Inter-monsoon / start of SW Monsoon

May weather in Singapore

The hottest month on the 24-hour mean. Afternoon thunderstorms remain common as southwest flow sets in.

April June

Mean temperature

28.6°C

25.7 to 32.3°C

Rainfall

164.3 mm

15 rain days

Humidity / wind

82.3%

1.7 m/s mean wind

Thunder / lightning

19 / 21

days in a typical month

Compared with the year

  • Rain vs annual monthly share8%
  • 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

2-hour nowcast Lightning Heat stress
Afternoon thunderstorm cloud over a tropical city
Inter-monsoon storms grow in place on hot, still afternoons.

What May actually feels like

  • Hottest month on the 24-hour mean. Hydration and shade beat a temperature number.
  • Afternoon storms remain common as southwest flow starts to set in.
  • Check WBGT before long outdoor sport, especially after 11am.

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