The rise in petrol prices has mainly caused inflation to continue climbing. In September, the Consumer Price Index (CPI) increased by six tenths, reaching 4.9%, its highest rate since February 2023, according to data from the National Institute of Statistics (INE).
As detailed, among the groups that had the most positive influence on the annual rate is transport, whose annual variation rose by one point to 10.5%.
This increase was mainly due to the prices of fuels and lubricants for personal vehicles, which rose by 27.7% while in September 2025 they decreased. Also, to the prices of passenger transport by air, which decreased to a lesser extent than last year.
In fact, compared to last year, the cost of diesel has increased by 34% and petrol by 27.5%.
Additionally, the group of recreational activities, sports and culture recorded an annual rate of 3.6%, which was almost two and a half points higher than last month. This behaviour was due to the prices of tourist packages, which decreased less than in the same month of 2025.
By Autonomous Communities, positive annual rates were recorded in all. Castilla-La Mancha and Galicia showed the largest increases (5.5%) and Canary Islands and Aragon the smallest (4.4%).
For its part, the core inflation rate, that is, the general index excluding unprocessed food and energy products, stood at 3.1%, two tenths above that of the previous month. It is its highest rate since March 2024.
The Harmonised Index of Consumer Prices (HICP) stood at 5%, four tenths more than the previous month.