Weather in Colombo in January

A good month. January is a solid month to be in Colombo. Highs average 29.8 °C, lows 23.1 °C, and rain falls on 12 days — nothing in the month is working against you.

January is the highest-scoring month of the twelve. The nearest rival is February, and the month at the other end of the year is March.

Rain on 12 days, 2 of them heavy. Enough to need a plan B, not enough to need a plan around it. Pack for 29.8 °C days and 23.1 °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: 12 days top 30 °C — hot spells arrive, but they break. Across the twenty years measured, the hottest January day reached 34.3 °C and the coldest night fell to 18.9 °C, and the wettest single day dropped 32 mm — roughly 43% of the month's rain in one day.

January is moderately variable: 25 mm in the driest year against 207 mm in the wettest, around an average of 75 mm. Roughly two Januarys in three land near that average, and the third does something else entirely.

Wind is light at 12.4 km/h, so the temperature on the page is close to the temperature on your skin, and humidity runs at 80%, high enough to notice on the warm days without dominating them.

How January sits in the year

Temperatures hold steady either side: 29.2 °C in December, 29.8 here, 30.9 in February. Nothing about the timing within the month matters much. Rain has already shifted: 9 days fewer than December had.

Daylight in January

Colombo sits close enough to the equator that daylight barely moves all year — 11.8 hours in January, 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 27.7 °C in January — warm enough that the water offers no relief from the heat. The sea peaks at 29.9 °C in April and bottoms out at 27.2 °C — water lags the air by a month or two, which is why the best swimming often comes after the best weather.

How busy it gets

Peak season. Expect the highest prices of the year and to be booking well ahead. If the dates are flexible, July is the trade worth considering — 13 points weaker on weather, and materially quieter.

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

January 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 — 3.5 °C cooler, the same number of rain days. Trincomalee is a better bet in January — 2.3 °C cooler, 1 day less rain.

So: January is the answer for Colombo. If it is booked out or priced out, February is the next best thing at 1 points behind, and March is the month to keep off the shortlist.

Every month in Colombo

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