If you’re looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Taichung: The hottest months are usually July and August, with an average temperature of 28°C, while the coldest months are January and February, with an average of 18°C. The rainiest months in Taichung are June, August, May and April, with each month seeing an average of 303 mm of rainfall.