Cổ Đô weather in April

In April, Cổ Đô sees average daytime highs of 29°C and overnight lows near 22°C, with 103 mm of rain across 12.2 wet days and about 12.5 hours of daylight. It is the 6th-warmest and 7th-wettest month of the year here.

Highs climb over the month, from about 26°C in the first days to 30°C by the end. The sky is clear or mostly clear about 12% 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 48 min by month's end. Set against the rest of the year, April is Cổ Đô's 5th-clearest and 1st-windiest month. For the whole year in context, see Cổ Đô's year-round climate.

Daytime high
29°
6th warmest
Overnight low
22°
6th coldest
Rainfall
103 mm
12.2 wet days
Daylight
12 h 30 min
5:44 AM – 6:13 PM
Cloud cover
72%
5th clearest
Wind
6 km/h
1st windiest
Solar energy
4 kWh/m²
Travel score
5.2
out of 10

Temperature in April

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 26°C in the first days to 30°C by the end.

A typical April day in Cổ Đô reaches about 29°C in the afternoon and slips back to 22°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 23°C and 33°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°151015202530
Avg high (°C)Avg low (°C)
12620
22620
32620
42720
52720
62720
72721
82721
92821
102821
112821
122821
132821
142822
152922
162922
172922
182922
192922
202922
212922
223023
233023
243023
253023
263023
273023
283023
293023
303023

How April really feels in Cổ Đô

Once humidity and wind are folded in, April averages 13 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
13
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.

Cổ Đô weather by month

How April compares with the rest of the year at a glance. April is the 6th-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan19° / 14°459.110.86.0
Feb21° / 15°348.511.36.3
Mar24° / 18°6111.611.86.3
Apr29° / 22°10312.212.55.2
May31° / 25°23017.9133.4
Jun33° / 26°23819.113.32.6
Jul33° / 26°29120.913.22.6
Aug32° / 26°35422.512.72.7
Sep31° / 25°23018.812.13.5
Oct29° / 22°11911.611.55.6
Nov25° / 19°587.5117.1
Dec21° / 15°387.610.76.8

Cloud cover in April

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 12% of the time in April.

Beyond those clear spells, partly cloudy skies cover about 19% of April, with mostly cloudy or overcast conditions the remaining 68%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
12674
22674
32674
42872
52872
62971
72971
82971
93070
103070
113169
123268
133169
143268
153367
163466
173466
183466
193466
203466
213466
223466
233466
243367
253466
263565
273565
283466
293466
303367

Chance of precipitation in April

Any precipitation

Cổ Đô gets around 103 mm of rain over 12.2 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 41% and peaks near 46% on the wettest days.

0%20%40%60%151015202530
Rain chance (%)
141
241
341
441
541
641
740
840
939
1039
1139
1238
1338
1438
1538
1638
1738
1839
1939
2040
2140
2241
2341
2442
2543
2643
2744
2845
2945
3046

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 40% of days. Sticky, muggy-or-worse air turns up on roughly 83% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1481933333
2381833334
3371832345
4371732356
5361731368
6261630379
72616283710
82616273811
92615263912
102515254014
111515234015
121514224117
131513214118
141513204120
151412194222
161412194223
170412184224
180311184225
190311184226
200310184327
21029184327
22028184428
23028174429
24017174430
25016174431
26016174432
27016174333
28015174334
29005174236
30005174237

Wind in April

Winds average 6 km/h in April, the windiest month of the year.

Across April, daily wind ranges from about 6 km/h on the calmest days to 6 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm

Sunrise & sunset in April

DaylightNight

Daylight runs from about 12 h 12 min at the start of April to 12 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 36 minutes over April. Sunrise moves from 5:58 AM to 5:33 AM, and sunset from 6:09 PM to 6:18 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.25:586:09
212.25:576:09
312.25:566:09
412.25:556:10
512.35:546:10
612.35:536:10
712.35:526:11
812.35:516:11
912.35:506:11
1012.45:496:11
1112.45:486:12
1212.45:486:12
1312.45:476:12
1412.45:466:13
1512.55:456:13
1612.55:446:13
1712.55:436:14
1812.55:426:14
1912.55:426:14
2012.65:416:15
2112.65:406:15
2212.65:396:15
2312.65:386:16
2412.65:386:16
2512.75:376:17
2612.75:366:17
2712.75:356:17
2812.75:356:18
2912.75:346:18
3012.85:336:18

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 4 kWh/m².

