This dataset contains daily averaged physical and chemical parameters measured during a mesocosm experiment conducted at Sea Surface Facility (SUR) in Wilhelmshaven, Germany (53.5148° N, 8.1461° E) in 2023. Parameters include daily average air temperature, Daily Average Incoming Solar Irradiance, Daily Average Reflected Solar Irradiance, and Daily Average Albedo derived from in situ measurements. The dataset provides an overview of environmental conditions throughout the experiment, supporting the interpretation of biogeochemical and ecological processes described in the related publication Bibi et al., 2025.