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Contents
- The climate of Sai Wan
- The best time to visit Sai Wan
- The worst time to visit Sai Wan
- Spring weather in Sai Wan
- Summer weather in Sai Wan
- Autumn weather in Sai Wan
- Winter weather in Sai Wan
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
Climate and monthly weather forecast
The climate of Sai Wan
Sai Wan, Hong Kong finds itself in the Humid subtropical zone according to the Köppen climate classification - represented by the symbol Cwa. This particular zone is characterized by mild, wet winters and warm to hot summers with high humidity. In Sai Wan, temperatures exhibit a pronounced cycle, fluctuating from a mild 15°C (59°F) in February to a sultry 30.5°C (86.9°F) in August.
Humidity levels are quite high throughout the year, maintaining a steady range from 70% in December to 84% in May, contributing to the overall warm, moist climate. Precipitation is another key element of Sai Wan's weather. The area sees a stark shift between relatively drier winters and an extensive monsoon season. Rainfall rises steadily from 25mm (0.98") in January, peaking at 223mm (8.78") in August before receding again to 23mm (0.91") in December. This has a corresponding effect on the number of rainfall days - these escalate from 12.6 days in January to a peak of 26.8 in July.
Despite the regular rainfall, sunlight is not scarce. Values range from 10.9 daylight hours in January to a maximum of 13.5 hours in June. However, actual sunshine duration hovers between 5.3 hours per day in March and reaches up to 10 hours in July. As for UV index, it goes from a moderate 4 in January and February to a high of 7 during the period between May to September. Cloud cover shows a moderate fluctuation from 35% in September and October to 61% in March.
Wind speed varies within small brackets throughout the year, with an average of 12.4km/h (7.7mph) in August and reaching 16km/h (9.9mph) in December, while visibility remains consistently high at 9-10km (-6.2mi).
Humidity levels are quite high throughout the year, maintaining a steady range from 70% in December to 84% in May, contributing to the overall warm, moist climate. Precipitation is another key element of Sai Wan's weather. The area sees a stark shift between relatively drier winters and an extensive monsoon season. Rainfall rises steadily from 25mm (0.98") in January, peaking at 223mm (8.78") in August before receding again to 23mm (0.91") in December. This has a corresponding effect on the number of rainfall days - these escalate from 12.6 days in January to a peak of 26.8 in July.
Despite the regular rainfall, sunlight is not scarce. Values range from 10.9 daylight hours in January to a maximum of 13.5 hours in June. However, actual sunshine duration hovers between 5.3 hours per day in March and reaches up to 10 hours in July. As for UV index, it goes from a moderate 4 in January and February to a high of 7 during the period between May to September. Cloud cover shows a moderate fluctuation from 35% in September and October to 61% in March.
Wind speed varies within small brackets throughout the year, with an average of 12.4km/h (7.7mph) in August and reaching 16km/h (9.9mph) in December, while visibility remains consistently high at 9-10km (-6.2mi).
The best time to visit Sai Wan
Selecting the optimal time for a visit to Sai Wan is closely tied to the visitor's personal preferences in terms of weather. For those who enjoy warmer climate and long days, May through September can be considered favourable. With temperatures ranging from 24.5°C (76.1°F) to 30.5°C (86.9°F) and daylight duration extending to 13.5 hours, these months offer ample opportunity for outdoor activities. The UV index does climb to 7 during this time, so sun protection measures are advisable.
The worst time to visit Sai Wan
Converse to the best visiting period, the least conducive time to tour Sai Wan would be the winter months from November to January. Although temperatures remain mild at 19.6°C (67.3°F) to 23.9°C (75°F), the shorter days - 10.8 to 11.1 daylight hours - might not be appealing to all. Additionally, these months record the lowest sunshine hours, declining to 5.4 to 5.7 per day.
Spring weather in Sai Wan
Spring, the transitional season from March to May, sees a steady rise in various weather parameters. The temperature climbs from 21.7°C (71.1°F) to 27.7°C (81.9°F), while daylight grows from 12 to 13.2 hours. The UV index also escalates to moderate levels. Rainfall, however, witnesses a significant jump during this period, from 44mm (1.73") to 171mm (6.73"), accompanying a rise in relative humidity from 80% to 84%.
