Visiting local bars in Tiantai is better when the weather is good. These rainfall averages and temperatures can help you choose the best time for bar-hopping. The hottest months are usually July and August, with an average temperature of 26°C, while the coldest months are January and December, with an average of 8°C. The rainiest months in Tiantai are June, July, August and May, with each month seeing an average of 278 mm of rainfall.