Most mosquito species in our study were found seasonally. An. minimus s.l. was most abundant during the transition from wet to dry season. In addition, this mosquito species was more abundant in indoor than outdoor collections. In comparison, An. maculatus s.l. was the most abundant species in the wet season in both indoor and outdoor collections, consistent with a previous study [8]. Furthermore, confirmation of Plasmodium-positivity in this mosquito highlights its role in malaria transmission during the wet season. An. annularis s.l. was detected at a similar season as An. minimus s.l., suggesting its importance in malaria transmission immediately after the wet season. Further information on each vector’s susceptibility to malaria parasites and their seasonality would be useful for vector control intervention planning which is an important tool to support malaria elimination in the region.