Thailand weather & when to go: September

September overview

Country-wide, September tends to be the wettest month of the year in Thailand with all corners of the country receiving rain in varying amounts. Temperatures continue to decline gradually throughout the month (avg temp: 25- 9°C) and thunder storms are not unusual as the humidity reaches its peak.

Excellent
Very Good
Good/Mixed
Poor
Not Advised

Annual overview

  Best   Good
  Mixed   Poor
Jan Feb Mar Apr May Jun
Jul Aug Sep Oct Nov Dec

September's weather in detail

Beach conditions are generally poor with heavy rain and rough seas experienced on the west coast (Phuket, Krabi, Khao Lak) and increasingly heavy rains in Koh Samui and Koh Pha Ngan on the south east coast. If you feel lucky then the resorts of Hua Hin & Cha Am are likely to offer the best beach conditions across the country. 

September is one of the wettest months in Khao Sok National Park, so take suitable waterproof clothing if you plan to visit this month. Don’t be put off by the rain: average temperatures during the month are a comfortable 25-26°C, the rainforest is green & lush, and there is more chance of spotting wildlife. 

It's not all bad news: visitor numbers are (unsurprisingly) far lower than in previous months and low season hotel deals can be had.

Our recommended journeys

Thailand’s far north is unquestionably the country’s most unspoilt region and our Insider's Thailand holiday will take you away from the well-worn trail and deep into this scenically stunning and culturally diverse area.

See all our itineraries in Thailand

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