The experiment was conducted at the Arid Zone Research Institute (AZRI), Bhakkar, Pakistan during 2018 and 2019 on different mungbean genotypes to find a resistant to thrips and to determine the impact of weather factors on the Megalurothrips distalis population. In 2018 twenty-five mungbean genotypes were screened against M. distalis. During 2019 three genotypes each of resistant (13TM-04, AZRI-06, NM-16), susceptible (Dera-M, Sawat-I, NM-98) and intermediate reaction (NM-06, 12TM-03, NM-11) towards thrips infestation were chosen for final screening based on per flower thrips population density at 4 days intervals commencing from the first appearance of thrips up to maturity stage of the crop. Maximum HPSI, 15% was recorded in Dera -M while the minimum was recorded on 13TM-04 and NM-16 with 8% of each. Yield and the yield contributing characteristics were also assessed from which NM-16 and 13TM-04 exhibited statistically similar results and produced the highest yields at 935 and 902.8 kg/ha respectively. During both study years and on cumulative basis thrips population fluctuation had positive results and showed a significant correlation with maximum and average temperature. The average number of thrips during 2018, 2019 as well as both years combined showed a non-significant correlation with minimum temperature while negative and highly significant correlation was observed with average relative humidity and rainfall. Maximum temperature was the most important factor which contributed maximum i.e. 51.1% and 55.8% role followed by rainfall which showed 14.8% and 4% role during 2018 and 2019 respectively in the fluctuation of thrips population.