Thailand Weather in April

April is the hottest month of the year in Thailand, with temperatures that can push past 45°C in direct sun. Wherever you're headed, staying hydrated and wearing sunblock isn't optional.

The North and Northeast run hot and dry, Central Thailand turns properly steamy, and the South mixes warmth with the odd shower. Songkran adds its own energy on top of all that, making April a genuinely different kind of trip compared to the rest of the year.

Here's what to expect by region:

• North Thailand (Chiang Mai, Chiang Rai): Hot and dry, 27°C to 38°C, with little rain but possible haze from agricultural burning
• North East Thailand (Udon Thani, Khon Kaen): Blazing heat, 28°C to 39°C, dry and clear
• Central Thailand (Bangkok, Ayutthaya): Very hot, 29°C to 38°C, high humidity, minimal rain
• South Thailand (Phuket, Krabi, Surat Thani): Warm and humid, 28°C to 34°C, sunny on the Andaman coast with occasional showers on the Gulf side

Songkran, also called the Water Festival, usually falls in mid-April, though the exact dates shift with the lunar calendar. Locals and visitors take to the streets splashing water at each other, a tradition meant to wash away the old year and start fresh.

Businesses often close for a few days, and many people extend the break with extra time off. Tourist areas stay lively through the celebrations, but administrative and business life across the country slows down while the New Year takes priority.

Between the Songkran crowds and the calm of Thailand's national parks, April gives you two very different kinds of trip depending on what you're after. Before you set off, our Thailand Transport Guide covers how to get between destinations once you're on the ground.

April is still one of the drier months, though the South starts showing early signs of the coming wet season, with showers picking up slightly. Most of the country stays sunny enough for Songkran and outdoor plans to go ahead as expected.

Yes, this is the hottest stretch of the year across the board. Daytime highs test your endurance almost everywhere, and while nights bring some relief, the heat rarely fully lets up.

The heat doesn't slow down Thailand's festival energy or its scenery. Here's where LUMA's own team would send you this month.

Chiang Mai: Top Pick for April, by Dr. Gerard

Dr. Gerard is LUMA's Chief Medical Officer and has lived in Thailand for over 30 years.

Chiang Mai's warm, dry weather sets up well for Songkran, and the celebrations here feel more local and family-friendly than Bangkok's higher-energy scene.

What to do: Wander the smaller streets away from the main roads for a more genuine take on the festival.

Dr. Gerard's tip: Chiang Mai's moat gives everyone easy access to water, which means water gun pressure gets serious here. A direct hit to the eyes can cause real damage, so wear swimming goggles if you're getting into it. If you do end up unwell during your trip, our guide on what to do if you get sick in Thailand without insurance walks through your options.

Surat Thani: Top Pick for April, by Petch

Petch is LUMA's Partner Development Manager and has spent over 10 years in travel and hospitality.

Songkran is worth experiencing, but Surat Thani's Khao Sok National Park offers a genuinely different kind of April trip, warm weather and the odd shower that only makes the rainforest look better.

What to do:

• Boat tour on Cheow Lan Lake: limestone cliffs, hidden caves, and calm turquoise water for swimming or kayaking
• Stay on floating bungalows: wake up to lake views without leaving the water
• Trek and spot wildlife: rainforest trails, caves, and waterfalls that are home to gibbons, wild cats, and elephants, ending at a strong viewpoint
• Visit an elephant sanctuary: an ethical, luxury jungle camp experience with the elephants

Petch's tip: Fly into Phuket or Krabi, then travel overland to Khao Sok. If you can, extend your stay past Songkran for a quieter, nature-focused finish, and pack lightweight rain gear for the occasional shower.

April blends festival chaos with genuinely good outdoor days, depending on which part of the country you pick. Pack light clothes, bring more sunscreen than you think you need, and plan around the heat rather than against it.