The climate in Singapore is equatorial, ie hot, humid, and rainy throughout the year. The country, which is at the same time an island, a city, and a state, is actually at the Equator, in an area where there are always the conditions for the formation of showers and thunderstorms.
Although the climate is fairly uniform, there are some variations in the course of the year due to the two monsoons: the north-east monsoon, which occurs from November to early March and is more rainy, especially in the first part, and the south-west monsoon, which occurs from June to September. The first period between the two monsoon, from March to early June, is the hottest and the most unpleasant of the year.

Index:


Temperature



Temperatures in Singapore are quite uniform, since they only vary by a few degrees between the coolest and the warmest months. The minimum temperature ranges from 23 °C (73 °F) in December and January to 25 °C (77 °F) in May and June, while the maximum ranges from 30 °C (86 °F) in December and January to 32 °C (90 °F) in April and May.
Here are the average temperatures.
Singapore - Average temperatures
MonthJanFebMarAprMayJunJulAugSepOctNovDec
Min (°C)232424242525242424242423
Max (°C)303131323231313131313130
Min (°F)737575757777757575757573
Max (°F)868888909088888888888886

Even the records are close to the averages: at night, the temperature almost never drops to 20 °C (68 °F), while during the day, it rarely rises above 33/34 °C (91/93 °F). However, the weather is constantly hot and muggy, in fact, relative humidity doesn't usually go below 70% even in the warmest hours. If you add to this the urban heat island effect, which is typical of big cities, a phenomenon whereby the heat remains trapped between streets and buildings even at night, you will understand how the climate of Singapore is not pleasant for those who are not used to it. Sea breezes can relieve a little the heat in the harbor area and in the neighbourhoods along the coast, while apart from the breezes, there can be some wind only in January, February and March, ie in the second part of the northeast monsoon. For the rest, heat and flat calm dominate, at least within the city. Fortunately, buildings and means of transportation are equipped with air conditioning.

Rainfall



Throughout the year, about 2,400 millimeters (94.5 inches) of rain fall, with a peak of around 250 mm (10 in) per month in November, December, and January, while in the rest of the year, from 150 to 200 mm (6 to 8 in) fall per month, so there is no month without abundant rainfall. Here is the average precipitation.
Singapore - Average precipitation
MonthJanFebMarAprMayJunJulAugSepOctNovDecYear
Prec.(mm)2501752001951751701651901802102502652425
Prec.(in)9.86.97.97.76.96.76.57.57.18.39.810.495.5
Days171213151513131514161919181

From November to January, in addition to being more abundant, the rains are more frequent and last longer, and usually occur in the afternoon or in the evening.
In contrast, in the period of the south-west monsoon (from June to September), the so-called Sumatra squalls can occur: they are occasional thunderstorms, accompanied by wind gusts, which occur in the pre-dawn hours or in the morning, and are caused by a squall line coming from the island of Sumatra. On the other hand, in this period, there can be short thunderstorms in the afternoon. In addition to thunderstorms, during the period of the south-west monsoon, from the island of Sumatra, even clouds of smoke and haze caused by forest fires may arrive, which, in the worst occasions, can create a pall of unhealthy air, which can be dangerous for the population. In general, this can happen until mid-October.
In the city, many footpaths and walkways are covered, in order to protect passers-by from the rain.

Sunshine



The amount of sunshine is not very good, since there is an average of 5 or 6 hours of sunshine per day for most of the year. The least sunny months are November and December, with 4 hours of sunshine per day, while February is the sunniest, with 6,5 hours. We remind that the day at the Equator lasts 12 hours throughout the year. However, the equatorial sun is very strong, so you have to be careful even on cloudy days. Here are the average sunshine hours per day.
Singapore - Sunshine
MonthJanFebMarAprMayJunJulAugSepOctNovDec
Hours666666665544

Singapore

Sea temperature



Singapore is not exactly a destination for beach tourism, however, the sea is warm all year round.
Singapore - Sea temperature
MonthJanFebMarAprMayJunJulAugSepOctNovDec
Temp (°C)282828293030292929292928
Temp (°F)828282848686848484848482

Tropical cyclones



Being at the Equator, Singapore should be sheltered from tropical cyclones (called typhoons in the western Pacific). Very rarely, however, a cyclone can be formed at particularly low latitudes, as happened with Tropical Storm Vamei between Christmas and New Year of 2001, or the city can be marginally affected by cyclones passing over the area to the north. The cyclone and typhoon season lasts from May to December, with a peak of likelihood just in December, however, since the sea in this area is always warm, tropical storms can in theory occur in any season.

Best Time



Although there is no big difference between the periods, the best month to visit Singapore is probably February: it is the sunniest, and there are "only" 12 days with rain on average. November and December are among the cooler months, but they are also the wettest: it rains almost every day, and sometimes, the rain lasts more than in the other seasons. January and February, in the second part of the "winter" monsoon, are less rainy, and in any case, they are not as muggy as March, April and May, also because they are the only months when there is a bit of wind. After the hot period from March to early June, July and August are also fine, if you can only go in this period: all in all, the difference with January and February is small.

What to pack



All year round: bring tropics-friendly, loose-fitting clothing, a scarf for the breeze, a light sweatshirt and pashmina for airconditioned places, and a light raincoat or umbrella.
When going to the reef, you can bring snorkeling equipment, including water shoes or rubber-soled shoes.

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