Thailand Weather in May marks the beginning of the rainy season, but that doesn’t mean it’s a bad time to visit. While there are occasional downpours, they are usually short-lived, and the country remains warm and vibrant. Travelers who visit Thailand in May can enjoy fewer crowds, discounted rates on accommodations, and lush, green landscapes. Here’s a detailed guide on what to expect from Thailand’s weather in May, the best places to visit, and tips for making the most of your trip.
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Thailand Weather in May
Temperature Overview
May is a hot and humid month in Thailand, with temperatures ranging between 26°C and 36°C (79°F to 97°F) across different regions. The heat can feel more intense due to high humidity levels, especially in cities like Bangkok.
| Region | Temperature Range (°C) | Temperature Range (°F) |
|---|---|---|
| Bangkok & Central Thailand | 27°C – 36°C | 81°F – 97°F |
| Northern Thailand (Chiang Mai, Chiang Rai) | 24°C – 35°C | 75°F – 95°F |
| Southern Thailand (Phuket, Krabi, Koh Samui) | 26°C – 34°C | 79°F – 93°F |
Rainfall & Humidity
- May sees an increase in rainfall, particularly in the second half of the month, with tropical showers occurring mostly in the afternoons or evenings.
- The average rainfall varies by region:
- Bangkok: ~190mm
- Chiang Mai: ~170mm
- Phuket: ~300mm
- Koh Samui: ~130mm (one of the driest places in May)
- Humidity levels are high, often exceeding 75%, which can make it feel even hotter.
Central Thailand (Bangkok, Ayutthaya, Kanchanaburi, Hua Hin, Pattaya)
Temperature & Humidity
| Parameter | Range |
|---|---|
| Daytime Temperature | 30°C – 36°C (86°F – 97°F) |
| Nighttime Temperature | 26°C – 28°C (79°F – 82°F) |
| Humidity Levels | 75% – 85% |
Rainfall & Weather Patterns
- Rainfall begins to increase, with Bangkok receiving around 190mm of rain throughout the month.
- Rain showers are usually brief but heavy, occurring in the afternoon or evening.
- Thunderstorms are common, but they clear up quickly, allowing for normal activities.
- The mornings and early afternoons remain hot and sunny on most days.
Best Places to Visit in Central Thailand in May
- Bangkok: Indoor attractions like malls (Siam Paragon, MBK, IconSiam) and cultural sites like the Grand Palace and Wat Arun are great options.
- Ayutthaya: Early morning visits to the ancient ruins are preferable before it gets too hot.
- Kanchanaburi: The riverside scenery and waterfalls at Erawan National Park are lush and beautiful after the early monsoon showers.
- Hua Hin & Pattaya: These coastal destinations receive less rain than the islands in the Andaman Sea, making them a decent option for a beach getaway.
Also Read: Thailand Weather in June
Northern Thailand (Chiang Mai, Chiang Rai, Pai, Sukhothai)
Temperature & Humidity
| Parameter | Range |
|---|---|
| Daytime Temperature | 27°C – 35°C (81°F – 95°F) |
| Nighttime Temperature | 22°C – 25°C (72°F – 77°F) |
| Humidity Levels | 70% – 80% (slightly lower than Bangkok) |
Rainfall & Weather Patterns
- The north starts seeing more frequent showers, with Chiang Mai receiving about 170mm of rain in May.
- Storms occur in the late afternoon, cooling the temperature but increasing humidity.
- The surrounding mountains and forests become lush, making the region perfect for nature lovers.
- Occasional flooding can occur in low-lying areas after intense storms, but it’s usually not a major issue.
Best Places to Visit in Northern Thailand in May
- Chiang Mai: The city remains an excellent cultural destination, with fewer tourists and beautiful greenery at sites like Doi Suthep.
- Chiang Rai: The White Temple (Wat Rong Khun) and the Golden Triangle region are scenic and great for photography.
