Studies on “population dynamics of Cabbage Aphid (Brevicoryne brassicae L.) on Kale (Brassica oleracea var. acephala)’’ in relation to weather parameters revealed cabbage aphid (Brevicoryne brassicae L.) as a major pest on Kale. The incidence of cabbage aphid commenced from 16th standard meteorological week (SMW) with a population of 2.02 (aphids/plant). The population of cabbage aphid started increasing and reached its peak in 25th SMW with a population of 137.16 (aphids/plant) after that the population started declining gradually in 26th SMW with a population of 83.14 (aphids/plant). However, the mean population of nymphs during 16th SMW was (2.02 ± 0.46) which gradually started increasing and was highest in 25th SMW (32.68 ± 0.74). The mean population of adults during 17th SMW was (8.24 ± 0.38) and was highest during 25th SMW (62.12 ± 0.50) and the mean population of winged aphids during 18th SMW was (7.10 ± 0.42) which gradually started increasing and attained its peak during 25th SMW (42.36 ± 0.41) respectively. Correlation between maximum and minimum temperature showed positive correlation with cabbage aphid population. Relative humidity of morning showed non-significant negative correlation while relative humidity of evening exhibited positive non-significant correlation. Rainfall were found non-significant positive correlation.