The Group D match is due to kick off at 6pm UK time but the Marin Anastasovici Stadium in Giurgiu is shrouded in mist.
However, match officials have decided to allow the game to kick-off.
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Celtic beat the Romanian side 2-1 in Glasgow last month and another victory would all but seal their place in the knockout phase.
The Scottish champions are level with Salzburg on seven points from three games at the top of Group D.
Dinamo Zagreb are four points behind, with Astra pointless at the bottom of the group.
The top two qualify for the last 32.
Dinamo host Salzburg tonight in Croatia.
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