The climate in the Sierra de Aracena Natural Park is both sub-humid and dry Mediterranean, with hot dry summers and considerable rainfall from autumn through to spring. These contrasts are a direct result of the air currents entering from the Atlantic coast and cooling as they reach the hills and mountains in the Natural Park.
The lack of high terrain results however in a generally mild climate, particularly in winter. The average January daytime temperature in Aracena is 7º, 15º in the nearby hills during May, and climbing to 25º in the outlying villages in August, although maximum temperatures may exceptionally exceed 36º. The best times of year for walking are therefore outside of the summer months. In contrast, the colder weather associated with the period between December and February is ideal for the curing of Iberian hams.
The difference in rainfall is marked, from the 1,200 litres/m2 in the central part of the Sierra de Aracena Natural Park to 800 litres on the outskirts. Some 80% of annual rainfall occurs between October and March, and it is not unknown for an attractive light dusting of snow on the higher peaks.