In 2026 so far, the reported cases are well above the expected number of cases. Cases are currently decreasing, as expected at this time of the year based on trends in previous years.
Data refreshed: 18 October 2026Some recent months include estimated values because official reports can arrive with delays.
In September 2026, Sri Lanka reported 2,996 dengue cases, close to what we would typically expect for this time of year.
Compared with August 2026, in which 10,155 cases were reported, this is a similar level of reported cases.
So far in 2026, the country has recorded 98,541 cases-about 2.1x the expected level-so the season is above average to date.
The last month with reported cases is August 2026.
In Sri Lanka the average peak month is July.
