Subseasonal Weather Outlook (1 May – 15 May 2019)

Issued 1 May 2019
Valid for weeks 1 and 2: 1 May – 15 May


Figure 1: Rainfall Outlook

Figure 2: Temperature Outlook

May lies within the inter-monsoon period where prevailing winds over the Southeast Asia region are typically light and variable in direction. During this period, the monsoon rain band lies over the equatorial region and usually brings rainy weather over most parts of the Southeast Asia region.

In the coming fortnight, drier-than-usual conditions are expected to persist over parts of the Mekong sub-region, particularly over Myanmar. Meanwhile, wetter-than-usual conditions are forecast over the southwestern Maritime Continent, including the Java region. This is associated with the passage of Madden-Julian Oscillation (MJO) through the western Maritime Continent in Week 1. In the eastern Maritime Continent, drier-than-usual conditions are forecast to develop north of the equator in Week 1, spreading to the south of the equator in Week 2.

Warm conditions are expected to persist over most of the northern ASEAN region, as well as Peninsular Malaysia and Singapore.

The outlook is assessed for the region in general. For specific updates on the national scale, the relevant ASEAN National Meteorological and Hydrological Services should be consulted.