Diễn Thành weather in April

In April, Diễn Thành sees average daytime highs of 30°C and overnight lows near 23°C, with 49 mm of rain across 6.9 wet days and about 12.4 hours of daylight. It is the 6th-warmest and 8th-wettest month of the year here.

Highs climb over the month, from about 28°C in the first days to 31°C by the end. The sky is clear or mostly clear about 23% of the time in April, and the air most often feels oppressive.

Daylight stretches from about 12 h 12 min at the start of April to 12 h 42 min by month's end. Set against the rest of the year, April is Diễn Thành's 3rd-clearest and 9th-windiest month. For the whole year in context, see Diễn Thành's year-round climate.

Daytime high
30°
6th warmest
Overnight low
23°
6th coldest
Rainfall
49 mm
6.9 wet days
Daylight
12 h 24 min
5:45 AM – 6:11 PM
Cloud cover
66%
3rd clearest
Wind
8 km/h
9th windiest
Solar energy
5.04 kWh/m²
Travel score
5.3
out of 10

Temperature in April

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 28°C in the first days to 31°C by the end.

A typical April day in Diễn Thành reaches about 30°C in the afternoon and slips back to 23°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 25°C and 35°C. Set against its neighbours, April runs about 4°C warmer than March and about 3°C cooler than May.

15°20°25°30°35°40°151015202530
Avg high (°C)Avg low (°C)
12821
22821
32821
42821
52822
62822
72922
82922
92922
102922
112922
122922
133022
143023
153023
163023
173023
183023
193023
203123
213123
223123
233124
243124
253124
263124
273124
283124
293224
303224

How April really feels in Diễn Thành

Once humidity and wind are folded in, April averages 20 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
20
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

The story in April is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Diễn Thành weather by month

How April compares with the rest of the year at a glance. April is the 6th-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan21° / 16°173.9117.0
Feb23° / 17°133.311.47.4
Mar26° / 19°315.311.97.2
Apr30° / 23°496.912.45.3
May33° / 26°1151412.93.1
Jun35° / 28°1161213.12.1
Jul34° / 28°17114.2132.3
Aug33° / 27°25920.512.62.6
Sep31° / 25°29319.912.13.2
Oct29° / 23°23817.511.64.8
Nov26° / 20°629.111.16.7
Dec22° / 17°265.110.97.2

Cloud cover in April

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 23% of the time in April.

Beyond those clear spells, partly cloudy skies cover about 14% of April, with mostly cloudy or overcast conditions the remaining 63%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13169
23268
33367
43466
53367
63565
73565
83664
93664
103664
113763
123763
133862
143961
154060
163961
174060
183961
193961
203961
213961
223862
233862
243862
253961
263862
273862
283862
293862
303664

Chance of precipitation in April

Any precipitation

Diễn Thành gets around 49 mm of rain over 6.9 wet days in April. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 24% and peaks near 35% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
119
219
319
419
519
619
719
819
919
1019
1120
1220
1320
1421
1521
1622
1723
1823
1924
2025
2126
2227
2328
2429
2530
2631
2732
2833
2934
3035

Humidity in April

DryComfortableHumidMuggyOppressiveMiserable

Most of April feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, April lands in the oppressive band about 43% of days. Sticky, muggy-or-worse air turns up on roughly 89% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
13511254510
22511254611
32410254612
42410244613
52410234615
61410234616
71410224617
81410224519
9149214520
10149204422
11139204423
12039194425
13038184327
14038174328
15038164330
16028154332
17027144333
18027144235
19027134236
20017134237
21016124238
22016124239
23015114241
24005104242
25005104243
26004104144
2700494145
2800494046
2900394047
3000393949

Wind in April

Winds average 8 km/h in April.

