Travel light
It is between 29 and 32 degrees all year round in Bali, and between 24 and 26 degrees in the evening by the sea. Light clothing is therefore sufficient. However, remember to take a light jacket if you go up in the heights, it can be cooler (21 to 22 degrees in the mountains). If you come during periods of rain, bring a raincoat, or you can buy a poncho on site. Also remember to take a bag pack, practical during visits (shoulder strap style, banana etc.).
Remember that to be able to visit the temples you have to cover your shoulders and legs. You can also buy sarong on site. There is also no need to bring towels; all hotels will provide them to make your Bali vacation more enjoyable.
You can possibly bring a flashlight, especially if you plan to climb Mount Batur which is one of the activities not to be missed during a stay in Bali. Here, the streets are rarely lit and night falls around 6 p.m.
All hotels have an inexpensive laundry service. Think practical, leave some space in your luggage for souvenirs when you return to remember your Bali vacation for a long time.
Mosquito repellents
These will be of great help to you, just like soothing creams if you get bitten. You can also buy them on site.