Viana do Castelo weather in April

In April, Viana do Castelo sees average daytime highs of 17°C and overnight lows near 10°C, with 154 mm of rain across 13 wet days and about 13.1 hours of daylight. It is the 7th-warmest and 6th-wettest month of the year here.

Day-to-day highs hold fairly steady near 17°C through the month. The sky is clear or mostly clear about 33% of the time in April, and the air most often feels dry.

Daylight stretches from about 12 h 24 min at the start of April to 13 h 42 min by month's end. Set against the rest of the year, April is Viana do Castelo's 6th-clearest and 5th-windiest month. For the whole year in context, see Viana do Castelo's year-round climate.

Daytime high: 17°; 7th warmest
Overnight low: 10°; 6th coldest
Rainfall: 154 mm; 13 wet days
Daylight: 13 h 06 min; 6:02 AM – 7:09 PM
Cloud cover: 55%; 6th clearest
Wind: 13 km/h; 5th windiest
Solar energy: 5.47 kWh/m²
Travel score: 5.0; out of 10

Viana do Castelo is city seat of Viana do Castelo municipality in northern Portugal and seat of the municipality and district of the same name.

Air quality: Excellent; PM10 9.1 µg/m³ · 2013

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

← March Viana do Castelo year-round climate May →Best places to visit in April

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

Temperature in April

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 17°C through the month.

A typical April day in Viana do Castelo reaches about 17°C in the afternoon and slips back to 10°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 13°C and 21°C. Set against its neighbours, April runs about 1°C warmer than March and about 2°C cooler than May.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Avg high (°C)	16	16	16	16	16	16	16	16	16	16	16	16	16	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17
Avg low (°C)	9	9	9	9	9	9	9	9	9	9	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10

	Avg high (°C)	Avg low (°C)
1	16	9
2	16	9
3	16	9
4	16	9
5	16	9
6	16	9
7	16	9
8	16	9
9	16	9
10	16	9
11	16	10
12	16	10
13	16	10
14	17	10
15	17	10
16	17	10
17	17	10
18	17	10
19	17	10
20	17	10
21	17	10
22	17	10
23	17	10
24	17	10
25	17	10
26	17	10
27	17	10
28	17	10
29	17	10
30	17	10

Viana do Castelo weather by month

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

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	13° / 7°	218	13.6	9.3	3.3
Feb	14° / 7°	142	10.4	10.3	3.9
Mar	15° / 8°	165	11.3	11.7	4.7
Apr	17° / 10°	154	13	13.1	5.0
May	19° / 12°	133	11.8	14.3	5.9
Jun	21° / 14°	56	6.9	15	7.2
Jul	23° / 16°	32	4.4	14.7	8.4
Aug	24° / 16°	45	5	13.7	8.3
Sep	22° / 15°	89	7.4	12.3	7.3
Oct	19° / 13°	232	13.2	10.9	5.7
Nov	15° / 10°	232	14.2	9.6	4.3
Dec	13° / 8°	227	14.1	9	3.5

Cloud cover in April

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 33% of the time in April.

Beyond those clear spells, partly cloudy skies cover about 17% of April, with mostly cloudy or overcast conditions the remaining 49%.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Clearer (%)	50	50	51	52	52	53	53	53	54	54	54	54	52	52	52	51	49	49	49	49	48	48	47	47	47	47	49	49	49	50
Cloudier (%)	50	50	49	48	48	47	47	47	46	46	46	46	48	48	48	49	51	51	51	51	52	52	53	53	53	53	51	51	51	50

	Clearer (%)	Cloudier (%)
1	50	50
2	50	50
3	51	49
4	52	48
5	52	48
6	53	47
7	53	47
8	53	47
9	54	46
10	54	46
11	54	46
12	54	46
13	52	48
14	52	48
15	52	48
16	51	49
17	49	51
18	49	51
19	49	51
20	49	51
21	48	52
22	48	52
23	47	53
24	47	53
25	47	53
26	47	53
27	49	51
28	49	51
29	49	51
30	50	50

