The water temperatures in Bali are mostly between 26 and 29 °C all year. During July to November cool unserwater currents might surprise you with temperatures between 21 to 25 °C (depending on dive site, tide and currents).

If you want to dive a lot you should use a long 3mm or better 5mm dive suit.

The visibility underwater in Bali depends on the season, tide and dive site. They are mostly between 10 and 30 m, in average 10 to 20 m. So we can say: look forward to mostly good underwater visibility in Bali!