One should probably expect a "lot if rain" if you visit during the rainy season. The closer you get to December, the less likely you might expect a continuous downpour. But you should still expect rain more often than not. Absent heavy monsoon rains, or thunder storms, and given warm temperatures, a light continuous rain shouldn't necessarily preclude sightseeing.
It's always a good idea to find a reliable weather forecasting site that provides more info than a single pictogram for the whole day. One that gives hourly forecasts is generally more helpful. And that was what the PP provided. No one jumped down anyone's throat.