For the town and archaeological site in Costa Rica, see Rivas District.
Rivas (Spanish pronunciation: [ˈriβas]) is a city and municipality in southwestern Nicaragua on the Isthmus of the same name. The city proper is the capital of the Department of Rivas and administrative centre for the surrounding municipality of the same name.
Rivas has a tropical savanna climate (Köppen climate classificationAw) with a short dry season from January to April and a lengthy wet season from May to October. Temperatures remain steady throughout the year with the dry season being slightly cooler and range from 25.5 °C (77.9 °F) in January to 27.7 °C (81.9 °F) in May. The average annual precipitation is 1,345 millimetres (53 in).