On Sunday, 3 August 2025, Her Excellency the Honourable Ms Sam Mostyn AC travelled from Sydney, New South Wales to Singapore.

In the afternoon, the Governor-General attended a country brief with His Excellency Mr Allaster Cox, High Commissioner to Singapore.

In the evening, the Governor-General, as guest of Mr Greg Shaw, Executive General Manager, Swimming Australia, attended the World Aquatics Championship Finals at Singapore Sports Hub.