Hong Kong · September
Low seasonHong Kong · Asia
Climate Overview
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Ø day, range from coolest to warmest dayØ dayrange | 20° (68°)12– (54–)25 (77) | 21° (70°)12– (54–)26 (79) | 23° (73°)16– (61–)28 (82) | 26° (79°)19– (66–)31 (88) | 30° (86°)24– (75–)33 (91) | 31° (88°)27– (81–)34 (93) | 33° (91°)28– (82–)35 (95) | 32° (90°)27– (81–)35 (95) | 32° (90°)27– (81–)35 (95) | 29° (84°)24– (75–)32 (90) | 26° (79°)20– (68–)30 (86) | 21° (70°)13– (55–)26 (79) |
Ø night, range from coldest to warmest nightØ nightrange | 14° (57°)7– (45–)19 (66) | 15° (59°)9– (48–)20 (68) | 18° (64°)11– (52–)22 (72) | 21° (70°)15– (59–)25 (77) | 25° (77°)20– (68–)28 (82) | 27° (81°)24– (75–)29 (84) | 27° (81°)24– (75–)29 (84) | 27° (81°)24– (75–)28 (82) | 26° (79°)23– (73–)28 (82) | 24° (75°)20– (68–)27 (81) | 20° (68°)14– (57–)24 (75) | 15° (59°)8– (46–)20 (68) |
☀️Sunshine | 5h UV 6 | 5h UV 6 | 5h UV 6 | 6h UV 7 | 6h UV 7 | 6h UV 7 | 7h UV 8 | 6h UV 7 | 7h UV 7 | 7h UV 7 | 6h UV 6 | 5h UV 5 |
🌊Water Temp | 19° (66°) | 19° (66°) | 21° (70°) | 24° (75°) | 28° (82°) | 30° (86°) | 30° (86°) | 30° (86°) | 29° (84°) | 27° (81°) | 24° (75°) | 20° (68°) |
🌧Rain Days | 2d22mm (0.9") | 2d32mm (1.3") | 4d46mm (1.8") | 8d111mm (4.4") | 12d267mm (10.5") | 16d393mm (15.5") | 14d276mm (10.9") | 15d330mm (13.0") | 11d223mm (8.8") | 4d97mm (3.8") | 3d43mm (1.7") | 2d21mm (0.8") |
Best travel time current monthØ = average · small figures = range: coolest–warmest day / coldest–warmest nightClimate data 2005–2025 · Source: ERA5 + station data
Still off-season — flights and hotels significantly cheaper than in October.
September in Hong Kong is generally manageable, but with 11 rain days it's not a reliably sunny month. Better conditions can be found in April, October, and November.
Daytime highs reach 32°C (90°F) with a daily average of 29°C (84°F) — nights stay warm at 26°C (79°F). Peaks reach around 35°C (95°F), the coldest nights around 23°C (73°F). The sun shines an average of 7 hours per day; there are 11 rain days with 223 mm (8.8 in) total. The water is a warm 29°C (84°F) — perfect for snorkelling and swimming.
Sun protection, a hat, and plenty of water are essential at these temperatures. Plan activities for early morning or evening.
Hot, muggy and rainy: highs sit at 31 to 32°C (88 to 90°F), the nights stay warm and humidity climbs to 75 to 80 per cent. Thunderstorms and downpours roll through, and the typhoon season reaches its peak. In return the beaches on Lantau and the Outlying Islands are bath-warm, and air-conditioned museums and malls are in demand. In September (sometimes early October, depending on the lunar calendar) lanterns glow in the parks for the Mid-Autumn Festival.
Events & Festivals
- Mid-Autumn Festivalvariable (September/October, 15th day of the 8th lunar month)
Lanterns light up parks and promenades, above all at the big lantern carnival in Victoria Park. In Tai Hang a 67-metre (220-foot) fire dragon studded with thousands of incense sticks is carried through the streets.
Packing list for Hong Kong in September
- Light summer clothes
- Swimwear and beach towel
- Sunscreen
- Sunglasses
- Light umbrella or rain poncho
- Insect repellent
- Travel first-aid kit
Frequently Asked Questions
- Is September a good time to visit Hong Kong?
- September is not an optimal month for Hong Kong (Score: 73/100), but it is manageable. For better conditions, consider April, October, and November.
- How warm is it in Hong Kong in September?
- In September, Hong Kong sees daily highs of 32°C (90°F). Nights cool to 26°C (79°F), with a daily average of 29°C (84°F). Peaks reach around 35°C (95°F), the coldest nights around 23°C (73°F).
- How much rain falls in Hong Kong in September?
- In September, Hong Kong receives an average of 223 mm (8.8 in) of rain over 11 rain days. An umbrella may occasionally be needed.
- How many sunshine hours does Hong Kong get in September?
- Hong Kong averages 7 sunshine hours per day in September — above the annual average.
- How warm is the water in Hong Kong in September?
- Water temperature in Hong Kong in September averages 29°C (84°F) — ideal for swimming and snorkelling.
