Malaysia is one of the iconic tourist attractions that can be visited anytime for an amazing experience. However, on the experiences you are seeking and regions you’d like to visit. However, here are a few pointers which might prove helpful:
Southwest Monsoon (May to September): Visiting the peninsular regions like Kuala Lumpur and Penang during these months is better as rainfall is comparatively low. You can easily partake in outdoor activities during this time.
Northeast Monsoon (November to March) Areas on the west coast like Langkawi and Pangkor are best visited during these times as rains are low.