Malaysia Weather by Month: Kuala Lumpur's Temperature Barely Moves 1.7°C — Rain Decides When to Go

The gap between Kuala Lumpur's warmest month (March) and its coolest (December) is 1.7°C: 31.7°C against 30.0°C. Nights stay between 23 and 25°C all year. Seoul's equivalent swing, January to August, is 27.4°C. By temperature, Malaysia barely has seasons.

So you choose when to go by rain — and there's more than one rainy season. The peninsula's west coast (Penang, Langkawi), its east coast (the Perhentian, Redang and Tioman islands) and Borneo (Kota Kinabalu) answer to different monsoons, so their wet seasons don't line up. When the west-coast islands are clearest, from December to March, many east-coast island resorts are closed.

Langkawi's February brings 52 mm of rain, its October 354 mm — nearly seven times as much. In the January–March dry season the sea is calm and the skies clear: the best time for island-hopping and the cable car, though it heats up towards the end, with about 17 days above 33°C in March. Penang follows the same rhythm with more rain, topping 400 mm a month in October–November.

Kota Kinabalu, with plenty of direct flights from Korea, runs on a different calendar from the peninsula: driest in February–April (118 mm in February) and wettest from October to January (351 mm in October). Firefly tours, island-hopping and sunset cruises all depend on the weather, so the same week can feel very different in the two seasons.

KL's rain peaks between monsoons, in April and October–November: 300 mm in April, 370 mm in November, and the least in June–July (172 mm in July). It mostly falls as late-afternoon and evening thunderstorms, so outdoor plans in the morning and malls or museums in the afternoon will carry you through even the wet months.

What to wear: summer outside, winter indoors

• Basics: breathable T-shirts and shorts, sandals, a folding umbrella or poncho.
• One thin long-sleeve: malls, cinemas and long-distance coaches are heavily air-conditioned.
• Temples and mosques: cover shoulders and knees; some, like the National Mosque, lend robes at the door.
• During Ramadan: it's courteous not to eat or drink in public in daylight. Ramadan follows the Islamic calendar, moving about 11 days earlier each year; in 2027 it begins in early February.

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In Malaysia a "good month" isn't a cooler one but a drier one — and it depends on where you are.

• Period and source: daily values from Open-Meteo's historical weather data (ERA5 reanalysis), 2016–2025, averaged by month at each city-centre coordinate.
• Versus official normals: reanalysis temperatures usually land within 1–2°C of station normals, but downpours get smoothed out, so monthly rain totals come out lower and rainy-day counts slightly higher.
• Rainy day: at least 1 mm of precipitation. Reanalysis picks up even light showers, so counts run high — especially in the tropics, where monthly millimetres are the better guide. Most tropical rain is an hour or two of downpour, not a washed-out day.
• Best months: a first pass from temperature, rainy days and humidity, then adjusted for seasonal factors such as the haze season and east-coast monsoon closures. It is a judgement call.