The Northern Iberian coastal shores host the last meridional kelp and marine forests in Europe (e.g. Laminaria hyperborea, Fucus serratus, Ascophylum nodosum). Upwelling is probably key for maintaining these cold-water seaweed’ species in the region. Therefore, it is essential to understand the regional trends and the influence of this phenomenon and its associated thermal (and nutrient) fluctuations on the populations exposed to and/or protected by it. To this end, Blueforesting has deployed temperature loggers to collect and analyze underwater temperature data to gain insight into the health and longevity of these vital habitats.