Thailand Hot Season: Best Islands, Weather Guide & Tips

Thailand in the hot season: weather, best islands, tips, and what to bring

Visiting Thailand during the hot season means warm weather and plenty of sunshine. This is when the country really heats up, and temperatures can get quite high. Still, there are plenty of beautiful spots where you can enjoy sun, sea, and relaxation. With the right preparation, you can travel comfortably and make the most of your holiday. In this article, you’ll find what to expect from the weather, which islands are best to visit, handy tips, and what to pack to get through the hottest season well.

When is the hot season in Thailand?

The hot season runs from March through May. The weather during this time is:

• Often between 33°C and 38°C during the day, sometimes even above 40°C
• Warm at night, around 25°C to 28°C
• Sea water temperatures between 29°C and 31°C
• Plenty of sunshine, averaging 8 to 10 hours per day
• Very little rain, usually less than 20 mm per month

What is the hottest month in Thailand?

April is usually the hottest month in Thailand. Temperatures often rise above 40°C, especially in cities like Bangkok and inland areas. April falls right in the middle of the hot season and is also when the popular Songkran festival takes place.

Bangkok, during the hot season:

• Daytime temperatures often range from 34°C to 38°C, sometimes higher
• Warm nights around 26°C to 28°C
• Lots of sun and little rain
• High humidity can make it feel quite muggy
• Sometimes smog builds up due to traffic and heat

Tip! Try to schedule your activities in the early morning or later in the day. Take regular breaks in cool or shaded areas and drink plenty of water.

Northern Thailand in hot season (e.g., Chiang Mai)

The north can be dry and dusty during the hot season:

• Daytime temperatures between 33°C and 37°C
• Night temperatures around 23°C to 26°C
• Dry air with little rain
• Smog from agricultural burning may occur

Best islands to visit during the hot season

Gulf of Thailand

• Koh Samui: Lots of sunshine, usually dry. Sea often calm. By May, a slightly higher chance of showers and light waves.
• Koh Phangan: Same as Samui: stable weather, calm sea. In May, occasional brief showers.
• Koh Tao: Often calm, clear water and plenty of sun. Late May, winds can pick up a bit, bringing small waves.

Eastern Gulf (Trat)

• Koh Chang: A few more showers than Samui, but still plenty of sun. Sea usually calm to slightly choppy; visibility can drop after rain.
• Koh Kood: Warm with lots of sunny spells, occasional brief showers. Sea generally calm to slightly choppy.
• Koh Mak: Similar to Koh Kood: sometimes a shower, often sunny. Sea usually calm, sometimes light waves.

Andaman Sea

• Phuket: March–April has lots of sun; by May you’ll notice more showers. Sea goes from calm to moderate, with extra swell as rainy season approaches.
• Krabi: Mostly sunny in March–April; May is more changeable. Sea light to moderately choppy.
• Koh Phi Phi: Often sunny, with a chance of brief showers. Sea light to moderate chop; visibility varies after rain.
• Koh Lanta: Fairly stable until late April; more showers in May. Sea usually calm to moderate, sometimes a bit more swell.

Trang Archipelago

• Koh Ngai: Plenty of sun in March–April; May is a bit more changeable. Sea usually calm to slightly choppy.
• Koh Mook: Warm and often sunny; later in the season a few more brief showers. Sea light to moderate chop.
• Koh Kradan: Sunny in March–April; May is more unsettled. Sea often calm, sometimes light waves.

Satun/Tarutao

• Koh Lipe: Sunny in March–April; showers increase in May. Sea calm to moderate; waves can pick up when it’s windy.
• Koh Adang/Rawi: Same pattern as Lipe: stable in March–April, more changeable in May.
• Koh Tarutao: Warm with lots of dry hours; more showers in May. Sea light to moderate chop.

Ranong

• Koh Phayam: Sunny in March–April; May brings more showers. Sea usually calm to slightly choppy.
• Koh Chang (Ranong): Similar to Phayam: plenty of sun until late April, then more changeable. Sea light to moderate chop.

Northern Gulf (Chumphon)

Chumphon islands: Often sunny and fairly stable in March–April; a local shower is possible. Sea usually calm; visibility generally good.

Advantages and disadvantages of traveling during the hot season

Advantages	Disadvantages
Lots of sunshine and little rain, perfect for the beach	It can get very hot, sometimes above 40°C (104°F)
Less crowded at popular tourist spots	High humidity and stuffiness
Warm sea water to cool off	Smog can reduce air quality, especially in northern Thailand and Bangkok
Often lower prices compared to peak season	Strenuous activities in the heat can be tiring
Great conditions for sunsets and clear skies, ideal for photography	The nature is less green and waterfalls may be dry

Songkran: Thai new year in the hot season

Songkran, the Thai New Year, takes place in mid-April right in the middle of the hot season. It’s one of Thailand’s biggest and most popular festivals. People all over the country celebrate with water fights to cool off from the heat. It’s a unique experience full of fun, music, and traditions you definitely don’t want to miss.

Tips for comfortable travel during the hot season

In Bangkok, it can get very hot, especially during the hot season when temperatures often reach 35°C (95°F) or higher. Of course, you want to see as much as possible during your trip, but keep the heat in mind. Relaxing on the beach under an umbrella with a cool drink and a swim in the sea or pool is very doable. However, a jungle trek or visiting the Grand Palace in the middle of the day can be tough, especially if you’re not used to such high temperatures. Listen to your body and take breaks, otherwise it can quickly become too intense.

• Choose a hotel with air conditioning.
• Avoid the hottest hours between 11:00 am and 3:00 pm; cool off by the pool or in the sea.
• Stay in the shade or under an umbrella when you’re outside.
• Drink plenty of water or other cool beverages.
• Plan intense activities early in the morning or later in the afternoon.
• Bring a UV protection umbrella when walking or visiting temples during midday. A sunshade can really make a big difference in how hot you feel. You’ll notice you’re definitely not the only one doing this!

What to pack for the hot season?

Here’s a handy packing list for your trip to Thailand during the hot season:

• Light, breathable clothing such as thin cotton.
• A wide-brimmed hat or cap for sun protection
• Sunscreen with a high SPF (at least 30)
• Electrolyte powder to prevent dehydration
• Cooling wipes or a small handheld fan for quick relief
• A small foldable UV protection umbrella.

Want more tips on what to pack for Thailand? Check out our personalized packing guide here.