It comes after Friday saw almost 400 migrants make the perilous crossing across the Channel over the course of the first day of warm weather
Some 220 small boat migrants crossed the Channel on Sunday amid the record-breaking May heat, GB News can exclusively reveal.
Yesterday's arrivals brought the total figure since Friday up to 903, with fears that more vessels could attempt the crossing this week as hot weather is expected to continue.
The second set of arrivals comprised 83 people on board the Border Force vessel Ranger, including 15 women and 7 children, according to GB News' provisional figures.
Another Border Force vessel, Defender, docked in the early afternoon, bringing Sunday's total to 220.
May 24 marked the third of at least four days of sunny weather - with UK authorities preparing for an influx of migrants exploiting the warm spell.
Temperatures soared above 30C in some areas across Britain over the Bank Holiday weekend.
On Saturday, Frittenden, Kent, saw temperatures reach 30.5C on the warmest day of the year so far.
The UK Health Security Agency has issued amber heat health alerts for the Midlands, east and south-east England.
Monday could see temperatures climb to a sweltering 33C across the south east of England, signalling ideal weather conditions for those looking to smuggle migrants across the Channel.
The sunny climes are expected to persist in Dover through Tuesday, with highs of 29C, according to the Met Office forecast.
Temperatures in the coastal town are expected to cool down over the course of the week, only to rise again to 26C by Friday.
Official data from the Government have indicated a skyrocketing number of small-boat arrivals.
Since then, when tracking began, the total number of small-boat crossings reached a historic high of 200,000 migrants.
People smugglers have also begun deploying new tactics to evade the wrath of border officials.
At the start of May, the People's Channel revealed hundreds of small boat migrants set sail for Britain over a massive stretch of French and Belgian coastline to avoid police beach patrols.
A senior maritime source told the People's Channel: "People smugglers pushed off boats from well into Belgium, all the way down to a beach at Treport, south of the Somme.
"That's almost 100 miles of coastline the criminal gangs are using for launches on the same day.
"It's an obvious effort to avoid the beach patrols, which are normally concentrated around the Dunkirk and Calais areas."