AyrTC,
Lived in Singapore for 4 years.
During that time I remember it raining ALL day for less than 5 days total during the period. My general perception was that there were either heavy showere for ~45 min early in the morning or late in the afternoon.
Temps are NEVER colder than 25 (at night) and rarely warmer than 35 during the day.
Singapore is a lovely place but it is NOT a tourist destination. Lots of retail shopping.
C2J