Bandwidth tunability of supercontinuum (SC) spectrum, employing temperature as a control parameter is theoretically demonstrated, using a water core photonic crystal fiber (WPCF). The temperature dependent variation of refractive index is exposed via soliton fission process to show the temperature tunability of bandwidth of SC spectrum. It is found that the spectral width of SC light can be varied between 198 nm to 302 nm in the visible region, by changing the temperature of the WPCF between 55° C to 75° C.