The ATR 72-600 aircraft was accorded water salute as it landed at the Jaffna airport, about 400-km from capital Colombo.
Indian Space Research Organisation will announce a revised launch date later.
Despite the odd time, hordes of enthusiasts had reached the island, some of them travelling long distances on two wheelers, to witness the historic moment.
The RISAT-2B would replace the RISAT-2, which has been actively used by India to monitor activities in camps across the border in Pakistan to thwart infiltration bids by terrorists.
The 43.43 metre tall rocket lifted off at 5.28 pm from the second launch pad at the Satish Dhawan Space Centre in Sriharikota
PSLV C-29 blasted off from the Satish Dhawan Space Centre, about 110 km from Chennai, at 6 pm and released the six satellites one by one into a 550 km circular orbit.
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