Category Archives: Regional Weather Outlook for Year 2025

Wetter conditions are predicted over much of the equatorial region and southwestern Maritime Continent in the next fortnight (15 – 28 September).

Drier conditions are predicted over central and northeastern Mainland Southeast Asia in Week 1 (15 – 21 September).

Cooler than usual temperatures are predicted in Week 1 (15 – 21 September) over the southwestern Maritime Continent and parts of the central equatorial region.

No coherent Madden-Julian Oscillation (MJO) signal was present at the start of September.
Most models predict no significant MJO activity during the forecast period.

The outlook is assessed for the region in general, where conditions are relative to the average conditions for the corresponding time of year. For specific updates on the national scale, the relevant ASEAN National Meteorological and Hydrological Services should be consulted.

Wetter conditions are predicted over much of the equatorial region in Week 2 (8 – 14 September).

No significant regional temperature anomalies are predicted in the next fortnight (1 – 14 September).

A Madden-Julian Oscillation (MJO) signal propagated from the Indian Ocean (Phases 2 and 3) towards the Maritime Continent (Phase 4) in the second half of August. Most models predict this signal to decay by the start of September, with no significant MJO activity predicted during the forecast period.

The outlook is assessed for the region in general, where conditions are relative to the average conditions for the corresponding time of year. For specific updates on the national scale, the relevant ASEAN National Meteorological and Hydrological Services should be consulted.

Drier conditions are predicted over central and eastern Mainland Southeast Asia in Week 1 (4 – 10 August). Wetter conditions are predicted over much of the mentioned area in Week 2 (11 – 17 August), with the highest likelihood over southern Mainland Southeast Asia.

Wetter conditions are predicted over much of the Maritime Continent during the next fortnight (4 – 17 August).

Warmer than usual temperatures are predicted over much of Mainland Southeast Asia in Week 1 (4 – 10 August), in line with the predicted drier conditions.

A Madden-Julian Oscillation (MJO) signal was present over the Western Pacific (Phase 7) during the last week of July. Most models predict this signal to weaken by the start of August. Most models predict an MJO signal to emerge in Phase 1 (Western Hemisphere) during Week 1, with some models predicting the signal to continue propagating eastwards to the Indian Ocean (Phase 2) during Week 2.

The outlook is assessed for the region in general, where conditions are relative to the average conditions for the corresponding time of year. For specific updates on the national scale, the relevant ASEAN National Meteorological and Hydrological Services should be consulted.

Drier conditions are predicted over much of the Maritime Continent and parts of southeastern Mainland Southeast Asia in the next fortnight (21 July – 3 August).

Wetter conditions are predicted over much of the rest of Mainland Southeast Asia and the very northeastern part of the Maritime Continent in Week 1 (21 – 27 July).

Warmer than usual temperatures are predicted over most of the Maritime Continent and parts of southeastern Mainland Southeast Asia in the next fortnight (21 July – 3 August), in line with the predicted drier conditions.

A Madden-Julian Oscillation (MJO) signal emerged over the Maritime Continent (Phase 4) during the second week of July. Most models predict this signal to propagate eastwards reaching the Western Pacific (Phases 6 and 7) by the end of Week 1. In Week 2, most models predict the MJO signal to weaken.

The outlook is assessed for the region in general, where conditions are relative to the average conditions for the corresponding time of year. For specific updates on the national scale, the relevant ASEAN National Meteorological and Hydrological Services should be consulted.

Drier conditions are predicted over southern Mainland Southeast Asia and parts of the northeastern Maritime Continent in the next fortnight (7 – 20 July).

Wetter conditions are predicted over much of northern Mainland Southeast Asia in Week 1 (7 – 13 July).

Warmer than usual temperatures are predicted over most of the Maritime Continent and southern Mainland Southeast Asia in the next fortnight (7 – 20 July).

There was no discernible Madden-Julian Oscillation (MJO) signal at the beginning of July. Most models predict no significant MJO activity during the forecast period.

The outlook is assessed for the region in general, where conditions are relative to the average conditions for the corresponding time of year. For specific updates on the national scale, the relevant ASEAN National Meteorological and Hydrological Services should be consulted.

Drier conditions are predicted over much of the western and central Maritime Continent in Week 1 (23 – 29 June). Drier conditions are then predicted over southern Mainland Southeast Asia and the southern half of the Philippines in Week 2 (30 June – 6 July).

Warmer than usual temperatures are predicted over most of the Maritime Continent in Week 1 (23 – 29 June). These warmer temperatures are predicted to persist over most of the Maritime Continent as well as develop over southern Mainland Southeast Asia in Week 2 (30 June – 6 July).

There was no Madden-Julian Oscillation (MJO) signal in the middle of June. Models predict no significant MJO activity during the forecast period.

The outlook is assessed for the region in general, where conditions are relative to the average conditions for the corresponding time of year. For specific updates on the national scale, the relevant ASEAN National Meteorological and Hydrological Services should be consulted.

Wetter conditions are predicted over parts of the northern ASEAN region in Week 1 (9 – 15 June), in particular over central and eastern Mainland Southeast Asia and the Philippines. Wetter conditions are also predicted over much of the southern ASEAN region in Week 2 (16 – 22 June).

Warmer than usual temperatures are predicted over most of the southern ASEAN region in Week 1 (9 – 15 June).

There were signs of a Madden-Julian Oscillation (MJO) signal developing over the eastern Maritime Continent (Phase 5) during the beginning of June. Most models predict the MJO signal to propagate eastwards to the Western Pacific (Phases 6 and 7) by the start of the forecast period before decaying by the end of the first week.

The outlook is assessed for the region in general, where conditions are relative to the average conditions for the corresponding time of year. For specific updates on the national scale, the relevant ASEAN National Meteorological and Hydrological Services should be consulted.

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 (2 – 8 June), drier than usual conditions for this time of the year are predicted.

For the Maritime Continent, drier conditions are predicted over the western and central equatorial region in Week 1 (26 May – 1 June). Wetter conditions are predicted over parts of the southern Maritime Continent in the next fortnight (26 May – 8 June).

Warmer than usual temperatures are predicted over much of the equatorial region in the next fortnight (26 May – 8 June). Warmer than usual temperatures are also predicted over the northeastern parts of Mainland Southeast Asia in Week 2 (2 – 8 June).

There has been no discernible Madden-Julian Oscillation (MJO) signal so far this month. Most models predict no MJO activity during the forecast period.

The outlook is assessed for the region in general, where conditions are relative to the average conditions for the corresponding time of year. For specific updates on the national scale, the relevant ASEAN National Meteorological and Hydrological Services should be consulted.

Wetter conditions are predicted over much of Mainland Southeast Asia in Week 1 (12 – 18 May). Wetter conditions are also predicted over parts of the southern Maritime Continent in Week 1.

Warmer than usual temperatures are predicted over parts of the central and western Maritime Continent in the next fortnight (12 – 25 May).

There was no discernible Madden-Julian Oscillation (MJO) signal by the end of the first week of May. Most models predict no MJO activity during the forecast period.

The outlook is assessed for the region in general, where conditions are relative to the average conditions for the corresponding time of year. For specific updates on the national scale, the relevant ASEAN National Meteorological and Hydrological Services should be consulted.