Chance of precipitation in April

Any precipitation

Viana do Castelo gets around 154 mm of rain over 13 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 43% and peaks near 45% on the wettest days.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Rain chance (%)	43	43	43	43	42	42	41	41	41	41	41	41	42	42	42	43	43	44	44	45	45	45	45	45	45	44	44	43	42	42

	Rain chance (%)
1	43
2	43
3	43
4	43
5	42
6	42
7	41
8	41
9	41
10	41
11	41
12	41
13	42
14	42
15	42
16	43
17	43
18	44
19	44
20	45
21	45
22	45
23	45
24	45
25	45
26	44
27	44
28	43
29	42
30	42

Humidity in April

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, April lands in the dry band about 94% of days. It rarely turns muggy — the humid and sticky bands barely register.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Dry (%)	98	98	98	98	98	97	97	97	97	97	96	96	96	96	95	95	95	94	94	93	93	92	92	91	91	90	89	89	88	87
Comfortable (%)	2	2	2	2	2	3	3	3	3	3	4	4	4	4	5	5	5	6	6	7	7	8	8	9	9	10	11	11	12	13

	Dry (%)	Comfortable (%)
1	98	2
2	98	2
3	98	2
4	98	2
5	98	2
6	97	3
7	97	3
8	97	3
9	97	3
10	97	3
11	96	4
12	96	4
13	96	4
14	96	4
15	95	5
16	95	5
17	95	5
18	94	6
19	94	6
20	93	7
21	93	7
22	92	8
23	92	8
24	91	9
25	91	9
26	90	10
27	89	11
28	89	11
29	88	12
30	87	13

Wind in April

Winds average 13 km/h in April.

Across April, daily wind ranges from about 13 km/h on the calmest days to 14 km/h at its breeziest. It stays fairly steady from day to day.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Wind speed (km/h)	14	14	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13
Feels	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze

	Wind speed (km/h)	Feels
1	14	light breeze
2	14	light breeze
3	13	light breeze
4	13	light breeze
5	13	light breeze
6	13	light breeze
7	13	light breeze
8	13	light breeze
9	13	light breeze
10	13	light breeze
11	13	light breeze
12	13	light breeze
13	13	light breeze
14	13	light breeze
15	13	light breeze
16	13	light breeze
17	13	light breeze
18	13	light breeze
19	13	light breeze
20	13	light breeze
21	13	light breeze
22	13	light breeze
23	13	light breeze
24	13	light breeze
25	13	light breeze
26	13	light breeze
27	13	light breeze
28	13	light breeze
29	13	light breeze
30	13	light breeze

Sunrise & sunset in April

DaylightNight

Daylight runs from about 12 h 24 min at the start of April to 13 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 78 minutes over April. Sunrise moves from 6:27 AM to 5:41 AM, and sunset from 6:53 PM to 7:25 PM.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Daylight (h)	12.4	12.5	12.5	12.6	12.6	12.7	12.7	12.7	12.8	12.8	12.9	12.9	13.0	13.0	13.1	13.1	13.2	13.2	13.3	13.3	13.3	13.4	13.4	13.5	13.5	13.6	13.6	13.7	13.7	13.7
Sunrise (AM)	6:27	6:26	6:24	6:22	6:20	6:19	6:17	6:15	6:14	6:12	6:10	6:09	6:07	6:05	6:04	6:02	6:00	5:59	5:57	5:56	5:54	5:52	5:51	5:49	5:48	5:46	5:45	5:43	5:42	5:41
Sunset (PM)	6:53	6:54	6:55	6:56	6:57	6:58	6:59	7:00	7:01	7:03	7:04	7:05	7:06	7:07	7:08	7:09	7:10	7:11	7:13	7:14	7:15	7:16	7:17	7:18	7:19	7:20	7:21	7:22	7:24	7:25

