The declaration states that Covid-19 continues to spread globally and countries close to the kingdom.
It adds Covid-19 remains a threat to Tonga.
Tonga’s neighbours New Zealand, Fiji and the states of Victoria and New South Wales in Australia have Covid-19 cases.
Earlier this month, the main island of Tongatapu went into one-week lockdown after a Covid-positive traveller, who is fully vaccinated and was showing no symptoms, arrived in Tonga on a flight from Christchurch, New Zealand.