Summer weather in Sai Wan
The summer months from June through August present the warmest and longest days in Sai Wan. Temperatures peak at 30.5°C (86.9°F), and daylight lasts a substantial 13.4 to 13.5 hours. Despite the rise in temperature, the relative humidity drops to 80% to 83%. Rainfall intensity also increases, culminating in 206mm (8.11") to 223mm (8.78"). Simultaneously, the UV index hits 7, indicating a high level of UV radiation.
Autumn weather in Sai Wan
Autumn in Sai Wan, from September through November, sees a gradual decline in weather parameters from their summer peaks. Temperatures drop from 29.6°C (85.3°F) to 23.9°C (75°F), while daylight hours reduce to 12.3 to 11.1. The rainfall also subsides, with the amount falling to 71mm (2.8") in October. Additionally, relative humidity reduces to a range from 75% to 77%.
Winter weather in Sai Wan
Winters in Sai Wan, occurring from December to February, are mild with appreciable variations in weather factors. Temperatures range between 15°C (59°F) and 19.7°C (67.5°F), while daylight hours limit between 10.9 and 11.4. Relative humidity reduces to its lowest annual level at 70% -73% in December and January, that accompanies the least rainfall of 23mm (0.91") and 25mm (0.98") respectively. The UV index also stays at the lowest annual level of 4 during these months.
Weather in January
Venturing into the new year, January in Sai Wan, Hong Kong, presents mild summer conditions. Temperatures do not fluctuate dramatically, pastoral warmth spreads across the city. Higher humidity levels give a hint of sweatiness, yet it's a reasonable amount of moisture. Weather in January »
Weather in February
Notably different from January, February's weather is a momentous increase in rainfall, humid afternoons, and ever slightly warmer temperatures in Sai Wan. These conditions encourage an uptick in indoor activities. Despite the increasing humidity, this month is not unmanageably humid. Weather in February »
Weather in March
March transitions into notable warmth - a gentle nudge towards summer in Sai Wan. There are more humid afternoons coupled with vivid microbursts of rain through the month, symbolizing a distinct change in city's atmosphere. March stands out for its increase in rainfall, ushering in a period of revitalization for nature. Weather in March »
Weather in April
A significant shift arises in April's weather as Sai Wan bathes in the early summer's glow. The clear skies and calm breezes experienced in March are replaced with more humid afternoons and heavier rainfall. Nature now mirrors a vibrant portrait, with blooming flora painting Sai Wan in an array of colors. Weather in April »
Weather in May
May introduces higher temperatures and abundant sunshine in Sai Wan, Hong Kong. Despite the rise in humidity and substantial rainfall, the city retains its allure. The city becomes a vibrant relay of changing weather patterns and ever-increasing temperatures. Weather in May »
Weather in June
As summertime begins in earnest, June sees the atmosphere in Sai Wan turning increasingly tropical. The city is filled with a pulsating energy, an echo of the heated environment. While the rising temperatures might be daunting for the uninitiated, the city natives find a rhythmic sway in their step. Weather in June »
Weather in July
July takes the baton from June, continuing the warm summer extravaganza in Sai Wan. This month sees the city dipping into languid afternoon siestas under the balmy weather. The marine cityscape resonates with the high-pitched call of seagulls, their symphony in perfect cadence with the sizzling weather. Weather in July »
Weather in August
The sultry August weather takes center stage in Sai Wan, with temperatures maintaining their summer vibrancy. The city pulsates with the steady throb of tropical heat, interspersed with bold bouts of rainfall. Despite fatigue from the lengthened summer, the city entertains with a plethora of summer events. Weather in August »
Weather in September
September starts to slowly wind down from the peak of summer in Sai Wan. The city sees a fusion of late summer heat and the early arrival of autumnal cool breezes. Despite the first rustle of fallen leaves, afternoons remain sweltering, and the city's general atmosphere carries a residual humidity. Weather in September »
Weather in October
Sai Wan welcomes October with the gentle onset of autumn, underscoring its diverse climatic experience. This month, packed with autumnal hues, offers welcome change from the tropical summer of the previous months. The warmth starts to wane, providing a respite to the city inhabitants. Weather in October »
Weather in November
November dips deeper into autumn, with Sai Wan slowly preparing for winter's arrival. The city undergoes subtle changes in its landscape - the leaves start to wilt, and the sun sets slightly earlier, painting the cityscape in a warm, orange hue. Weather in November »
Weather in December
December brings the year to a close with a mild wisp of winter in Sai Wan. The month sees a noticeable decrease in temperature and rainfall. Winter in Sai Wan is far from harsh, presenting a rather subtle, softer version of the season. Weather in December »
Updated: Feb 19, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the coldest months in Sai Wan?
