More than 1,000 people crossed the English Channel in small boats the day after the total for the year exceeded 30,000, according to Government figures.
The Ministry of Defence has confirmed that 21 boats were intercepted on Thursday carrying 1,150 people.
The number of arrivals this week has led officials to erect special tents at Dover, Kent, to keep migrants covered as they appear to be overflowing from existing facilities while being processed.
It is more than five months since then-home secretary Priti Patel announced plans to send migrants to Rwanda to try to deter people from crossing the Channel.
Since then, 26,397 people have arrived in the UK after making the journey.
However, the first deportation flight, due to take off on June 14, was grounded amid legal challenges.
Several asylum seekers, the Public and Commercial Services Union and charities Care4Calais, Detention Action and Asylum Aid, are embroiled in court cases with the Home Office as they challenge the legality of the policy.