Weather in Colombo in July

Shoulder season. July is shoulder season in Colombo — cheaper, quieter, and a genuine gamble. You should expect rain on 20 days of the month, which is more days wet than dry.

July ranks 3 of 12 in Colombo. Only January scores clearly higher, and the difference is small enough to be settled by price rather than weather.

Rain on 20 of the month's 31 days, 2 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 87% nothing dries, including you.

What the averages hide

Averages flatten a month, and this one hides a few things: the day barely swings — 3.1 °C between the overnight low and the afternoon high. Across the twenty years measured, the hottest July day reached 31 °C and the coldest night fell to 23.9 °C, and the wettest single day dropped 35 mm — roughly 35% of the month's rain in one day.

July is statistically steady but not small: the year-to-year variation is modest in relative terms, yet the wettest July on record still delivered 183 mm against 33 mm in the driest. In a month this wet, even a tame spread is a lot of rain in absolute terms — the 99 mm average is a reasonable planning figure, not a promise.

Wind is light at 15.3 km/h, so the temperature on the page is close to the temperature on your skin, and humidity at 87% is the real story though — it is the number that decides how the day feels, not the 28.6 °C.

How July sits in the year

Temperatures hold steady either side: 29 °C in June, 28.6 here, 28.8 in August. Nothing about the timing within the month matters much.

Daylight in July

Colombo sits close enough to the equator that daylight barely moves all year — 12.5 hours in July, 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 27.3 °C in July — 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

Shoulder. The value months — prices ease off and you get the place closer to itself. July is the value pick for Colombo: it scores within 13 points of January without carrying January's prices.

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

July in Colombo versus nearby

If Colombo is one option among several, the nearby comparison is worth making. Kandy is a better bet in July — within a degree on temperature, 7 days less rain. Trincomalee is a better bet in July — 3.7 °C warmer, 13 days less rain.

So: July works, with January the better month by 13 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 July.