The Seaweed In Nuclear Winter Data Repository contains all the necessary environmental data to run the Seaweed Growth Model and simulate the potential growth of seaweed in the aftermath of a nuclear war. This data is derived from ocean simulations for a nuclear winter scenario and includes a control run and simulations for different levels of soot emissions into the atmosphere, ranging from 5 to 150 Tg. The data in this repository can be used as input for the Seaweed Growth Model, which is available in a separate repository (https://github.com/allfed/Seaweed-Growth-Model). The model simulates the growth of seaweed in a nuclear winter scenario. Instructions on how to run it can be found in the code repository.