Singapore is a sovereign republic comprising the main island of Singapore and smaller outlying islands which are located at the southern tip of the Malay Peninsula in Southeast Asia. Singapore lies 137 kilometres north of the equator, south of the Malaysian state of Johor and north of Indonesia's Riau Islands. Singapore is one of three remaining true city-states in the world. It is the second smallest nation in Asia.
Singapore has a tropical rainforest climate with no distinctive seasons, uniform temperature and pressure, high humidity, and abundant rainfall. Temperatures usually range from 23 to 32°C. Relative humidity averages around 79% in the morning and 73% in the afternoon. April and May are the hottest months, with the wetter monsoon season from November to January. From July to October, there is often haze caused by bush fires in neighbouring Indonesia.