Forex Seasonality – September 2026: Can EUR/USD Extend its Gains to Three Straight Months?

Market impact: Mildly bullish bias for EUR/USD, but low conviction.

The news is not a new fundamental catalyst; it is a reminder that historical September seasonality may favor continuation of EUR/USD’s recent gains. If the pair were to extend its advance for a third consecutive month, that would reinforce momentum and could encourage trend-following flows, particularly if price strength is supported by falling U.S. yields or a narrowing expected Fed–ECB policy gap.

However, seasonality is only a statistical tendency, not a causal driver. Its signal is vulnerable to being overwhelmed by September’s major macro events, including U.S. employment and inflation data, Federal Reserve communication, ECB policy expectations, Eurozone activity indicators, and any renewed fiscal or political concerns in Europe. A stronger-than-expected U.S. data sequence would raise Treasury yields and support the dollar, potentially producing a sharp reversal despite a historically favorable EUR/USD pattern.

The key distinction is whether the recent EUR/USD gains reflect genuine repricing of relative monetary policy and growth prospects or merely short-term dollar selling and positioning. In the former case, seasonality could reinforce a medium-term continuation move. In the latter, the article’s bullish implication risks becoming a crowded consensus and a source of profit-taking.

Trading implications:

• Bullish interpretation: EUR/USD momentum persists if U.S. rate expectations soften, European data stabilize, and risk appetite remains firm.
• Bearish interpretation: A hawkish Fed repricing, stronger U.S. data, widening U.S.–German yield spreads, or a European political/fiscal shock invalidates the seasonal bias.
• Time horizon: Seasonality may influence positioning over September, but its practical value is primarily short- to medium-term and should not be treated as a standalone structural forecast.
• What to monitor next: U.S. payrolls and CPI, Fed and ECB guidance, two-year Treasury–German yield differentials, Eurozone PMIs/inflation, options positioning, and whether EUR/USD rallies are accompanied by broader dollar weakness rather than pair-specific euro strength.

Overall, the article supports a continuation bias rather than a decisive directional signal. Confirmation from interest-rate differentials and incoming macroeconomic data is essential.