Last year I rode from London, England to Singapore from July 1 to 15 September, then around Australia, including Top of Cape York, in October. Got a good 10 hours of riding each day I wanted to. In India, Bangladesh, Thailand, and Malysia it rained usually at 15.00, but only in short bursts, and not every day. In Australia only near Perth during the first week.
Since all the main roads are paved, riding is unproblematic. Watch out for giant droppings from holy cows and water buffaloes, and beware of homicidal truck drivers. Otherwise you should be OK. In Muslim countries pray to Almight Allah. This may help. But don't count on it.