USD/CAD above 1.40 despite $102 oil: why the US-Canada rate gap is dominating

The Canadian dollar ended the week with a counterintuitive signal: oil is still above $100, yet the CAD keeps losing ground against the U.S. dollar. The Bank of Canada's official daily average for September 18 was 1.4002 CAD per USD, the highest reading of the month. In Reuters' 15:47 UTC snapshot, USD/CAD was at 1.4010 after touching 1.40144 intraday, while the loonie was on course for an eighth straight daily decline.

For CFD traders, the point is not that oil has stopped mattering. It is that a commodity-linked currency can be driven by several forces at once, and the rate differential is currently outweighing the support from crude.

Four drivers pulling USD/CAD in different directions

Reuters says Canada's two-year yield was about 142 basis points below its U.S. equivalent, the widest gap since July 28. Over the week, the Canadian dollar was down roughly 1%. That is the useful lesson: oil is an important Canadian-dollar driver, but it is not the only one and it does not always dominate.

Why high oil is not enough to strengthen CAD

Canada is a major energy exporter, so higher oil prices can improve its terms of trade and support the currency. But if U.S. yields rise faster than Canadian yields, U.S.-dollar assets can become relatively more attractive. The rate channel can therefore offset, or temporarily overpower, the commodity channel.

That is visible now. WTI was around $102.43 a barrel in Reuters' Friday snapshot, yet CAD remained weak. Our earlier analysis of Brent and WTI above $100 explained how energy feeds inflation and rates; in USD/CAD, that transmission is especially important because oil and monetary-policy differentials interact directly.

The Bank of Canada is not permanently on hold

The Bank of Canada held its policy rate at 2.25% on September 2 but said upside inflation risks had increased. Statistics Canada later reported August CPI at 3.0% year over year, unchanged from July, while CPI excluding gasoline accelerated to 2.4% from 2.2%. Reuters says markets assign roughly a 60% chance to a BoC hike on October 28.

That means the current rate gap is not guaranteed to keep widening. A more hawkish BoC repricing, or a decline in U.S. yields, could reduce dollar support even if oil does not move.

Three checks that matter more than a forecast

1. The two-year yield spread. If it keeps widening in favor of the U.S., the rates signal remains consistent with CAD weakness.

2. Oil persistence. WTI above $100 for several weeks carries a different macro signal from a short-lived spike, but it still needs to be read together with rates.

3. BoC repricing. Governor Tiff Macklem's comments and incoming Canadian data can quickly change expectations for October 28.

What not to infer

USD/CAD above 1.40 does not guarantee further Canadian-dollar weakness. High oil does not guarantee an immediate CAD rebound either. Correlations change weight as inflation, yield spreads and central-bank expectations change.

The practical takeaway is simple: the market is currently rewarding the US-Canada rate differential more than Canada's oil exposure. For CFD traders, identifying the dominant driver is more useful than relying on a fixed correlation.

Sources

• Reuters, September 18, 2026, Canadian dollar extends weekly decline, weighed by wider yield spreads: https://www.reuters.com/business/canadian-dollar-extends-weekly-decline-weighed-by-wider-yield-spreads-2026-09-18/
• Bank of Canada, Daily exchange rates: https://www.bankofcanada.ca/rates/exchange/daily-exchange-rates-lookup/
• Bank of Canada, September 2, 2026, policy rate 2.25%: https://www.bankofcanada.ca/2026/09/fad-press-release-2026-09-02/
• Federal Reserve, September 16, 2026, target range 3.75%-4.00%: https://www.federalreserve.gov/newsevents/pressreleases/monetary20260916a.htm
• Statistics Canada, August 2026 CPI: https://www150.statcan.gc.ca/n1/daily-quotidien/260914/dq260914a-eng.htm