Sơn Tây in Winter
In winter (December, January and February), Sơn Tây sees average daytime highs around 21°C and overnight lows near 16°C, with 92 mm of rain over about 23 wet days across the season. It is the coldest season of the year and the driest season of the year.
Across winter, daytime highs hold fairly steady around 21°C. The sky is clear or mostly clear about 18% of the time across winter, and the air most often feels dry.
Winter is Sơn Tây's best season of the year to visit on our travel score. For the whole year in context, see Sơn Tây's year-round climate.
- Avg daytime high
- 21°C
- coldest season of the year
- Avg overnight low
- 16°C
- Rainfall
- 92 mm
- 23 wet days
- Avg wind
- 5 km/h
- Travel score
- 6.6
- best season of the year
- Months
- Dec · Jan · Feb
Temperature in Sơn Tây in Winter
Across winter, daytime highs hold fairly steady around 21°C.
A typical winter day in Sơn Tây reaches about 21°C and drops to 16°C overnight. The warmest of the three months is December, the coolest January.
How winter really feels in Sơn Tây
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.
Sơn Tây 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 | 20° / 15° | 37 | 8.3 | 10.9 | 6.2 |
| Feb | 22° / 16° | 26 | 7.9 | 11.3 | 6.5 |
| Mar | 25° / 19° | 48 | 10.4 | 11.9 | 6.4 |
| Apr | 29° / 22° | 81 | 10.7 | 12.5 | 5.2 |
| May | 32° / 25° | 201 | 17.4 | 13 | 3.2 |
| Jun | 33° / 27° | 215 | 18.2 | 13.3 | 2.4 |
| Jul | 33° / 27° | 251 | 20.5 | 13.2 | 2.4 |
| Aug | 33° / 26° | 311 | 22.1 | 12.7 | 2.5 |
| Sep | 32° / 25° | 201 | 17.9 | 12.1 | 3.3 |
| Oct | 29° / 23° | 100 | 10.5 | 11.5 | 5.4 |
| Nov | 26° / 19° | 48 | 6.7 | 11 | 7.2 |
| Dec | 22° / 16° | 29 | 6.5 | 10.7 | 7.1 |
Cloud cover in Winter
The sky is clear or mostly clear about 18% of the time across winter.
Chance of precipitation in Winter
Sơn Tây gets around 92 mm of rain over 23 wet days across winter. The line is the day-by-day chance of measurable precipitation.
Humidity in Winter
Most of winter feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Winter
Winds average 5 km/h across winter.
Sunrise & sunset in Winter
Daylight runs from about 10 h 48 min in early December to 11 h 30 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 2.4 kWh/m².
Hazard calendar for Sơn Tây
In winter, Sơn Tây overlaps its pacific typhoon season. The full year is below, with each hazard's peak months called out.
Sơn Tây sits in the Pacific typhoon belt; the season peaks July–October.
Sơn Tây's monsoon runs May–September, when most of the year's rain falls.
Is winter a good time to visit Sơn Tây?
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 Sơn Tây for sightseeing.
What to pack for Sơn Tây in Winter
From winter's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In winter, Sơn Tây sees daytime highs around 21°C and nights near 16°C. Worth packing: rain gear. About 23 days see rain.
UV index in Sơn Tây in Winter
Clear-sky midday UV across winter averages around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Sơn Tây peaks around June 20 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near November 21 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 | 7 | 9 | 6 | 7 | 11 | 10 | 9 | 7 | 8 | 6 | 6 |
| Level | High | High | Very high | High | Very high | Extreme | Extreme | Very high | High | Very high | High | High |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 6 | High |
| Feb | 7 | High |
| Mar | 9 | Very high |
| Apr | 6 | High |
| May | 7 | Very high |
| Jun | 11 | Extreme |
| Jul | 10 | Extreme |
| Aug | 9 | Very high |
| Sep | 7 | High |
| Oct | 8 | Very high |
| Nov | 6 | High |
| Dec | 6 | High |
Air quality in Sơn Tây 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 Sơn Tây is worst in December — around 171 µg/m³ PM2.5 (very unhealthy), about 3.4× the cleanest month (July, 50 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) | 161 | 136 | 122 | 106 | 76 | 59 | 50 | 68 | 96 | 125 | 152 | 171 |
| Level | Very unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Poor | Unhealthy | Unhealthy | Unhealthy | Very unhealthy | Very unhealthy |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 161 | Very unhealthy |
| Feb | 136 | Unhealthy |
| Mar | 122 | Unhealthy |
| Apr | 106 | Unhealthy |
| May | 76 | Unhealthy |
| Jun | 59 | Unhealthy |
| Jul | 50 | Poor |
| Aug | 68 | Unhealthy |
| Sep | 96 | Unhealthy |
| Oct | 125 | Unhealthy |
| Nov | 152 | Very unhealthy |
| Dec | 171 | Very unhealthy |
Where is Sơn Tây?
Sơn Tây sits at 21.1°N, 105.5°E, 16 m above sea level, in Vietnam. The nearest listed city is Ba Vì, 14 km away.
Topography around Sơn Tây
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Sơn Tây.
Within 3 km, the terrain around Sơn Tây has only modest variations in elevation — a maximum elevation change of 32 m around an average of 13 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 694 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,677 m.
The land around Sơn Tây is covered by trees (42%), artificial surfaces (22%) and cropland (21%) within 3 km, trees (44%) and cropland (33%) within 16 km, and trees (66%) and cropland (22%) 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 Sơn Tây (21.1405°, 105.5069°, elevation 16 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.