The another rather strong high-pressure system from China extend to upper Thailand and the South China Sea. The Northeast monsoon prevailing over the Gulf, the South and the Andaman Sea is strengthening. Continuous rain and isolated heavy to very heavy rains are forecast in the South while less rains and isolated thundershowers are possible in the upper country. Cool in the morning with strong winds and a decrease in temperature by 3–5 °C in the Northeast while the North a decrease in temperature by 1–3 °C. In the Andaman Sea and the Gulf will strengthen, the waves will be higher than 2 meters high in thundershower areas.