Altsasu weather in April

In April, Altsasu sees average daytime highs of 15°C and overnight lows near 6°C, with 113 mm of precipitation across 16 wet days and about 13.1 hours of daylight. It is the 7th-warmest and 3rd-wettest month of the year here.

Highs climb over the month, from about 14°C in the first days to 16°C by the end. The sky is clear or mostly clear about 17% 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 Altsasu's 8th-clearest and 6th-windiest month. For the whole year in context, see Altsasu's year-round climate.

Daytime high: 15°; 7th warmest
Overnight low: 6°; 6th coldest
Precipitation: 113 mm; 16 wet days
Daylight: 13 h 12 min; 6:34 AM – 7:44 PM
Cloud cover: 69%; 8th clearest
Wind: 9 km/h; 6th windiest
Solar energy: 4.69 kWh/m²
Travel score: 3.7; out of 10

Altsasu is municipality of Spain.

Density: 276/km²; people per km²

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

← March Altsasu 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

Highs climb over the month, from about 14°C in the first days to 16°C by the end.

A typical April day in Altsasu reaches about 15°C in the afternoon and slips back to 6°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 9°C and 20°C. Set against its neighbours, April runs about 2°C warmer than March and about 3°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	14	15	15	15	15	15	15	15	15	15	16	16	16	16	16	16	16
Avg low (°C)	5	5	5	5	5	5	6	6	6	6	6	6	6	6	6	6	6	6	6	6	7	7	7	7	7	7	7	7	7	7

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

How April really feels in Altsasu

Once humidity and wind are folded in, April averages 0 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

heat index over the day's high

Days feeling ≤ 0°C

wind chill below the day's low

April sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Altsasu weather by month

How April compares with the rest of the year at a glance. April is the 7th-warmest and 3rd-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Snow days	Daylight (hours)	Travel score
Jan	9° / 3°	113	15.1	3.3	9.2	1.5
Feb	10° / 3°	103	13.6	4	10.2	2.0
Mar	13° / 4°	100	14	2.2	11.6	3.2
Apr	15° / 6°	113	16	0.6	13.1	3.7
May	18° / 9°	106	15.3	0	14.4	5.0
Jun	21° / 12°	79	11.6	0	15.1	6.2
Jul	23° / 14°	59	10.4	0	14.8	6.9
Aug	24° / 14°	65	11.8	0	13.8	6.8
Sep	21° / 12°	70	11.6	0	12.3	6.2
Oct	18° / 9°	96	12.7	0.1	10.8	5.3
Nov	12° / 6°	127	15	0.8	9.5	2.8
Dec	9° / 3°	101	13.8	2.2	8.9	1.8

Cloud cover in April

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 17% 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 69%.

	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 (%)	34	33	34	32	32	32	32	30	30	31	31	31	30	31	31	30	31	31	30	31	30	31	31	31	31	30	31	31	31	30
Cloudier (%)	66	67	66	68	68	68	68	70	70	69	69	69	70	69	69	70	69	69	70	69	70	69	69	69	69	70	69	69	69	70

	Clearer (%)	Cloudier (%)
1	34	66
2	33	67
3	34	66
4	32	68
5	32	68
6	32	68
7	32	68
8	30	70
9	30	70
10	31	69
11	31	69
12	31	69
13	30	70
14	31	69
15	31	69
16	30	70
17	31	69
18	31	69
19	30	70
20	31	69
21	30	70
22	31	69
23	31	69
24	31	69
25	31	69
26	30	70
27	31	69
28	31	69
29	31	69
30	30	70

Chance of precipitation in April

Any precipitationSnow

Altsasu gets around 113 mm of rain and snow over 16 wet days in April. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 54% and peaks near 56% on the wettest days, and about 1 day brings snow.

