Mount Kinabalu Weather
Weather does not usually stop a Mount Kinabalu climb. It decides what you see from the top, how slippery the granite is at three in the morning, and whether the afternoon you spend walking uphill is a wet one.
What the weather does to a visit here
The important thing about rain on this mountain is when it arrives. Convection builds through the day, so the heavy stuff lands in the afternoon — which is exactly when you are walking up to the huts. By the time you leave for the summit at half past two in the morning it has usually cleared, which is why climbers post photographs of a perfect sunrise after a day of being soaked.
What weather genuinely changes: the grip on the granite above the checkpoint, how cold the summit feels, and whether there is anything to look at when you get there. What it occasionally changes: whether Sabah Parks lets anyone above Sayat-Sayat at all.
Your booking is non-refundable, and bad weather is not a refund. One listing promises a new date or a full refund if the operator cancels for weather; the others are silent. Ask before you pay, and read what each fare covers on the visiting page.
Mount Kinabalu month by month
January
Wet. The northeast monsoon is still running and the afternoons are reliably heavy. Summit mornings can still be clear, because the rain here builds through the day rather than overnight. Trails are slick and the granite above the checkpoint stays greasy for longer. Fewer climbers than in the dry months.
February
The turn. Rainfall drops through the month and February is the start of the driest stretch of the year. Mornings are the clearest they get, and the cloud sea below the summit plateau is at its most reliable. Book early: this is when everybody wants to climb.
March
One of the two best months. Afternoon showers are shorter and less certain than either side of it, and the summit is clear more mornings than not. Expect single-figure temperatures on the granite before dawn. Permits for March go months ahead.
April
Still dry, and warming. The last of the reliably clear stretch before the rain builds again. Good visibility from the summit and a decent chance of seeing the Crocker Range and, on the clearest mornings, the sea. Busy.
May
Transitional. Afternoon rain returns and builds through the month, though mornings stay usable and summit conditions are often fine. Reviews from May climbers describe good trips with wet afternoons, which is a fair summary of the month.
June
Wet afternoons are the rule rather than the exception, and one climber describes rain every afternoon of their trip while still rating it five stars. The ascent gets soaked; the summit push usually does not. Cloud is more likely to sit on the top.
July
Similar to June, with heavy afternoon convection. Visibility from the summit is a lottery rather than a certainty. On the other hand the forest is at its most dramatic in the mist, and this is when the mossy section between the gate and the huts looks like nothing else.
August
Still wet in the afternoons, and one of the busier months because of northern-hemisphere holidays. Book well ahead despite the weather. Mornings can be excellent, and the rain arriving after you are back at the huts costs you nothing.
September
Rain continues, and the ground stays wet. The rope sections above the checkpoint take more care in these conditions. Quieter on the trail than August, which is a real benefit on a mountain where the huts fill first.
October
Wetter again as the year turns towards the northeast monsoon. Afternoon storms are common and can be heavy enough that Sabah Parks closes the summit trail for a morning. Your guide decides, and the decision is not negotiable.
November
One of the wettest months. Expect rain most days and cloud on the summit more often than not. It is the cheapest time to find a permit at short notice, which is the trade-off on offer.
December
Wet, and busy over the holidays. The combination is the worst of both for planning. If your dates are fixed to late December, book the permit as far ahead as you can and treat a clear summit as a bonus rather than the plan.
The seasons, and which one you want
There are two, and they overlap untidily. February to April is the dry stretch: the shortest afternoon showers, the clearest summit mornings and the highest chance the sea of cloud is below you rather than around you. It is also when permits are hardest to get, which follows.
October to January is the wet end of the year, driven by the northeast monsoon. Rain most days, cloud on the summit more often, and the occasional morning when the trail above the checkpoint is closed. In exchange, a permit at shorter notice and a quieter trail.
May to September sits between the two: wet afternoons, usable mornings, and busy in July and August for reasons that have nothing to do with the weather. If your dates can move, move them to March. If they cannot, go anyway — the Kinabalu National Park tour run all year.
Best time of day
You do not get a choice, and that is a mercy. Every climb here summits before dawn because that is when the mountain is clearest and the trail is coldest and firmest underfoot. By nine in the morning cloud is usually building on the plateau, and by noon the view you walked all night for has gone.
The descent is the part the weather does affect. Coming down through the afternoon build-up is normal, and it is why waterproofs matter as much on day two as on day one.
Frequently asked questions
Does it rain every day on Mount Kinabalu?
Not every day, but expect rain on most afternoons in most months. The mountain makes its own weather, and the pattern is far more reliable than the amount.
Will rain stop me summiting?
Usually not. Sabah Parks can close the summit trail in bad conditions and your guide can turn a group round above the checkpoint, but the common outcome of a wet trip is a wet ascent and a clear summit push.
Which is the driest month?
March, with February and April close behind. Those three give you the best chance of a clear sunrise and the hardest permits to book.
What happens to my booking if the mountain closes?
It depends on the listing. One listing states that an operator cancellation for bad weather gets you a new date or a full refund. The other three do not say, so ask before you pay.
How cold is it at the summit?
Cold enough for gloves, a hat and a windproof layer. You are at 4,095 m in the hour before sunrise, which is the coldest part of the day up there.
Picked a month?
Permits go by the date, and the dry months go first. See what is available for the dates you can travel.