Cicadulina bipunctata (Melichar) (Homoptera: Cicadellidae) is a pest of the second planting of forage maize in central Kyushu, Japan. The effect of temperature on the development and reproduction of C. bipunctata was examined in laboratory experiments. The survivorship of eggs and nymphs was the highest at 25.3°C. The developmental periods of eggs and nymphs were significantly shortened as the temperature was increased up to 34.0°C. The developmental zero (T₀) was estimated at 14.0°C for eggs and female nymphs, 14.2°C for male nymphs, and 15.9°C for preoviposition period. A thermal constant (K) of 118.1, 182.7, 176.9, and 39.5 degree-days was estimated as the effective temperature sums for the development of the eggs, female nymphs, male nymphs, and preoviposition period, respectively. Adult longevity and fecundity were higher than those of other rice-associated leafhoppers, while net reproductive rate (R₀) and intrinsic rate of natural increase (r_m) were lower than those of other rice-associated leafhoppers. An increase of 1.29 and 1.43 generations per year following global warming was estimated for C. bipunctata by 2100, relative to 1990, in Kumamoto and Miyazaki, Japan, respectively. Thus, C. bipunctata has the potential to become a serious pest of cereal crops other than the second planting of forage maize.