	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 (%)	51	52	52	52	52	52	52	52	52	52	53	53	53	54	54	54	54	54	54	54	54	55	55	55	55	56	56	56	56	56
Snow chance (%)	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	2	2	2	2	1	1	1	1	1	1	1	1	0	0	0

	Rain chance (%)	Snow chance (%)
1	51	3
2	52	3
3	52	3
4	52	3
5	52	3
6	52	3
7	52	3
8	52	3
9	52	3
10	52	3
11	53	3
12	53	3
13	53	3
14	54	3
15	54	3
16	54	2
17	54	2
18	54	2
19	54	2
20	54	1
21	54	1
22	55	1
23	55	1
24	55	1
25	55	1
26	56	1
27	56	1
28	56	0
29	56	0
30	56	0

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 100% 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 (%)	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	99	99	99	99
Comfortable (%)	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	1	1	1	1

	Dry (%)	Comfortable (%)
1	100	0
2	100	0
3	100	0
4	100	0
5	100	0
6	100	0
7	100	0
8	100	0
9	100	0
10	100	0
11	100	0
12	100	0
13	100	0
14	100	0
15	100	0
16	100	0
17	100	0
18	100	0
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	99	1
28	99	1
29	99	1
30	99	1

Wind in April

Winds average 9 km/h in April.

Across April, daily wind ranges from about 9 km/h on the calmest days to 10 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)	10	10	10	10	10	10	10	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9
Feels	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm

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

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 7:00 AM to 6:12 AM, and sunset from 7:26 PM to 8:00 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	13.5	13.6	13.6	13.7	13.7	13.8	13.8
Sunrise (AM)	7:00	6:58	6:57	6:55	6:53	6:51	6:49	6:48	6:46	6:44	6:42	6:41	6:39	6:37	6:35	6:34	6:32	6:30	6:29	6:27	6:26	6:24	6:22	6:21	6:19	6:18	6:16	6:15	6:13	6:12
Sunset (PM)	7:26	7:28	7:29	7:30	7:31	7:32	7:33	7:35	7:36	7:37	7:38	7:39	7:40	7:42	7:43	7:44	7:45	7:46	7:47	7:49	7:50	7:51	7:52	7:53	7:55	7:56	7:57	7:58	7:59	8:00

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	12.4	7:00	7:26
2	12.5	6:58	7:28
3	12.5	6:57	7:29
4	12.6	6:55	7:30
5	12.6	6:53	7:31
6	12.7	6:51	7:32
7	12.7	6:49	7:33
8	12.8	6:48	7:35
9	12.8	6:46	7:36
10	12.9	6:44	7:37
11	12.9	6:42	7:38
12	13.0	6:41	7:39
13	13.0	6:39	7:40
14	13.1	6:37	7:42
15	13.1	6:35	7:43
16	13.2	6:34	7:44
17	13.2	6:32	7:45
18	13.3	6:30	7:46
19	13.3	6:29	7:47
20	13.4	6:27	7:49
21	13.4	6:26	7:50
22	13.5	6:24	7:51
23	13.5	6:22	7:52
24	13.5	6:21	7:53
25	13.6	6:19	7:55
26	13.6	6:18	7:56
27	13.7	6:16	7:57
28	13.7	6:15	7:58
29	13.8	6:13	7:59
30	13.8	6:12	8:00

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 4.69 kWh/m².

For context, solar energy here swings from a low near 1.42 kWh/m² to a high of 5.91 kWh/m² in June across the year — April's 4.69 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)	4.3	4.3	4.4	4.4	4.4	4.4	4.5	4.5	4.5	4.6	4.6	4.6	4.7	4.7	4.7	4.7	4.8	4.8	4.8	4.8	4.9	4.9	4.9	4.9	5.0	5.0	5.0	5.0	5.0	5.0
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	4.3	Bright
2	4.3	Bright
3	4.4	Bright
4	4.4	Bright
5	4.4	Bright
6	4.4	Bright
7	4.5	Bright
8	4.5	Bright
9	4.5	Bright
10	4.6	Bright
11	4.6	Bright
12	4.6	Bright
13	4.7	Bright
14	4.7	Bright
15	4.7	Bright
16	4.7	Bright
17	4.8	Bright
18	4.8	Bright
19	4.8	Bright
20	4.8	Bright
21	4.9	Bright
22	4.9	Bright
23	4.9	Bright
24	4.9	Bright
25	5.0	Bright
26	5.0	Bright
27	5.0	Bright
28	5.0	Bright
29	5.0	Bright
30	5.0	Bright

Planning a trip in April

Is April a good time to visit Altsasu?