- Pai: The countryside looks stunning after rainfall, with waterfalls and hot springs being ideal spots for relaxation.
- Sukhothai: The UNESCO-listed ruins are best explored early in the morning before the heat intensifies.
Northeastern Thailand (Isaan – Udon Thani, Khon Kaen, Nakhon Ratchasima, Buriram)
Temperature & Humidity
| Parameter | Range |
|---|---|
| Daytime Temperature | 29°C – 37°C (84°F – 99°F) |
| Nighttime Temperature | 24°C – 27°C (75°F – 81°F) |
| Humidity Levels | 65% – 75% (slightly drier than the central and southern regions) |
Rainfall & Weather Patterns
- Moderate rainfall (about 150mm – 180mm) occurs across the Isaan region, but storms are less intense than in Bangkok or the southern provinces.
- Rain tends to come in short, intense bursts, usually in the evening.
- The region remains hot and dry for most of the day, making it a challenging time for outdoor exploration.
Best Places to Visit in Northeastern Thailand in May
- Phanom Rung Historical Park (Buriram): The ancient Khmer ruins are a fascinating historical site, with fewer crowds in May.
- Red Lotus Lake (Udon Thani): The lake looks beautiful with blooming flowers, though mornings are the best time to visit due to the heat.
- Khao Yai National Park: This UNESCO-listed park sees increased wildlife activity, and the waterfalls are fuller after some early monsoon rains.
Eastern Thailand (Koh Chang, Koh Samet, Trat, Rayong)
Temperature & Humidity
| Parameter | Range |
|---|---|
| Daytime Temperature | 28°C – 34°C (82°F – 93°F) |
| Nighttime Temperature | 25°C – 27°C (77°F – 81°F) |
| Humidity Levels | 75% – 85% |
Rainfall & Weather Patterns
- Heavy rains begin to arrive, especially in late May, with Koh Chang receiving over 300mm of rainfall.
- Rain is usually short-lived but intense, especially in the afternoons.
- Koh Samet remains relatively dry compared to other islands, making it a good beach option.
Best Places to Visit in Eastern Thailand in May
- Koh Samet: One of the driest islands in Thailand during May, making it a great alternative to rainier destinations.
- Trat & Rayong: These coastal provinces are quieter and still offer decent beach weather in early May.
- Koh Chang: While beautiful, it experiences heavy rain, so visits should be planned accordingly.
Also Read: Thailand Weather in July
Southern Thailand (Koh Samui, Koh Phangan, Koh Tao)
Temperature & Humidity
| Parameter | Range |
|---|---|
| Daytime Temperature | 26°C – 34°C (79°F – 93°F) |
| Nighttime Temperature | 25°C – 27°C (77°F – 81°F) |
| Humidity Levels | 70% – 80% |
Rainfall & Weather Patterns
- This side of Thailand is drier in May, making it the best beach destination during this time.
- Koh Samui receives around 130mm of rainfall, but showers are typically short and happen at night.
- Koh Phangan and Koh Tao have similar conditions, making them great choices for snorkeling and diving.
Best Places to Visit in May
- Koh Samui: The best beach destination with minimal rain and excellent beach resorts.
- Koh Phangan: Famous for the Full Moon Party, which takes place monthly.
- Koh Tao: A top diving and snorkeling destination with clear waters.
Andaman Sea Side (Phuket, Krabi, Koh Phi Phi, Koh Lanta, Khao Lak)
Temperature & Humidity
- Daytime temperature: 27°C – 33°C (81°F – 91°F)
- Nighttime temperature: 25°C – 27°C (77°F – 81°F)
- Humidity levels: 80% – 90%
Rainfall & Weather Patterns
- Heavier rains and rough seas start in May, especially in Phuket and Krabi.
- The region receives 250mm – 350mm of rainfall, with frequent afternoon thunderstorms.
- Beaches may experience strong waves, making water activities riskier.
Best Places to Visit in May
- Phuket: Not ideal, but still manageable if you’re focusing on nightlife and shopping.
