Tonga
Season running low
In 2026 so far, the reported cases are well below the expected number of cases. Cases are currently increasing, as expected at this time of the year based on trends in previous years.
Data refreshed: 18 June 2026
Dengue cases in 2026
Some recent months include estimated values because official reports can arrive with delays.
Current year: Reported cases
Current year: Estimated cases (reported cases not available)
Uncertainty: 95% prediction interval (validation-calibrated)
Further analysis
In May 2026, Tonga reported 150 dengue cases, well above what we would typically expect for this time of year.
Compared with April 2026, in which 50 cases were reported, this is a similar level of reported cases.
So far in 2026, the country has recorded 200 cases-about 0.4x the expected level-so the season is below average to date.
The last month with reported cases is April 2026.
In Tonga the average peak month is March.