Hoàn Lão in Summer
In summer (June, July and August), Hoàn Lão sees average daytime highs around 31°C and overnight lows near 27°C, with 303 mm of rain over about 32 wet days across the season. It is the warmest season of the year and the 3rd-wettest season.
Across summer, daytime highs hold fairly steady around 31°C. The sky is clear or mostly clear about 12% of the time across summer, and the air most often feels oppressive.
Summer is Hoàn Lão's weakest season of the year to visit on our travel score. For the whole year in context, see Hoàn Lão's year-round climate.
- Avg daytime high
- 31°C
- warmest season of the year
- Avg overnight low
- 27°C
- Rainfall
- 303 mm
- 32 wet days
- Avg wind
- 16 km/h
- Travel score
- 3.9
- weakest season of the year
- Months
- Jun · Jul · Aug
Temperature in Hoàn Lão in Summer
Across summer, daytime highs hold fairly steady around 31°C.
A typical summer day in Hoàn Lão reaches about 31°C and drops to 27°C overnight. The warmest of the three months is June, the coolest August.
How summer really feels in Hoàn Lão
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.
Hoàn Lão 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 | 21° / 18° | 125 | 17.4 | 11.1 | 5.2 |
| Feb | 22° / 18° | 77 | 13.8 | 11.4 | 5.8 |
| Mar | 25° / 21° | 82 | 13.3 | 11.9 | 6.2 |
| Apr | 28° / 23° | 88 | 12.8 | 12.4 | 5.6 |
| May | 30° / 26° | 112 | 14.7 | 12.8 | 4.2 |
| Jun | 32° / 27° | 63 | 8.1 | 13 | 3.9 |
| Jul | 32° / 27° | 94 | 10 | 12.9 | 3.9 |
| Aug | 31° / 26° | 146 | 13.5 | 12.6 | 3.9 |
| Sep | 29° / 25° | 345 | 19.6 | 12.1 | 3.9 |
| Oct | 27° / 24° | 531 | 24 | 11.6 | 4.5 |
| Nov | 25° / 21° | 366 | 20.9 | 11.2 | 4.9 |
| Dec | 22° / 19° | 228 | 20.3 | 11 | 4.8 |
Cloud cover in Summer
The sky is clear or mostly clear about 12% of the time across summer.
Chance of precipitation in Summer
Hoàn Lão gets around 303 mm of rain over 32 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 16 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 13 hours in early June to 12 h 24 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 5.3 kWh/m².
Hazard calendar for Hoàn Lão
In summer, Hoàn Lão overlaps its pacific typhoon season. The full year is below, with each hazard's peak months called out.
Hoàn Lão sits in the Pacific typhoon belt; the season peaks July–October.
Hoàn Lão's monsoon runs September–November, when most of the year's rain falls.
Is summer a good time to visit Hoàn Lão?
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 Hoàn Lão. The water and warmth also suit a beach or pool day.
What to pack for Hoàn Lão in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Hoàn Lão sees daytime highs around 31°C and nights near 27°C. Pack light clothes. Worth having: rain gear and sun protection. About 32 days see rain.
Sea temperature near Hoàn Lão 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 August at about 30°C and coldest in February near 22°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) | 22 | 22 | 23 | 25 | 28 | 29 | 29 | 30 | 29 | 28 | 26 | 24 |
| Comfort | Refreshing | Refreshing | Refreshing | Warm | Warm | Tropical | Tropical | Tropical | Tropical | Warm | Warm | Refreshing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 22 | Refreshing |
| Feb | 22 | Refreshing |
| Mar | 23 | Refreshing |
| Apr | 25 | Warm |
| May | 28 | Warm |
| Jun | 29 | Tropical |
| Jul | 29 | Tropical |
| Aug | 30 | Tropical |
| Sep | 29 | Tropical |
| Oct | 28 | Warm |
| Nov | 26 | Warm |
| Dec | 24 | Refreshing |
UV index in Hoàn Lão in Summer
Clear-sky midday UV across summer averages around 13 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Hoàn Lão peaks around August 12 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 16 at about 7 (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) | 8 | 10 | 10 | 9 | 12 | 12 | 13 | 13 | 11 | 10 | 8 | 7 |
| Level | Very high | Extreme | Very high | Very high | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | High |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 8 | Very high |
| Feb | 10 | Extreme |
| Mar | 10 | Very high |
| Apr | 9 | Very high |
| May | 12 | Extreme |
| Jun | 12 | Extreme |
| Jul | 13 | Extreme |
| Aug | 13 | Extreme |
| Sep | 11 | Extreme |
| Oct | 10 | Extreme |
| Nov | 8 | Very high |
| Dec | 7 | High |
Air quality in Hoàn Lão 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 Hoàn Lão is worst in April — around 65 µg/m³ PM2.5 (unhealthy), about 4.9× the cleanest month (July, 13 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) | 20 | 26 | 62 | 65 | 21 | 14 | 13 | 14 | 16 | 20 | 18 | 21 |
| Level | Moderate | Moderate | Unhealthy | Unhealthy | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 20 | Moderate |
| Feb | 26 | Moderate |
| Mar | 62 | Unhealthy |
| Apr | 65 | Unhealthy |
| May | 21 | Moderate |
| Jun | 14 | Moderate |
| Jul | 13 | Moderate |
| Aug | 14 | Moderate |
| Sep | 16 | Moderate |
| Oct | 20 | Moderate |
| Nov | 18 | Moderate |
| Dec | 21 | Moderate |
Where is Hoàn Lão?
Hoàn Lão sits at 17.6°N, 106.5°E, 10 m above sea level, in Vietnam. The nearest listed city is Đồng Hới, 16 km away.
Topography around Hoàn Lão
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Hoàn Lão.
Within 3 km, the terrain around Hoàn Lão has only modest variations in elevation — a maximum elevation change of 21 m around an average of 6 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 967 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,612 m.
The land around Hoàn Lão is covered by cropland (41%) within 3 km, water (42%) and trees (35%) within 16 km, and trees (61%) and water (32%) 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 Hoàn Lão (17.5844°, 106.5343°, elevation 10 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.