Can I get heat stroke on Mt. Rinjani?

Heat stroke isn’t as common as altitude or cold issues on Rinjani, but it can definitely happen during the lower sections of the trek. The first few hours on the Sembalun route climb through open grassland with basically no shade, and the tropical heat hits hard if you’re not used to it. The humidity doesn’t help either. You’re sweating buckets but the moisture in the air means the sweat doesn’t evaporate properly, so your body can’t cool itself efficiently.

Guides at Lombok-Indonesia.org know this stretch well. They’ve seen it happen enough times to recognize the early signs. They pace the group carefully, build in rest stops in shaded spots, and make sure everyone’s drinking before they feel overheated. Once you gain elevation and hit cooler air, the risk drops fast. But those first few hours can be brutal if you underestimate them.

If you feel lightheaded, nauseous, or you stop sweating even though it’s hot, tell your guide right away. Don’t try to tough it out. They’ll get you into shade, cool you down, and slow the pace. A wide-brimmed hat, light breathable clothes, and sunscreen make a huge difference here. Rinjani throws multiple climates at you in one day, so prepping for the heat matters just as much as packing for the cold.

The guides carry oral rehydration salts and basic medications for heat-related symptoms, so there’s backup if you need it. Just speak up early and let them help.