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	12.4	6:27	6:53
2	12.5	6:26	6:54
3	12.5	6:24	6:55
4	12.6	6:22	6:56
5	12.6	6:20	6:57
6	12.7	6:19	6:58
7	12.7	6:17	6:59
8	12.7	6:15	7:00
9	12.8	6:14	7:01
10	12.8	6:12	7:03
11	12.9	6:10	7:04
12	12.9	6:09	7:05
13	13.0	6:07	7:06
14	13.0	6:05	7:07
15	13.1	6:04	7:08
16	13.1	6:02	7:09
17	13.2	6:00	7:10
18	13.2	5:59	7:11
19	13.3	5:57	7:13
20	13.3	5:56	7:14
21	13.3	5:54	7:15
22	13.4	5:52	7:16
23	13.4	5:51	7:17
24	13.5	5:49	7:18
25	13.5	5:48	7:19
26	13.6	5:46	7:20
27	13.6	5:45	7:21
28	13.7	5:43	7:22
29	13.7	5:42	7:24
30	13.7	5:41	7:25

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 5.47 kWh/m².

For context, solar energy here swings from a low near 1.59 kWh/m² to a high of 7.29 kWh/m² in July across the year — April's 5.47 kWh/m² falls in the middle.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Solar energy (kWh/m²)	4.9	4.9	5.0	5.0	5.1	5.1	5.2	5.2	5.3	5.3	5.3	5.4	5.4	5.4	5.5	5.5	5.5	5.6	5.6	5.6	5.7	5.7	5.7	5.8	5.8	5.8	5.9	5.9	6.0	6.0
Level	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright

	Solar energy (kWh/m²)	Level
1	4.9	Bright
2	4.9	Bright
3	5.0	Bright
4	5.0	Bright
5	5.1	Bright
6	5.1	Bright
7	5.2	Bright
8	5.2	Bright
9	5.3	Bright
10	5.3	Bright
11	5.3	Bright
12	5.4	Bright
13	5.4	Bright
14	5.4	Bright
15	5.5	Bright
16	5.5	Bright
17	5.5	Bright
18	5.6	Bright
19	5.6	Bright
20	5.6	Bright
21	5.7	Bright
22	5.7	Bright
23	5.7	Bright
24	5.8	Bright
25	5.8	Bright
26	5.8	Bright
27	5.9	Bright
28	5.9	Bright
29	6.0	Bright
30	6.0	Bright

Planning a trip in April

Hazard calendar for Viana do Castelo

In seasonPeak

In April, Viana do Castelo sits inside its rainy season season. The full year is below, with each hazard's peak months called out.

Viana do Castelo's rainy season runs October–May, when most of the year's rain falls.

Rainy season

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Is April a good time to visit Viana do Castelo?

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

5.0

Sightseeing

7th-best month of the year

1.0

Beach & pool

7th-best month of the year

April is a reasonable time to visit Viana do Castelo for sightseeing.

What to pack for Viana do Castelo in April

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

In April, Viana do Castelo sees daytime highs around 17°C and nights near 10°C. Worth packing: a warm layer, rain gear and sun protection. About 13 days see rain.

a warm layerrain gearsun protection

Sea temperature near Viana do Castelo in April

The nearest coast averages about 14°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 17°C and coldest in February near 13°C.

The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sea temperature (°C)	14	13	14	14	15	17	17	17	17	17	16	15
Comfort	Bracing	Bracing	Bracing	Bracing	Cool	Cool	Cool	Cool	Cool	Cool	Cool	Bracing

	Sea temperature (°C)	Comfort
Jan	14	Bracing
Feb	13	Bracing
Mar	14	Bracing
Apr	14	Bracing
May	15	Cool
Jun	17	Cool
Jul	17	Cool
Aug	17	Cool
Sep	17	Cool
Oct	17	Cool
Nov	16	Cool
Dec	15	Bracing

