What is the weather like in Thailand? Thailand enjoys a tropical climate with 3 distinct seasons - summer from March through May, rainy with plenty of sunshine from June to September and cool from October through February. The average annual temperature is 28 C (83 F), ranging, in Bangkok, for example, from 30 C in April to 25 C in December.

When is the best time to visit Bangkok? December to February are the best months to visit as it is relatively cool and usually dry. April is the hottest month and September the peak of the wet season. Floods are usual at the start of the wet season in May and in October when the water is at its highest.

Average Days of Rainfall (+0.25mm)

As you can see from the chart, the wet season starts in May and continues until early November. The wettest months are September and October.

KEY: September has on average 15 days of rain and 305 mm of rainfall.

It doesn't rain all day. Sometimes for only a couple of hours at a time. On many days it doesn't rain until the evening. December to February are the best months to visit. March and April is relatively dry though they are also the hottest months.

Average Temperatures (Celsius)

Bangkok is hot all year round as you can see from the chart. The hottest month is April.

The record maximum temperature was 41 Celsius between the months of February and May. This is Thailand's hot season.

KEY: The months July to September only have an average of five hours of sunshine each and the average temperature is 32 Celsius. This is the height of the Wet Season.

The record lowest temperature was 11 Celsius in December. November to January is the Cool Season.