July will see a further increase in rain and temperatures will start to drop a little (avg temp: 27-31°C), a welcome relief from the mercury busting highs of previous months. As the month progresses, rainfall will increase with short daily showers likely to become more prolonged as you move towards August, and some of the heaviest rains of the year.
Across the country rainfall increases throughout the month, although the beaches and islands on the eastern side of the peninsular tend to stay dry.
Conditions on either side of the Thai peninsular will vary. Visit the west and you should expect rain, at times heavy (avg temp: 27 °C), whilst on the east coast on Koh Samui and its neighbours, a little rain is expected from time to time, but days are mostly dry and sunny (avg temp: 29 °C). The rainy season starts in Koh Chang in July.