UV index in Viana do Castelo 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 Viana do Castelo peaks around June 23 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	2	3	5	6	7	9	9	8	6	4	2	2
Level	Low	Moderate	Moderate	High	High	Very high	Very high	Very high	High	Moderate	Moderate	Low

	UV index (midday)	Level
Jan	2	Low
Feb	3	Moderate
Mar	5	Moderate
Apr	6	High
May	7	High
Jun	9	Very high
Jul	9	Very high
Aug	8	Very high
Sep	6	High
Oct	4	Moderate
Nov	2	Moderate
Dec	2	Low

Location & terrain

Where is Viana do Castelo?

Viana do Castelo sits at 41.7°N, 8.8°W, 12 m above sea level, in Portugal. The nearest listed city is Esposende, 18 km away.

Topography around Viana do Castelo

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Viana do Castelo.

Within 3 km, the terrain around Viana do Castelo has significant variations in elevation — a maximum elevation change of 300 m around an average of 29 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 793 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,517 m.

The land around Viana do Castelo is covered by water (37%), trees (23%) and artificial surfaces (22%) within 3 km, water (47%) and trees (29%) within 16 km, and trees (38%), water (32%) and grassland (22%) within 80 km.

3 km

300 m

water 37%

16 km

793 m

water 47%

80 km

1,517 m

trees 38%

treesshrubsgrasslandcroplandartificial surfacesbare terrainwaterwetland

← March Viana do Castelo year-round climate May →Best places to visit in April

April weather nearby: Esposende 18 km · Ponte de Lima 22 km · Barcelos 25 km · Pedroso 32 km · Póvoa de Varzim 35 km · Braga 38 km · Arcos de Valdevez 38 km · Vila do Conde 38 km

Portugal travel facts

Travel advisory: Level 1; Exercise Normal Precautions
Power plugs: Type C / E / F; 230 V · 50 Hz
Prices: ≈ 60% of US; price level, 2025
GDP per capita: $32,082; 2025
Happiness: 6.0 / 10; World Happiness, 2025
Safe drinking water: 95%; of population, 2024
Homicide rate: 0.7; per 100k, 2022
Road deaths: 8.2; per 100k/yr, 2019
Income group: High; World Bank
English: Very high; EF EPI 612
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 Viana do Castelo (41.6932°, -8.8329°, elevation 12 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. 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).

	Avg high (°C)	Avg low (°C)
1	16	9
2	16	9
3	16	9
4	16	9
5	16	9
6	16	9
7	16	9
8	16	9
9	16	9
10	16	9
11	16	10
12	16	10
13	16	10
14	17	10
15	17	10
16	17	10
17	17	10
18	17	10
19	17	10
20	17	10
21	17	10
22	17	10
23	17	10
24	17	10
25	17	10
26	17	10
27	17	10
28	17	10
29	17	10
30	17	10

	Clearer (%)	Cloudier (%)
1	50	50
2	50	50
3	51	49
4	52	48
5	52	48
6	53	47
7	53	47
8	53	47
9	54	46
10	54	46
11	54	46
12	54	46
13	52	48
14	52	48
15	52	48
16	51	49
17	49	51
18	49	51
19	49	51
20	49	51
21	48	52
22	48	52
23	47	53
24	47	53
25	47	53
26	47	53
27	49	51
28	49	51
29	49	51
30	50	50

	Rain chance (%)
1	43
2	43
3	43
4	43
5	42
6	42
7	41
8	41
9	41
10	41
11	41
12	41
13	42
14	42
15	42
16	43
17	43
18	44
19	44
20	45
21	45
22	45
23	45
24	45
25	45
26	44
27	44
28	43
29	42
30	42

