Singapore Experiencing Inter-Monsoon Conditions

Short-duration thundery showers mostly in the afternoon


Singapore, 2 November 2015 – In the next fortnight, Inter-Monsoon conditions are expected to prevail. Low level winds are forecast to be predominantly light and variable in direction.

2. For the first fortnight of November 2015, short-duration thundery showers are forecast mostly in the afternoon on 6 to 8 days. The showers may be heavy at times, especially when there is convergence of winds coupled with strong solar heating of land areas. In addition, dry and warm weather conditions can be expected on a few days. The maximum daily temperature is forecast to be between 33 and 34 degrees Celsius.

3. Based on long-term statistics, November is the second wettest month in the year, after December. The rainfall for the first fortnight of November 2015 is likely to be near normal.

Review of 1 – 31 October 2015

4. Southwest Monsoon conditions prevailed in the region in early October 2015 and transitioned to Inter-monsoon conditions in the last week of the month. Towards the end of October 2015, the low level winds gradually weakened and became light and variable in direction.

5. Most of the showers fell in the first and last week of October 2015, and rainfall was heaviest on 2 October 2015 where the highest daily rainfall recorded was 84mm in the western part of the island, around Tuas. On 28 October 2015, widespread thundery showers affected Singapore in the pre-dawn and morning due to convergence of winds in the surrounding vicinity. Dry and warm weather conditions prevailed mostly in the second and third week of the month, where the highest daily maximum temperature recorded ranged between 34.6 and 35.1 degrees Celsius. The lowest daily minimum temperature recorded this month was between 21.6 and 22.9 degrees Celsius, which occurred on days when it rained.

6. Singapore received below average rainfall in October 2015. The lowest rainfall of 52mm and 60mm (65 to 75% below average) was recorded over the eastern part of Singapore around Paya Lebar. Rainfall was highest over the western part of the island around Tuas where 151mm to 176mm (0 to 25% above average) of rain was recorded.

7. October 2015 marked the fifth consecutive month since June 2015 where the monthly total rainfall averaged across all rainfall stations island wide was significantly below the long-term monthly average. For the Changi climate station, except for August 2015, the monthly total rainfall has been below average since January 2015, ranging from 26% to 88% below the long-term monthly average.