy sunny days with only brief showers. You'll get cheaper deals and a more relaxed vibe compared to peak season (Nov–Feb).

Does it rain a lot in Thailand in August?

Expect rain for 17–20 days, mostly in the afternoon or evening, so sightseeing is rarely disrupted. If you prefer minimal rain, stick to drier places, like Koh Samui or Bangkok.

Which is better, August or September?

• If you want less rain, choose August. It is still raining, but you could have more sunshine for outdoor activities.
• If you prefer the quietest attractions and the lowest prices, choose September. Because the peak of rainfall keeps most travelers away and summer holidays are over.

What are the best and worst months to visit Thailand?

• Best: weather-wise, November–February (cool and dry); cost-wise, June to August.
• Worst: September and October, when rainfall peaks nationwide. March is the hottest.

Temperatures and Rainfall in Thai Cities (August Averages)

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.