Sai Wan notes the coldest temperatures in January, with a average high of 18.5°C (65.3°F) and a low of 15°C (59°F).
How many days does it rain in Sai Wan?
Throughout the year, in Sai Wan, there are 224.5 rainfall days, and 1264mm (49.76") of precipitation is accumulated.
When is the lowest UV index in Sai Wan?
The month with the lowest UV index in Sai Wan is January, with an average maximum UV index of 4.
What is the month with the least sunshine in Sai Wan?
With an average of 5.3h of sunshine, March has the least sunshine of the year in Sai Wan.
What is the most humid month in Sai Wan?
May is the most humid month in Sai Wan, with an average relative humidity of 84%.
What are the months with the highest UV index in Sai Wan?
The months with the highest UV index are May through September, with an average maximum UV index of 7.
When are the longest days in Sai Wan?
June has the longest days of the year in Sai Wan, Hong Kong, with an average of 13h and 30min of daylight.
What month has the most sunshine in Sai Wan?
With an average of 10h of sunshine, July has the most sunshine of the year in Sai Wan.
What part of the year is the hottest in Sai Wan?
August, with average temperatures reaching a high of 30.5°C (86.9°F) and a low of 27.7°C (81.9°F), is the warmest month in Sai Wan, Hong Kong.
What is the wettest month in Sai Wan?
The month with the most rainfall in Sai Wan, Hong Kong, is August, when the rain falls for 25.8 days and typically aggregates up to 223mm (8.78") of precipitation.
What is the least humid month in Sai Wan?
With an average relative humidity of 70%, December is the least humid month in Sai Wan.
What is the driest month in Sai Wan?
The month with the least rainfall in Sai Wan is December, when the rain falls for 11.2 days and typically collects 23mm (0.91") of precipitation.
What is the month with the shortest days in Sai Wan?
The month with the shortest days is December, with an average of 10h and 48min of daylight.
Is there Daylight Saving Time (DST) in Sai Wan?
Sai Wan does not observe Daylight Saving Time (DST). HKT timezone is used throughout the entire year.
Average temperature
Sai Wan, Hong Kong
The warmest month (with the highest average high temperature) is August (30.5°C).
The month with the lowest average high temperature is January (18.5°C).
The month with the highest average low temperature is August (27.7°C).
The coldest month (with the lowest average low temperature) is January (15°C).
Average pressure
Sai Wan, Hong Kong
- Average pressure in January:
1020.3mbar - Average pressure in February:
1018.4mbar - Average pressure in March:
1016.3mbar - Average pressure in April:
1013mbar - Average pressure in May:
1009mbar - Average pressure in June:
1005.6mbar
- Average pressure in July:
1005.3mbar - Average pressure in August:
1004.8mbar - Average pressure in September:
1008.3mbar - Average pressure in October:
1013.4mbar - Average pressure in November:
1016.7mbar - Average pressure in December:
1019.6mbar
The month with the highest atmospheric pressure is January (1020.3mbar).
The month with the lowest atmospheric pressure is August (1004.8mbar).
