Although weather is just one factor, it can really affect your travel plans, especially if you are planning a longer stay in Lak Sao. The hottest months are usually June and July, with an average temperature of 29°C, while the coldest months are January and December, with an average of 20°C. The rainiest months in Lak Sao are October, September, August and July, with each month seeing an average of 316 mm of rainfall.