Lý Sơn in Winter
In winter (December, January and February), Lý Sơn sees average daytime highs around 25°C and overnight lows near 22°C, with 487 mm of rain over about 50 wet days across the season. It is the coldest season of the year and the 2nd-wettest season.
Across winter, daytime highs hold fairly steady around 25°C. The sky is clear or mostly clear about 26% of the time across winter, and the air most often feels muggy.
Winter is Lý Sơn's best season of the year to visit on our travel score. For the whole year in context, see Lý Sơn's year-round climate.
- Avg daytime high
- 25°C
- coldest season of the year
- Avg overnight low
- 22°C
- Rainfall
- 487 mm
- 50 wet days
- Avg wind
- 16 km/h
- Travel score
- 5.8
- best season of the year
- Months
- Dec · Jan · Feb
Temperature in Lý Sơn in Winter
Across winter, daytime highs hold fairly steady around 25°C.
A typical winter day in Lý Sơn reaches about 25°C and drops to 22°C overnight. The warmest of the three months is December, the coolest January.
How winter really feels in Lý Sơn
Once humidity and wind are folded in, winter brings about 0 days that feel above 32°C and 0 that feel at or below 0°C.
winter sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Lý Sơn weather by month
How the three winter months (December, January and February) 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 | 24° / 22° | 125 | 16.8 | 11.2 | 5.9 |
| Feb | 25° / 22° | 71 | 10.6 | 11.5 | 6.8 |
| Mar | 27° / 24° | 72 | 8.9 | 11.9 | 7.0 |
| Apr | 29° / 25° | 54 | 7.6 | 12.3 | 6.1 |
| May | 31° / 27° | 82 | 12.1 | 12.7 | 4.4 |
| Jun | 32° / 28° | 65 | 11.3 | 12.9 | 3.7 |
| Jul | 32° / 28° | 81 | 12.8 | 12.8 | 3.8 |
| Aug | 31° / 28° | 116 | 17.3 | 12.5 | 3.4 |
| Sep | 30° / 26° | 273 | 22.7 | 12.1 | 3.4 |
| Oct | 28° / 25° | 375 | 25.1 | 11.7 | 4.0 |
| Nov | 27° / 24° | 377 | 22.5 | 11.3 | 4.6 |
| Dec | 25° / 23° | 291 | 23 | 11.1 | 4.8 |
Cloud cover in Winter
The sky is clear or mostly clear about 26% of the time across winter.
Chance of precipitation in Winter
Lý Sơn gets around 487 mm of rain over 50 wet days across winter. The line is the day-by-day chance of measurable precipitation.
Humidity in Winter
Most of winter feels muggy — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Winter
Winds average 16 km/h across winter.
Sunrise & sunset in Winter
Daylight runs from about 11 h 12 min in early December to 11 h 42 min by late February. The lit band spans sunrise to sunset each day.
Solar energy in Winter
Average shortwave solar energy reaching the ground each day across winter, about 3.9 kWh/m².
Hazard calendar for Lý Sơn
In winter, Lý Sơn overlaps its pacific typhoon and monsoon season. The full year is below, with each hazard's peak months called out.
Lý Sơn sits in the Pacific typhoon belt; the season peaks July–October.
Lý Sơn's monsoon runs September–December, when most of the year's rain falls.
Is winter a good time to visit Lý Sơn?
Our two travel scores rate winter for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
winter is a reasonable time to visit Lý Sơn for sightseeing.
What to pack for Lý Sơn in Winter
From winter's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In winter, Lý Sơn sees daytime highs around 25°C and nights near 22°C. Pack rain gear. Worth having: light clothes and sun protection. About 50 days see rain.
Sea temperature near Lý Sơn in Winter
The nearest coast averages about 24°C across winter — 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 24°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) | 24 | 24 | 25 | 26 | 28 | 29 | 29 | 30 | 29 | 28 | 27 | 25 |
| Comfort | Warm | Refreshing | Warm | Warm | Tropical | Tropical | Tropical | Tropical | Tropical | Warm | Warm | Warm |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 24 | Warm |
| Feb | 24 | Refreshing |
| Mar | 25 | Warm |
| Apr | 26 | Warm |
| May | 28 | Tropical |
| Jun | 29 | Tropical |
| Jul | 29 | Tropical |
| Aug | 30 | Tropical |
| Sep | 29 | Tropical |
| Oct | 28 | Warm |
| Nov | 27 | Warm |
| Dec | 25 | Warm |
UV index in Lý Sơn in Winter
Clear-sky midday UV across winter averages around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Lý Sơn 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 (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) | 9 | 11 | 12 | 12 | 12 | 12 | 13 | 13 | 11 | 11 | 9 | 7 |
| Level | Very high | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | High |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 9 | Very high |
| Feb | 11 | Extreme |
| Mar | 12 | Extreme |
| Apr | 12 | Extreme |
| May | 12 | Extreme |
| Jun | 12 | Extreme |
| Jul | 13 | Extreme |
| Aug | 13 | Extreme |
| Sep | 11 | Extreme |
| Oct | 11 | Extreme |
| Nov | 9 | Very high |
| Dec | 7 | High |
Air quality in Lý Sơn in Winter
Average fine-particle pollution (PM2.5) through the year — so you can see where winter falls, not just the annual average.
Air quality in Lý Sơn is worst in March — around 35 µg/m³ PM2.5 (moderate), about 2.3× the cleanest month (November, 15 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) | 19 | 22 | 35 | 34 | 28 | 23 | 17 | 17 | 17 | 17 | 15 | 16 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 19 | Moderate |
| Feb | 22 | Moderate |
| Mar | 35 | Moderate |
| Apr | 34 | Moderate |
| May | 28 | Moderate |
| Jun | 23 | Moderate |
| Jul | 17 | Moderate |
| Aug | 17 | Moderate |
| Sep | 17 | Moderate |
| Oct | 17 | Moderate |
| Nov | 15 | Moderate |
| Dec | 16 | Moderate |
Where is Lý Sơn?
Lý Sơn sits at 15.4°N, 109.1°E, 22 m above sea level, in Vietnam. The nearest listed city is Mỹ Lại, 32 km away.
Topography around Lý Sơn
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Lý Sơn.
Within 3 km, the terrain around Lý Sơn has only modest variations in elevation — a maximum elevation change of 163 m around an average of 8 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 163 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,379 m.
The land around Lý Sơn is covered by water (72%) within 3 km, water (99%) within 16 km, and water (66%) and trees (26%) 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 Lý Sơn (15.372°, 109.1189°, elevation 22 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.