HONG KONG — A dramatic and swift drop in temperatures is imminent across the Guangdong coast, with a powerful cold front expected to arrive late Monday, ushering in a significant weather shift that will erase days of unseasonably warm weather. The Hong Kong Observatory (HKO) warned that regions, including Hong Kong, will experience a sharp decline in mercury starting Tuesday, driven by a strong northeast monsoon, with inland areas potentially facing genuinely cold conditions.
The rapid cooling marks a significant transition from the current mild climate. Sunday and much of Monday are forecast to remain warm, with daytime highs reaching up to 27 degrees Celsius (81 F). However, the arrival of the cold front late Monday, October 17, into the early hours of Tuesday will trigger the dramatic change.
Temperature Plummets by Over 10 Degrees
The most noticeable impact will be felt on Tuesday when the region collectively shivers. HKO projections indicate Tuesday’s high will barely reach 16 degrees Celsius, translating to a stunning 11-degree drop from Monday’s peak. The contrast will be even more severe in parts of the New Territories, where areas like Sheung Shui may see temperatures crash by as much as 15 degrees in 24 hours, falling from Monday’s peak of 29 degrees to a Tuesday low of just 14 degrees.
By Wednesday, October 19, the core chill will settle in, with minimum daytime temperatures predicted to bottom out at 13 degrees Celsius (55 F). The cold weather is expected to persist through Thursday, with lows hovering around 14 degrees.
The frigid air mass will also bring notable winds. Officials anticipate strong winds accompanying the front’s arrival Monday night, with gusts reaching Level 6 offshore and in elevated areas. On Tuesday, wind strength in high-altitude zones could peak at Level 7, compounding the perception of cold.
Impact and Outlook
For residents accustomed to the lingering warmth, this intense shift requires immediate preparedness. The dry northeast monsoon currently influencing the region, which has provided clear, warm days recently, will continue to ensure sunny conditions but with the addition of stark, persistent cold.
A notable feature of the immediate aftermath of the front is the minimal temperature variation. On Tuesday, the difference between the high (16°C) and the low (13°C) is just three degrees, indicating sustained cold throughout the day.
While the region braces for the deep chill, relief is on the horizon toward the end of the week. HKO forecasts suggest the monsoon will begin to ease slightly in the latter half of the week, allowing temperatures along the South China coast tentatively to climb. By Friday, October 21, the maximum temperature is expected to surpass 20 degrees Celsius, starting a gradual return to milder conditions.
By the following week, the highs are projected to approach late-autumn norms, with Sunday’s forecast showing temperatures between 18 and 24 degrees, and Monday, October 24, potentially seeing highs of 25 degrees.
Key Weather Transition Timeline:
- Monday (Oct. 17): Warm day (27°C high); cold front arrives late evening.
- Tuesday (Oct. 18): Sharp drop; highs 16°C, lows 15°C; strong winds.
- Wednesday (Oct. 19): Peak cold; low 13°C (55 F).
- Friday (Oct. 21): Gradual warming begins; high 21°C.
Authorities advise residents, particularly the elderly and those with chronic health conditions, to take precautions against the sudden drop in temperature and increased wind chill.