Across April, daily wind ranges from about 8 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
148calm
158calm
168calm
178calm
188calm
198calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
308calm

Sunrise & sunset in April

DaylightNight

Daylight runs from about 12 h 12 min at the start of April to 12 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 30 minutes over April. Sunrise moves from 5:57 AM to 5:35 AM, and sunset from 6:07 PM to 6:15 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.25:576:07
212.25:576:07
312.25:566:08
412.25:556:08
512.25:546:08
612.35:536:08
712.35:526:09
812.35:516:09
912.35:516:09
1012.35:506:09
1112.35:496:09
1212.45:486:10
1312.45:476:10
1412.45:466:10
1512.45:466:10
1612.45:456:11
1712.45:446:11
1812.55:436:11
1912.55:436:12
2012.55:426:12
2112.55:416:12
2212.55:406:12
2312.65:406:13
2412.65:396:13
2512.65:386:13
2612.65:386:14
2712.65:376:14
2812.65:366:14
2912.65:366:15
3012.75:356:15

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 5.04 kWh/m².

For context, solar energy here swings from a low near 2.47 kWh/m² to a high of 5.73 kWh/m² in June across the year — April's 5.04 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
14.3Bright
24.4Bright
34.5Bright
44.5Bright
54.6Bright
64.6Bright
74.7Bright
84.7Bright
94.8Bright
104.8Bright
114.9Bright
125.0Bright
135.0Bright
145.1Bright
155.1Bright
165.2Bright
175.2Bright
185.2Bright
195.3Bright
205.3Bright
215.3Bright
225.3Bright
235.4Bright
245.4Bright
255.4Bright
265.4Bright
275.4Bright
285.5Bright
295.5Bright
305.5Bright
Planning a trip in April

Hazard calendar for Diễn Thành

In seasonPeak

In April, Diễn Thành sits inside its pacific typhoon 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.

Pacific typhoon
Monsoon
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is April a good time to visit Diễn Thành?

Our two travel scores rate April for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

5.3
Sightseeing
6th-best month of the year
7.0
Beach & pool
1st-best month of the year

April is a reasonable time to visit Diễn Thành for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Diễn Thành in April

From April's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In April, Diễn Thành sees daytime highs around 30°C and nights near 23°C. Pack light clothes. Worth having: sun protection. About 7 days see rain.

light clothessun protection

Sea temperature near Diễn Thành in April

The nearest coast averages about 24°C in April — 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.

20°25°30°JanFebMarAprMayJunJulAugSepOctNovDeccoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan21Refreshing
Feb21Refreshing
Mar22Refreshing
Apr24Warm
May28Warm
Jun30Tropical
Jul30Tropical
Aug30Tropical
Sep30Tropical
Oct28Warm
Nov26Warm
Dec23Refreshing

UV index in Diễn Thành in April

LowModerateHighVery highExtreme

Clear-sky midday UV in April peaks 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 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highHighJul 17UV 12Dec 14UV 6
UV index (midday)Level
Jan8Very high
Feb9Very high
Mar10Very high
Apr9Very high
May11Extreme
Jun12Extreme
Jul12Extreme
Aug12Extreme
Sep11Extreme
Oct10Very high
Nov7High
Dec6High

Air quality in Diễn Thành in April

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where April 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).

020406080JanFebMarAprMayJunJulAugSepOctNovDecPoorUnhealthyPoorModeratePoorApr 1161 µg/m³Jul 1618 µg/m³
PM2.5 (µg/m³)Level
Jan52Poor
Feb52Poor
Mar57Unhealthy
Apr62Unhealthy
May35Poor
Jun20Moderate
Jul18Moderate
Aug21Moderate
Sep30Moderate
Oct41Poor
Nov47Poor
Dec52Poor
Location & terrain

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.

3 km
12 m
16 km
430 m
80 km
1,711 m
treesgrasslandcroplandartificial surfacesbare terrainwatermangroves
April weather nearby: Kim Liên 32 km · Hoàng Mai 35 km · Vinh 35 km · Yên Vinh 35 km · Bến Thủy 38 km · Nghi Xuân 39 km · Nghi Sơn 45 km · Hồng Lĩnh 51 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
none 86%Catholic 6%Buddhist 6%Protestant 1%

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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).