In the present study, the spatial and temporal behaviour of daily rainfall is analyzed using the daily rainfall concentration index with a resolution of 1, 5 and 10 millimetres for 24 meteorological stations in the period 1961-2018. The index calculated with a resolution of 1 mm takes values between 0.58 and 0.67, without a defined pattern of spatial behaviour. The CI (5 and 10 mm) decrease and a spatial north-south gradient become noticeable. Analyzing the trends, the number of stations with significant negative trends is similar to positive ones, however, in magnitude, positive ones are higher on average. This increase in the concentration of precipitation could become a risk depending on the evolution of the associated precipitation.