We investigate how the temperature influences the threshold cusps in meson-meson scatterings, i.e., pi-pi and DD*bar scatterings, using the production rates and propagators obtained at finite temperature. The line shape of production rate of pi-pi at different temperatures demonstrates that the cusp structure in pi-pi scattering is mildly enhanced as the temperature increases. For the pi-pi propagator, which includes isospin symmetry breaking, the line shape displays a unique plateaulike structure, and this structure will also be enhanced as the temperature increases. For comparison, the line shape of the D-D*bar propagator including isospin symmetry breaking is also investigated at different temperatures. As the temperature increases, its line shape shows a similar plateaulike structure but with some different properties when the temperature modifications to the masses and widths of D and D*bar are considered.
