• Alert Level 0 | End of Dry Season for the Mekong sub-region
  • The downgrade of Alert Level 1 to Alert Level 0 indicates the end of dry season for the Mekong sub-region. The regional haze situation will be updated daily at 0900 UTC.

Regional Haze Situation

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MSSModerate Haze MSSDense Haze MSS 2500 ft Wind MSSLow Confidence Hotspot MSSMedium Confidence Hotspot MSSHigh Confidence Hotspot

MSS Wind Speed (km/h) MSS Rainfall (mm)

Latest Weather and Haze Situation

Wet weather and cloudy conditions were observed over many parts of the ASEAN region today except for the northern and central Mekong sub-region, parts of Sumatra and Peninsular Malaysia, where relatively drier conditions were observed. Isolated hotspots were detected mainly in Viet Nam. There were also a few hotspots in Sumatra, Cambodia and Lao PDR. No significant smoke plumes were observed from the satellite imagery under extensive cloud cover.

Weather and Haze Outlook

Over the next few days, wet conditions are forecast to prevail over most parts of the ASEAN region. However, drier conditions are forecast to continue mainly over parts of Sumatra, Peninsular Malaysia, Java and the Lesser Sunda Islands, which may contribute to increased hotspot activities with localised smoke haze in these areas. The prevailing winds north of the Equator are forecast to blow mainly from the southwest or west, while the prevailing winds south of the Equator are expected to blow from the east or southeast.

  • 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 May – July 2025

Summary of Outlook

The Northeast Monsoon has transitioned into the inter-monsoon period during the first half of April 2025. Climatologically, the inter-monsoon conditions persist over the ASEAN region during May, marked by light winds that vary in direction across most areas in the region. While scattered to widespread rainfall is typical over the ASEAN region, brief dry spells can still occur in various parts of the region. By late May, the Southwest Monsoon usually begins to establish itself, as the predominant winds shift to blow from the southeast or southwest. During this period, the southern ASEAN region gradually experiences drier conditions while wet weather continues over the northern ASEAN region as the monsoon rainband shifts further northwards.

For May 2025, above-normal rainfall is predicted for much of the eastern Maritime Continent and near- to above-normal rainfall for parts of Mainland Southeast Asia. The above-normal rainfall is predicted to persist over May to July (MJJ), with below-normal rainfall predicted over the western Maritime Continent. ENSO-neutral conditions are predicted during May to June 2025. The Indian Ocean Dipole (IOD) is currently neutral. Above-normal temperature is predicted for the Maritime Continent and near- to above-normal temperature for Mainland Southeast Asia for May, and above-normal temperature for most of Southeast Asia for MJJ 2025.

The return of shower activities over most of the northern ASEAN region at the beginning of the forecast period should help reduce both the hotspot activity and transboundary haze occurrence across the Mekong sub-region. As the southern ASEAN region enters its typical dry season around the middle of the forecast period, an increase in hotspot activity with localised smoke plumes may be expected, particularly in areas with below-normal rainfall. There is also be a risk of transboundary smoke haze occurrence during June and July under the prevailing southeasterly or southwesterly winds, especially over areas experiencing extended dry conditions.

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The ASEAN Climate Outlook Forum (ASEANCOF) is an avenue to collaboratively develop consensus-based seasonal climate outlooks and related information on a regional scale.

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ASEAN Haze Online

Recent Updates

21

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Subseasonal Weather Outlook (26 May – 8 June 2025)
For western and central Mainland Southeast Asia, wetter conditions are predicted in Week 1 (26 May – 1 June). For the same region in Week 2 …
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09

May

Review of Regional Haze Situation for April 2025
During April 2025, the Northeast Monsoon transitioned into the Inter-monsoon conditions as the monsoon band shifted northwards towards the Equator. The period was characterized by the light and variable winds across…
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07

May

Subseasonal Weather Outlook (12 – 25 May 2025)
Wetter conditions are predicted over much of Mainland Southeast Asia in Week 1 (12 – 18 May). Wetter conditions are also predicted over…
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