Municipalities across Latin America and the Caribbean (LAC) are on the front lines of climate change as extreme weather events—floods, hurricanes, heat waves, droughts, coastal erosion, and landslides—grow more frequent, hitting lower-income communities hardest. This chapter assesses how increasingly affordable environmental monitoring and data-analysis technologies can help municipal leaders anticipate both sudden events and chronic, long-term risks, shorten the time from detection to action, and communicate those risks effectively to vulnerable populations.