Kiên Hải in Fall
In fall (September, October and November), Kiên Hải sees average daytime highs around 28°C and overnight lows near 26°C, with 815 mm of rain over about 71 wet days across the season. It is the coldest season of the year and the 2nd-wettest season.
Across fall, daytime highs hold fairly steady around 28°C. The sky is clear or mostly clear about 9% of the time across fall, and the air most often feels miserable.
Fall is Kiên Hải's 3rd-best season to visit on our travel score. Kiên Hải 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 Kiên Hải's year-round climate.
- Avg daytime high
- 28°C
- coldest season of the year
- Avg overnight low
- 26°C
- Rainfall
- 815 mm
- 71 wet days
- Avg wind
- 16 km/h
- Travel score
- 3.9
- 3rd-best season
- Months
- Sep · Oct · Nov
Temperature in Kiên Hải in Fall
Across fall, daytime highs hold fairly steady around 28°C.
A typical fall day in Kiên Hải reaches about 28°C and drops to 26°C overnight. The warmest of the three months is November, the coolest November.
How fall really feels in Kiên Hải
Once humidity and wind are folded in, fall brings about 88 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.
Kiên Hải 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 | 28° / 25° | 21 | 4.7 | 11.5 | 6.8 |
| Feb | 29° / 25° | 13 | 3 | 11.7 | 6.6 |
| Mar | 30° / 26° | 38 | 7.2 | 11.9 | 5.7 |
| Apr | 30° / 27° | 92 | 15.6 | 12.2 | 4.4 |
| May | 29° / 27° | 267 | 26.5 | 12.5 | 3.2 |
| Jun | 29° / 27° | 346 | 26.8 | 12.6 | 3.2 |
| Jul | 28° / 27° | 373 | 28 | 12.5 | 3.3 |
| Aug | 28° / 26° | 350 | 27.7 | 12.3 | 3.4 |
| Sep | 28° / 26° | 380 | 26.9 | 12.1 | 3.5 |
| Oct | 28° / 26° | 316 | 27.5 | 11.8 | 3.5 |
| Nov | 29° / 26° | 119 | 16.8 | 11.5 | 4.6 |
| Dec | 28° / 25° | 54 | 8.7 | 11.4 | 6.0 |
Cloud cover in Fall
The sky is clear or mostly clear about 9% of the time across fall.
Chance of precipitation in Fall
Kiên Hải gets around 815 mm of rain over 71 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 16 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 4.5 kWh/m².
Hazard calendar for Kiên Hải
In fall, Kiên Hải overlaps its pacific typhoon and monsoon season. The full year is below, with each hazard's peak months called out.
Kiên Hải sits in the Pacific typhoon belt; the season peaks July–October.
Kiên Hải's monsoon runs May–October, when most of the year's rain falls.
Is fall a good time to visit Kiên Hải?
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 Kiên Hải.
What to pack for Kiên Hải in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, Kiên Hải sees daytime highs around 28°C and nights near 26°C. Pack light clothes and rain gear. Worth having: sun protection and a windbreaker. About 71 days see rain.
Sea temperature near Kiên Hải 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 offshore is warmest in May at about 31°C and coldest in January near 27°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) | 27 | 28 | 29 | 30 | 31 | 30 | 29 | 29 | 29 | 29 | 29 | 28 |
| Comfort | Warm | Warm | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Warm |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 27 | Warm |
| Feb | 28 | Warm |
| Mar | 29 | Tropical |
| Apr | 30 | Tropical |
| May | 31 | Tropical |
| Jun | 30 | Tropical |
| Jul | 29 | Tropical |
| Aug | 29 | Tropical |
| Sep | 29 | Tropical |
| Oct | 29 | Tropical |
| Nov | 29 | Tropical |
| Dec | 28 | Warm |
UV index in Kiên Hải 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 Kiên Hải peaks around August 20 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 14 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) | 10 | 11 | 12 | 12 | 11 | 12 | 12 | 13 | 13 | 10 | 9 | 9 |
| Level | Very high | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | Very high | Very high |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 10 | Very high |
| Feb | 11 | Extreme |
| Mar | 12 | Extreme |
| Apr | 12 | Extreme |
| May | 11 | Extreme |
| Jun | 12 | Extreme |
| Jul | 12 | Extreme |
| Aug | 13 | Extreme |
| Sep | 13 | Extreme |
| Oct | 10 | Very high |
| Nov | 9 | Very high |
| Dec | 9 | Very high |
Air quality in Kiên Hải 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 Kiên Hải is worst in January — around 45 µg/m³ PM2.5 (poor), about 2.4× the cleanest month (August, 19 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) | 45 | 37 | 33 | 32 | 27 | 22 | 22 | 19 | 23 | 32 | 42 | 45 |
| Level | Poor | Poor | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Poor | Poor |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 45 | Poor |
| Feb | 37 | Poor |
| Mar | 33 | Moderate |
| Apr | 32 | Moderate |
| May | 27 | Moderate |
| Jun | 22 | Moderate |
| Jul | 22 | Moderate |
| Aug | 19 | Moderate |
| Sep | 23 | Moderate |
| Oct | 32 | Moderate |
| Nov | 42 | Poor |
| Dec | 45 | Poor |
Where is Kiên Hải?
Kiên Hải sits at 10.0°N, 104.8°E, 18 m above sea level, in Vietnam. The nearest listed city is Rạch Giá, 26 km away.
Topography around Kiên Hải
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Kiên Hải.
Within 3 km, the terrain around Kiên Hải has significant variations in elevation — a maximum elevation change of 400 m around an average of 18 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 400 m; within 80 km, large variations in elevation — a maximum elevation change of 691 m.
The land around Kiên Hải is covered by water (85%) within 3 km, water (98%) within 16 km, and water (48%) and cropland (41%) 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 Kiên Hải (9.9727°, 104.8475°, elevation 18 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.