Triumph's came from England, the land of constant rain!!
The bikes designed for it
Stay as close to 90 degrees as you can on corners. Never brake on a corner... use the back brake more than usual. Extra braking distance. Avoid leaves, white lines, sewer covers. Walls :P
I just take it easy... make a point of going out on your bike in the rain to practice. A week of wet weather riding will give you lots of confidence.
Stay safe.
