- Monsoon Update
(Updated on 6 December 2017)
Singapore and the surrounding region are currently in the Northeast Monsoon season. The Northeast Monsoon season onset in the second half of November 2017 and is forecast to extend into March 2018. The prevailing low level winds during the season typically blow from the northeast.
The Northeast Monsoon season comprise a wet phase usually from from late November to January, followed by a dry phase from February to early March. The wet phase is characterised by short-duration moderate to heavy thundery showers in the afternoon and evening, and about two to four episodes of monsoon surges. A monsoon surge refers to the strengthening of northeasterly winds blowing from a strong high-pressure system over the northern Asian continent towards the South China Sea. The surge normally brings periods of prolonged widespread rain and windy conditions to the surrounding region including Singapore and Peninsular Malaysia.
On most days in December 2017, Singapore can expect short-duration moderate to heavy thundery showers in the afternoon and on some of these days, the showers could extend into the evening. In addition, a few monsoon surges can be expected in the region this month. The effects of the surge on Singapore would depend on the strength and areal extent of the surge in the South China Sea. In the second week of December 2017, a surge is expected to affect the South China Sea and surrounding region. The surge could bring cooler temperatures, occasional windy conditions with periods of showers, heavy at times to Singapore, and last for a few days.
Based on long-term statistics* at our climate station, December is normally the wettest month of the year. The average rainfall for December is 318.6mm, and the average number of days with 0.2mm or more of rainfall is 18 days. The mean daily minimum and maximum temperature for December is 24.0 degrees Celsius and 30.2 degrees Celsius respectively.
For the latest weather forecast, including heavy rain warnings, please visit our MSS website (www.weather.gov.sg), NEA website (www.nea.gov.sg), download the myENV app., Weather@SG app, weather information hotline at 65427788, through following NEA’s twitter via @NEAsg or from radio broadcasts.
*based on 30-yr climatological reference period (1981- 2010)