Lion Mountain weather and the best time to climb

Why the south-east gets the weather

Mauritius lies in the belt of the south-east trade winds, steady surface winds that blow out of the subtropical high towards the equator. They reach the island on the south and east coasts, and when they meet the mountains and the central plateau they are forced upward, cool and drop their moisture. Climatologists call this orographic rain, and a peer-reviewed study of the island’s rainfall describes exactly that pattern, with the windward south and east receiving the rain, the central plateau the wettest of all and the north and west coasts sitting in a drier rain shadow. The UK Met Office puts it more bluntly, noting that the east coast and the plateau catch most of the wet weather while the west coast is much drier.

Lion Mountain stands directly in the path of those winds on this stretch of coast, which is why cloud can sit on its ridge while the coast below is in sunshine. The Mauritius Meteorological Services add two details worth knowing. The trade winds strengthen when a cold front passes to the south of the island, which happens most in winter, and thunderstorms are a summer affair, mostly from December to April. The winds themselves blow hardest in July and August, which is when the ridge is windiest and Pointe d’Esny and Blue Bay are described as noticeably windy too.

Rainfall and temperature month by month

The nearest long-term weather station is at Plaisance, the airport, 6 to 9 km from the mountain. Its 1991 to 2020 record gives a good picture of the coast at the foot of Lion Mountain, with about 1,659 mm of rain a year spread over 12 to 19 rain days a month. Daytime highs reach 30 °C from December to March and fall to 25 °C in July and August, while nights drop from 24 °C in January and February to 19 °C between June and September.

Two things stand out. First, the coast is drier than people expect. The official East region figure for the same period is 2,640 mm a year, but that average includes upland stations, and the island mean is 2,018 mm, so Mahébourg’s coast gets less rain than the island as a whole and far less than the plateau, though nearly twice as much as the west coast at about 920 mm. Second, the seasons are strongly marked. Roughly two thirds of the island’s rain falls in the summer half of the year, from November to April, and October is the driest month almost everywhere.

The May to November window

Local guides put the hiking season for Lion Mountain at May to November and advise dry weather only, and the monthly numbers explain why. From May the rain falls away sharply, the daytime highs ease to the mid twenties, the nights are fresh and the cyclone window closes in mid May. June to September is cool, dry and windy, with the trade winds at their strongest in July and August and the latest sunrises of the year, so a 07:00 start is comfortable rather than urgent. September and October are the driest months and remain pleasant before the heat returns.

November is a hinge month. It is still dry on the coast, with the earliest sunrises of the year, but it is also the official start of the cyclone season and the first thunderstorms can arrive late in the month. December to March is hot, humid and wet, with daytime highs of 30 °C on the coast, afternoon storms and the real possibility of a cyclone warning. The mountain can still be climbed on a clear morning in summer, and one route app records its busiest period as running from July right round to May, but you plan around the forecast rather than the calendar, start at first light and accept that the clay will be slippery.

Cyclone season and the warning classes

The Mauritius cyclone season officially runs from 15 November to 15 May, slightly longer than the south-west Indian Ocean season as a whole, which closes at the end of April. Most activity falls between January and March. The Mauritius Meteorological Services issue warnings in four classes, and the simple rule for hikers is that no class is compatible with being on a mountain. A Class I warning is already a reason to cancel, and a Class III or IV means staying indoors.

After a cyclone or a tropical storm has passed, give the mountain a few days. The cane roads turn to mud, fallen branches and whole trees can block the forest path, the clay stays saturated and the rock on the head is at its most treacherous. The forest here is secondary and heavily invaded by introduced species, and fallen branches across the path are to be expected after any strong blow.

Fog, wet rock and slippery clay on the ridge

Lion Mountain is low, but it is high enough and far enough into the trade wind to catch cloud. Hikers report fog and rain on the summit while the coast is clear, most recently in the winter of 2026, and a ridge in cloud is both disorienting on an unmarked route and wet underfoot. The soil is a thin, clay-rich layer over weathered basalt that drains slowly and stays slippery for a long time after a shower, which is the single most repeated warning in recorded reviews. In the dry months fallen leaves on the steep forest climb do a similar job, and mud is mentioned in reviews from every season.

The practical consequences are simple. Check the forecast for the south-east specifically, because a forecast for the island or for the west coast tells you little about this ridge. If it rained hard yesterday, expect the forest climb to be greasy and the slabs on the head to be worse than greasy, and plan to stop at the ridge junction. If you arrive to find the summit in cloud, the Eastern Viewpoint on the eastern ridge is lower and often clearer, and the view from there is rated higher than the summit anyway. The wind on the open ridge is a help in heat and a nuisance in winter, when a light shell is worth carrying.

What the summit is doing now

The panel below shows current conditions on the ridge, drawn from live weather data for the summit position. Use it the evening before and again in the morning, alongside the Mauritius Meteorological Services forecast for the south-east and any cyclone bulletin in season. A dry, clear reading at dawn with light wind is the day to go for the head. Cloud on the summit, recent rain or a strengthening south-easterly are reasons to aim for the ridge junction or the Eastern Viewpoint instead, or to spend the morning in Mahébourg and climb tomorrow.