Thailand has three seasons, dry, hot and rainy. All are pretty similar to each other in terms of how hot it gets which is between 31-33 degrees but the main the variations between the seasons are the hours of sunlight and how much it rains.
Prices for everything vary during the three seasons, this includes flights, hotels and restaurant prices. Its always cheaper to go during the rainy season from September – November, the flight price are between £550 – £600 and prices for accommodation and eating out are cheaper than in the high season. During late December flight prices rocket up to over £1000, any other time they are usually between £550-£700. Obviously in the summer months like July/August prices spike again and you would expect to pay around £800 for direct flights.
Koh Samui is in the Gulf of Thailand, it is in pretty close proximity of many other popular islands such as Koh Tao, Koh Phangan, Phi Phi, Koh Lanta and Railay, so I tend to use Samui’s weather averages as a guide for deciding on when to go.
The Dry Season December – February
Not much rain falls during the dry season. Some light breeze and welcomed winds but it’s generally always sunny and very hot.
The Hot Season March – August
The weather during this season is still dry, hot and very sunny, however it may rain sometimes but it does it’s usually in very short spells. Temperatures range between 28-35 Degrees Celsius.
The Rainy Season September – November
This is also known as the monsoon season. It’s still very hot and sunny but you can sometimes find that you will get sudden monsoon type showers for brief spells. Whenever I have been during the raining season, I found that it mainly rained during the early hours in the morning and most of the days were just as nice as they are in the hot and dry seasons. I have no reservations about going to Thailand in the rainy season.