Planning for the weather is a good way to make your trip to Hsinchu relaxing and enjoyable, especially when you’re splurging. The hottest months are usually July and August with an average temp of 83°F, while the coldest months are January and February with an average of 64°F. The rainiest months in Hsinchu are August, June, May, and September, with each month seeing an average of 8 inches of rainfall.