Multinational Observer Group co-ordinator Andrew Goledzinowski, from Canberra, said it was too early to form any judgements about whether the election was "fair and free".
He said the group would reserve any comments until tomorrow after the 92 observers, including a team from New Zealand, met for a debrief.
"The observations is not just on today, but today is a very important part of it," Mr Goledzinowski said.
"The Fiji authorities have taken this (election) very seriously...and I think it's reasonable to say at this stage that they have done the best they can to meet the challenges."
The Fiji vote will decide on the next government to lead the country for the next four years.
The country has been under the charge of Mr Bainimarama since he seized power to become prime minister after a military coup in 2006.
Supervisor of Elections Mohammed Saneem said there has been "a huge amount of enthusiasm" on the elections and believed there will be a high turn out.
He said that while his office and staff were ready for today, there could still be factors beyond their control.
"We have contingency plans in place and we will ensure that there is a smooth operation."