Monsoon season in Singapore is very distinct from other countries. There are mainly two types of monsoon season in Singapore Northeast Monsoon Season (December-March) and Southwest Monsoon Season (June-September).
Northeast Monsoon has a “Wet phase” (December and January) and “Dry phase” (February and March). Wet phase contains heavy rainfall in the afternoon and early evening. Dry phase consist of little or no rainfall with cool and pleasant atmosphere. The Southwest monsoon season experiences showers with thunderstorm activities. Both monsoon seasons are separated by an Inter Monsoon Period.
It’s commonly hot and dry in May-July. According to the records November has the highest rain days and February has the lowest. Based on National Environment Agency, Singapore gets average of 2342.2mm rainfall in an year.