Julia Strachey spent the first six years of her life in India before travelling to London. After her parents' divorce, she moved in with her aunt Elinor Rendel in Melbury Road, off Kensington High Street. Four years later, Julia was sent to Brackenhurst boarding school; and it was during this time that Oliver Strachey began a new romance with Rendel's close friend Ray Costelloe, the niece of Alys Pearsall Smith, then the wife of the British philosopher Bertrand Russell. Julia in turn developed an intimate friendship with Alys, whom she affectionately referred to as 'Aunty Loo'. Smith's unusual and often wicked sense of humour was to have a lasting effect on Julia's literary style.

In 1932 the eccentric and witty Cheerful Weather for the Wedding was published by the Hogarth Press. Virginia Woolf wrote: 'I think it astonishingly good - complete and sharp and individual.' Both through the connections of her uncle Lytton, and the name she made for herself through her writing, Julia soon became integrated into the Bloomsbury Group, frequenting many of its social events. These unique experiences had a strong influence on her fiction. Until 1964, Julia was also an avid member of Bloomsbury's Memoir Club, where she and its other members discussed and wrote about their shared memories.

In 1927 Julia married the sculptor Stephen Tomlin. They separated in 1934. During this period, Julia made a living by writing short stories for magazines. It was also the beginning of her novel-writing career. In 1939, she met the art critic Lawrence Gowing, who was, at the time, only 21 years old. The couple went on to spend thirty years together, fifteen of them married, in Newcastle and in Chelsea, before Gowing fell in love with another woman.

There is very little information relating to Julia's Strachey death, except for the fact that it took place in 1979.