The cool, dry months of spring from June to October and the hot and dry summer months of December to February are the best times to visit.
Towards the end of the main dry season, from September to November it is probably easiest to spot animals as they come for a drink at some of the few remaining waterholes. But even throughout the rest of the year game viewing is relatively easy here, especially on the open grasslands.
From December to April the black cotton soil of the Mkata floodplains (the grasslands) can become waterlogged depending on the amount of rain the park receives. But as it usually dries up quickly this shouldn’t cause too many issues.