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In many ways the weather in Thailand in July is just a continuation of what most of the country has seen in June. Both the north and south of Thailand see about the same temperature range and similar or slightly heavier levels of rainfall. The southeast islands, notably Ko Samui, Ko Pha Ngan and Ko Tao are good destinations in July, though do expect a bit of rain and wind. On the other hand, Ko Chang near Cambodia and the Andaman coast both see considerably heavier rain in July. See below for detailed climate charts and regional weather variations across the country.
Where are the best places in Thailand in July? Consider:
July is wet throughout most of Thailand, but splashes of sunshine make the jungles of Khao Yai, Umphang and Nan absolutely breathtaking. Waterfalls that were dry back in May now crash down, wildlife is active and flora thrives. The Khao Phansa holiday (usually held in July but sometimes late June) marks the beginning of the rains retreat for Buddhist monastics, coinciding with big events like Ubon Ratchathani’s Hae Thian (Candle) Festival and Phi Ta Khon in Dan Sai. If you’re looking for the lowest chances of rain, hit the lower Gulf provinces of Surat Thani, Nakhon Si Thammarat, Phatthalung and Songkhla.
The upper Gulf coast, including beach towns like Hua Hin and Ban Krut, stay relatively dry in July, while the lower Gulf islands of Ko Samui, Ko Pha Ngan and Ko Tao are a lot drier than other Thai islands. We suggest avoiding Andaman Sea islands, such as Phuket and Ko Lanta, and especially eastern Gulf islands, like Ko Chang, at this time of year.
July marks the beginning of a steady rise in rainfall and very slight drop in daily average temperatures that will continue on a monthly basis through to September. As long as you don't mind the rain, Kanchanaburi is quite good this time of the year as the waterfalls are really going and the national parks are pretty (if muddy and slippery).
If you thought June on Ko Chang was wet, prepare for more of the same in July. Torrential. The especially heavy rain starts to take its toll with erosion and landslides becoming a bit of a problem. Not to say there is no sun at all, but generally speaking, July is an especially wet month on Ko Chang.
July is the first really wet month of the year in Chiang Mai. You'll see some rain more often than not and street flooding will be a problem after heavy downfalls. While the forests will really be coming into their own as far as lushness is concerned, the trekking will be heavy going. You will get wet. You will get muddy. But that's to be expected — you're in a tropical jungle afterall! The provinces bordering Burma along with Chiang Rai in the far north will see even more rain than elsewhere in northern Thailand.
The weather in July in northeast Thailand is pretty much a carbon copy of June — wet and hot! The far eastern province of Nakhon Phanom sees especially heavy rain with the rest of Thailand. While you'll be seeing rain roughly every other day, this remains a reasonable time weather-wise to visit Northeast Thailand.
Expect very similar weather in July as you would in June. Hot and wet, though not as wet as the west coast. The northern stretch of the Gulf Coast, including towns like Prachuap Khiri Khan, Hua Hin and Phetburi will be significantly drier than Ko Samui, Ko Pha Ngan and Ko Tao. Even though there will be rain on the islands in July, there will still be a lot of sun too, and, for dedicated island time, these islands remain your best bet in Thailand weather-wise.
The west coast of Thailand is wet with rough seas in July. Some provinces fare worse than others: Ranong in the north is especially wet, Phuket less so, Trang lesser so and Satun lesser so still, but they're still all pretty wet! Some smaller islands may see a selection of the cheaper guesthouses and resorts shut down or run on a skeleton staff as business drops. Ferry frequency will also be reduced — especially out to Ko Lipe in Saturn province. Overall, for island time, the east (Gulf) coast is better this time of year.