For context, solar energy here swings from a low near 2.16 kWh/m² to a high of 4.77 kWh/m² in June across the year — April's 4 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
13.4Moderate
23.4Moderate
33.5Moderate
43.5Moderate
53.5Moderate
63.6Moderate
73.6Moderate
83.7Moderate
93.7Moderate
103.8Moderate
113.8Moderate
123.9Moderate
133.9Moderate
144.0Moderate
154.0Bright
164.1Bright
174.1Bright
184.2Bright
194.2Bright
204.2Bright
214.3Bright
224.3Bright
234.3Bright
244.4Bright
254.4Bright
264.4Bright
274.5Bright
284.5Bright
294.5Bright
304.5Bright
Planning a trip in April

Hazard calendar for Cổ Đô

In seasonPeak

In April, Cổ Đô sits inside its pacific typhoon season. The full year is below, with each hazard's peak months called out.

Cổ Đô sits in the Pacific typhoon belt; the season peaks July–October.

Cổ Đô's monsoon runs May–September, 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 Cổ Đô?

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

5.2
Sightseeing
7th-best month of the year
6.2
Beach & pool
3rd-best month of the year

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

What to pack for Cổ Đô in April

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

In April, Cổ Đô sees daytime highs around 29°C and nights near 22°C. Pack light clothes. Worth having: rain gear. About 12 days see rain.

light clothesrain gear

UV index in Cổ Đô in April

LowModerateHighVery highExtreme

Clear-sky midday UV in April peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Cổ Đô peaks around June 20 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near November 20 at about 5 (high).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecHighVery highHighVery highExtremeHighJun 20UV 12Nov 20UV 5
UV index (midday)Level
Jan6High
Feb7High
Mar8Very high
Apr6High
May8Very high
Jun12Extreme
Jul11Extreme
Aug11Extreme
Sep6High
Oct7Very high
Nov5High
Dec6High

Air quality in Cổ Đô 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 Cổ Đô is worst in April — around 98 µg/m³ PM2.5 (unhealthy), about 3.8× the cleanest month (July, 26 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0306090120JanFebMarAprMayJunJulAugSepOctNovDecUnhealthyPoorModeratePoorUnhealthyApr 1494 µg/m³Jul 2026 µg/m³
PM2.5 (µg/m³)Level
Jan76Unhealthy
Feb71Unhealthy
Mar76Unhealthy
Apr98Unhealthy
May57Unhealthy
Jun32Moderate
Jul26Moderate
Aug28Moderate
Sep39Poor
Oct53Poor
Nov66Unhealthy
Dec77Unhealthy
Location & terrain

Where is Cổ Đô?

Cổ Đô sits at 21.3°N, 105.4°E, 17 m above sea level, in Vietnam. The nearest listed city is Việt Trì, 6.0 km away.

Topography around Cổ Đô

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Cổ Đô.

Within 3 km, the terrain around Cổ Đô has only modest variations in elevation — a maximum elevation change of 22 m around an average of 13 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 333 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,211 m.

The land around Cổ Đô is covered by cropland (39%) within 3 km, trees (42%) and cropland (33%) within 16 km, and trees (72%) within 80 km.

3 km
22 m
16 km
333 m
80 km
2,211 m
treesgrasslandcroplandartificial surfacesbare terrainwater
April weather nearby: Việt Trì 6.0 km · Phú Thọ 20 km · Sơn Tây 21 km · Ba Vì 22 km · Vĩnh Yên 25 km · Phúc Yên 36 km · Đan Phượng 37 km · Thượng Cát 43 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 Cổ Đô (21.2796°, 105.364°, elevation 17 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). 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).