	Dry (%)	Comfortable (%)
1	98	2
2	98	2
3	98	2
4	98	2
5	98	2
6	97	3
7	97	3
8	97	3
9	97	3
10	97	3
11	96	4
12	96	4
13	96	4
14	96	4
15	95	5
16	95	5
17	95	5
18	94	6
19	94	6
20	93	7
21	93	7
22	92	8
23	92	8
24	91	9
25	91	9
26	90	10
27	89	11
28	89	11
29	88	12
30	87	13

	Avg high (°C)	Avg low (°C)
1	16	9
2	16	9
3	16	9
4	16	9
5	16	9
6	16	9
7	16	9
8	16	9
9	16	9
10	16	9
11	16	10
12	16	10
13	16	10
14	17	10
15	17	10
16	17	10
17	17	10
18	17	10
19	17	10
20	17	10
21	17	10
22	17	10
23	17	10
24	17	10
25	17	10
26	17	10
27	17	10
28	17	10
29	17	10
30	17	10

	Clearer (%)	Cloudier (%)
1	50	50
2	50	50
3	51	49
4	52	48
5	52	48
6	53	47
7	53	47
8	53	47
9	54	46
10	54	46
11	54	46
12	54	46
13	52	48
14	52	48
15	52	48
16	51	49
17	49	51
18	49	51
19	49	51
20	49	51
21	48	52
22	48	52
23	47	53
24	47	53
25	47	53
26	47	53
27	49	51
28	49	51
29	49	51
30	50	50

	Rain chance (%)
1	43
2	43
3	43
4	43
5	42
6	42
7	41
8	41
9	41
10	41
11	41
12	41
13	42
14	42
15	42
16	43
17	43
18	44
19	44
20	45
21	45
22	45
23	45
24	45
25	45
26	44
27	44
28	43
29	42
30	42

	Dry (%)	Comfortable (%)
1	98	2
2	98	2
3	98	2
4	98	2
5	98	2
6	97	3
7	97	3
8	97	3
9	97	3
10	97	3
11	96	4
12	96	4
13	96	4
14	96	4
15	95	5
16	95	5
17	95	5
18	94	6
19	94	6
20	93	7
21	93	7
22	92	8
23	92	8
24	91	9
25	91	9
26	90	10
27	89	11
28	89	11
29	88	12
30	87	13

	Avg high (°C)	Avg low (°C)
1	16	9
2	16	9
3	16	9
4	16	9
5	16	9
6	16	9
7	16	9
8	16	9
9	16	9
10	16	9
11	16	10
12	16	10
13	16	10
14	17	10
15	17	10
16	17	10
17	17	10
18	17	10
19	17	10
20	17	10
21	17	10
22	17	10
23	17	10
24	17	10
25	17	10
26	17	10
27	17	10
28	17	10
29	17	10
30	17	10

	Clearer (%)	Cloudier (%)
1	50	50
2	50	50
3	51	49
4	52	48
5	52	48
6	53	47
7	53	47
8	53	47
9	54	46
10	54	46
11	54	46
12	54	46
13	52	48
14	52	48
15	52	48
16	51	49
17	49	51
18	49	51
19	49	51
20	49	51
21	48	52
22	48	52
23	47	53
24	47	53
25	47	53
26	47	53
27	49	51
28	49	51
29	49	51
30	50	50

	Rain chance (%)
1	43
2	43
3	43
4	43
5	42
6	42
7	41
8	41
9	41
10	41
11	41
12	41
13	42
14	42
15	42
16	43
17	43
18	44
19	44
20	45
21	45
22	45
23	45
24	45
25	45
26	44
27	44
28	43
29	42
30	42

	Dry (%)	Comfortable (%)
1	98	2
2	98	2
3	98	2
4	98	2
5	98	2
6	97	3
7	97	3
8	97	3
9	97	3
10	97	3
11	96	4
12	96	4
13	96	4
14	96	4
15	95	5
16	95	5
17	95	5
18	94	6
19	94	6
20	93	7
21	93	7
22	92	8
23	92	8
24	91	9
25	91	9
26	90	10
27	89	11
28	89	11
29	88	12
30	87	13