Bulletin updated at 16:30 HKT 18/Sep/2025
9-Day Weather Forecast General Situation: Tropical Cyclone Mitag will edge closer to the coast of eastern Guangdong and intensify gradually today and tomorrow. Under the influence of the northeast monsoon, Mitag will then turn westwards, moving closer to the vicinity of the Pearl River Estuary. It will be windy with squally showers and thunderstorms over the region in the next couple of days. With Mitag departing, the weather will improve briefly and will be very hot early next week. The other tropical cyclone over the western North Pacific to the east of the Philippines is expected to intensify significantly in the next few days, and enter the northern part of the South China Sea early next week. It will then edge closer to the coast of southern China. Under the influence of its broad circulation, the weather over the region will deteriorate significantly with winds strengthening again midweek next week. There will be heavy squally showers, thunderstorms and storm surge. Seas will be very rough with swells. Date/Month 19/9 (Friday) Wind: North to northwest force 4 to 5, occasionally force 6 later, up to force 7 offshore and on high ground. Weather: Mainly cloudy with a few showers and thunderstorms. Sunny intervals in the morning. Showers will increase gradually with squalls. Temp Range: 27 - 32 C R.H. Range: 70 - 95 Per Cent PSR: High Date/Month 20/9(Saturday) Wind: West to southwest force 5, occasionally force 6 at first, up to force 7 offshore and on high ground. Weather: Mainly cloudy with occasional squally showers and thunderstorms. Showers will be heavy at times. Seas will be rough with swells. Temp Range: 26 - 31 C R.H. Range: 70 - 95 Per Cent PSR: High Date/Month 21/9(Sunday) Wind: South to southeast force 4 to 5. Weather: Mainly cloudy with occasional showers and squally thunderstorms. Showers will be heavier at times at first. There will be swells. Temp Range: 26 - 31 C R.H. Range: 70 - 95 Per Cent PSR: Medium High Date/Month 22/9(Monday) Wind: East to northeast force 3 to 4. Weather: Sunny periods and one or two showers. Very hot during the day. Temp Range: 27 - 34 C R.H. Range: 60 - 90 Per Cent PSR: Medium Low Date/Month 23/9(Tuesday) Wind: North force 4, force 5 later, occasionally force 6 offshore and on high ground. Weather: Sunny periods. Very hot during the day. Squally showers and thunderstorms later. There will be swells. Temp Range: 27 - 34 C R.H. Range: 60 - 95 Per Cent PSR: Medium Date/Month 24/9(Wednesday) Wind: North to northeast force 6 to 7, up to force 9 offshore and on high ground, becoming east to southeast later. Weather: Cloudy to overcast with heavy squally showers and thunderstorms. Seas will be very rough with swells. Temp Range: 26 - 30 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 heavier at first. Seas will be very rough with swells. Temp Range: 26 - 30 C R.H. Range: 80 - 95 Per Cent PSR: High Date/Month 26/9(Friday) Wind: East force 4 to 5. Weather: Mainly cloudy with occasional showers and a few thunderstorms. Temp Range: 26 - 31 C R.H. Range: 75 - 95 Per Cent PSR: Medium High Date/Month 27/9(Saturday) Wind: East 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: 70 - 95 Per Cent PSR: Medium Sea surface temperature at 2 p.m.18/9/2025 at North Point was 29 degrees C. Soil temperatures at 7 a.m.18/9/2025 at the Hong Kong Observatory: 0.5 M below surface was 30.6 degrees C. 1.0 M below surface was 30.4 degrees C. Weather Cartoons for 9-day weather forecast Day 1 cartoon no. 62 - Light Rain Day 2 cartoon no. 64 - Heavy Rain Day 3 cartoon no. 63 - Rain Day 4 cartoon no. 90 - Hot Day 5 cartoon no. 53 - Sunny Periods with A Few Showers Day 6 cartoon no. 64 - Heavy Rain Day 7 cartoon no. 63 - Rain Day 8 cartoon no. 63 - Rain Day 9 cartoon no. 54 - Sunny Intervals with Showers
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