Thị Trấn Ba Chẽ in Fall
In fall (September, October and November), Thị Trấn Ba Chẽ sees average daytime highs around 28°C and overnight lows near 21°C, with 363 mm of rain over about 38 wet days across the season. It is the 2nd-warmest season and the 2nd-wettest season.
Over the season highs ease from about 30°C in early September to 23°C by late November. The sky is clear or mostly clear about 33% of the time across fall, and the air most often feels oppressive.
Fall is Thị Trấn Ba Chẽ's 2nd-best season to visit on our travel score. For the whole year in context, see Thị Trấn Ba Chẽ's year-round climate.
- Avg daytime high
- 28°C
- 2nd-warmest season
- Avg overnight low
- 21°C
- Rainfall
- 363 mm
- 38 wet days
- Avg wind
- 8 km/h
- Travel score
- 5.6
- 2nd-best season
- Months
- Sep · Oct · Nov
Temperature in Thị Trấn Ba Chẽ in Fall
Over the season highs ease from about 30°C in early September to 23°C by late November.
A typical fall day in Thị Trấn Ba Chẽ reaches about 28°C and drops to 21°C overnight. The warmest of the three months is September, the coolest November.
How fall really feels in Thị Trấn Ba Chẽ
Once humidity and wind are folded in, fall brings about 33 days that feel above 32°C and 0 that feel at or below 0°C.
The story in fall is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Thị Trấn Ba Chẽ weather by month
How the three fall months (September, October and November) 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° | 34 | 6.3 | 10.8 | 6.2 |
| Feb | 20° / 15° | 21 | 5.4 | 11.3 | 6.4 |
| Mar | 22° / 17° | 45 | 8.2 | 11.8 | 6.5 |
| Apr | 26° / 21° | 64 | 11.5 | 12.5 | 6.0 |
| May | 29° / 24° | 208 | 19.7 | 13 | 4.0 |
| Jun | 31° / 26° | 298 | 24 | 13.3 | 2.8 |
| Jul | 31° / 26° | 338 | 25.6 | 13.2 | 2.8 |
| Aug | 31° / 25° | 374 | 26.3 | 12.7 | 2.8 |
| Sep | 30° / 24° | 227 | 19.5 | 12.1 | 3.7 |
| Oct | 28° / 22° | 87 | 10.4 | 11.5 | 6.0 |
| Nov | 25° / 18° | 49 | 7.9 | 11 | 7.2 |
| Dec | 21° / 14° | 33 | 6.3 | 10.7 | 6.8 |
Cloud cover in Fall
The sky is clear or mostly clear about 33% of the time across fall.
Chance of precipitation in Fall
Thị Trấn Ba Chẽ gets around 363 mm of rain over 38 wet days across fall. The line is the day-by-day chance of measurable precipitation.
Humidity in Fall
Most of fall feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Fall
Winds average 8 km/h across fall.
Sunrise & sunset in Fall
Daylight runs from about 12 h 24 min in early September to 10 h 48 min by late November. The lit band spans sunrise to sunset each day.
Solar energy in Fall
Average shortwave solar energy reaching the ground each day across fall, about 4.1 kWh/m².
Hazard calendar for Thị Trấn Ba Chẽ
In fall, Thị Trấn Ba Chẽ overlaps its pacific typhoon and monsoon season. The full year is below, with each hazard's peak months called out.
Thị Trấn Ba Chẽ sits in the Pacific typhoon belt; the season peaks July–October.
Thị Trấn Ba Chẽ's monsoon runs May–September, when most of the year's rain falls.
Is fall a good time to visit Thị Trấn Ba Chẽ?
Our two travel scores rate fall for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
fall is a reasonable time to visit Thị Trấn Ba Chẽ for sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Thị Trấn Ba Chẽ in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, Thị Trấn Ba Chẽ sees daytime highs around 28°C and nights near 21°C. Pack light clothes and rain gear. Worth having: sun protection. About 38 days see rain.
Sea temperature near Thị Trấn Ba Chẽ in Fall
The nearest coast averages about 27°C across fall — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 39 km away) is warmest in August at about 30°C and coldest in February near 19°C.
It's comfortable for a long swim from Mar 15 to Jan 4 — about 9.7 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 19 | 19 | 20 | 23 | 27 | 29 | 29 | 30 | 29 | 28 | 25 | 21 |
| Comfort | Cool | Cool | Refreshing | Refreshing | Warm | Tropical | Tropical | Tropical | Tropical | Warm | Warm | Refreshing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 19 | Cool |
| Feb | 19 | Cool |
| Mar | 20 | Refreshing |
| Apr | 23 | Refreshing |
| May | 27 | Warm |
| Jun | 29 | Tropical |
| Jul | 29 | Tropical |
| Aug | 30 | Tropical |
| Sep | 29 | Tropical |
| Oct | 28 | Warm |
| Nov | 25 | Warm |
| Dec | 21 | Refreshing |
UV index in Thị Trấn Ba Chẽ in Fall
Clear-sky midday UV across fall averages around 8 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Thị Trấn Ba Chẽ peaks around July 11 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 17 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) | 7 | 8 | 9 | 8 | 10 | 12 | 13 | 8 | 9 | 9 | 7 | 6 |
| Level | High | Very high | Very high | Very high | Extreme | Extreme | Extreme | Very high | Very high | Very high | High | High |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 7 | High |
| Feb | 8 | Very high |
| Mar | 9 | Very high |
| Apr | 8 | Very high |
| May | 10 | Extreme |
| Jun | 12 | Extreme |
| Jul | 13 | Extreme |
| Aug | 8 | Very high |
| Sep | 9 | Very high |
| Oct | 9 | Very high |
| Nov | 7 | High |
| Dec | 6 | High |
Air quality in Thị Trấn Ba Chẽ in Fall
Average fine-particle pollution (PM2.5) through the year — so you can see where fall falls, not just the annual average.
Air quality in Thị Trấn Ba Chẽ is worst in January — around 42 µg/m³ PM2.5 (poor), about 2.6× the cleanest month (July, 16 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) | 42 | 42 | 41 | 40 | 26 | 19 | 16 | 18 | 21 | 27 | 29 | 39 |
| Level | Poor | Poor | Poor | Poor | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Poor |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 42 | Poor |
| Feb | 42 | Poor |
| Mar | 41 | Poor |
| Apr | 40 | Poor |
| May | 26 | Moderate |
| Jun | 19 | Moderate |
| Jul | 16 | Moderate |
| Aug | 18 | Moderate |
| Sep | 21 | Moderate |
| Oct | 27 | Moderate |
| Nov | 29 | Moderate |
| Dec | 39 | Poor |
Where is Thị Trấn Ba Chẽ?
Thị Trấn Ba Chẽ sits at 21.3°N, 107.3°E, 16 m above sea level, in Vietnam. The nearest listed city is Thị Trấn Tiên Yên, 14 km away.
Topography around Thị Trấn Ba Chẽ
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Thị Trấn Ba Chẽ.
Within 3 km, the terrain around Thị Trấn Ba Chẽ has significant variations in elevation — a maximum elevation change of 422 m around an average of 94 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 885 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,603 m.
The land around Thị Trấn Ba Chẽ is covered by trees (88%) within 3 km, trees (82%) within 16 km, and trees (57%) and water (35%) 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 Thị Trấn Ba Chẽ (21.2716°, 107.2836°, 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.