While the north-east monsoon is set to continue into the second-half of January, there will be fewer rainy days ahead.
This could mean five to seven days of short thundery showers in the afternoon, which may extend into the evening on a few days, said the Meteorological Service Singapore (MSS) yesterday.
In addition, the passage of Sumatra squalls is expected to bring widespread thundery showers, coupled with occasional gusty winds, between pre-dawn and the early morning on one or two days.
For the rest of the month, the low-level winds over Singapore and the surrounding region are forecast to blow mostly from the north-east or north-west, the MSS said.
The rainfall for the entire month is expected to be well above normal, and daily temperatures will range between 24 deg C and 32 deg C.
There will be cooler weather on some rainy days, with the daily maximum temperature set to range between 27 deg C and 29 deg C, and the daily minimum temperature between 23 deg C and 24 deg C.
Reviewing the weather in the first-half of January, the MSS noted that rain fell over the island almost every day.
There was a monsoon surge in the South China Sea and the surrounding region over three days, from Dec 30, 2017 to Jan 1, it said.
As the surge weakened, the weather became cloudy and occasionally windy, with periods of light to moderate rain. Daily temperatures ranged from 22.7 deg C to 27.3 deg C in that period.
However, several days in the first week of the year saw moderate to heavy thundery showers fall in the afternoon and evening.
This was due to the strong solar heating of land areas with the convergence of winds, the MSS said.
On Jan 8, a temporary change in the winds so they blew from the south-west led to the passage of a Sumatra squall in the pre-dawn hours and morning.
The squall brought widespread thundery showers over the island, with the Paya Lebar area recording 131.8mm of rain in a day - the highest total daily rainfall for the first fortnight of January.
From Jan 10 to 14, a second monsoon surge in the South China Sea and the region brought overcast skies, windy conditions and widespread rain for five days.
Over this period, the daily maximum temperature was between 24.3 deg C and 28.5 deg C, while the daily minimum temperature dipped to a low of between 21.2 deg C and 22.4 deg C.
In the first fortnight of 2018, the daily maximum temperature ranged between 24.3 deg C and 33.2 deg C, while the daily minimum temperature ranged between 21.2 deg C and 23.7 deg C.
Meanwhile, rainfall levels were significantly above normal in the first-half of January, said the MSS.
The highest rainfall of 339.4mm was recorded in Paya Lebar, which the MSS said was 206 per cent above average.
The lowest was in the Bukit Panjang area, which recorded a rainfall of 162.5mm - or 44 per cent above average.