Subseasonal Weather Outlook and Review

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 the next fortnight (29 September – 12 October).

No significant Madden-Julian Oscillation (MJO) signal was present in the third week of September. Most models predict no significant MJO activity during the forecast period. Subseasonal Weather Outlook (15 – 28 September 2025)

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 central and southern Maritime Continent in the next fortnight (29 September – 12 October).

No significant regional temperature anomalies are predicted in the next fortnight (29 September – 12 October).

No significant Madden-Julian Oscillation (MJO) signal was present in the third week of September. Most models predict no significant MJO activity during the forecast period. Subseasonal Weather Outlook (15 – 28 September 2025)

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.