Thundery showers, more lightning expected in the first half of April: Met Service Toggle share menu Advertisement File photo of rainy weather in Singapore. 01 Apr 2021 08:44PM) Share this content Bookmark SINGAPORE: With the onset of inter-monsoon conditions this month, thundery showers can be expected in the afternoon and early evening, said the Singapore Meteorological Service in its fortnightly outlook on Thursday (Apr 1). “During the inter-monsoon months, the incidence of lightning activity is higher than other times of the year," it added. Advertisement Advertisement In the first two weeks of April, short-duration moderate to heavy thundery showers with frequent lightning are expected over parts of Singapore on most afternoons.