Weather in Singapore in May

A hard month. May is a hard month in Singapore, and worth planning around. You should expect rain on 26 days of the month, which is more days wet than dry.

Singapore barely has seasons. May scores 47 out of 100 against a best of 61 in February — a gap small enough that the month you choose matters far less here than the week you choose.

Rain on 26 of the month's 31 days, 6 of them heavy. At that frequency a wet-weather backup is not a contingency, it is the itinerary — book the indoor things first and treat the clear days as the bonus. Natural fibres and a second shirt for the day. At 83% nothing dries, including you.

What the averages hide

Averages flatten a month, and this one hides a few things: 19 days top 30 °C — hot spells arrive, but they break; the day barely swings — 4 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest May day reached 33.9 °C and the coldest night fell to 24.8 °C, and the wettest single day dropped 53 mm — roughly 27% of the month's rain in one day.

May is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest May on record still delivered 328 mm against 90 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 199 mm average is a reasonable planning figure, not a promise.

Wind is light at 5.7 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 83%, high enough to notice on the warm days without dominating them.

How May sits in the year

Temperatures hold steady either side: 30.5 °C in April, 30.3 here, 29.7 in June. Nothing about the timing within the month matters much.

Daylight in May

Singapore sits close enough to the equator that daylight barely moves all year — 12.2 hours in May, against a range of just 0.2 hours across the whole calendar. Sunrise and sunset land at roughly the same time whenever you come.

Sea temperature

The sea sits at about 30.1 °C in May — warm enough that the water offers no relief from the heat. This is the warmest the water gets all year.

How busy it gets

Off season. The genuine off season: cheapest by a distance, with the caveat that some tours and restaurants close entirely.

Crowd levels are estimated from climate desirability and school-holiday calendars, not from visitor numbers.

May in Singapore versus nearby

If Singapore is one option among several, the nearby comparison is worth making. Pekanbaru is close enough to be a coin toss — within a degree on temperature, 4 days less rain. Kuantan is close enough to be a coin toss — within a degree on temperature, the same number of rain days.

So: May works, with February the better month by 14 points if the dates can move. If they cannot, nothing here should stop you booking.

Every month in Singapore

See all twelve months in Singapore, or where else to go in May.