Key Takeaways
- • Southwest Monsoon conditions are expected to persist throughout the second fortnight of August 2026, with winds predominantly from the southeast or southwest direction.
- • Daily maximum temperatures are forecasted to range between 33°C and 34°C on most days, with occasional peaks reaching 35°C, while nighttime temperatures are expected to remain warm and humid above 27°C.
- • Localized short-duration thundery showers are anticipated during late morning and afternoon periods on some days, with total rainfall predicted to be below average across most of the island.
- • Regional dry conditions in Sumatra and Kalimantan present a haze risk; Singapore may experience degraded air quality should fires intensify under prevailing wind patterns, with the National Environment Agency (NEA) monitoring the situation for potential daily advisories.
- • Several fair and occasionally windy days are expected interspersed with shower activity, with the NEA providing ongoing updates through official weather channels and the myENV app.
Summary
Singapore's weather outlook for the second fortnight of August 2026 reflects prevailing Southwest Monsoon conditions, which are expected to remain stable throughout the period with winds blowing from the southeast or southwest. According to official guidance from the Meteorological Service Singapore (MSS) and the National Environment Agency (NEA), this pattern will shape temperature and precipitation patterns across the island.
Temperature conditions are anticipated to be consistently warm, with daily maximum temperatures ranging between 33°C and 34°C on most days, punctuated by occasional spikes to 35°C on a few days. Nighttime conditions will remain warm and humid, with temperatures expected to stay above 27°C on most nights, limiting relief during evening hours. This thermal profile is typical of Southwest Monsoon conditions in this region during mid-August.
Rainfall activity will be characterized by localized short-duration thundery showers occurring during late morning and afternoon periods on some days. Importantly, the total rainfall for the second fortnight is forecast to be below average across most areas of the island. The pattern will also feature several fair and occasionally windy days, providing periodic breaks in shower activity. On a limited number of days, the passage of Sumatra squalls may bring more widespread thundery showers and gusty winds during pre-dawn and morning hours.
Regional air quality presents a secondary concern. Dry conditions persisting across Sumatra and Kalimantan have generated observable hotspots with smoke plumes, particularly in the southern and central regions of Sumatra and various parts of Kalimantan. Given prevailing southeasterly and southwesterly wind patterns, Singapore faces potential exposure to transboundary haze should fire activity intensify. The NEA has indicated it will maintain close monitoring of the situation and issue daily haze advisories if the 24-hour Pollutant Standards Index (PSI) enters the Unhealthy range. Official updates remain available through the MSS website, NEA website, and the myENV mobile application.
Temperature conditions are anticipated to be consistently warm, with daily maximum temperatures ranging between 33°C and 34°C on most days, punctuated by occasional spikes to 35°C on a few days. Nighttime conditions will remain warm and humid, with temperatures expected to stay above 27°C on most nights, limiting relief during evening hours. This thermal profile is typical of Southwest Monsoon conditions in this region during mid-August.
Rainfall activity will be characterized by localized short-duration thundery showers occurring during late morning and afternoon periods on some days. Importantly, the total rainfall for the second fortnight is forecast to be below average across most areas of the island. The pattern will also feature several fair and occasionally windy days, providing periodic breaks in shower activity. On a limited number of days, the passage of Sumatra squalls may bring more widespread thundery showers and gusty winds during pre-dawn and morning hours.
Regional air quality presents a secondary concern. Dry conditions persisting across Sumatra and Kalimantan have generated observable hotspots with smoke plumes, particularly in the southern and central regions of Sumatra and various parts of Kalimantan. Given prevailing southeasterly and southwesterly wind patterns, Singapore faces potential exposure to transboundary haze should fire activity intensify. The NEA has indicated it will maintain close monitoring of the situation and issue daily haze advisories if the 24-hour Pollutant Standards Index (PSI) enters the Unhealthy range. Official updates remain available through the MSS website, NEA website, and the myENV mobile application.
Go deeper than the headline
Research every firm in this story, track the ones that matter and get the daily briefing — free for 7 days.