The Australian Broadcasting Corporation reported that all the leaders delivered stern warnings about the lethal threat that climate change posed to their nations.
Guterres is intent on building global momentum for sharper cuts to emissions, arguing that drastic action is necessary to stave off ecological disaster.
Guterres and Pacific leaders were careful not to point fingers, simply saying that large and developed countries had a responsibility to act.
The ABC commented that of all the countries ringed around Guterres at the Fiji meeting, only two - Australia and New Zealand - make a meaningful contribution to climate change.
And while Pacific leaders have praised New Zealand's announcement that it wants to go carbon neutral by 2050, many are frustrated that Australia has failed to curb its emissions.
Antonio Guterres had already firmly batted away a question about Australia's debate on climate change, saying that foreigners should never meddle in domestic election debates.