Castro-Urdiales weather in April

In April, Castro-Urdiales sees average daytime highs of 15°C and overnight lows near 11°C, with 89 mm of rain across 13.8 wet days and about 13.2 hours of daylight. It is the 8th-warmest and 7th-wettest month of the year here.

Day-to-day highs hold fairly steady near 15°C through the month. The sky is clear or mostly clear about 22% 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 48 min by month's end. Set against the rest of the year, April is Castro-Urdiales's 8th-clearest and 6th-windiest month. For the whole year in context, see Castro-Urdiales's year-round climate.

Daytime high: 15°; 8th warmest
Overnight low: 11°; 5th coldest
Rainfall: 89 mm; 13.8 wet days
Daylight: 13 h 12 min; 6:37 AM – 7:49 PM
Cloud cover: 63%; 8th clearest
Wind: 15 km/h; 6th windiest
Solar energy: 4.89 kWh/m²
Travel score: 4.0; out of 10

Castro-Urdiales is capital of Castro-Urdiales Municipality, Spain.

Air quality: Good; PM10 15.1 µg/m³ · 2019

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

← March Castro-Urdiales 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 15°C through the month.

A typical April day in Castro-Urdiales reaches about 15°C in the afternoon and slips back to 11°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 12°C and 18°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)	14	14	14	14	14	14	14	14	14	14	14	14	14	15	15	15	15	15	15	15	15	15	15	15	15	15	16	16	16	16
Avg low (°C)	10	10	10	10	10	10	10	10	10	10	10	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	12	12	12	12

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

Castro-Urdiales weather by month

How April compares with the rest of the year at a glance. April is the 8th-warmest and 7th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	12° / 9°	119	15	9.2	2.9
Feb	12° / 8°	103	13.5	10.2	2.9
Mar	14° / 10°	98	13.2	11.6	3.7
Apr	15° / 11°	89	13.8	13.2	4.0
May	17° / 13°	69	12.7	14.5	5.1
Jun	20° / 16°	56	9.9	15.2	6.2
Jul	22° / 18°	46	9.1	14.9	6.9
Aug	23° / 19°	49	9.4	13.8	7.0
Sep	21° / 17°	66	10.9	12.3	6.4
Oct	19° / 15°	103	13.8	10.8	5.5
Nov	15° / 12°	152	16.1	9.5	3.9
Dec	13° / 10°	117	14.9	8.8	3.3

Cloud cover in April

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 22% of the time in April.

Beyond those clear spells, partly cloudy skies cover about 20% of April, with mostly cloudy or overcast conditions the remaining 58%.

	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 (%)	42	42	43	44	43	43	43	43	44	44	44	44	44	44	44	44	44	43	43	42	41	41	40	40	39	39	40	39	38	38
Cloudier (%)	58	58	57	56	57	57	57	57	56	56	56	56	56	56	56	56	56	57	57	58	59	59	60	60	61	61	60	61	62	62

	Clearer (%)	Cloudier (%)
1	42	58
2	42	58
3	43	57
4	44	56
5	43	57
6	43	57
7	43	57
8	43	57
9	44	56
10	44	56
11	44	56
12	44	56
13	44	56
14	44	56
15	44	56
16	44	56
17	44	56
18	43	57
19	43	57
20	42	58
21	41	59
22	41	59
23	40	60
24	40	60
25	39	61
26	39	61
27	40	60
28	39	61
29	38	62
30	38	62

Chance of precipitation in April

Any precipitation

Castro-Urdiales gets around 89 mm of rain over 13.8 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 46% and peaks near 47% 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 (%)	46	46	46	46	46	46	46	46	46	46	46	46	46	46	46	46	46	46	46	46	46	46	47	47	47	47	47	47	47	47

	Rain chance (%)
1	46
2	46
3	46
4	46
5	46
6	46
7	46
8	46
9	46
10	46
11	46
12	46
13	46
14	46
15	46
16	46
17	46
18	46
19	46
20	46
21	46
22	46
23	47
24	47
25	47
26	47
27	47
28	47
29	47
30	47

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 96% 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 (%)	99	99	99	99	99	99	99	98	98	98	98	98	98	98	98	98	97	97	97	96	96	95	95	94	93	92	91	90	89	88
Comfortable (%)	1	1	1	1	1	1	1	2	2	2	2	2	2	2	2	2	3	3	3	4	4	5	5	6	7	8	9	10	11	12

	Dry (%)	Comfortable (%)
1	99	1
2	99	1
3	99	1
4	99	1
5	99	1
6	99	1
7	99	1
8	98	2
9	98	2
10	98	2
11	98	2
12	98	2
13	98	2
14	98	2
15	98	2
16	98	2
17	97	3
18	97	3
19	97	3
20	96	4
21	96	4
22	95	5
23	95	5
24	94	6
25	93	7
26	92	8
27	91	9
28	90	10
29	89	11
30	88	12

Wind in April

Winds average 15 km/h in April.

