The dataset provides raw infrared temperature data from a thermal camera at the Birmingham Institute for Forest Research Free Air CO2 Enrichment (BIFoR-FACE) experimental site from July 2021 to September 2023. The variable recorded is surface temperature, predominately of tree canopies (leaves, branches, stems). Data were collected in order to assess the impact of high CO2 on canopy temperatures and for greater understanding of plant temperature regulation. This site is a mature oak woodland, and the field of view of the camera includes one of the experimental CO2 enrichment plots, and numerous trees in the ambient un-enriched air. The trees included in the field of view are predominantly Quercus robur, with some individuals of Acer pseudoplatanus and Pinus sylvestris. Full details about this dataset can be found at https://doi.org/10.5285/71e0cc1b-59bd-4b7d-994c-fa4b1c9689d9