Sai Kung in Summer
In summer (June, July and August), Sai Kung sees average daytime highs around 31°C and overnight lows near 27°C, with 864 mm of rain over about 71 wet days across the season. It is the warmest season of the year and the wettest season of the year.
Across summer, daytime highs hold fairly steady around 31°C. The sky is clear or mostly clear about 15% of the time across summer, and the air most often feels miserable.
Summer is Sai Kung's weakest season of the year to visit on our travel score. For the whole year in context, see Sai Kung's year-round climate.
- Avg daytime high
- 31°C
- warmest season of the year
- Avg overnight low
- 27°C
- Rainfall
- 864 mm
- 71 wet days
- Avg wind
- 11 km/h
- Travel score
- 3.1
- weakest season of the year
- Months
- Jun · Jul · Aug
Temperature in Sai Kung in Summer
Across summer, daytime highs hold fairly steady around 31°C.
A typical summer day in Sai Kung reaches about 31°C and drops to 27°C overnight. The warmest of the three months is July, the coolest June.
How summer really feels in Sai Kung
Once humidity and wind are folded in, summer brings about 92 days that feel above 32°C and 0 that feel at or below 0°C.
The story in summer is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Sai Kung weather by month
How the three summer months (June, July and August) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 18° / 13° | 24 | 4 | 10.8 | 6.8 |
| Feb | 19° / 14° | 34 | 6.3 | 11.2 | 6.4 |
| Mar | 21° / 17° | 68 | 10.1 | 11.8 | 6.3 |
| Apr | 25° / 21° | 123 | 14.1 | 12.5 | 5.9 |
| May | 28° / 24° | 229 | 20 | 13.1 | 4.5 |
| Jun | 30° / 26° | 314 | 23.8 | 13.3 | 3.2 |
| Jul | 31° / 27° | 243 | 22.9 | 13.2 | 3.1 |
| Aug | 31° / 27° | 308 | 23.9 | 12.8 | 3.1 |
| Sep | 30° / 26° | 203 | 17 | 12.1 | 4.2 |
| Oct | 27° / 23° | 64 | 6.9 | 11.5 | 7.0 |
| Nov | 24° / 19° | 36 | 4.9 | 10.9 | 8.0 |
| Dec | 20° / 15° | 29 | 3.9 | 10.7 | 7.3 |
Cloud cover in Summer
The sky is clear or mostly clear about 15% of the time across summer.
Chance of precipitation in Summer
Sai Kung gets around 864 mm of rain over 71 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels miserable — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 11 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 13 h 18 min in early June to 12 h 30 min by late August. The lit band spans sunrise to sunset each day.
Solar energy in Summer
Average shortwave solar energy reaching the ground each day across summer, about 5.1 kWh/m².
Hazard calendar for Sai Kung
In summer, Sai Kung overlaps its pacific typhoon and monsoon season. The full year is below, with each hazard's peak months called out.
Sai Kung sits in the Pacific typhoon belt; the season peaks July–October.
Sai Kung's monsoon runs May–September, when most of the year's rain falls.
Is summer a good time to visit Sai Kung?
Our two travel scores rate summer for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
summer is a weaker month for outdoor sightseeing in Sai Kung.
What to pack for Sai Kung in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Sai Kung sees daytime highs around 31°C and nights near 27°C. Pack light clothes and rain gear. Worth having: sun protection. About 71 days see rain.
Sea temperature near Sai Kung in Summer
The nearest coast averages about 28°C across summer — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea offshore is warmest in July at about 29°C and coldest in January near 20°C.
It's comfortable for a long swim from Feb 23 to Jan 5 — about 10.4 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 20 | 20 | 21 | 23 | 26 | 28 | 29 | 29 | 28 | 27 | 24 | 21 |
| Comfort | Cool | Cool | Refreshing | Refreshing | Warm | Warm | Tropical | Tropical | Tropical | Warm | Refreshing | Refreshing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 20 | Cool |
| Feb | 20 | Cool |
| Mar | 21 | Refreshing |
| Apr | 23 | Refreshing |
| May | 26 | Warm |
| Jun | 28 | Warm |
| Jul | 29 | Tropical |
| Aug | 29 | Tropical |
| Sep | 28 | Tropical |
| Oct | 27 | Warm |
| Nov | 24 | Refreshing |
| Dec | 21 | Refreshing |
UV index in Sai Kung in Summer
Clear-sky midday UV across summer averages around 12 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Sai Kung peaks around July 13 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near January 10 at about 6 (high).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 6 | 8 | 9 | 9 | 10 | 12 | 12 | 11 | 10 | 8 | 7 | 6 |
| Level | High | Very high | Very high | Very high | Very high | Extreme | Extreme | Extreme | Very high | Very high | High | High |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 6 | High |
| Feb | 8 | Very high |
| Mar | 9 | Very high |
| Apr | 9 | Very high |
| May | 10 | Very high |
| Jun | 12 | Extreme |
| Jul | 12 | Extreme |
| Aug | 11 | Extreme |
| Sep | 10 | Very high |
| Oct | 8 | Very high |
| Nov | 7 | High |
| Dec | 6 | High |
Air quality in Sai Kung in Summer
Average fine-particle pollution (PM2.5) through the year — so you can see where summer falls, not just the annual average.
Air quality in Sai Kung is worst in January — around 183 µg/m³ PM2.5 (very unhealthy), about 2.5× the cleanest month (July, 73 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 183 | 175 | 165 | 149 | 115 | 83 | 73 | 85 | 119 | 127 | 157 | 156 |
| Level | Very unhealthy | Very unhealthy | Very unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Very unhealthy | Very unhealthy |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 183 | Very unhealthy |
| Feb | 175 | Very unhealthy |
| Mar | 165 | Very unhealthy |
| Apr | 149 | Unhealthy |
| May | 115 | Unhealthy |
| Jun | 83 | Unhealthy |
| Jul | 73 | Unhealthy |
| Aug | 85 | Unhealthy |
| Sep | 119 | Unhealthy |
| Oct | 127 | Unhealthy |
| Nov | 157 | Very unhealthy |
| Dec | 156 | Very unhealthy |
Where is Sai Kung?
Sai Kung sits at 22.4°N, 114.3°E, 54 m above sea level, in Hong Kong. The nearest listed city is Ma On Shan, 4.0 km away.
Topography around Sai Kung
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Sai Kung.
Within 3 km, the terrain around Sai Kung has large variations in elevation — a maximum elevation change of 629 m around an average of 126 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 941 m; within 80 km, large variations in elevation — a maximum elevation change of 1,012 m.
The land around Sai Kung is covered by trees (65%) and water (27%) within 3 km, trees (47%) and water (40%) within 16 km, and water (59%) and trees (26%) within 80 km.
Hong Kong travel facts
- Travel advisory
- Level 2
- Exercise Increased Caution
- Power plugs
- Type D / G / M
- 220 V · 50 Hz
- Prices
- ≈ 71% of US
- price level, 2025
- GDP per capita
- $56,983
- 2025
- Happiness
- 5.6 / 10
- World Happiness, 2025
- Safe drinking water
- 100%
- of population, 2024
- Homicide rate
- 0.4
- per 100k, 2023
- Income group
- High
- World Bank
- English
- Moderate
- EF EPI 538
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Sai Kung (22.3833°, 114.2667°, elevation 54 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.