Strain data measured on the trunks of nineteen trees in the Danum Valley, Malaysia. It also contains wind speed data measured using anemometers attached to emergent trees nearby. This data can be used to extract the fundamental swaying frequencies of these trees, and to quantify the relationship between wind speed and bending strain and so estimate wind damage risk. This data would be useful for anyone studying the interaction between wind and trees. The tallest tree in this data set is approximately 51 m tall. Full details about this dataset can be found at https://doi.org/10.5285/657f420e-f956-4c33-b7d6-98c7a18aa07a