SINGAPORE — Singaporeans can expect thundery showers in the coming week but conditions will turn dry in the second week of July, says the weatherman.

The prevailing south-west monsoon conditions are expected to persist over Singapore in the first two weeks of this month with low level winds blowing in from the southeast or southwest, said the Meteorological Service Singapore (MSS) on Monday (July 1).

Expect short, thundery showers in the late morning and early afternoon in the first week of July on three to five days, it said.

Sumatra squalls — a line of thunderstorms which develop over Sumatra or the Malacca Straits during the south-west monsoon — could also bring in widespread thundery showers and gusty winds for two or three days in the morning.

Overall rainfall for the first two weeks of July is likely to be “near-normal” across the island.

However, Singaporeans can expect dry and warm weather in the second week of July, with the monsoon rain band expected to shift further north.

The daily temperature for the next two weeks is expected to range from 25°C to 34°C. Prevailing winds from the southeast bringing in warm and humid air from the sea are likely to result in minimum night-time temperatures of around 28°C.

JUNE COOLER THAN MAY

June was “relatively wet”, with thundery showers falling over the island mostly between the late morning and afternoon on more than three-quarters of the days in the month, the MSS said.

It attributed June’s wet weather to the presence of the monsoon rain band over the equatorial region, the large-scale wind convergence over the surrounding region and the passage of a major fluctuation in tropical weather, known as the Madden-Julian Oscillation, which recurs every 30 to 60 days.

The highest daily total rainfall recorded last month was on June 21, recorded at Changi, with 137.7mm of localised moderate to heavy thundery showers falling over the eastern part of Singapore.

The MSS said that June had been cooler than May, with a mean daily maximum temperature of 31.3°C. The daily maximum temperature in June ranged from 28.2°C to 33.9°C, with the highest, 33.9°C, recorded on June 11 at Choa Chu Kang and Pulau Ubin, and again on June 20 at Paya Lebar.

However, there were a few warm nights in June with the minimum night-time temperature standing at around 28°C as a result of prevailing winds blowing from the southeast that brought in warm and humid air from the sea.

The first two weeks of June had also seen “well above-average rainfall” across the island.