Across April, daily wind ranges from about 15 km/h on the calmest days to 16 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)	16	16	16	16	16	16	16	16	16	16	16	15	15	15	15	15	15	15	15	15	15	15	15	15	15	15	15	15	15	15
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	16	light breeze
2	16	light breeze
3	16	light breeze
4	16	light breeze
5	16	light breeze
6	16	light breeze
7	16	light breeze
8	16	light breeze
9	16	light breeze
10	16	light breeze
11	16	light breeze
12	15	light breeze
13	15	light breeze
14	15	light breeze
15	15	light breeze
16	15	light breeze
17	15	light breeze
18	15	light breeze
19	15	light breeze
20	15	light breeze
21	15	light breeze
22	15	light breeze
23	15	light breeze
24	15	light breeze
25	15	light breeze
26	15	light breeze
27	15	light breeze
28	15	light breeze
29	15	light breeze
30	15	light breeze

Sunrise & sunset in April

DaylightNight

Daylight runs from about 12 h 24 min at the start of April to 13 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 84 minutes over April. Sunrise moves from 7:04 AM to 6:15 AM, and sunset from 7:31 PM to 8:05 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	12.8	12.8	12.9	12.9	13.0	13.0	13.1	13.1	13.2	13.2	13.3	13.3	13.4	13.4	13.5	13.5	13.6	13.6	13.7	13.7	13.8	13.8	13.8
Sunrise (AM)	7:04	7:02	7:01	6:59	6:57	6:55	6:53	6:51	6:50	6:48	6:46	6:44	6:43	6:41	6:39	6:37	6:36	6:34	6:32	6:31	6:29	6:27	6:26	6:24	6:23	6:21	6:19	6:18	6:16	6:15
Sunset (PM)	7:31	7:32	7:33	7:34	7:36	7:37	7:38	7:39	7:40	7:42	7:43	7:44	7:45	7:46	7:48	7:49	7:50	7:51	7:52	7:54	7:55	7:56	7:57	7:58	8:00	8:01	8:02	8:03	8:04	8:05

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	12.4	7:04	7:31
2	12.5	7:02	7:32
3	12.5	7:01	7:33
4	12.6	6:59	7:34
5	12.6	6:57	7:36
6	12.7	6:55	7:37
7	12.7	6:53	7:38
8	12.8	6:51	7:39
9	12.8	6:50	7:40
10	12.9	6:48	7:42
11	12.9	6:46	7:43
12	13.0	6:44	7:44
13	13.0	6:43	7:45
14	13.1	6:41	7:46
15	13.1	6:39	7:48
16	13.2	6:37	7:49
17	13.2	6:36	7:50
18	13.3	6:34	7:51
19	13.3	6:32	7:52
20	13.4	6:31	7:54
21	13.4	6:29	7:55
22	13.5	6:27	7:56
23	13.5	6:26	7:57
24	13.6	6:24	7:58
25	13.6	6:23	8:00
26	13.7	6:21	8:01
27	13.7	6:19	8:02
28	13.8	6:18	8:03
29	13.8	6:16	8:04
30	13.8	6:15	8:05

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 4.89 kWh/m².

