Would you do it?

There's a 400k I wanted to do this weekend, but the forecast is getting worse and worse. From what I can tell, it will be raining probably during the day, and definitely at night. I have no experience riding in the rain at night. How does it effect your visibility? I have great lights, but will they be useless in a heavy rain?

My heart isn't set on this ride. However, my "A" race was two weeks ago and I got sick halfway through. So, was hoping to redeem myself by doing this 400K. But, I wonder if it's wise. Temps will be 55-67, but looks like rain the whole way.

Stay home, or break out my rain bike and go for it?