Aemet has issued an orange alert for parts of Andalusia and the Balearic Islands through Thursday.
Other regions in Spain are also taking precautions, with the most vulnerable areas being the eastern and southern Mediterranean regions.
An orange alert indicates a significant meteorological event with a "dangerous level for normal activities."
In Valencia, some schools and sports activities were suspended, and sandbags were piled up to protect the center of Aldaia town.
Celeste Saulo, Secretary-General of the World Meteorological Organization, spoke at the opening of the COP29 Climate Summit, stating that the recent flooding in Spain sends a powerful message to the world.