Several BBC Twitter accounts, including its weather, Arabic and Radio Ulster feeds were hijacked by a group calling itself Syrian Electronic Army earlier.
A series of tweets about fake weather conditions in Middle Eastern countries began appearing on Thursday afternoon.
The accounts are the latest in a series of large corporate Twitter feeds to have been breached.
The BBC said that it now has control of all three accounts and all inappropriate content has been deleted.
A BBC spokeswoman said: "We apologise to our audiences that this unacceptable material appeared under the BBC's name."