Month by month
Katavi in September: the pools at their tightest, the heat at its worst
September is where the Katuma's retreat reaches its extreme. The river that has been shrinking since June is now reduced to a scattering of pools, and everything on the floodplain that needs water has nowhere else to get it. This is the month the hippo scrums become genuinely crowded, and it is also the hottest, hardest stretch of the day to be out watching them.
If you only want the answer
September brings Katavi's most crowded hippo pools of the year, with independent estimates putting 400 to 500 or more animals into the remaining water, alongside the season's first good chance of crocodile caves in the riverbanks. Schedule around the midday heat; this is the hottest month for daytime highs before October edges it out.
Where the shrinking river ends up
By September the Katuma has stopped flowing in any meaningful sense and exists as a handful of pools along its bed. Independent estimates put 400 to 500 or more hippos into what remains, jostling, roaring and fighting daily for water that barely covers them, and it is as raw a wildlife scene as anywhere on the continent.
The crocodiles add a detail few visitors expect: as the water disappears, Nile crocodiles here retreat into caves dug into the riverbank and lie dormant through the driest weeks, sometimes stacked together out of the light. September is the first of the two months your guide can reliably show you the caves along the Katuma and Kapapa.
The trade-off is the heat
Day temperatures average 33.4°C in September, the hottest of any month bar October, and the combination of heat and dust means midday sightings flatten out even as the water-driven drama around the pools intensifies. Buffalo herds are now at their largest of the season, columns of over a thousand animals moving between the shrinking water and whatever shade the miombo still offers.
Camps and flights both run at full capacity this month, a continuation of August's demand rather than a new peak, so the booking pressure that built through July and August carries straight through.
One thing to do differently
Push your second drive of the day later, toward four in the afternoon rather than the usual mid-afternoon start, so you are on the water when the light softens rather than fighting the worst of the heat for an extra hour of daylight that delivers little. Carry more water than you think you need; September's heat catches out visitors who packed for a standard safari day rather than this one.