Well, there will be wind, because it's the monsoon. But you might be lucky; not every monsoon day has rain, and when it does rain, it doesn't necessarily rain for long. But if it rains, there will be floods. Hub deep or deeper. You're probably better off on a hire bike just for the sake of your bearings!
I never rode much in the monsoon, especially not out of town, so can't say anymore really, except that equally I don't remember the monsoon ever being so bad that I couldn't eg get to office. However, I was living well inland, I guess the monsoon is going to be stronger on the coast.