Regional Haze Situation

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Latest Weather and Haze Situation

Shower activities and cloudy conditions prevailed over most parts of the ASEAN region today. Few to isolated hotspots were detected in Cambodia, Lao PDR, Thailand, Sarawak, Sumatra and Viet Nam, while scattered hotspots were detected mostly in the western and central parts of Kalimantan. Elsewhere, the hotspot and smoke haze situation could not be fully assessed under the cloudy conditions in the region that obscured satellite observation of the ground.

Weather and Haze Outlook

Over the next few days, scattered showers are expected to continue over most parts of the ASEAN region, except for the Lesser Sunda Islands, where drier weather is forecast to prevail. Hotspots and smoke haze activities are expected to remain subdued. The prevailing winds over the northern ASEAN Region are mostly forecast to be variable in direction, while the prevailing winds over the southern ASEAN region are expected to blow from the southeast or west.

  • All maps are to be used solely for displaying meteorological/geophysical information, and not for any other purpose. All maps are not to scale and for illustrative purpose only.
  • The hotspots depicted on the map are derived from the NOAA satellite and they represent locations with possible fires. Hotspots may go undetected due to cloudy conditions or incomplete satellite pass.
  • At Alert Level 0 and Alert Level 1, the regional haze situation is updated once a day at 0900 UTC. The regional haze situation is updated more frequently at 0300 UTC and 0900 UTC upon activation of Alert Level 2 or Alert Level 3. Updates at 0300 UTC display hotspot information from night-time passes of the NOAA-20 satellite. Fewer hotspots were typically detected at night as fire activities usually peak during the day.
  • Reprocessed satellite data will be availed at a later timing. The hotspot information derived from satellite data reprocessed may differ slightly from that received near real-time but reprocessing is necessary for better quality data.
  • The 2500 ft winds (depicted by arrows) are model analysis winds.

Seasonal Forecast for September – November 2025

Summary of Outlook

In August 2025, Southwest Monsoon conditions persisted over the ASEAN region, characterised by wet weather over the northern ASEAN region and drier conditions over the southern ASEAN region. The low-level winds over the region blew mainly from the southeast or southwest. From the latter half of October, the Southwest Monsoon conditions typically transition into the inter-monsoon period as the monsoon rainband shifts southwards towards the Equator. During this period, the equatorial region usually experiences increased shower activity and the prevailing winds are likely to turn light and variable in direction.

For the September to November (SON) 2025 period, above-normal rainfall is predicted for much of the Maritime Continent and eastern Mainland Southeast Asia. ENSO neutral conditions are predicted for September, with the potential for La Niña conditions to develop in October – November 2025. There are signs of a negative Indian Ocean Dipole (IOD) developing, with models predict negative IOD conditions throughout September – November 2025. Both La Niña and negative IOD events tend to bring wetter conditions to parts of Southeast Asia. Above-normal temperature is predicted for much of Southeast Asia for SON 2025.

The traditional dry season over the southern ASEAN region is likely to last until October 2025. While above-normal rainfall is forecast over most parts of the region, drier conditions can still be expected at times, particularly over Peninsular Malaysia and the northern and central parts of Sumatra, where below-normal rainfall is forecast. There remains a risk of transboundary smoke haze as hotspots with smoke plumes/haze may develop in fire-prone areas, particularly during periods of drier conditions. On the other hand, over the northern ASEAN region, the overall hotspot and smoke haze situation is expected to remain subdued under the wet weather conditions throughout the outlook period.

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Recent Updates

08

Oct

Subseasonal Weather Outlook (13 – 26 October 2025)
Wetter conditions are predicted over most of the southern Maritime Continent in the next fortnight (13 – 26 October). Warmer than usual temperatures for this time of the year are predicted over northern Mainland Southeast Asia in…
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08

Oct

Review of Regional Haze Situation for September 2025
Southwest monsoon conditions persisted over the ASEAN region in September 2025. The prevailing low-level winds blew mainly from the southeast over areas south of the Equator and turned to blow from the southwest or west over areas…
More details

24

Sep

Subseasonal Weather Outlook (29 September – 12 October 2025)
Wetter conditions are predicted over much of the central and southern Maritime Continent in the next fortnight (29 September – 12 October). No significant regional temperature anomalies are predicted in…
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