Best time to go to Nai Harn
The best time to visit Thailand is from December to March. Average temperatures at this time of year range from 31 to 34 degrees, although sea breezes keep things a couple of degrees cooler in Phuket and Khao Lak. The temperatures aren’t too dissimilar in November and April, although you can expect a day or two of rain and increased humidity. Thailand's monsoon season usually runs from the end of April to October. During this time, you can expect frequent strong winds, rough seas and above-average rain showers.