Long Mỹ in Fall
In fall (September, October and November), Long Mỹ sees average daytime highs around 31°C and overnight lows near 24°C, with 784 mm of rain over about 76 wet days across the season. It is the 3rd-warmest season and the wettest season of the year.
Across fall, daytime highs hold fairly steady around 31°C. The sky is clear or mostly clear about 5% of the time across fall, and the air most often feels miserable.
Fall is Long Mỹ's 3rd-best season to visit on our travel score. For the whole year in context, see Long Mỹ's year-round climate.
- Avg daytime high
- 31°C
- 3rd-warmest season
- Avg overnight low
- 24°C
- Rainfall
- 784 mm
- 76 wet days
- Avg wind
- 8 km/h
- Travel score
- 2.8
- 3rd-best season
- Months
- Sep · Oct · Nov
Temperature in Long Mỹ in Fall
Across fall, daytime highs hold fairly steady around 31°C.
A typical fall day in Long Mỹ reaches about 31°C and drops to 24°C overnight. The warmest of the three months is October, the coolest November.
How fall really feels in Long Mỹ
Once humidity and wind are folded in, fall brings about 91 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.
Long Mỹ 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 | 30° / 23° | 27 | 4.8 | 11.5 | 5.5 |
| Feb | 31° / 23° | 13 | 2.7 | 11.7 | 5.1 |
| Mar | 33° / 25° | 44 | 6.6 | 11.9 | 3.8 |
| Apr | 34° / 26° | 97 | 13.6 | 12.2 | 2.8 |
| May | 33° / 26° | 231 | 26.4 | 12.4 | 2.2 |
| Jun | 31° / 25° | 259 | 27.6 | 12.6 | 2.4 |
| Jul | 31° / 25° | 266 | 29.3 | 12.5 | 2.5 |
| Aug | 31° / 25° | 259 | 29.2 | 12.3 | 2.5 |
| Sep | 31° / 25° | 296 | 28.7 | 12.1 | 2.4 |
| Oct | 31° / 24° | 323 | 28 | 11.8 | 2.6 |
| Nov | 31° / 24° | 165 | 19 | 11.6 | 3.5 |
| Dec | 30° / 23° | 81 | 10.4 | 11.4 | 4.8 |
Cloud cover in Fall
The sky is clear or mostly clear about 5% of the time across fall.
Chance of precipitation in Fall
Long Mỹ gets around 784 mm of rain over 76 wet days across fall. The line is the day-by-day chance of measurable precipitation.
Humidity in Fall
Most of fall feels miserable — 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 12 min in early September to 11 h 30 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 4.2 kWh/m².
Hazard calendar for Long Mỹ
In fall, Long Mỹ overlaps its pacific typhoon and rainy season season. The full year is below, with each hazard's peak months called out.
Long Mỹ sits in the Pacific typhoon belt; the season peaks July–October.
Long Mỹ's rainy season runs May–November, when most of the year's rain falls.
Is fall a good time to visit Long Mỹ?
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 weaker month for outdoor sightseeing in Long Mỹ.
What to pack for Long Mỹ in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, Long Mỹ sees daytime highs around 31°C and nights near 24°C. Pack light clothes and rain gear. About 76 days see rain.
Sea temperature near Long Mỹ in Fall
The nearest coast averages about 29°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 62 km away) is warmest in May at about 30°C and coldest in January near 26°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) | 26 | 26 | 28 | 29 | 30 | 30 | 29 | 29 | 29 | 29 | 28 | 27 |
| Comfort | Warm | Warm | Warm | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Warm |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 26 | Warm |
| Feb | 26 | Warm |
| Mar | 28 | Warm |
| Apr | 29 | Tropical |
| May | 30 | Tropical |
| Jun | 30 | Tropical |
| Jul | 29 | Tropical |
| Aug | 29 | Tropical |
| Sep | 29 | Tropical |
| Oct | 29 | Tropical |
| Nov | 28 | Tropical |
| Dec | 27 | Warm |
UV index in Long Mỹ in Fall
Clear-sky midday UV across fall averages around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Long Mỹ peaks around March 22 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 at about 10 (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 | 12 | 13 | 13 | 13 | 12 | 12 | 13 | 13 | 10 | 10 | 10 |
| Level | Very high | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | Very high |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 10 | Very high |
| Feb | 12 | Extreme |
| Mar | 13 | Extreme |
| Apr | 13 | Extreme |
| May | 13 | Extreme |
| Jun | 12 | Extreme |
| Jul | 12 | Extreme |
| Aug | 13 | Extreme |
| Sep | 13 | Extreme |
| Oct | 10 | Extreme |
| Nov | 10 | Very high |
| Dec | 10 | Very high |
Air quality in Long Mỹ 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 Long Mỹ is worst in December — around 57 µg/m³ PM2.5 (unhealthy), about 2.1× the cleanest month (August, 27 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) | 51 | 40 | 38 | 39 | 37 | 32 | 30 | 27 | 35 | 49 | 53 | 57 |
| Level | Poor | Poor | Poor | Poor | Poor | Moderate | Moderate | Moderate | Poor | Poor | Poor | Unhealthy |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 51 | Poor |
| Feb | 40 | Poor |
| Mar | 38 | Poor |
| Apr | 39 | Poor |
| May | 37 | Poor |
| Jun | 32 | Moderate |
| Jul | 30 | Moderate |
| Aug | 27 | Moderate |
| Sep | 35 | Poor |
| Oct | 49 | Poor |
| Nov | 53 | Poor |
| Dec | 57 | Unhealthy |
Where is Long Mỹ?
Long Mỹ sits at 9.7°N, 105.6°E, 2 m above sea level, in Vietnam. The nearest listed city is Ngã Năm, 13 km away.
Topography around Long Mỹ
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Long Mỹ.
Within 3 km, the terrain around Long Mỹ has only modest variations in elevation — a maximum elevation change of 11 m around an average of 2 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 18 m; within 80 km, only modest variations in elevation — a maximum elevation change of 206 m.
The land around Long Mỹ is covered by cropland (66%) and trees (22%) within 3 km, cropland (74%) and trees (21%) within 16 km, and cropland (50%), water (25%) and trees (21%) 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 Long Mỹ (9.6814°, 105.5723°, elevation 2 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.