Based on the release of the BMKG of the Republic of Indonesia on May 16, 2025, the latest climatology analysis shows that as many as 403 season zones (ZOM) or around 57.7% of Indonesia's territory are predicted to enter the dry season between April and June 2025. The West Nusa Tenggara region is one of the regions that will experience the earliest dry season compared to other regions.
This week is predicted to be the peak of the transition period from the rainy season to the dry season in the Lombok region. The phenomenon that marks this is the scorching hot weather during the day but accompanied by heavy rain in the afternoon or evening. During this transition period, atmospheric conditions are very unstable so that there is the potential for the formation of convective clouds such as cumulonimbus (CB) which can cause extreme weather such as heavy rain, lightning and strong winds in most areas of Lombok.
How is the weather condition of Mount Rinjani this week? Still the same as the general weather conditions on the island of Lombok. In the morning it is generally sunny so that climbers will be able to see the sunrise from sunrise points such as the peak and crater rim. Thick clouds will generally come starting at 9 or 10 am. The potential for rain to fall along the hiking trail is very high, especially the trail below 1800 meters above sea level, rain will generally fall between 12:00-16:00.
In general, climbing Mount Rinjani is still in the safe category, but climbers still need to be vigilant on hiking trails that can potentially become water routes such as post 3 Sembalun, the Senaru climbing gate to post 2 Senaru and also several water route points on the torean route. Preparing yourself with a light raincoat and shoes that are suitable for wet terrain is highly recommended. Use a waterproof lining to prevent clothes carried in your bag from getting wet.
For 3-day weather data, you can see it at https://rinjanitrekkingcenter.com/weather-forecast