Average wind speed
Sai Wan, Hong Kong
- Average wind speed in January:
15.5km/h - Average wind speed in February:
15km/h - Average wind speed in March:
14.8km/h - Average wind speed in April:
13.8km/h - Average wind speed in May:
13.6km/h - Average wind speed in June:
14.3km/h
- Average wind speed in July:
14.7km/h - Average wind speed in August:
12.4km/h - Average wind speed in September:
13.5km/h - Average wind speed in October:
15.3km/h - Average wind speed in November:
15.5km/h - Average wind speed in December:
16km/h
The windiest month (with the highest average wind speed) is December (16km/h).
The calmest month (with the lowest average wind speed) is August (12.4km/h).
Average humidity
Sai Wan, Hong Kong
The month with the highest relative humidity is May (84%).
The month with the lowest relative humidity is December (70%).
Average rainfall
Sai Wan, Hong Kong
- Average rainfall in January:
25mm - Average rainfall in February:
32mm - Average rainfall in March:
44mm - Average rainfall in April:
86mm - Average rainfall in May:
171mm - Average rainfall in June:
206mm
The wettest month (with the highest rainfall) is August (223mm).
The driest month (with the least rainfall) is December (23mm).
Average rainfall days
Sai Wan, Hong Kong
- Average rainfall days in January:
12.6 days - Average rainfall days in February:
15 days - Average rainfall days in March:
18.2 days - Average rainfall days in April:
18 days - Average rainfall days in May:
22.9 days - Average rainfall days in June:
25.1 days
- Average rainfall days in July:
26.8 days - Average rainfall days in August:
25.8 days - Average rainfall days in September:
22.7 days - Average rainfall days in October:
14.1 days - Average rainfall days in November:
12.1 days - Average rainfall days in December:
11.2 days
The month with the highest number of rainy days is July (26.8 days).
The month with the least rainy days is December (11.2 days).
Average daylight / Average sunshine
Sai Wan, Hong Kong
- Average daylight in January:
10h and 5min - Average daylight in February:
11h and 2min - Average daylight in March:
12h and 0min - Average daylight in April:
12h and 4min - Average daylight in May:
13h and 1min - Average daylight in June:
13h and 3min
- Average daylight in July:
13h and 2min - Average daylight in August:
12h and 5min - Average daylight in September:
12h and 2min - Average daylight in October:
11h and 4min - Average daylight in November:
11h and 1min - Average daylight in December:
10h and 5min
The month with the longest days is June (Average daylight: 13h and 30min).
The month with the shortest days is December (Average daylight: 10h and 48min).
- Average sunshine in January:
5h and 5min - Average sunshine in February:
5h and 4min - Average sunshine in March:
5h and 2min - Average sunshine in April:
6h and 4min - Average sunshine in May:
8h and 2min - Average sunshine in June:
9h and 3min
- Average sunshine in July:
10h and 0min - Average sunshine in August:
8h and 5min - Average sunshine in September:
8h and 2min - Average sunshine in October:
6h and 5min - Average sunshine in November:
5h and 4min - Average sunshine in December:
5h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is March (Average sunshine: 5h and 18min).
Average sunshine days
Sai Wan, Hong Kong
- Average sunshine days in January:
15.3 days - Average sunshine days in February:
9.7 days - Average sunshine days in March:
8.3 days - Average sunshine days in April:
8.3 days - Average sunshine days in May:
5.6 days - Average sunshine days in June:
3.2 days
- Average sunshine days in July:
3.1 days - Average sunshine days in August:
3.7 days - Average sunshine days in September:
5.8 days - Average sunshine days in October:
13.5 days - Average sunshine days in November:
13.4 days - Average sunshine days in December:
16.9 days
The month with the most sunshine days is December (16.9 days).
The month with the least sunshine days is July (3.1 days).
Average UV index
Sai Wan, Hong Kong
The months with the highest UV index are May, June, July, August and September (UV index 7).
The month with the lowest UV index is January (UV index 4).
Average cloud cover
Sai Wan, Hong Kong
The month with the most cloud cover is March (Cloud cover 61).
The months with the least cloud cover are September and October (Cloud cover 35).
Average visibility
Sai Wan, Hong Kong
The months with the highest visibility are September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July and August (9km).
