Singapore's climate is classified as equatorial, with no true distinct seasons. Owing to its geographical location and maritime exposure, its climate is characterized by uniform temperature and pressure, high humidity and abundant rainfall.. Temperatures remain high with daytime averages of 86°F (30°C). Humidity is usually above 75%. Singapore has two distinct monsoon seasons, the North Eastern season being from December to March and the South Western season from June to September. November and December is the rainy season. However unexpected downpour is very common.
June-August is considered to be the best time to visit, but even then it rains often. Don't let the climate stop you from going, however. Most buildings are air-conditioned and pains have been taken to make everything as comfortable as can be, all things considered. When it does rain, it's generally only for a short period. The local authorities have provided shaded footpaths in majority of the tourist locations including sub-urban residential districts, making it very convenient for travelers to visit at any time of the year. The shopping malls around Orchard Road are connected trough underground footpaths making the umbrella virtually useless.
For those who enjoy the sun and the beach, Singapore is an ideal place for beach lovers, as you get the hot sun throughout the year. So when you're in Singapore, just bring along your cooling apparels and hats.