Hong Kong is bracing for potentially record-breaking heat as temperatures are forecast to reach 37°C in some areas on Wednesday, October 21st, with the Hong Kong Observatory (HKO) issuing a hot weather warning.
Record-Breaking Temperatures and Local Variations
The HKO predicts a high of 33°C for the city overall, but conditions will be significantly hotter in the New Territories. This would not only break the existing record for the latest hot weather of the year but also mark a particularly intense heatwave for this time of year.
The Role of El Niño and Regional Weather Patterns
The unusually warm conditions are also linked to the ongoing super El Niño event. This is compounded by the sinking air associated with Typhoon “Melor”. The latest ocean observation data shows that the key monitoring area’s temperature continues to rise, and the super El Niño has formed in September 2026.
Health Advice and Precautions
Recommendations include staying hydrated, avoiding prolonged outdoor activity, and ensuring adequate ventilation in indoor spaces. The article also advises on the importance of opening windows and using fans to promote airflow if air conditioning is not available.
Looking Ahead: Continued Warmth and Uncertainty
While the current heatwave is expected to persist through the week, the long-term forecast remains uncertain. The HKO notes that the impact of Typhoon “Melor” may bring somewhat clearer skies during the weekend, but temperatures are likely to remain high.
On October 21, 2026, the HKO issued a hot weather warning at 6:45 am, marking the latest hot weather warning of the year. The Observatory predicts that the highest temperature will reach 33°C or above, breaking the record for the latest hot weather day of the year. The heatwave is expected to continue, with some areas reaching extreme heat levels.
The HKO and other meteorological institutions, including Google’s weather AI, predict that Typhoon “Melor” will move northwestward, crossing the Philippine Sea and potentially impacting the southeastern coast of China or turning northward to sustain towards the East China Sea. The typhoon’s outer sinking air will bring high temperatures and dry weather to Hong Kong and southern China.
The HKO has also issued a heatstroke warning, advising residents to take precautions against heat-related illnesses. The public is advised to stay hydrated, avoid prolonged outdoor activities, and take regular breaks in shaded areas. The HKO will continue to monitor the weather situation and provide updates on the typhoon’s forecast and potential impacts.