The magnitude of impacts caused by climate variation on cities will depend on their resilience. The literature on the subject identifies urban green areas and their environmental services as a strategy to mitigate the urban heat island (ICU), a phenomenon of urban microclimate that has an impact on air quality, water and energy demand; central themes in urban sustainability. There are several researches that refer to the consolidation of green spaces in cities, in order to reduce environmental risks. Similarly, these studies recognise the need to assess environmental benefits, mainly in arid areas. This paper explores, through the analysis of environments and their corresponding temperatures, the role played by the highest urban park in the city as a thermal sink. The analysis was carried out in two phases, the first one aimed at classifying the different environments and their vegetation density; the second, corresponds to the monitoring campaign, using transects with data logger HOBO devices. The results, in addition to showing the suitability of the method, contribute to the evaluation of the benefits of green areas as thermal sinks and, with it, to lay the foundations for the establishment of an urban planning policy aimed at mitigating the ICU in the city, which contributes to the process of adaptation to climate change in cities with arid climate.