Visiting local bars in Chiayi City is more fun in good weather. 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 temp of 81°F, while the coldest months are January and February with an average of 65°F. The rainiest months in Chiayi City are August, June, May, and July, with each month seeing an average of 16 inches of rainfall.