An
official in the office of French Foreign Minister Laurent Fabius told the AFP
news agency the draft would be presented to ministers at 10:30 GMT.
No details of the
proposed agreement have been released so far.
The tentative deal
was reached nearly 16 hours after the talks had been scheduled to close.
"We have a
text to present," officials said, adding that the draft would be now
translated into the UN's six official languages.
Analysts say that
this is not a done deal - it will only be finally adopted if there are no
objections raised at Saturday morning's ministerial meeting, and even this is
unlikely to come before afternoon in the French capital.
Mr Fabius, who has
presided over the talks, had said earlier that the "conditions were never
better" for a strong and ambitious agreement.
Significant
progress had been reported on a range of issues, with evidence of real
compromise between the parties, the BBC's environment correspondent Matt
McGrath in Paris reported earlier.
He added that
countries supported a goal of keeping global temperature rises to 2C but agreed
to make their best efforts to keep it to 1.5C. However, the language on cutting
emissions in the long term was criticised for significantly watering down
ambition.
One
positive note came with the announcement that Brazil was willing to join the
so-called "high-ambition coalition" of countries including the EU,
the US and 79 countries. The alliance said it would push for an ambitious and
legally binding deal with a strong review mechanism.