Hello, I plan to visit Taipei for my pre-wedding photoshoot in Spring for sakura season.

In March, the average temperature will be 20-35C and there are high chances of short showers so you need to take rain gears.
In April, the weather condition will be similar as March's. Generally speaking, these two months have good weather condition and it will not affect your shooting. You need to avoid going to there between July, August and September.