"It's a catch-up, or catch-down, kind of effect," said Galvin Chia, an emerging markets strategist at NatWest Markets.
"There are some exceptional factors, but none of these would provide that kind of panacea for underlying risks that remain."
Indonesia's foreign exchange reserves fell by $1.4 billion last month to $130.8 billion, due to debt payments and Bank Indonesia's efforts to stabilise the rupiah.
read moreData for September also showed a surge in Indonesia's inflation to a seven-year high, reflecting a jump in fuel prices.
"If you look at consumption, look at credit growth, everything is domestic, unlike the other export markets in Asia.