FX.co ★ UK Monthly CPI Growth Eases to 0.4% in September, Extending Disinflation Trend

The United Kingdom’s Consumer Price Index (CPI) rose 0.4% month-over-month in September 2026, a slight slowdown from the 0.5% increase recorded in August 2026. The latest data, updated on 21 October 2026, point to a modest easing in short-term price pressures as the pace of monthly inflation continues to decelerate.

On a month-over-month basis, the comparison shows that price growth in September was weaker than in August, when the CPI expanded by 0.5% versus the previous month. The current 0.4% figure therefore signals a continuation of the disinflationary trend, with each successive month showing a smaller increase in consumer prices.

This month-over-month measure compares the change in prices in September to August, while the previous reading reflects the change in August relative to July. Investors and policymakers will likely view the softer September print as an incremental sign that inflationary momentum is cooling, though the pace of moderation remains gradual.