To refill on supplies.
The First Fleet left Rio De Janeiro on 3 September 1787.
In Rio De Janeiro the First Fleet stocked up on live stock ect.
On 7 August 1787 the First Fleet arrived at Rio de Janeiro and left on 5 September.
Capirina
The First Fleet's trip from Portsmouth to Rio de Janeiro took almost three months. The fleet departed on 13 May 1787 and arrived in Rio on 7 August 1787.
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On 7 August 1787 the First Fleet arrived at Rio de Janeiro and left on 5 September.
The First Fleet did not land either in or on London. The First Fleet departed Portsmouth, England on 13 May 1787. It then travelled to Australia via the Canary Islands, Rio de Janeiro and South Africa, arriving in Port Jackson, New South Wales on 26 January 1788.
The First Fleet, which left England in May 1787 to establish a penal colony in Australia, stopped at Rio de Janeiro for supplies. The fleet arrived there on 5 August 1787, taking approximately three months from their departure to reach the Brazilian port. They spent about a month in Rio before continuing their journey to Australia.
There were actually 3 places that the First Fleet stopped at. The first one that they stopped at was Teneriffe, in Canary Islands, Rio De Janeiro and Capetown.
The journey of the First Fleet from England to New South Wales was about 8 months. The ships could not carry enough supplies for everyone for that amount of time, which is why the First Fleet made three stops between England and NSW. Rio de Janeiro was a thriving port, and well stocked with rations (and fresh livestock) for the journey.