Singapore Temperature Market Guide

Singapore Changi Airport (WSSS) serves as the primary weather observation station for Singapore. Located on the eastern tip of the island, the airport sits at just 22 feet (7 meters) elevation with exposure to both the open sea and the island's interior.

Singapore's equatorial position ensures near-constant day length (approximately 12 hours year-round) and consistent solar heating. Temperature observations follow World Meteorological Organization standards.

The surrounding waters of the South China Sea and Strait of Malacca provide constant maritime influence.

Singapore has a tropical rainforest climate (Koppen: Af) with uniformly hot temperatures and high humidity throughout the year. There are no distinct seasons - only wetter and less wet periods.

Daily highs consistently reach 31-33°C (88-91°F) year-round. Daily lows rarely fall below 24°C (75°F). The temperature range between the warmest and coolest months is typically less than 2°C.

The Northeast Monsoon (November-March) brings wetter conditions, while the Southwest Monsoon (June-September) is slightly drier. Brief but intense afternoon thunderstorms occur year-round.

Northeast Monsoon (November - March): Wetter period with more persistent rain. Slightly cooler with more cloud cover. Maximum temperatures may struggle to reach 32°C on rainy days.

Inter-Monsoon (April - May): Transition period with lighter winds. Intense afternoon thunderstorms. Often the hottest period with occasional readings above 34°C.

Southwest Monsoon (June - September): Somewhat drier than Northeast Monsoon. Sumatra squalls can bring morning thunderstorms. Consistent temperatures.

Inter-Monsoon (October): Transition period with increasing rainfall. Variable conditions.

Singapore's temperature consistency is remarkable - expect daily highs between 31-33°C virtually every day. The forecast challenge is distinguishing between a 31°C day and a 33°C day.

Afternoon thunderstorms are the primary temperature modifier. Days with early or extensive thunderstorm activity will see lower maximum temperatures as cloud cover and rain limit heating.

The inter-monsoon periods (April-May, October) tend to produce the highest temperatures, with occasional readings above 34°C when thunderstorms fail to develop.

Haze events from Indonesian forest fires (typically August-October) can affect temperatures by reducing incoming solar radiation.

Meteorological Service Singapore provides detailed forecasts including thunderstorm probability, which is the key variable for temperature forecasting.

Thunderstorm Timing: The presence, timing, and intensity of afternoon thunderstorms determine whether temperatures reach 33°C or stay below 31°C.

Narrow Temperature Range: Distinguishing between outcomes within a 2-3°C range requires precise forecasting of cloud cover and convection.

Haze Events: Smoke haze from regional fires can reduce heating and create anomalously cool days.

Equatorial Consistency: The lack of seasonal variation means historical patterns provide limited guidance.

Record High: 37.0°C (98.6°F) recorded in April 1983.

Record Low: 19.4°C (66.9°F) recorded in January 1934.

Historical Note: Singapore's temperature extremes highlight the remarkable consistency of equatorial climates. The all-time record range of less than 18°C is among the smallest for any major city in the world.