Seasonal abundance of the phytophagous mite Oligonychus mangiferus and its predator Amblyseius swirskiiassociated with mango orchard trees was investigated at the experimental farm of the agriculture faculty of the Suez Canal University, Ismailia, Egypt. This study was carried out during two successive years from October 2014 to September 2016. Results showed that the temperature and moisture R.H.% were significantly affected the mean abundanceof the phytophagous mite O. mangiferus and its predator A. swirskiiassociated with mango orchard trees. The highest mean abundance of O. mangiferus was recorded in the summer season (2.96 ± 0.6 indv./leaf) and (1.33 ± 0.05 indv./leaf) for A. swirskii, respectively in the first year (from October 2014 to September 2015). On the other hand, the lowest mean abundance was recorded in the autumn (0.6 ± 0.11) for O. mangiferus, (0.23 ± 0.09 indv./leaf) for A. swirskii.  The mean abundance of  O. mangiferuspopulations  increased to (3.43 ± 0.7 indv./leaf)  in the second year of study in contrast to the populations of its predator. The results stated that the temperature had a significant effect on the population abundance of the phytophagous mite, O. mangiferus and its predator while the relative humidity had a negative effect on both populations.