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Thailand Weather

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Located in the middle of the Indochina Peninsula, most parts of Thailand have a typical tropical monsoon climate. The mountains in the north block the invasion of cold air to the south, making Thailand climate hot all year round, with little temperature difference. Under the influence of the tropical monsoon, Thailand weather can be divided into three seasons throughout the year: the hot season (March to mid-May), the rainy season (June to mid-October) and the cool season (November to February).

The average annual temperature in Thailand is about 28°C (82.4°F), with occasional highs of 40°C (104°F) or more. The north and northeast of Thailand are mainly mountainous and highland, where the temperature is lower at night. Southern Thailand, lying in the northern part of the Malay Peninsula, is hilly, featuring a typical tropical rainforest climate.

The best time to visit Thailand is during the cool season from November to February, when the skies are clear and the climate is cool, perfect for outdoor sightseeing. April is the hottest month in Thailand, with an average temperature of about 32°C (89.6°F). June is the beginning of the rainy season with heavy rains lasting until October. Rainfall during this period will peak in September, with 80% humidity. Thailand has an average annual rainfall of 1,100 mm (43.3 inches) and an average humidity of 66%-82%.

Thailand Seasons - Temperature & Clothing Guide

Hot Season (March to mid-May)

As the cold season comes to an end, temperatures in Thailand begin to rise gradually in March. The temperature variation during the hot season is most significant in northern Thailand, where places such as Chiang Mai experience temperatures in the 23-35°C (73.4-95°F) range. There is relatively little rainfall in the hot season.

You are advised to bring some breathable, loose clothing. March is also a good time to visit Thailand. The beaches and islands of the south are good destinations. Don’t forget your sunscreen.

Rainy Season (June to mid-October)

June marks the start of the rainy season in Thailand, which lasts until October. The southwest monsoon brings moisture from the Indian Ocean, giving Thailand plenty of rain during this period. It’s not the hottest time of the year, but the humid, hot air makes traveling extremely uncomfortable. According to statistics, 80% of Thailand’s annual rainfall is concentrated in these months.

If you travel to Thailand during the rainy season, you should wear quick-drying clothes, especially if you are hiking, biking, or doing other outdoor activities. Also, pack a pair of waterproof shoes. A poncho or umbrella is necessary. Thai countryside in the rainy season is at its most beautiful, like a green kingdom.

Cool Season (November to February)

Even in the cool season, the weather in Thailand is warm. The Northeast monsoon, which brings cool, dry air and reduces rainfall, is the peak time for travel to Thailand. Average temperatures in Thailand range from 19 to 26°C (66.2-78.8°F) during the cool season, which is perfect for exploring most places in Thailand, including Relaxing by the beach or pool of the west coast, venturing into the jungle, and visiting temples and historic sites. The east coast such as Koh Samui with constant rain in the cool season is not recommended.

You are suggested to wear long-sleeved T-shirts, light blouses and trousers. If you plan to hike in Chiang Mai, cardigan and hiking shoes are a must.

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