Malaysia Weather Guide

The honest opening.

This page publishes no temperature, no rainfall total, no humidity figure and no sea temperature for Malaysia, in any month or any state. None of the sources this cluster cites carries them. That is a statement about this register rather than about Malaysian weather, which is documented in detail by the Malaysian Meteorological Department.

We could reproduce a figure from memory. It would look identical on the page to one that had been checked, and there would be no way for you to tell which you were reading. So the page does not, and points you at the department instead.

Why one national answer is the wrong shape.

Malaysia is in two pieces on either side of the South China Sea, and the wind patterns that bring its rain do not arrive everywhere at once. The peninsula's west coast, its east coast and the Borneo states of Sabah and Sarawak each have their own pattern. A season that closes boat services on one coast can be the settled time on the other.

The practical consequence is about planning rather than packing. If the itinerary crosses between the halves, or between the peninsula's coasts, you are crossing between weather patterns as well, and a single answer to when to go cannot be right for both ends of it.

The haze, which is the one seasonal fact this cluster can evidence.

The health advice this cluster cites records that forest fires in Indonesia can cause haze between June and October, that high levels of air pollution in major towns and cities may make respiratory conditions worse, and that haze can cause disruption to local travel, regional air travel and to schools.

Take that seriously and read it precisely. It is a window in which haze is possible, not a season in which it is certain: it depends on fires in another country and on which way the wind blows. Some years in that window are clear. What it means in practice is that between June and October there is a risk to long views, to flights between the peninsula and Borneo, and to anyone with a respiratory condition, and that the risk is absent the rest of the year. The same advice names the Air Pollutant Index Management System run by the Malaysian Department of Environment as the place to check the current picture, along with health advisories from the department.

Altitude, which is weather of a different kind.

The same advice records that altitude sickness is a risk in parts of Malaysia, including Mount Kinabalu in eastern Malaysia. That is worth separating from the rest of this page, because it is not a matter of what month you go. Altitude affects people differently, it does not track fitness, and the response to it is acclimatization and turning back rather than better kit. If a climb is in the plan, raise it with a clinician in advance and read the operator's own acclimatization schedule rather than assuming one.

What the weather changes about a day.

Two things the sources do support, without a number attached. Heat and humidity make the middle of the day the worst time to be walking a historic quarter, which is most of what a visitor does in Melaka and George Town, so early and late are better hours. And rain here arrives hard and stops, rather than settling in for a day, so a shower is usually a reason to sit somewhere for half an hour rather than to abandon a plan.

Neither of those is a forecast. They are the shape of a tropical day, and the packing list in this cluster covers what they mean for what you carry.

Where to get the numbers.

The Malaysian Meteorological Department is the national authority and publishes forecasts and climate summaries by region. Check the specific state rather than the country, and if the trip crosses between the peninsula and Borneo, check both. For haze specifically, the Air Pollutant Index Management System is the live picture rather than a seasonal average.

Sources

• UK Foreign, Commonwealth and Development Office: advises seeing a health professional at least 8 weeks before travel, names malaria, dengue and rabies in the states of Perlis, Kedah, Penang and Sarawak among the health risks, records altitude sickness as a risk including on Mount Kinabalu, and notes that forest fires in Indonesia can cause haze between June and October. Accessed 22 September 2026.
• UK Foreign, Commonwealth and Development Office: advises against all but essential travel to parts of Malaysia, and states that no travel can be guaranteed safe and that travelers should get appropriate travel insurance. Accessed 22 September 2026.