Ít Ong in Fall
In fall (September, October and November), Ít Ong sees average daytime highs around 26°C and overnight lows near 18°C, with 323 mm of rain over about 34 wet days across the season. It is the 3rd-warmest season and the 2nd-wettest season.
Over the season highs ease from about 28°C in early September to 23°C by late November. The sky is clear or mostly clear about 29% of the time across fall, and the air most often feels muggy.
Fall is Ít Ong's 2nd-best season to visit on our travel score. For the whole year in context, see Ít Ong's year-round climate.
- Avg daytime high
- 26°C
- 3rd-warmest season
- Avg overnight low
- 18°C
- Rainfall
- 323 mm
- 34 wet days
- Avg wind
- 4 km/h
- Travel score
- 6.4
- 2nd-best season
- Months
- Sep · Oct · Nov
Temperature in Ít Ong in Fall
Over the season highs ease from about 28°C in early September to 23°C by late November.
A typical fall day in Ít Ong reaches about 26°C and drops to 18°C overnight. The warmest of the three months is September, the coolest November.
Ít Ong 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 | 20° / 12° | 26 | 3.8 | 10.8 | 7.4 |
| Feb | 23° / 13° | 16 | 3.2 | 11.3 | 8.1 |
| Mar | 26° / 16° | 26 | 5 | 11.8 | 7.8 |
| Apr | 28° / 19° | 35 | 8 | 12.5 | 6.3 |
| May | 29° / 21° | 109 | 16.5 | 13 | 4.5 |
| Jun | 28° / 22° | 244 | 23.8 | 13.3 | 3.6 |
| Jul | 28° / 22° | 397 | 25.6 | 13.2 | 3.8 |
| Aug | 28° / 22° | 428 | 26.2 | 12.7 | 3.7 |
| Sep | 28° / 21° | 235 | 20.8 | 12.1 | 4.5 |
| Oct | 26° / 19° | 61 | 9.4 | 11.5 | 6.7 |
| Nov | 24° / 16° | 28 | 3.7 | 11 | 8.1 |
| Dec | 21° / 12° | 23 | 3.5 | 10.7 | 7.7 |
Cloud cover in Fall
The sky is clear or mostly clear about 29% of the time across fall.
Chance of precipitation in Fall
Ít Ong gets around 323 mm of rain over 34 wet days across fall. The line is the day-by-day chance of measurable precipitation.
Humidity in Fall
Most of fall feels muggy — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Fall
Winds average 4 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 3.9 kWh/m².
Hazard calendar for Ít Ong
In fall, Ít Ong overlaps its monsoon season. The full year is below, with each hazard's peak months called out.
Ít Ong's monsoon runs June–September, when most of the year's rain falls.
Is fall a good time to visit Ít Ong?
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 Ít Ong for sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Ít Ong in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, Ít Ong sees daytime highs around 26°C and nights near 18°C. Pack light clothes and rain gear. About 34 days see rain.
UV index in Ít Ong in Fall
Clear-sky midday UV across fall averages around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Ít Ong peaks around June 20 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 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 | 9 | 12 | 10 | 11 | 14 | 13 | 13 | 9 | 9 | 8 | 6 |
| Level | High | Very high | Extreme | Very high | Extreme | Extreme | Extreme | Extreme | Very high | Very high | Very high | High |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 7 | High |
| Feb | 9 | Very high |
| Mar | 12 | Extreme |
| Apr | 10 | Very high |
| May | 11 | Extreme |
| Jun | 14 | Extreme |
| Jul | 13 | Extreme |
| Aug | 13 | Extreme |
| Sep | 9 | Very high |
| Oct | 9 | Very high |
| Nov | 8 | Very high |
| Dec | 6 | High |
Air quality in Ít Ong 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 Ít Ong is worst in April — around 70 µg/m³ PM2.5 (unhealthy), about 4.5× 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) | 43 | 48 | 64 | 70 | 34 | 18 | 16 | 17 | 23 | 30 | 37 | 42 |
| Level | Poor | Poor | Unhealthy | Unhealthy | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Poor | Poor |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 43 | Poor |
| Feb | 48 | Poor |
| Mar | 64 | Unhealthy |
| Apr | 70 | Unhealthy |
| May | 34 | Moderate |
| Jun | 18 | Moderate |
| Jul | 16 | Moderate |
| Aug | 17 | Moderate |
| Sep | 23 | Moderate |
| Oct | 30 | Moderate |
| Nov | 37 | Poor |
| Dec | 42 | Poor |
Where is Ít Ong?
Ít Ong sits at 21.5°N, 104.0°E, 206 m above sea level, in Vietnam. The nearest listed city is Sơn La, 24 km away.
Topography around Ít Ong
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Ít Ong.
Within 3 km, the terrain around Ít Ong has large variations in elevation — a maximum elevation change of 913 m around an average of 362 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 2,314 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,884 m.
The land around Ít Ong is covered by trees (52%) and grassland (33%) within 3 km, trees (64%) and grassland (27%) within 16 km, and trees (72%) and grassland (23%) 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 Ít Ong (21.5175°, 104.027°, elevation 206 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.