Your question seems vague to me. Where abouts in Borneo? Borneo is a huge place. I take it you are there for the beach. Which one in Borneo? The beach in Penang is way different from what you will be getting in Borneo but it also depends on which one in Borneo. Again Borneo is huge.
As for the weather, hey, it is the tropics. You might get a huge downpour in Kota Kinabalu while it will sunny bright in Kuching and Sibu for example.
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