Singapore sits almost exactly on the equator, just 137 kilometres north of it. This gives the city-state one of the most stable year-round climates anywhere in the world — daytime temperatures barely vary between January and July, and the sun rises and sets within a few minutes of 7 am and 7 pm in every month. Singapore has no real winter, no real summer, no cool season and no truly dry season.
Climate
Singapore has a tropical rainforest climate. Average daytime temperatures sit around 31°C year-round, while overnight lows rarely dip below 24°C. Humidity is consistently high, typically 75–90%, which makes the "feels-like" temperature significantly hotter than the thermometer reading. Rainfall is distributed throughout the year with no genuine dry season, averaging about 2,300 mm annually — more than London receives in four years.
The city experiences two monsoon peaks each year. The northeast monsoon from December to early March brings the heaviest rainfall, especially in December and January. The southwest monsoon from June to September brings slightly less rain but more unsettled weather with frequent afternoon thunderstorms. The transition months of April, May, October and November are known locally as the inter-monsoons.
Despite its location, Singapore is essentially outside the typhoon belt. Tropical cyclones almost never reach this close to the equator (the Coriolis force is too weak to sustain them). What Singapore does see is intense localised thunderstorms — dramatic, short-lived convective events that can drop 50–100 mm of rain in an hour and then clear entirely within 90 minutes.
Seasons
Northeast monsoon (December – early March)
The wettest period of the year. December is typically the wettest month with around 270 mm of rain. Skies are frequently overcast and heavy morning and afternoon downpours are common. Temperatures are a fraction cooler than the rest of the year — daytime highs around 30°C.
First inter-monsoon (April – May)
Transition period. Winds become light and variable. Afternoon thunderstorms are common but mornings are often clear and sunny. Temperatures are at their highest for the year — April and May regularly see highs of 33–34°C with oppressive humidity.
Southwest monsoon (June – September)
Rainfall is lower than in the northeast monsoon period but still frequent. Morning Sumatra squalls — line thunderstorms that form over the Strait of Malacca and sweep across the island — are a classic feature of this season. June to September is also when haze from forest fires in Sumatra can affect air quality; during bad haze years (2013, 2015, 2019), Singapore's air quality index can briefly enter hazardous levels.
Second inter-monsoon (October – November)
Light winds and frequent afternoon thunderstorms. Similar to April–May but slightly cooler. The haze risk fades as the southwest monsoon retreats.
Extreme weather events
Singapore's biggest weather-related concerns are localised flash flooding from intense thunderstorms and transboundary haze from Indonesian forest and peat fires. Major flash floods in 2010 and 2011 inundated Orchard Road, prompting significant investment in drainage upgrades. The 2013 and 2015 haze events pushed the Pollutant Standards Index above 400 — hazardous levels — and forced school closures. Singapore has never experienced a direct typhoon landfall and likely never will; the closest tropical cyclone on record was Typhoon Vamei in December 2001, a very rare equatorial system that formed just 1.5 degrees north of the equator.
Regional variation
Being only 50 kilometres across, Singapore does not have significant regional climate variation. However, the central catchment area (around Bukit Timah and the nature reserves) is typically 1–2°C cooler than the urban core around Orchard Road because of vegetation and lower urban heat island effect.
The southern and eastern coasts can be slightly drier than the central and western parts of the island because Sumatra squalls tend to weaken as they cross the island.
Best time to visit
Honestly, there is no "bad" time to visit Singapore for most travellers — temperatures and humidity are nearly identical year-round. The driest months on average are February, March and July, so if you want to minimise rain disruption, aim for those. Avoid September and October if haze is a concern — check the air quality forecast before booking. December and January are the wettest months but heavy rain tends to come in short intense bursts rather than all-day drizzle, so they're still perfectly viable travel times.
Climate facts
- Singapore is so close to the equator that the day length varies by only about 15 minutes between summer and winter — one of the smallest variations of any inhabited place on Earth.
- Typhoon Vamei in December 2001 is the only tropical cyclone in modern records to form and develop at latitudes below 1.5° north — it passed just north of Singapore as a tropical storm.
- Singapore uses a network of more than 50 rain gauges across the island to track intense localised thunderstorms; rainfall can differ by more than 100 mm on the same day between stations only 20 km apart.
- The city's NEWater recycling programme was partly motivated by climate resilience — Singapore is geographically dependent on water from Malaysia, and diversifying supply was seen as a strategic priority.