For context, solar energy here swings from a low near 1.4 kWh/m² to a high of 6.12 kWh/m² in June across the year — April's 4.89 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)	4.5	4.5	4.5	4.5	4.6	4.6	4.6	4.7	4.7	4.7	4.8	4.8	4.8	4.9	4.9	4.9	5.0	5.0	5.0	5.0	5.1	5.1	5.1	5.1	5.2	5.2	5.2	5.2	5.2	5.3
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	4.5	Bright
2	4.5	Bright
3	4.5	Bright
4	4.5	Bright
5	4.6	Bright
6	4.6	Bright
7	4.6	Bright
8	4.7	Bright
9	4.7	Bright
10	4.7	Bright
11	4.8	Bright
12	4.8	Bright
13	4.8	Bright
14	4.9	Bright
15	4.9	Bright
16	4.9	Bright
17	5.0	Bright
18	5.0	Bright
19	5.0	Bright
20	5.0	Bright
21	5.1	Bright
22	5.1	Bright
23	5.1	Bright
24	5.1	Bright
25	5.2	Bright
26	5.2	Bright
27	5.2	Bright
28	5.2	Bright
29	5.2	Bright
30	5.3	Bright

Planning a trip in April

Is April a good time to visit Castro-Urdiales?

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

4.0

Sightseeing

7th-best month of the year

0.1

Beach & pool

8th-best month of the year

April is a reasonable time to visit Castro-Urdiales for sightseeing.

What to pack for Castro-Urdiales in April

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

In April, Castro-Urdiales sees daytime highs around 15°C and nights near 11°C. Pack rain gear. Worth having: a warm layer and sun protection. About 14 days see rain.

rain geara warm layersun protection

Sea temperature near Castro-Urdiales in April

The nearest coast averages about 13°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 22°C and coldest in February near 13°C.

It's comfortable for a long swim from Jul 11 to Sep 21 — about 2.4 months when the water holds above 20°C.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sea temperature (°C)	13	13	13	13	15	18	21	22	20	18	16	14
Comfort	Bracing	Bracing	Bracing	Bracing	Cool	Cool	Refreshing	Refreshing	Refreshing	Cool	Cool	Bracing

	Sea temperature (°C)	Comfort
Jan	13	Bracing
Feb	13	Bracing
Mar	13	Bracing
Apr	13	Bracing
May	15	Cool
Jun	18	Cool
Jul	21	Refreshing
Aug	22	Refreshing
Sep	20	Refreshing
Oct	18	Cool
Nov	16	Cool
Dec	14	Bracing

UV index in Castro-Urdiales 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 Castro-Urdiales peaks around July 15 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 1 (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	2	5	6	6	8	9	8	5	4	2	1
Level	Low	Low	Moderate	High	High	Very high	Very high	Very high	High	Moderate	Low	Low

	UV index (midday)	Level
Jan	2	Low
Feb	2	Low
Mar	5	Moderate
Apr	6	High
May	6	High
Jun	8	Very high
Jul	9	Very high
Aug	8	Very high
Sep	5	High
Oct	4	Moderate
Nov	2	Low
Dec	1	Low

Location & terrain

Where is Castro-Urdiales?

Castro-Urdiales sits at 43.4°N, 3.2°W, 18 m above sea level, in Spain. The nearest listed city is Santurtzi, 16 km away.

Topography around Castro-Urdiales

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Castro-Urdiales.

Within 3 km, the terrain around Castro-Urdiales has significant variations in elevation — a maximum elevation change of 455 m around an average of 60 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 851 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,676 m.

The land around Castro-Urdiales is covered by water (46%) and trees (30%) within 3 km, water (50%) and trees (35%) within 16 km, and trees (37%), water (35%) and grassland (20%) within 80 km.

3 km

455 m

water 46%

16 km

851 m

water 50%

80 km

1,676 m

trees 37%

treesgrasslandcroplandartificial surfaceswater

← March Castro-Urdiales year-round climate May →Best places to visit in April

April weather nearby: Santurtzi 16 km · Getxo 17 km · Algorta 17 km · Portugalete 18 km · Sestao 19 km · Leioa 20 km · Barakaldo 21 km · Erandio 22 km

Spain travel facts

Travel advisory: Level 2; Exercise Increased Caution
Power plugs: Type C / F; 230 V · 50 Hz
Prices: ≈ 65% of US; price level, 2025
GDP per capita: $38,627; 2025
Happiness: 6.5 / 10; World Happiness, 2025
Safe drinking water: 99%; of population, 2024
Homicide rate: 0.7; per 100k, 2023
Road deaths: 3.9; per 100k/yr, 2019
Income group: High; World Bank
English: Moderate; EF EPI 540
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 Castro-Urdiales (43.3828°, -3.2204°, 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. 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	14	10
2	14	10
3	14	10
4	14	10
5	14	10
6	14	10
7	14	10
8	14	10
9	14	10
10	14	10
11	14	10
12	14	11
13	14	11
14	15	11
15	15	11
16	15	11
17	15	11
18	15	11
19	15	11
20	15	11
21	15	11
22	15	11
23	15	11
24	15	11
25	15	11
26	15	11
27	16	12
28	16	12
29	16	12
30	16	12

