The beach break where you have also waves that can be pretty big. Stay on the right of the river mouth. There are totally no rocks or coral around so at least for this point is quite safe.
The dry season is from April till October and wind months as well. Temperature is tropical, no wetsuit needed. Water is 25-32°C. Air from 20-35°C. It is possible to surf all year around.
The wind is sideoffshore but almost sideshore. It's pretty gusty specially near the beach break. It can happen, that if there is no wind on the east cost there is 14-18 knots of wind on this side. Some kind of venturi effect plus the land heating create more wind in this side. If the easterlies are strong the wind here is too offshore, go to Sanur or Nusa Dua instead.