Northeast Monsoon (wet phase)

December weather in Singapore

The wettest month. Monsoon surges can dump extreme rainfall. 19 December 2006 still holds the 512 mm 24-hour record.

November January

Mean temperature

26.8°C

24.3 to 30.5°C

Rainfall

331.9 mm

19 rain days

Humidity / wind

85.5%

1.9 m/s mean wind

Thunder / lightning

14 / 16

days in a typical month

Compared with the year

  • Rain vs annual monthly share16%
  • Hottest month of the yearMay (28.6°C)
  • Wettest month of the yearDecember (331.9 mm)
  • Driest month of the yearFebruary (105.1 mm)

Normals from Changi Climate Station, 1991-2020.

What to check this month

480 km radar Flood alerts 24-hour forecast
Grey monsoon rain over tropical public housing
Northeast monsoon rain is often widespread and persistent, not a 20-minute burst.

What December actually feels like

  • Wettest month. Monsoon surges can dump extreme rain. 19 December 2006 still holds the 512 mm record.
  • Widespread moderate rain can last much of the day. That is different from a 30-minute thunderstorm.
  • Coolest nights of the year sit in this window. Flood alerts matter more than heat.

Monthly rainfall at Changi

1991-2020 normals. December is more than three times as wet as February.

Values in millimetres. Source: Meteorological Service Singapore.

All months

January February March April May June July August September October November December