	Clearer (%)	Cloudier (%)
1	42	58
2	42	58
3	43	57
4	44	56
5	43	57
6	43	57
7	43	57
8	43	57
9	44	56
10	44	56
11	44	56
12	44	56
13	44	56
14	44	56
15	44	56
16	44	56
17	44	56
18	43	57
19	43	57
20	42	58
21	41	59
22	41	59
23	40	60
24	40	60
25	39	61
26	39	61
27	40	60
28	39	61
29	38	62
30	38	62

	Rain chance (%)
1	46
2	46
3	46
4	46
5	46
6	46
7	46
8	46
9	46
10	46
11	46
12	46
13	46
14	46
15	46
16	46
17	46
18	46
19	46
20	46
21	46
22	46
23	47
24	47
25	47
26	47
27	47
28	47
29	47
30	47

	Dry (%)	Comfortable (%)
1	99	1
2	99	1
3	99	1
4	99	1
5	99	1
6	99	1
7	99	1
8	98	2
9	98	2
10	98	2
11	98	2
12	98	2
13	98	2
14	98	2
15	98	2
16	98	2
17	97	3
18	97	3
19	97	3
20	96	4
21	96	4
22	95	5
23	95	5
24	94	6
25	93	7
26	92	8
27	91	9
28	90	10
29	89	11
30	88	12

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

	Clearer (%)	Cloudier (%)
1	42	58
2	42	58
3	43	57
4	44	56
5	43	57
6	43	57
7	43	57
8	43	57
9	44	56
10	44	56
11	44	56
12	44	56
13	44	56
14	44	56
15	44	56
16	44	56
17	44	56
18	43	57
19	43	57
20	42	58
21	41	59
22	41	59
23	40	60
24	40	60
25	39	61
26	39	61
27	40	60
28	39	61
29	38	62
30	38	62

	Rain chance (%)
1	46
2	46
3	46
4	46
5	46
6	46
7	46
8	46
9	46
10	46
11	46
12	46
13	46
14	46
15	46
16	46
17	46
18	46
19	46
20	46
21	46
22	46
23	47
24	47
25	47
26	47
27	47
28	47
29	47
30	47

	Dry (%)	Comfortable (%)
1	99	1
2	99	1
3	99	1
4	99	1
5	99	1
6	99	1
7	99	1
8	98	2
9	98	2
10	98	2
11	98	2
12	98	2
13	98	2
14	98	2
15	98	2
16	98	2
17	97	3
18	97	3
19	97	3
20	96	4
21	96	4
22	95	5
23	95	5
24	94	6
25	93	7
26	92	8
27	91	9
28	90	10
29	89	11
30	88	12

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

	Clearer (%)	Cloudier (%)
1	42	58
2	42	58
3	43	57
4	44	56
5	43	57
6	43	57
7	43	57
8	43	57
9	44	56
10	44	56
11	44	56
12	44	56
13	44	56
14	44	56
15	44	56
16	44	56
17	44	56
18	43	57
19	43	57
20	42	58
21	41	59
22	41	59
23	40	60
24	40	60
25	39	61
26	39	61
27	40	60
28	39	61
29	38	62
30	38	62

	Rain chance (%)
1	46
2	46
3	46
4	46
5	46
6	46
7	46
8	46
9	46
10	46
11	46
12	46
13	46
14	46
15	46
16	46
17	46
18	46
19	46
20	46
21	46
22	46
23	47
24	47
25	47
26	47
27	47
28	47
29	47
30	47

	Dry (%)	Comfortable (%)
1	99	1
2	99	1
3	99	1
4	99	1
5	99	1
6	99	1
7	99	1
8	98	2
9	98	2
10	98	2
11	98	2
12	98	2
13	98	2
14	98	2
15	98	2
16	98	2
17	97	3
18	97	3
19	97	3
20	96	4
21	96	4
22	95	5
23	95	5
24	94	6
25	93	7
26	92	8
27	91	9
28	90	10
29	89	11
30	88	12