Ô Môn in Fall
In fall (September, October and November), Ô Môn sees average daytime highs around 31°C and overnight lows near 25°C, with 710 mm of rain over about 73 wet days across the season. It is the 2nd-warmest season and the 2nd-wettest season.
Across fall, daytime highs hold fairly steady around 31°C. The sky is clear or mostly clear about 6% of the time across fall, and the air most often feels miserable.
Fall is Ô Môn's 3rd-best season to visit on our travel score. For the whole year in context, see Ô Môn's year-round climate.
- Avg daytime high
- 31°C
- 2nd-warmest season
- Avg overnight low
- 25°C
- Rainfall
- 710 mm
- 73 wet days
- Avg wind
- 8 km/h
- Travel score
- 2.8
- 3rd-best season
- Months
- Sep · Oct · Nov
Temperature in Ô Môn in Fall
Across fall, daytime highs hold fairly steady around 31°C.
A typical fall day in Ô Môn reaches about 31°C and drops to 25°C overnight. The warmest of the three months is October, the coolest November.
How fall really feels in Ô Môn
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.
Ô Môn 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 | 4.4 | 11.5 | 5.5 |
| Feb | 31° / 23° | 13 | 2.3 | 11.7 | 5.0 |
| Mar | 33° / 25° | 39 | 5.9 | 11.9 | 3.7 |
| Apr | 34° / 26° | 85 | 12.5 | 12.2 | 2.8 |
| May | 33° / 26° | 207 | 25.5 | 12.5 | 2.2 |
| Jun | 31° / 25° | 245 | 27.3 | 12.6 | 2.4 |
| Jul | 31° / 25° | 254 | 28.3 | 12.5 | 2.6 |
| Aug | 31° / 25° | 248 | 28.7 | 12.3 | 2.5 |
| Sep | 31° / 25° | 275 | 28 | 12.1 | 2.4 |
| Oct | 31° / 25° | 293 | 27.6 | 11.8 | 2.5 |
| Nov | 31° / 24° | 142 | 17.7 | 11.5 | 3.5 |
| Dec | 30° / 23° | 68 | 9.3 | 11.4 | 4.8 |
Cloud cover in Fall
The sky is clear or mostly clear about 6% of the time across fall.
Chance of precipitation in Fall
Ô Môn gets around 710 mm of rain over 73 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 4.3 kWh/m².
Hazard calendar for Ô Môn
In fall, Ô Môn overlaps its rainy season season. The full year is below, with each hazard's peak months called out.
Ô Môn's rainy season runs May–November, when most of the year's rain falls.
Is fall a good time to visit Ô Môn?
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 Ô Môn.
What to pack for Ô Môn in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, Ô Môn sees daytime highs around 31°C and nights near 25°C. Pack light clothes and rain gear. About 73 days see rain.
UV index in Ô Môn in Fall
Clear-sky midday UV across fall averages around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Ô Môn peaks around September 9 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 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) | 9 | 12 | 13 | 12 | 12 | 11 | 12 | 13 | 13 | 9 | 9 | 9 |
| Level | Very high | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | Very high | Very high |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 9 | Very high |
| Feb | 12 | Extreme |
| Mar | 13 | Extreme |
| Apr | 12 | Extreme |
| May | 12 | Extreme |
| Jun | 11 | Extreme |
| Jul | 12 | Extreme |
| Aug | 13 | Extreme |
| Sep | 13 | Extreme |
| Oct | 9 | Very high |
| Nov | 9 | Very high |
| Dec | 9 | Very high |
Air quality in Ô Môn 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 Ô Môn 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 Ô Môn?
Ô Môn sits at 10.1°N, 105.6°E, 5 m above sea level, in Vietnam. The nearest listed city is Thới Lai, 9.0 km away.
Topography around Ô Môn
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Ô Môn.
Within 3 km, the terrain around Ô Môn has only modest variations in elevation — a maximum elevation change of 13 m around an average of 3 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 18 m; within 80 km, significant variations in elevation — a maximum elevation change of 589 m.
The land around Ô Môn is covered by cropland (53%) and trees (30%) within 3 km, cropland (47%) and trees (37%) within 16 km, and cropland (63%) and trees (27%) 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 Ô Môn (10.1097°, 105.6232°, elevation 5 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.