My Trip

Koh Samui

  • Koh Samui Weather in September

    What is the weather like in Koh Samui in September


    The weather in Samui in September is starting to get cooler as we enter the autumn and winter months. Average temperatures are still quite pleasant at 28°C/82°F and the average humidity is between 63% and 89%. Rainfall is a feature of about 11 days of the month, though generally only in light showers adding up to about 130mm of precipitation. Most days are generally fine, with the added bonus that, after the August school holiday crowds, you can generally enjoy quiet beaches and attractions. Diving conditions are very good, with the clear water full of exciting marine life, average water temperatures of 28°C/82°F, mostly calm surface conditions on the east coast and noticeably smaller crowds at the more popular dive sites. With the wind coming from the west, the sea on that side of the island gets a little more ruffled, making it more popular with sailing enthusiasts. However, this is the last month of the sailing season before boat owners batten down the hatches for the coming monsoon season.

  • Main
    Oct »



    • January
    • April
    • July
    • October
    • May
    • August
    • March
    • June



    Average Rainfalls in Samui Highlights:
    (Obviously it varies each year!)

    Oct »



    You May Also Like

  • Follow us on FACEBOOK for daily photos!

Hotel Quick Finder | Select the date of your stay

Download our free travel guide

Get access to our free travel guides of the best things to do, see and visit, the best restaurants, shops and places to go at night too! All the important basics such weather and travel tips for your first trip are in there.

Print it out to carry around, save it on your phone or use it when you arrive. Just enter your details to get your free PDF Travel Guide and also add you to our free Asia Web Direct Travel Club Newsletter.

Talk to us!

Help us keep this site up-to-date by sending us your comments:

  • - Tell us if something is not right, outdated or closed
  • - Suggest your restaurant, bar or shop
  • - Tell what you would like to see in this website