Diễn Thành in Summer
In summer (June, July and August), Diễn Thành sees average daytime highs around 34°C and overnight lows near 27°C, with 546 mm of rain over about 47 wet days across the season. It is the warmest season of the year and the 2nd-wettest season.
Over the season highs ease from about 35°C in early June to 32°C by late August. The sky is clear or mostly clear about 9% of the time across summer, and the air most often feels miserable.
Summer is Diễn Thành's weakest season of the year to visit on our travel score. For the whole year in context, see Diễn Thành's year-round climate.
- Avg daytime high
- 34°C
- warmest season of the year
- Avg overnight low
- 27°C
- Rainfall
- 546 mm
- 47 wet days
- Avg wind
- 9 km/h
- Travel score
- 2.3
- weakest season of the year
- Months
- Jun · Jul · Aug
Temperature in Diễn Thành in Summer
Over the season highs ease from about 35°C in early June to 32°C by late August.
A typical summer day in Diễn Thành reaches about 34°C and drops to 27°C overnight. The warmest of the three months is June, the coolest August.
How summer really feels in Diễn Thành
Once humidity and wind are folded in, summer brings about 92 days that feel above 32°C and 0 that feel at or below 0°C.
The story in summer is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Diễn Thành weather by month
How the three summer months (June, July and August) 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 | 21° / 16° | 17 | 3.9 | 11 | 7.0 |
| Feb | 23° / 17° | 13 | 3.3 | 11.4 | 7.4 |
| Mar | 26° / 19° | 31 | 5.3 | 11.9 | 7.2 |
| Apr | 30° / 23° | 49 | 6.9 | 12.4 | 5.3 |
| May | 33° / 26° | 115 | 14 | 12.9 | 3.1 |
| Jun | 35° / 28° | 116 | 12 | 13.1 | 2.1 |
| Jul | 34° / 28° | 171 | 14.2 | 13 | 2.3 |
| Aug | 33° / 27° | 259 | 20.5 | 12.6 | 2.6 |
| Sep | 31° / 25° | 293 | 19.9 | 12.1 | 3.2 |
| Oct | 29° / 23° | 238 | 17.5 | 11.6 | 4.8 |
| Nov | 26° / 20° | 62 | 9.1 | 11.1 | 6.7 |
| Dec | 22° / 17° | 26 | 5.1 | 10.9 | 7.2 |
Cloud cover in Summer
The sky is clear or mostly clear about 9% of the time across summer.
Chance of precipitation in Summer
Diễn Thành gets around 546 mm of rain over 47 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels miserable — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 9 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 13 h 06 min in early June to 12 h 24 min by late August. The lit band spans sunrise to sunset each day.
Solar energy in Summer
Average shortwave solar energy reaching the ground each day across summer, about 5.4 kWh/m².
Hazard calendar for Diễn Thành
In summer, Diễn Thành overlaps its pacific typhoon and monsoon season. The full year is below, with each hazard's peak months called out.
Diễn Thành sits in the Pacific typhoon belt; the season peaks July–October.
Diễn Thành's monsoon runs July–October, when most of the year's rain falls.
Is summer a good time to visit Diễn Thành?
Our two travel scores rate summer for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
summer is a weaker month for outdoor sightseeing in Diễn Thành.
What to pack for Diễn Thành in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Diễn Thành sees daytime highs around 34°C and nights near 27°C. Pack light clothes and rain gear. Worth having: sun protection. About 47 days see rain.
Sea temperature near Diễn Thành in Summer
The nearest coast averages about 30°C across summer — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea offshore is warmest in August at about 30°C and coldest in February near 21°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) | 21 | 21 | 22 | 24 | 28 | 30 | 30 | 30 | 30 | 28 | 26 | 23 |
| Comfort | Refreshing | Refreshing | Refreshing | Warm | Warm | Tropical | Tropical | Tropical | Tropical | Warm | Warm | Refreshing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 21 | Refreshing |
| Feb | 21 | Refreshing |
| Mar | 22 | Refreshing |
| Apr | 24 | Warm |
| May | 28 | Warm |
| Jun | 30 | Tropical |
| Jul | 30 | Tropical |
| Aug | 30 | Tropical |
| Sep | 30 | Tropical |
| Oct | 28 | Warm |
| Nov | 26 | Warm |
| Dec | 23 | Refreshing |
UV index in Diễn Thành in Summer
Clear-sky midday UV across summer averages around 12 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Diễn Thành peaks around July 17 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 14 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) | 8 | 9 | 10 | 9 | 11 | 12 | 12 | 12 | 11 | 10 | 7 | 6 |
| Level | Very high | Very high | Very high | Very high | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | High | High |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 8 | Very high |
| Feb | 9 | Very high |
| Mar | 10 | Very high |
| Apr | 9 | Very high |
| May | 11 | Extreme |
| Jun | 12 | Extreme |
| Jul | 12 | Extreme |
| Aug | 12 | Extreme |
| Sep | 11 | Extreme |
| Oct | 10 | Very high |
| Nov | 7 | High |
| Dec | 6 | High |
Air quality in Diễn Thành in Summer
Average fine-particle pollution (PM2.5) through the year — so you can see where summer falls, not just the annual average.
Air quality in Diễn Thành is worst in April — around 62 µg/m³ PM2.5 (unhealthy), about 3.5× the cleanest month (July, 18 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) | 52 | 52 | 57 | 62 | 35 | 20 | 18 | 21 | 30 | 41 | 47 | 52 |
| Level | Poor | Poor | Unhealthy | Unhealthy | Poor | Moderate | Moderate | Moderate | Moderate | Poor | Poor | Poor |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 52 | Poor |
| Feb | 52 | Poor |
| Mar | 57 | Unhealthy |
| Apr | 62 | Unhealthy |
| May | 35 | Poor |
| Jun | 20 | Moderate |
| Jul | 18 | Moderate |
| Aug | 21 | Moderate |
| Sep | 30 | Moderate |
| Oct | 41 | Poor |
| Nov | 47 | Poor |
| Dec | 52 | Poor |
Where is Diễn Thành?
Diễn Thành sits at 19.0°N, 105.6°E, 9 m above sea level, in Vietnam. The nearest listed city is Kim Liên, 32 km away.
Topography around Diễn Thành
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Diễn Thành.
Within 3 km, the terrain around Diễn Thành has only modest variations in elevation — a maximum elevation change of 12 m around an average of 3 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 430 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,711 m.
The land around Diễn Thành is covered by cropland (44%) and artificial surfaces (21%) within 3 km, water (35%), cropland (33%) and trees (20%) within 16 km, and trees (54%) and water (28%) 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 Diễn Thành (18.9765°, 105.6003°, elevation 9 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.