Long Diền in Fall
In fall (September, October and November), Long Diền sees average daytime highs around 30°C and overnight lows near 25°C, with 669 mm of rain over about 69 wet days across the season. It is the 3rd-warmest season and the 2nd-wettest season.
Across fall, daytime highs hold fairly steady around 30°C. The sky is clear or mostly clear about 11% of the time across fall, and the air most often feels miserable.
Fall is Long Diền's 3rd-best season to visit on our travel score. Long Diền has little temperature swing across the year, so its calendar seasons blur — the season framing matters less here than for a place with four distinct seasons. For the whole year in context, see Long Diền's year-round climate.
- Avg daytime high
- 30°C
- 3rd-warmest season
- Avg overnight low
- 25°C
- Rainfall
- 669 mm
- 69 wet days
- Avg wind
- 10 km/h
- Travel score
- 3.4
- 3rd-best season
- Months
- Sep · Oct · Nov
Temperature in Long Diền in Fall
Across fall, daytime highs hold fairly steady around 30°C.
A typical fall day in Long Diền reaches about 30°C and drops to 25°C overnight. The warmest of the three months is September, the coolest November.
How fall really feels in Long Diền
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 Diền 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 | 29° / 24° | 22 | 2.8 | 11.5 | 6.2 |
| Feb | 30° / 24° | 7 | 0.9 | 11.7 | 6.2 |
| Mar | 31° / 25° | 15 | 2.7 | 11.9 | 5.4 |
| Apr | 32° / 27° | 49 | 8.9 | 12.2 | 4.2 |
| May | 32° / 27° | 188 | 24 | 12.5 | 2.8 |
| Jun | 31° / 26° | 251 | 27.4 | 12.6 | 2.6 |
| Jul | 30° / 26° | 253 | 28.8 | 12.6 | 2.7 |
| Aug | 30° / 26° | 256 | 28.7 | 12.3 | 2.7 |
| Sep | 30° / 25° | 289 | 28.1 | 12.1 | 2.7 |
| Oct | 30° / 25° | 254 | 26.4 | 11.8 | 3.1 |
| Nov | 30° / 25° | 126 | 14.9 | 11.5 | 4.4 |
| Dec | 29° / 24° | 66 | 9 | 11.4 | 5.3 |
Cloud cover in Fall
The sky is clear or mostly clear about 11% of the time across fall.
Chance of precipitation in Fall
Long Diền gets around 669 mm of rain over 69 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 10 km/h across fall.
Sunrise & sunset in Fall
Daylight runs from about 12 h 12 min in early September to 11 h 24 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 4.9 kWh/m².
Hazard calendar for Long Diền
In fall, Long Diền overlaps its pacific typhoon and rainy season season. The full year is below, with each hazard's peak months called out.
Long Diền sits in the Pacific typhoon belt; the season peaks July–October.
Long Diền's rainy season runs May–October, when most of the year's rain falls.
Is fall a good time to visit Long Diền?
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 Diền.
What to pack for Long Diền in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, Long Diền sees daytime highs around 30°C and nights near 25°C. Pack light clothes and rain gear. Worth having: sun protection. About 69 days see rain.
Sea temperature near Long Diền in Fall
The nearest coast averages about 28°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 16 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 | 27 | 29 | 30 | 29 | 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 | 27 | Warm |
| Apr | 29 | Tropical |
| May | 30 | Tropical |
| Jun | 29 | Tropical |
| Jul | 29 | Tropical |
| Aug | 29 | Tropical |
| Sep | 29 | Tropical |
| Oct | 29 | Tropical |
| Nov | 28 | Tropical |
| Dec | 27 | Warm |
UV index in Long Diền 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 Diền peaks around March 23 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near November 21 at about 9 (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) | 11 | 12 | 13 | 13 | 13 | 11 | 12 | 13 | 13 | 10 | 9 | 9 |
| Level | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | Very high |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 11 | Extreme |
| Feb | 12 | Extreme |
| Mar | 13 | Extreme |
| Apr | 13 | Extreme |
| May | 13 | Extreme |
| Jun | 11 | Extreme |
| Jul | 12 | Extreme |
| Aug | 13 | Extreme |
| Sep | 13 | Extreme |
| Oct | 10 | Extreme |
| Nov | 9 | Very high |
| Dec | 9 | Very high |
Air quality in Long Diền 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 Diền is worst in October — around 34 µg/m³ PM2.5 (moderate), about 1.6× the cleanest month (March, 21 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) | 26 | 21 | 21 | 21 | 25 | 30 | 29 | 29 | 33 | 34 | 31 | 34 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 26 | Moderate |
| Feb | 21 | Moderate |
| Mar | 21 | Moderate |
| Apr | 21 | Moderate |
| May | 25 | Moderate |
| Jun | 30 | Moderate |
| Jul | 29 | Moderate |
| Aug | 29 | Moderate |
| Sep | 33 | Moderate |
| Oct | 34 | Moderate |
| Nov | 31 | Moderate |
| Dec | 34 | Moderate |
Where is Long Diền?
Long Diền sits at 10.5°N, 107.2°E, 17 m above sea level, in Vietnam. The nearest listed city is Thành Phố Bà Rịa, 5.0 km away.
Topography around Long Diền
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Long Diền.
Within 3 km, the terrain around Long Diền has only modest variations in elevation — a maximum elevation change of 66 m around an average of 9 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 515 m; within 80 km, large variations in elevation — a maximum elevation change of 918 m.
The land around Long Diền is covered by cropland (34%) and artificial surfaces (25%) within 3 km, water (29%) and trees (28%) within 16 km, and water (40%) and trees (33%) 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 Diền (10.4833°, 107.2167°, elevation 17 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.