Bulletin updated at 00:00 HKT 21/Sep/2025
9-Day Weather Forecast General Situation: Under the influence of the remnant of Mitag, there will still be showers and squally thunderstorms over Guangdong today. Tropical Cyclone Ragasa will move towards the vicinity of Luzon Strait and intensify significantly today and tomorrow, and enter the northern part of the South China Sea early this week. Under the influence of its outer subsiding air, the weather will be very hot over the coast of Guangdong on Monday to early Tuesday. Ragasa is expected to edge closer to the coast of Guangdong gradually on Tuesday. Under the influence of its broad circulation, the weather over the region will deteriorate with winds strengthening significantly midweek this week. There will be heavy squally showers, thunderstorms and significant storm surge. Seas will be high with swells. With the departure of Ragasa, showers will ease off gradually in the latter part of this week. Besides, a broad trough of low pressure will bring unsettled weather to the central and northern parts of the South China Sea to the eastern part of the Philippines in the latter part of this week. Date/Month 21/9 (Sunday) Wind: East to southeast force 3 to 4, occasionally force 5 offshore later. Weather: Mainly cloudy with occasional showers and squally thunderstorms. Showers will be heavy at times in the morning. Temp Range: 25 - 30 C R.H. Range: 70 - 95 Per Cent PSR: High Date/Month 22/9(Monday) Wind: East force 4, becoming north. Weather: Cloudy periods at first. Becoming fine and very hot during the day. Temp Range: 27 - 34 C R.H. Range: 55 - 90 Per Cent PSR: Low Date/Month 23/9(Tuesday) Wind: North force 4 to 5, force 6 to 7 later, up to force 8 offshore and on high ground. Weather: Becoming cloudy. Very hot with sunny intervals in the morning. Squally showers and thunderstorms later. Seas will be very rough with swells. Temp Range: 27 - 34 C R.H. Range: 55 - 95 Per Cent PSR: Medium High Date/Month 24/9(Wednesday) Wind: East to northeast force 8 to 9, up to force 11 offshore and on high ground. Becoming southeast later. Weather: Cloudy to overcast with heavy squally showers and thunderstorms. Seas will be high with swells. Temp Range: 25 - 28 C R.H. Range: 80 - 95 Per Cent PSR: High Date/Month 25/9(Thursday) Wind: East to southeast force 5 to 6, force 7 offshore and on high ground at first. Weather: Cloudy with squally showers and thunderstorms. Showers will be heavy at first. Seas will be very rough with swells. Temp Range: 25 - 29 C R.H. Range: 80 - 95 Per Cent PSR: High Date/Month 26/9(Friday) Wind: East force 3 to 4. Weather: Mainly cloudy with occasional showers and a few thunderstorms. Temp Range: 26 - 30 C R.H. Range: 75 - 95 Per Cent PSR: Medium High Date/Month 27/9(Saturday) Wind: East to northeast force 4, occasionally force 5. Weather: Mainly cloudy with a few showers. Sunny intervals during the day. Temp Range: 27 - 32 C R.H. Range: 65 - 90 Per Cent PSR: Medium Low Date/Month 28/9(Sunday) Wind: East force 4 to 5. Weather: Mainly cloudy with a few showers. Sunny intervals during the day. Temp Range: 27 - 32 C R.H. Range: 65 - 90 Per Cent PSR: Medium Low Date/Month 29/9(Monday) Wind: East to southeast force 4. Weather: Mainly cloudy with a few showers and thunderstorms. Temp Range: 27 - 31 C R.H. Range: 70 - 95 Per Cent PSR: Medium Sea surface temperature at 2 p.m.20/9/2025 at North Point was 28 degrees C. Soil temperatures at 7 a.m.20/9/2025 at the Hong Kong Observatory: 0.5 M below surface was 30.1 degrees C. 1.0 M below surface was 30.4 degrees C. Weather Cartoons for 9-day weather forecast Day 1 cartoon no. 63 - Rain Day 2 cartoon no. 90 - Hot Day 3 cartoon no. 54 - Sunny Intervals with Showers Day 4 cartoon no. 64 - Heavy Rain Day 5 cartoon no. 64 - Heavy Rain Day 6 cartoon no. 63 - Rain Day 7 cartoon no. 54 - Sunny Intervals with Showers Day 8 cartoon no. 54 - Sunny Intervals with Showers Day 9 cartoon no. 62 - Light Rain
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