This paper reports on new experimental results on the temperature-dependent phase-matching properties of LiGaS 2 for second-harmonic generation and sum-frequency generation in the 0.820–10.5910 μm spectral range. In addition, we present a thermo-optic dispersion formula that provides a good reproduction of the present experimental results when combined with the Sellmeier equations presented in our previous paper, Kato et al. [Opt. Lett. 42, 4363 (2017)].