Thailand in July
July is exactly the month where it matters most to understand that 'Thailand' isn't one season: the Andaman side (Phuket, Krabi) is in full rainy season, while the Gulf islands are still relatively reasonable.
Weather by Region
Phuket/Krabi/Phi Phi: frequent rain, rougher seas. Koh Samui/Koh Phangan/Koh Tao: still a reasonable season, one reason Samui is popular for summer break. Bangkok: very hot and humid with frequent rain. North: hot and humid, not ideal for long treks but temples remain accessible.
Crowds and Prices
Low season weather-wise, but demand rises due to European summer holidays — book ahead even though it's officially 'low season'.
Recommended Destinations for July
Who Should Visit
Anyone whose dates are locked to summer break — Koh Samui/Koh Phangan/Koh Tao are the safer bet than Phuket/Krabi during this period.