January in Singapore is the windiest and the coldest month of the year. In January, the weather in Singapore is typically hot. Average daily high temperature in January is about 29 degrees above zero. On average, Singapore has 23 rainy, 5 cloudy, 2 partly cloudy, and 1 sunny day in January. The rains are usually heavy. January as well as February, March, April, and May is considered the most uncomfortable time to visit Singapore.