Subseasonal Weather Outlook (12 – 25 July 2021)

Issued 9 July 2021
First forecast week: 12 July – 18 July
Second forecast week: 19 July – 25 July


Figure 1: Rainfall Outlook


Figure 2: Temperature Outlook


Wetter conditions are expected in Week 1 (12 – 18 July) over much of the central and eastern Maritime Continent, as well as the southeastern part of Mainland Southeast Asia. In Week 2 (19 – 25 July), these wetter conditions are expected to ease, apart from over the southeastern part of the Maritime Continent.

Drier conditions are expected in the next fortnight (12 – 25 July) over parts of the western Maritime Continent. These drier conditions may extend eastwards in Week 2 (19 – 25 July) to cover western parts of Borneo.

Warmer temperatures than usual are expected over the southern part of the Maritime Continent in Week 1 (12 – 18 July). These warmer conditions are expected to extend to most of the Maritime Continent and southern parts of Mainland Southeast Asia in Week 2 (19 – 25 July).

An MJO signal was present over the Indian Ocean (Phases 2 and 3) at the beginning of July. Some models predict the MJO to continue propagating eastwards over 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.