Persistent Afternoon Thundery Showers and High Temperatures Forecast for Singapore Throughout Late April

MSS predicts frequent afternoon thundery showers and temperatures up to 35 deg C for late April. Stay updated on Sumatra squalls and inter-monsoon conditions.

By: AXL Media

Published: Apr 16, 2026, 11:34 AM EDT

Source: Information for this report was sourced from The Straits Times

Inter-Monsoon Patterns Drive Afternoon Rainfall

Singapore is entering the second half of April with a forecast defined by frequent atmospheric instability and daytime heating. According to the Meteorological Service Singapore (MSS), residents should expect short, thundery showers over various parts of the island on most afternoons throughout the fortnight. These localized weather events, a hallmark of the ongoing inter-monsoon period, are occasionally expected to persist into the evening hours as convection patterns shift across the region.

The Influence of Sumatra Squalls

Beyond the standard afternoon rain, the local climate may be influenced by the passage of Sumatra squalls. These fast-moving, vigorous lines of thunderstorms typically develop over the Malacca Strait due to converging land breezes and warm water convection. The MSS advisory indicates that these squalls could trigger widespread thundery showers and gusty winds during the pre-dawn or early morning hours on at least one or two days, potentially disrupting early commutes and outdoor activities before the sun reaches its peak.

Elevated Temperatures and Lightning Risks

The transition between monsoons is characterized by light, variable winds that offer little relief from the tropical heat. Daily maximum temperatures are projected to hover between 33 deg C and 34 deg C on most days, with the mercury likely hitting 35 deg C during certain windows. This period is also notorious for higher lightning activity, a standard feature of inter-monsoon weather that the MSS predicts will last until May. The lack of steady prevailing winds from the southeast or southwest further contributes to the buildup of heat throughout the day.