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

3.7

Sightseeing

7th-best month of the year

0.1

Beach & pool

7th-best month of the year

April is a weaker month for outdoor sightseeing in Altsasu.

What to pack for Altsasu in April

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

In April, Altsasu sees daytime highs around 15°C and nights near 6°C. Pack rain gear. Worth having: a warm layer and sun protection. About 16 days see rain.

rain geara warm layersun protection

Sea temperature near Altsasu 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 at the nearest coast (about 53 km away) is warmest in August at about 22°C and coldest in February near 12°C.

It's comfortable for a long swim from Jul 2 to Sep 25 — about 2.8 months when the water holds above 20°C.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sea temperature (°C)	13	12	13	14	16	19	21	22	21	18	16	14
Comfort	Bracing	Bracing	Bracing	Bracing	Cool	Cool	Refreshing	Refreshing	Refreshing	Cool	Cool	Bracing

	Sea temperature (°C)	Comfort
Jan	13	Bracing
Feb	12	Bracing
Mar	13	Bracing
Apr	14	Bracing
May	16	Cool
Jun	19	Cool
Jul	21	Refreshing
Aug	22	Refreshing
Sep	21	Refreshing
Oct	18	Cool
Nov	16	Cool
Dec	14	Bracing

UV index in Altsasu 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 Altsasu peaks around July 15 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 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	7	9	9	8	6	4	2	1
Level	Low	Moderate	Moderate	High	High	Very high	Very high	Very high	High	Moderate	Low	Low

	UV index (midday)	Level
Jan	2	Low
Feb	2	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	Low
Dec	1	Low

Location & terrain

Where is Altsasu?

Altsasu sits at 42.9°N, 2.2°W, 0 m above sea level, in Spain. The nearest listed city is Tolosa, 27 km away.

Topography around Altsasu

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

Within 3 km, the terrain around Altsasu has large variations in elevation — a maximum elevation change of 625 m around an average of 594 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,365 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,532 m.

The land around Altsasu is covered by trees (66%) and grassland (24%) within 3 km, trees (72%) and grassland (23%) within 16 km, and trees (44%) and cropland (22%) within 80 km.

3 km

625 m

trees 66%

16 km

1,365 m

trees 72%

80 km

1,532 m

trees 44%

treesshrubsgrasslandcroplandartificial surfaceswater

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

April weather nearby: Tolosa 27 km · Arrasate / Mondragón 32 km · Eibar 40 km · Barañáin 41 km · Oria 41 km · Gasteiz / Vitoria 42 km · Ermitagaña 42 km · Ermua 42 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 Altsasu (42.9°, -2.1652°, elevation 0 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	5
2	14	5
3	14	5
4	14	5
5	14	5
6	14	5
7	14	6
8	14	6
9	14	6
10	14	6
11	14	6
12	14	6
13	14	6
14	14	6
15	15	6
16	15	6
17	15	6
18	15	6
19	15	6
20	15	6
21	15	7
22	15	7
23	15	7
24	16	7
25	16	7
26	16	7
27	16	7
28	16	7
29	16	7
30	16	7