- Krabi & Koh Phi Phi: Can be rainy, so be prepared for weather-related disruptions.
- Koh Lanta & Khao Lak: Quieter, but many resorts close during the rainy season.
Festivals & Events in Thailand in May
Royal Ploughing Ceremony (Mid-May, Bangkok)
Held at Sanam Luang, this ancient ceremony marks the beginning of the rice-growing season. It’s an important cultural event attended by members of the royal family.
Visakha Bucha Day (Buddha Day, Nationwide)
A major Buddhist holiday that commemorates the birth, enlightenment, and passing of the Buddha. It’s a day of merit-making, with temples across Thailand filled with worshippers.
Full Moon Party (Koh Phangan, Monthly Event)
May’s Full Moon Party on Haad Rin Beach is an exciting event for partygoers. It’s a mix of music, fire shows, and beach dancing until sunrise.
Travel Tips for Visiting Thailand in May
Pack Light and Breathable Clothing
- Due to the heat and humidity, wear lightweight cotton clothes, sunscreen, sunglasses, and a wide-brimmed hat.
Carry an Umbrella or Rain Jacket
- Afternoon showers are common, so always have rain gear handy.
Stay Hydrated
- Drink plenty of water to avoid dehydration, especially if exploring outdoor attractions.
Plan Activities Around the Weather
- Sightseeing in the morning or late afternoon when it’s cooler.
- Visit malls, museums, and indoor attractions during peak heat.
Choose the Right Beaches
- Stick to Gulf of Thailand beaches (Koh Samui, Koh Phangan, Koh Tao) for better weather.
Be Prepared for Travel Disruptions
- Heavy rains can cause flight or ferry delays, so keep some flexibility in your itinerary.
Conclusion
Thailand Weather in May brings a mix of warm temperatures, high humidity, and occasional afternoon showers, marking the start of the rainy season. While some regions like Phuket and Krabi receive heavier rainfall, destinations such as Koh Samui, Koh Phangan, and Koh Tao remain relatively dry, making them the best beach options.
The rain is usually short-lived, allowing travelers to enjoy outdoor activities in the morning and explore indoor attractions later in the day. With fewer tourists and lower travel costs, May is a great time for budget-friendly travel and a more relaxed experience. By planning wisely and choosing the right destinations, you can still enjoy a fantastic trip filled with cultural sights, nature adventures, and Thai hospitality.
Also Read: Thailand Weather in August
Frequently Asked Questions
Is May a good time to visit Thailand?
Yes, May is a good time to visit Thailand if you don’t mind occasional rain and high humidity. The crowds are smaller, and hotels and flights are more affordable. For the best experience, visit the Gulf of Thailand islands (Koh Samui, Koh Phangan, Koh Tao), as they receive less rainfall.
Does it rain all day in Thailand in May?
No, rain in May usually comes in short, intense bursts—often in the late afternoon or evening. Mornings and early afternoons are typically sunny and humid, making it possible to explore before the rain starts.
What is the hottest part of Thailand in May?
The central and northeastern regions (Bangkok, Ayutthaya, Isaan) are among the hottest, with temperatures reaching 35°C – 37°C (95°F – 99°F). High humidity makes it feel even warmer.
Which part of Thailand has the best weather in May?
The Gulf of Thailand islands (Koh Samui, Koh Phangan, and Koh Tao) have the best weather in May. They receive less rain than other beach destinations like Phuket and Krabi, making them ideal for a beach vacation.
Is Thailand too humid in May?
Yes, Thailand is very humid in May, with humidity levels often exceeding 75% – 85%. The heat combined with humidity can feel uncomfortable, so staying hydrated and wearing lightweight clothing is essential.
Is Thailand cheaper to visit in May?
Yes! May is part of the shoulder season, meaning hotels, flights, and tours are cheaper compared to peak season (November – April). You can find great deals on accommodations and activities.