A study of the temperature dependence of the gas-phase reactions of OH radicals and Cl atoms with a series of hydrofluroolefins: 2-fluoropropene (CH3CF=CH2), hexafluoroisobutylene ((CF3)(2)C=CH2) and (E/Z)-1,2,3,3,3pentafluoropropene ((E/Z)-CF3CF=CHF) has been performed. The relative-rate technique was used to determine rate coefficients over the temperature range 287-313 K. This work constitutes the first temperature dependence study of OH radicals and Cl atoms with 2-fluoropropene and (E/Z)-1,2,3,3,3-pentafluoropropene and for the reaction of Cl with hexafluoroisobutylene. Atmospheric implications are discussed with particular reference to the rate coefficients obtained as a function of the temperature.