	Clearer (%)	Cloudier (%)
1	34	66
2	33	67
3	34	66
4	32	68
5	32	68
6	32	68
7	32	68
8	30	70
9	30	70
10	31	69
11	31	69
12	31	69
13	30	70
14	31	69
15	31	69
16	30	70
17	31	69
18	31	69
19	30	70
20	31	69
21	30	70
22	31	69
23	31	69
24	31	69
25	31	69
26	30	70
27	31	69
28	31	69
29	31	69
30	30	70

	Rain chance (%)	Snow chance (%)
1	51	3
2	52	3
3	52	3
4	52	3
5	52	3
6	52	3
7	52	3
8	52	3
9	52	3
10	52	3
11	53	3
12	53	3
13	53	3
14	54	3
15	54	3
16	54	2
17	54	2
18	54	2
19	54	2
20	54	1
21	54	1
22	55	1
23	55	1
24	55	1
25	55	1
26	56	1
27	56	1
28	56	0
29	56	0
30	56	0

	Dry (%)	Comfortable (%)
1	100	0
2	100	0
3	100	0
4	100	0
5	100	0
6	100	0
7	100	0
8	100	0
9	100	0
10	100	0
11	100	0
12	100	0
13	100	0
14	100	0
15	100	0
16	100	0
17	100	0
18	100	0
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	99	1
28	99	1
29	99	1
30	99	1

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

	Clearer (%)	Cloudier (%)
1	34	66
2	33	67
3	34	66
4	32	68
5	32	68
6	32	68
7	32	68
8	30	70
9	30	70
10	31	69
11	31	69
12	31	69
13	30	70
14	31	69
15	31	69
16	30	70
17	31	69
18	31	69
19	30	70
20	31	69
21	30	70
22	31	69
23	31	69
24	31	69
25	31	69
26	30	70
27	31	69
28	31	69
29	31	69
30	30	70

	Rain chance (%)	Snow chance (%)
1	51	3
2	52	3
3	52	3
4	52	3
5	52	3
6	52	3
7	52	3
8	52	3
9	52	3
10	52	3
11	53	3
12	53	3
13	53	3
14	54	3
15	54	3
16	54	2
17	54	2
18	54	2
19	54	2
20	54	1
21	54	1
22	55	1
23	55	1
24	55	1
25	55	1
26	56	1
27	56	1
28	56	0
29	56	0
30	56	0

	Dry (%)	Comfortable (%)
1	100	0
2	100	0
3	100	0
4	100	0
5	100	0
6	100	0
7	100	0
8	100	0
9	100	0
10	100	0
11	100	0
12	100	0
13	100	0
14	100	0
15	100	0
16	100	0
17	100	0
18	100	0
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	99	1
28	99	1
29	99	1
30	99	1

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

	Clearer (%)	Cloudier (%)
1	34	66
2	33	67
3	34	66
4	32	68
5	32	68
6	32	68
7	32	68
8	30	70
9	30	70
10	31	69
11	31	69
12	31	69
13	30	70
14	31	69
15	31	69
16	30	70
17	31	69
18	31	69
19	30	70
20	31	69
21	30	70
22	31	69
23	31	69
24	31	69
25	31	69
26	30	70
27	31	69
28	31	69
29	31	69
30	30	70

	Rain chance (%)	Snow chance (%)
1	51	3
2	52	3
3	52	3
4	52	3
5	52	3
6	52	3
7	52	3
8	52	3
9	52	3
10	52	3
11	53	3
12	53	3
13	53	3
14	54	3
15	54	3
16	54	2
17	54	2
18	54	2
19	54	2
20	54	1
21	54	1
22	55	1
23	55	1
24	55	1
25	55	1
26	56	1
27	56	1
28	56	0
29	56	0
30	56	0

	Dry (%)	Comfortable (%)
1	100	0
2	100	0
3	100	0
4	100	0
5	100	0
6	100	0
7	100	0
8	100	0
9	100	0
10	100	0
11	100	0
12	100	0
13	100	0
14	100	0
15	100	0
16	100	0
17	100	0
18	100	0
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	99	1
28	99	1
29	99	1
30	99	1