When to go
The only time to avoid is the wet season from November to March. Rain can be intense at this time, with potential for flooding and landslides. Otherwise, Bromo is accessible year-round, with the altitude the main determinant of conditions. Days start and finish cold – not much above freezing at their coldest. Temperatures then generally climb above 20˚C, with fierce sun at times in the thin air. Those pushing on to climb Semeru should bear in mind its considerably greater altitude: you’ll want a down jacket, gloves and your warmest sleeping bag. Jakarta or Denpasar on Bali, to the closer regional airport at Malang. In either case, the more comfy option is to charter transport up to the caldera’s main access points at Cemoro Lawang, or Tosari; or else you can jump in a minibus with the locals.
Pura Luhur Poten Bromo is an austere Hindu temple of volcanic stone at the foot of Mt Batok. It is dedicated to Sang Hyang Widhi Wasa, once called Acintya, ‘he who cannot be imagined’, supreme god of Indonesian Hinduism.