The best months to visit Taiwan are January and February. See monthly temperatures, rainfall and rain days (1991–2020 averages) to plan your trip.
Average daytime high and monthly rainfall in Taiwan: January 18°C / 85mm; February 19°C / 94mm; March 21°C / 106mm; April 25°C / 134mm; May 28°C / 206mm; June 30°C / 253mm; July 31°C / 222mm; August 31°C / 294mm; September 29°C / 247mm; October 26°C / 207mm; November 23°C / 129mm; December 20°C / 100mm.