Is Thailand worth visiting in May despite the rain?

Yes, for the right traveller. The Gulf coast (Koh Samui, Koh Phangan, Koh Tao) stays largely dry and offers excellent value. Even on the Andaman coast, rain usually arrives in afternoon or evening bursts rather than all-day downpours — mornings are often fine for beach activities. The lush green landscape, empty beaches, and low prices make May appealing for budget-conscious and off-season travellers.

Does it rain all day in Thailand during the monsoon?

Rarely. Monsoon rain in Thailand typically arrives as intense afternoon or evening thunderstorms lasting 30 minutes to 2 hours. Mornings are often clear and sunny. Prolonged all-day rain is unusual except during major storm systems. The Gulf coast experiences a different monsoon pattern and may have extended periods of unsettled weather from October to December instead.

Monthly Travel Guide

Thailand in May

May is the start of the low season for most of Thailand. The southwest monsoon arrives, bringing rains to the Andaman coast and Central regions. However, the Gulf coast (Koh Samui, Koh Phangan, Koh Tao) remains largely dry and sunny — a great opportunity for value travel. Prices drop 30–50% from peak season, crowds thin considerably, and the landscape turns lush and green. For adventurous travellers comfortable with some rain, May offers exceptional value.

Weather by Region

North (Chiang Mai)

Hot with early monsoon rains arriving. Chiang Mai 27–36°C. Haze from burning has fully cleared — air quality improves dramatically. Green season begins.

Central (Bangkok)

Wet season begins. Bangkok sees regular afternoon thunderstorms. Temperatures 28–35°C. Rain is usually intense but brief.

South — Gulf Coast

Mostly dry and excellent. Koh Samui and Koh Phangan benefit from being sheltered from the southwest monsoon. Calm seas and warm water.

South — Andaman Coast

Monsoon arriving. Phuket and Krabi see increasing rainfall and rough seas. Some dive operators suspend liveaboard operations. Similan Islands National Park closes.

Best Destinations in May

Koh Tao

Gulf side stays dry; warm, calm waters are perfect for diving and snorkelling.

Koh Phangan

Low-season prices with good beach weather — one of the best value months of the year.

Chiang Mai

Haze has cleared, temperatures are cooling slightly, and the rice fields are beginning to green up.

Where to Avoid in May

Phuket

Monsoon rains and rough seas make beach activities limited; red flags close many beaches.

Koh Phi Phi

Southwest monsoon brings rough seas; ferry services can be disrupted.

Festivals & Events

Visakha Bucha Day

Full moon of May (Buddhist calendar)

The holiest day in the Buddhist calendar, commemorating the birth, enlightenment, and death of the Buddha. Candle-lit processions (wian tian) take place at all major temples. A public holiday — alcohol sales restricted.

Royal Ploughing Ceremony

Early May

An ancient Brahmin-Buddhist royal ritual held at Sanam Luang in Bangkok, traditionally marking the start of the rice-growing season. The ceremony predicts the coming year's harvest.

Frequently Asked Questions