Planning for the weather is an important factor for making your trip to Miaoli a success, especially when you’re splurging. The hottest months are usually August and September, with an average temperature of 26°C, while the coldest months are January and February, with an average of 18°C. The rainiest months in Miaoli are August, June, May and July, with each month seeing an average of 354 mm of rainfall.