Kiên Hải in Summer
In summer (June, July and August), Kiên Hải sees average daytime highs around 28°C and overnight lows near 27°C, with 1069 mm of rain over about 83 wet days across the season. It is the 2nd-warmest season and the wettest season of the year.
Across summer, daytime highs hold fairly steady around 28°C. The sky is clear or mostly clear about 3% of the time across summer, and the air most often feels miserable.
Summer is Kiên Hải's weakest season of the year to visit on our travel score. Kiên Hải has little temperature swing across the year, so its calendar seasons blur — the season framing matters less here than for a place with four distinct seasons. For the whole year in context, see Kiên Hải's year-round climate.
- Avg daytime high
- 28°C
- 2nd-warmest season
- Avg overnight low
- 27°C
- Rainfall
- 1069 mm
- 83 wet days
- Avg wind
- 22 km/h
- Travel score
- 3.3
- weakest season of the year
- Months
- Jun · Jul · Aug
Temperature in Kiên Hải in Summer
Across summer, daytime highs hold fairly steady around 28°C.
A typical summer day in Kiên Hải reaches about 28°C and drops to 27°C overnight. The warmest of the three months is June, the coolest August.
How summer really feels in Kiên Hải
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.
Kiên Hải 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 | 28° / 25° | 21 | 4.7 | 11.5 | 6.8 |
| Feb | 29° / 25° | 13 | 3 | 11.7 | 6.6 |
| Mar | 30° / 26° | 38 | 7.2 | 11.9 | 5.7 |
| Apr | 30° / 27° | 92 | 15.6 | 12.2 | 4.4 |
| May | 29° / 27° | 267 | 26.5 | 12.5 | 3.2 |
| Jun | 29° / 27° | 346 | 26.8 | 12.6 | 3.2 |
| Jul | 28° / 27° | 373 | 28 | 12.5 | 3.3 |
| Aug | 28° / 26° | 350 | 27.7 | 12.3 | 3.4 |
| Sep | 28° / 26° | 380 | 26.9 | 12.1 | 3.5 |
| Oct | 28° / 26° | 316 | 27.5 | 11.8 | 3.5 |
| Nov | 29° / 26° | 119 | 16.8 | 11.5 | 4.6 |
| Dec | 28° / 25° | 54 | 8.7 | 11.4 | 6.0 |
Cloud cover in Summer
The sky is clear or mostly clear about 3% of the time across summer.
Chance of precipitation in Summer
Kiên Hải gets around 1069 mm of rain over 83 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 22 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 12 h 30 min in early June to 12 h 12 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 4.6 kWh/m².
Hazard calendar for Kiên Hải
In summer, Kiên Hải overlaps its pacific typhoon and monsoon season. The full year is below, with each hazard's peak months called out.
Kiên Hải sits in the Pacific typhoon belt; the season peaks July–October.
Kiên Hải's monsoon runs May–October, when most of the year's rain falls.
Is summer a good time to visit Kiên Hải?
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 Kiên Hải.
What to pack for Kiên Hải in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Kiên Hải sees daytime highs around 28°C and nights near 27°C. Pack light clothes and rain gear. Worth having: sun protection and a windbreaker. About 83 days see rain.
Sea temperature near Kiên Hải in Summer
The nearest coast averages about 29°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 May at about 31°C and coldest in January near 27°C.
The water stays above 20°C all year — warm enough for a swim any month.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 27 | 28 | 29 | 30 | 31 | 30 | 29 | 29 | 29 | 29 | 29 | 28 |
| Comfort | Warm | Warm | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Warm |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 27 | Warm |
| Feb | 28 | Warm |
| Mar | 29 | Tropical |
| Apr | 30 | Tropical |
| May | 31 | Tropical |
| Jun | 30 | Tropical |
| Jul | 29 | Tropical |
| Aug | 29 | Tropical |
| Sep | 29 | Tropical |
| Oct | 29 | Tropical |
| Nov | 29 | Tropical |
| Dec | 28 | Warm |
UV index in Kiên Hải 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 Kiên Hải peaks around August 20 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 14 at about 9 (very 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) | 10 | 11 | 12 | 12 | 11 | 12 | 12 | 13 | 13 | 10 | 9 | 9 |
| Level | Very high | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | Very high | Very high |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 10 | Very high |
| Feb | 11 | Extreme |
| Mar | 12 | Extreme |
| Apr | 12 | Extreme |
| May | 11 | Extreme |
| Jun | 12 | Extreme |
| Jul | 12 | Extreme |
| Aug | 13 | Extreme |
| Sep | 13 | Extreme |
| Oct | 10 | Very high |
| Nov | 9 | Very high |
| Dec | 9 | Very high |
Air quality in Kiên Hải 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 Kiên Hải is worst in January — around 45 µg/m³ PM2.5 (poor), about 2.4× the cleanest month (August, 19 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) | 45 | 37 | 33 | 32 | 27 | 22 | 22 | 19 | 23 | 32 | 42 | 45 |
| Level | Poor | Poor | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Poor | Poor |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 45 | Poor |
| Feb | 37 | Poor |
| Mar | 33 | Moderate |
| Apr | 32 | Moderate |
| May | 27 | Moderate |
| Jun | 22 | Moderate |
| Jul | 22 | Moderate |
| Aug | 19 | Moderate |
| Sep | 23 | Moderate |
| Oct | 32 | Moderate |
| Nov | 42 | Poor |
| Dec | 45 | Poor |
Where is Kiên Hải?
Kiên Hải sits at 10.0°N, 104.8°E, 18 m above sea level, in Vietnam. The nearest listed city is Rạch Giá, 26 km away.
Topography around Kiên Hải
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Kiên Hải.
Within 3 km, the terrain around Kiên Hải has significant variations in elevation — a maximum elevation change of 400 m around an average of 18 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 400 m; within 80 km, large variations in elevation — a maximum elevation change of 691 m.
The land around Kiên Hải is covered by water (85%) within 3 km, water (98%) within 16 km, and water (48%) and cropland (41%) within 80 km.
Vietnam travel facts
- Travel advisory
- Level 1
- Exercise Normal Precautions
- Power plugs
- Type A / B / C / F
- 220 V · 50 Hz
- Prices
- ≈ 29% of US
- price level, 2025
- GDP per capita
- $5,066
- 2025
- Happiness
- 6.4 / 10
- World Happiness, 2025
- Safe drinking water
- 59%
- of population, 2024
- Homicide rate
- 1.5
- per 100k, 2011
- Road deaths
- 30.6
- per 100k/yr, 2019
- Income group
- Upper middle
- World Bank
- English
- Moderate
- EF EPI 500
- 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 Kiên Hải (9.9727°, 104.8475°, elevation 18 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.