Won and Asian FX: KRW, TWD, INR and ASEAN Currencies — 2026-09-21
The won snapped an eight-day losing run on Sept 21, closing in the low 1,380s as exporters stepped up dollar sales ahead of the Chuseok holiday. The rupiah was Asia's weakest link, brushing Rp17,783–17,847 as Bank Indonesia intervened against a backdrop of Middle East tensions and rising US yields. The rupee firmed to 95.81, with Brent's retreat and RBI support keeping the 96 threshold at bay.
Won and Asian FX: KRW, TWD, INR and ASEAN Currencies — 2026-09-21
Top developments
Won closes lower for first time in eight sessions as Chuseok exporter negos land
The dollar-won rate fell for the first time in eight trading days on Sept 21, finishing in the low 1,380s after exporters scaled up dollar-selling (nego) volumes ahead of the Chuseok holiday, according to BetaNews. As of 21 Sept morning, USD/KRW was quoted around 1,380.70, down 2.60 won from the previous Seoul close of 1,383.30, with topside capped by wariness of actual Japanese intervention supporting the yen and by exporter supply, Yonhap Infomax reported. Korea Investment & Securities analysts argue the post-FOMC drift higher toward 1,377 is not a trend reversal, a view reported by CBC News. The interplay of pre-holiday negos and the offshore NDF channel will set the tone for daily closes through the holiday window.
Rupiah Asia's worst performer; BI keeps intervening as it nears Rp18,000
The rupiah weakened 25 points, or 0.14%, to Rp17,783 per dollar at the start of Monday trading, pressured by higher oil prices and portfolio outflows, Suara reported, citing BI. The currency hit Rp17,847 at one point, with Bank Indonesia confirming continued market intervention and stabilization via monetary operations — and local banks flag risk of the rupiah breaching Rp18,000 on geopolitics. BI officials blamed Middle East geopolitics for making the rupiah the worst-performing currency in Asia on the day and pledged ongoing spot intervention. That keeps BI's smoothing operations a key intraday anchor for the daily fix.
Rupee firms to 95.81 as Brent slides; RBI defense noted against 96
The rupee rose 15 paise to close at 95.81 on Monday (Sept 21), helped by falling Brent crude and constructive Indian equities plus US–Iran talks sentiment, AajTak reported. It had opened 24 paise stronger at 95.72, per Press Trust of India copy carried by ThePrint Hindi and Prabhasakshi. Hindi market commentary (Whalesbook) highlighted RBI intervention, crude prices and a heavy IPO calendar (20 upcoming listings) as the swing factors for whether 96 gets tested. A previous RBI-supported close at 95.93 earlier in the week shows the central bank is actively smoothing the pair.
Bearish bets deepen across EM Asia on dollar strength and oil — Reuters poll
A Reuters positioning poll published Sept 17 showed bearish sentiment toward most emerging Asian currencies deepened, driven by Middle East escalation and rising US Treasury yields. The biweekly poll covers NDF-inclusive positioning in nine currencies — yuan, won, Singapore dollar, rupiah, Taiwan dollar, rupee, peso ringgit and baht — on a scale where plus 3 is fully long dollars. For NDF watchers, this confirms crowded short positioning across the region, raising the risk of sharp squeezes if dollar momentum or oil reverses.
Local view
Korean-language coverage is dominated by holiday-season flows: Yonhap Infomax flags top-side resistance from the risk of actual Japanese yen intervention plus exporter negos keeping USD/KRW in the mid-1,380s; THE Biz echoes the yen-strength-plus-Chuseok-nego mix pointing to a mid-1,380s decline; and Newsis carries a medium-term won-bull warning — one economist sees the rate potentially falling back toward 1,200 over the medium term, though Kospi overvaluation could cap equity inflows. Indonesian media uniformly frame BI as defending the rupiah: Bisnis.com quotes bankers saying BI's rate-cut room is narrowing sharply because of Fed pressure and the currency — a constraint that matters if oil stays high; Kontan reports BI attributing the softness to Middle East tensions and pledging continued action.
Context & numbers
- USD/KRW: closed 1,383.30 on Sept 18; Sept 21 fell for the first time in eight sessions, low-1,380s close; intraday Sept 16 saw a 9.2-won jump to 1,368.6 per Newspim
- USD/IDR: JISDOR reference Rp17,635 on Sept 14; Rp17,758 at bank counters on Sept 21; spotRp17,783–17,847 intraday, with Rp18,000 flagged as breakout risk
- USD/INR: week ended Sept 18 saw the rupee slip marginally 95.72 → 95.79; Monday Sept 21 close 95.81
- India forex reserves fell $4.92 billion in the latest week, stoking questions about whether RBI sold dollars to support the rupee
On the radar
- Korea's Chuseok holiday window: thin onshore liquidity plus heavy pre-holiday negos mean NDF markets will drive the daily won close until onshores reopen
- Fed/BOJ policy meetings flagged as looming macro catalysts for regional FX by Investing.com last week — any hint of actual Japanese FX intervention would rip through the won and NDFs
- Resistance watch on USD/INR at the 96 psychological level, with 20 new IPOs listing this month — inflows could tip the balance either way (market commentary, not a consensus view)
- BI's dual constraint: intervention-led rupiah defense narrowing rate-cut room — every oil move now doubles as a BI policy signal
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