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9-day Weather Forecast

Bulletin updated at 23:20 HKT 21/Sep/2025

9-Day Weather Forecast

General Situation:
Tropical Cyclone Ragasa will move across the vicinity of
Luzon Strait and enter the northern part of the South China
Sea in the next couple of days. 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 begin to deteriorate
rapidly with winds strengthening significantly later on
Tuesday. There will be heavy squally showers, thunderstorms
and significant storm surge on Wednesday. Seas will be very
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 22/9 (Monday)
Wind: East force 4, occasionally force 5 offshore and on
high ground, becoming north.
Weather: Becoming fine. Very hot during the day. There will
be swells.
Temp Range: 26 - 34 C
R.H. Range: 55 - 95 Per Cent
PSR: Low

Date/Month 23/9(Tuesday)
Wind: North force 5 to 6, force 7 to 8 later, up to force 9
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 - 33 C
R.H. Range: 55 - 95 Per Cent
PSR: Medium High

Date/Month 24/9(Wednesday)
Wind: East to northeast force 9 to 10. It may reach force 12
offshore and on high ground. Becoming southeast. Force 7 to
8 later.
Weather: Cloudy to overcast with heavy squally showers and
thunderstorms. Seas will be very 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 4, occasionally force 5.
Weather: Mainly cloudy with occasional showers and a few
squally 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 one or two showers. Sunny
periods 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.
Temp Range: 27 - 31 C
R.H. Range: 65 - 90 Per Cent
PSR: Medium Low

Date/Month 29/9(Monday)
Wind: East to southeast force 4, occasionally force 5.
Weather: Mainly cloudy with a few showers and thunderstorms.
Temp Range: 27 - 31 C
R.H. Range: 70 - 95 Per Cent
PSR: Medium

Date/Month 30/9(Tuesday)
Wind: East to southeast force 4.
Weather: Mainly cloudy with a few showers.
Temp Range: 27 - 31 C
R.H. Range: 70 - 95 Per Cent
PSR: Medium Low

Sea surface temperature at 2 p.m.21/9/2025 at North Point
was 27 degrees C.

Soil temperatures at 7 a.m.21/9/2025 at the Hong Kong
Observatory:
0.5 M below surface was 29.1 degrees C.
1.0 M below surface was 30.2 degrees C.

Weather Cartoons for 9-day weather forecast
Day 1 cartoon no. 90 - Hot
Day 2 cartoon no. 54 - Sunny Intervals with Showers
Day 3 cartoon no. 64 - Heavy Rain
Day 4 cartoon no. 64 - Heavy Rain
Day 5 cartoon no. 63 - Rain
Day 6 cartoon no. 53 - Sunny Periods with A Few Showers
Day 7 cartoon no. 62 - Light Rain
Day 8 cartoon no. 62 - Light Rain
Day 9 cartoon no. 62 - Light Rain

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