Weather in Colombo in April

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

April ranks 10 of 12 — near the bottom of Colombo's year. January is the month that works, and the swing between the two is 19 points, which is a different holiday rather than a slightly better one.

Rain on 26 of the month's 30 days, 8 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. Pack for 30.9 °C days and 26.4 °C nights; the spread matters more here than any single number.

What the averages hide

Averages flatten a month, and this one hides a few things: 22 days top 30 °C, making the heat continuous rather than occasional; the day barely swings — 4.5 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest April day reached 34.8 °C and the coldest night fell to 24.4 °C, and the wettest single day dropped 84 mm — roughly 37% of the month's rain in one day.

April is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest April on record still delivered 393 mm against 66 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 226 mm average is a reasonable planning figure, not a promise.

Wind is light at 8.2 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 81%, high enough to notice on the warm days without dominating them.

How April sits in the year

Temperatures hold steady either side: 31.7 °C in March, 30.9 here, 29.8 in May. Nothing about the timing within the month matters much. Rain has already shifted: 9 days more than March had.

Daylight in April

Colombo sits close enough to the equator that daylight barely moves all year — 12.3 hours in April, against a range of just 0.8 hours across the whole calendar. Sunrise and sunset land at roughly the same time whenever you come.

Sea temperature

The sea sits at about 29.9 °C in April — 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.

April in Colombo versus nearby

If Colombo is one option among several, the nearby comparison is worth making. Kandy is close enough to be a coin toss — within a degree on temperature, 5 days less rain. Trincomalee is close enough to be a coin toss — within a degree on temperature, 8 days less rain.

So: April works, with January the better month by 18 points if the dates can move. If they cannot, nothing here should stop you booking.

Every month in Colombo

See all twelve months in Colombo, or where else to go in April.