Category Archives: Regional Weather Outlook for Year 2025

Wetter conditions are predicted over parts of the northeastern Maritime Continent in the next fortnight (28 April – 11 May). Wetter conditions are also predicted in Week 1 (28 April – 4 May) over most of Mainland Southeast Asia, apart from the southeastern portion.

Drier conditions are predicted over much of the central Maritime Continent in Week 1 (28 April – 4 May).

No significant regional temperature anomalies are expected in the next fortnight (28 April – 11 May).

There was no discernible Madden-Julian Oscillation (MJO) signal during mid-April, based on the RMM Index. Most models predict a weak MJO signal to propagate from the Western Pacific (Phase 7) to the Western Hemisphere (Phase 8) in Week 1, before decaying in Week 2. The other models predict no discernible 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 western Mainland Southeast Asia and the northwestern Maritime Continent in Week 1 (14 – 20 April). Wetter conditions are also predicted over the southeastern Maritime Continent in the next fortnight (14 – 27 April).

Drier conditions are predicted over eastern Mainland Southeast Asia and parts of the northeastern Maritime Continent in Week 1 (14 – 20 April).

Cooler than usual temperature for this time of year is predicted for parts of western and central Mainland Southeast Asia in Week 1 (14 – 20 April). Warmer than usual temperature is predicted over parts of the northeastern Maritime Continent in the next fortnight (14 – 27 April).

No Madden-Julian Oscillation (MJO) signal was present during the first week of April. Some models predict an MJO signal to emerge over the Western Pacific (Phase 6 or 7) in Week 1, before propagating to the Western Hemisphere and Africa (Phases 8 and 1) in Week 2, while the rest of the models predict no significant MJO activity.

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 eastern Maritime Continent in the next fortnight (31 March – 13 April).

Warmer conditions are predicted over much of the equatorial region in Week 2 (7 – 13 April).

A Madden-Julian Oscillation (MJO) signal was present over the Western Pacific (Phase 6) towards the end of March, based on the RMM Index. Most models predict this signal to weaken and become inactive by the start of the forecast period. Models disagree on the evolution of the MJO signal thereafter.

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 Maritime Continent in Week 1 (17 – 23 March). The wetter conditions are predicted to persist over the northeastern Maritime Continent in Week 2 (24 – 30 March).

Drier conditions are predicted over central and eastern Mainland Southeast Asia in Week 1 (17 – 23 March).

Cooler than usual temperature is predicted over central and eastern Mainland Southeast Asia and much of the Malay Peninsula in Week 1 (17 – 23 March). Warmer conditions are predicted over parts of the eastern equatorial region in the next fortnight (17 – 30 March).

A Madden-Julian Oscillation (MJO) signal was present over the Western Hemisphere and Africa (Phase 1) during the first week of March, based on the RMM Index. Most models predict the signal to weaken and become indiscernible around the start of the forecast period. Some models predict an MJO signal to emerge and then strengthen over the Western Pacific (Phases 6 and 7) 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.

Wetter conditions are predicted over much of the Maritime Continent (except for the southern and southeastern parts) and southeastern Mainland Southeast Asia in the next fortnight (3 – 16 March).

No significant regional temperature anomalies are predicted in the next fortnight (3 – 16 March).

A weak Madden-Julian Oscillation (MJO) signal was present over the Western Hemisphere and Africa (Phases 8 and 1) towards the end of February, based on the RMM Index. Most models do not indicate coherent MJO activity during the forecast period. However, some models predict an MJO signal to briefly propagate over the Indian Ocean (Phases 2 and 3) before decaying in Week 1 (3 – 9 March).

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 Maritime Continent in the next fortnight (17 February – 2 March).

No significant regional temperature anomalies are predicted in the next fortnight (17 February – 2 March).

A Madden-Julian Oscillation (MJO) signal was present over the Western Pacific (Phases 6 and 7) in the second week of February. Models predict this MJO signal to propagate eastwards, reaching the Western Hemisphere and Africa (Phase 8) by the start of the forecast period. Most models predict the MJO to remain in Phase 8 throughout Week 1 (17 – 23 February), with some models indicating a weakening of the signal in Week 2 (24 February – 2 March).

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 the northeastern Maritime Continent in Week 1 (3 – 9 February).

Drier conditions are predicted over parts of the equatorial region in the next fortnight (3 – 16 February).

For temperature, cooler than normal conditions are predicted over central and eastern Mainland Southeast Asia in Week 1 (3 – 9 February). Warmer than normal temperature is predicted over the southeastern Maritime Continent in the next fortnight (3 – 16 February).

Towards the end of January, an MJO signal was present over the Maritime Continent (Phase 4), based on the RMM index. Models are split between the signal becoming inactive around the start of the forecast period and the signal continuing to propagate eastwards reaching the Western Pacific (Phases 6 and 7) during Week 1.

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 Maritime Continent in Week 1 (20 – 26 January).

Drier conditions are predicted over parts of southern and eastern Mainland Southeast Asia in Week 1 (20 – 26 January).

No significant regional temperature anomalies are predicted in the next fortnight (20 January – 2 February).

A Madden-Julian Oscillation (MJO) signal was present over the Western Hemisphere and Africa (Phases 8 and 1) in the second week of January based on the RMM index. Models predict this MJO signal to continue propagating eastwards over the Indian Ocean (Phase 3) during Week 1. In Week 2, most models predict the signal to weaken as it moves through the Maritime Continent (Phases 4 and 5).

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.