Marches have been organised by the Stop Trump Coalition, Women's March London, Campaign Against Climate Change the People's Assembly and War on Want among others, and a giant "Trump Baby" blimp will fly over Parliament Square.
Trump was expected to visit the capital as he makes his first visit to Britain since becoming US President.
The US ambassador in London told reporters Friday that Trump was "aware" of the planned protests but "is not avoiding anything".
The first couple departed Tuesday for a trip to Europe, where the president is expected to visit the United Kingdom, attend the North Atlantic Treaty Organisation summit in Brussels, and meet with Russian President Vladimir Putin in Helsinki.
In the morning he will visit a defence site with May to watch a demonstration of the UK's military capabilities and "integrated U.S. military training" before the pair travel to Chequers - the prime minister's country residence in Buckinghamshire - for bilateral talks.
"I don't get to see him almost as much as I used to get to see him and I'm excited to spend a couple of days with him - we're going to have a great time".
Conducted this week, the poll said while 74 per cent perceived the man as sexist, 63 per cent found him a racist, the report added. "As two nations we are safer, more prosperous and more creative when we work together and I am looking forward to this week's important discussions".
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"It's typical, but honestly Donald Trump's legacy will outlive any big orange balloon and the matters that will be discussed at Chequers and now in Brussels are much more important and will have a much longer effect than any day rally", she said.
However, after Trump announced his run for President, his tweets about Britain increased in frequency and criticism, with the 45th President of the United States criticising everything and everyone from the NHS, Theresa May, Sadiq Khan, UK policing, UK crime, Brexit and Nigel Farage.
The 36-year-old, who described Mr Trump's rhetoric as not "entirely to my taste", said she believes he is a proud American nationalist who has generally stuck to the pledges he made to voters.
Eric Trump is playing golf at the Trump International Golf Links at Menie, Aberdeenshire, and also plans to visit Trump Turnberry, near Girvan, South Ayrshire.
Sarah Elliott, chairwoman of Republicans Overseas UK, told CNN she did not think Trump would be fazed by the stunt.
Theresa May with Donald Trump at the White House in January 2017.
President Trump will head to London on Friday, where he's expected to face protests at every turn.
"The UK certainly has a lot of things going on", he said, referring to the resignations of Britain's Brexit and foreign ministers over the government's plan for ties with the European Union after it leaves the bloc in March.