Ermua weather in May

In May, Ermua sees average daytime highs of 17°C and overnight lows near 12°C, with 93 mm of rain across 14.3 wet days and about 14.4 hours of daylight. It is the 6th-warmest and 8th-wettest month of the year here.

Highs climb over the month, from about 16°C in the first days to 19°C by the end. The sky is clear or mostly clear about 22% of the time in May, and the air most often feels dry.

Daylight stretches from about 13 h 54 min at the start of May to 14 h 54 min by month's end. Set against the rest of the year, May is Ermua's 7th-clearest and 8th-windiest month. For the whole year in context, see Ermua's year-round climate.

Daytime high: 17°; 6th warmest
Overnight low: 12°; 7th coldest
Rainfall: 93 mm; 14.3 wet days
Daylight: 14 h 30 min; 5:52 AM – 8:20 PM
Cloud cover: 64%; 7th clearest
Wind: 11 km/h; 8th windiest
Solar energy: 5.51 kWh/m²
Travel score: 5.0; out of 10

Ermua is capital of Ermua Municipality, Spain.

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

← April Ermua year-round climate June →Best places to visit in May

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

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 16°C in the first days to 19°C by the end.

A typical May day in Ermua reaches about 17°C in the afternoon and slips back to 12°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 13°C and 22°C. Set against its neighbours, May runs about 3°C warmer than April and about 3°C cooler than June.

	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	31
Avg high (°C)	16	16	16	16	16	16	17	17	17	17	17	17	17	17	17	17	17	18	18	18	18	18	18	18	18	18	19	19	19	19	19
Avg low (°C)	10	10	10	10	11	11	11	11	11	11	11	11	11	11	11	11	12	12	12	12	12	12	12	12	12	12	13	13	13	13	13

	Avg high (°C)	Avg low (°C)
1	16	10
2	16	10
3	16	10
4	16	10
5	16	11
6	16	11
7	17	11
8	17	11
9	17	11
10	17	11
11	17	11
12	17	11
13	17	11
14	17	11
15	17	11
16	17	11
17	17	12
18	18	12
19	18	12
20	18	12
21	18	12
22	18	12
23	18	12
24	18	12
25	18	12
26	18	12
27	19	13
28	19	13
29	19	13
30	19	13
31	19	13

Ermua weather by month

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

Month	High / Low (°C)	Rainfall (mm)	Wet days	Snow days	Daylight (hours)	Travel score
Jan	11° / 6°	124	15.3	0.8	9.2	2.4
Feb	11° / 6°	110	13.7	1.4	10.2	2.6
Mar	13° / 8°	105	13.3	0.5	11.6	3.5
Apr	15° / 9°	109	15.3	0.1	13.1	3.8
May	17° / 12°	93	14.3	0	14.4	5.0
Jun	20° / 14°	73	11.7	0	15.1	6.0
Jul	22° / 16°	66	10.8	0	14.9	6.6
Aug	23° / 17°	65	11.1	0	13.8	6.8
Sep	21° / 15°	75	11.6	0	12.3	6.2
Oct	18° / 13°	110	13.6	0	10.8	5.4
Nov	14° / 9°	157	15.8	0.1	9.5	3.5
Dec	12° / 7°	124	14.5	0.5	8.9	2.7

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

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

Beyond those clear spells, partly cloudy skies cover about 15% of May, with mostly cloudy or overcast conditions the remaining 63%. Skies tend to open up as the month goes on.

	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	31
Clearer (%)	35	34	33	33	34	34	34	34	35	35	35	36	35	36	37	36	38	38	39	39	39	41	41	41	41	42	42	42	41	41	41
Cloudier (%)	65	66	67	67	66	66	66	66	65	65	65	64	65	64	63	64	62	62	61	61	61	59	59	59	59	58	58	58	59	59	59

	Clearer (%)	Cloudier (%)
1	35	65
2	34	66
3	33	67
4	33	67
5	34	66
6	34	66
7	34	66
8	34	66
9	35	65
10	35	65
11	35	65
12	36	64
13	35	65
14	36	64
15	37	63
16	36	64
17	38	62
18	38	62
19	39	61
20	39	61
21	39	61
22	41	59
23	41	59
24	41	59
25	41	59
26	42	58
27	42	58
28	42	58
29	41	59
30	41	59
31	41	59

Chance of precipitation in May

Any precipitation

Ermua gets around 93 mm of rain over 14.3 wet days in May. 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 53% on the wettest days. The odds ease toward the end of the month.

	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	31
Rain chance (%)	53	53	53	52	52	52	51	51	50	49	49	48	47	46	46	45	44	44	43	43	43	42	42	42	42	42	43	43	43	44	44

	Rain chance (%)
1	53
2	53
3	53
4	52
5	52
6	52
7	51
8	51
9	50
10	49
11	49
12	48
13	47
14	46
15	46
16	45
17	44
18	44
19	43
20	43
21	43
22	42
23	42
24	42
25	42
26	42
27	43
28	43
29	43
30	44
31	44

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, May lands in the dry band about 77% 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	31
Dry (%)	93	92	92	91	90	89	88	88	87	87	86	85	85	83	82	81	79	78	76	74	73	70	68	66	63	61	59	57	55	55	53
Comfortable (%)	7	8	8	9	10	11	12	12	13	13	14	15	15	16	17	18	20	21	22	24	25	27	28	30	32	33	35	36	37	37	38
Humid (%)	0	0	0	0	0	0	0	0	0	0	0	0	0	1	1	1	1	1	2	2	2	3	4	4	5	6	6	7	8	8	9

	Dry (%)	Comfortable (%)	Humid (%)
1	93	7	0
2	92	8	0
3	92	8	0
4	91	9	0
5	90	10	0
6	89	11	0
7	88	12	0
8	88	12	0
9	87	13	0
10	87	13	0
11	86	14	0
12	85	15	0
13	85	15	0
14	83	16	1
15	82	17	1
16	81	18	1
17	79	20	1
18	78	21	1
19	76	22	2
20	74	24	2
21	73	25	2
22	70	27	3
23	68	28	4
24	66	30	4
25	63	32	5
26	61	33	6
27	59	35	6
28	57	36	7
29	55	37	8
30	55	37	8
31	53	38	9

Wind in May

Winds average 11 km/h in May.

Across May, daily wind ranges from about 10 km/h on the calmest days to 12 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	31
Wind speed (km/h)	12	12	12	12	12	12	12	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	10	10	10	10	10	10	10	10	10
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	calm

	Wind speed (km/h)	Feels
1	12	calm
2	12	calm
3	12	calm
4	12	calm
5	12	calm
6	12	calm
7	12	calm
8	11	calm
9	11	calm
10	11	calm
11	11	calm
12	11	calm
13	11	calm
14	11	calm
15	11	calm
16	11	calm
17	11	calm
18	11	calm
19	11	calm
20	11	calm
21	11	calm
22	11	calm
23	10	calm
24	10	calm
25	10	calm
26	10	calm
27	10	calm
28	10	calm
29	10	calm
30	10	calm
31	10	calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 13 h 54 min at the start of May to 14 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 60 minutes over May. Sunrise moves from 6:11 AM to 5:40 AM, and sunset from 8:03 PM to 8:35 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	31
Daylight (h)	13.9	13.9	14.0	14.0	14.0	14.1	14.1	14.2	14.2	14.2	14.3	14.3	14.4	14.4	14.4	14.5	14.5	14.5	14.6	14.6	14.6	14.7	14.7	14.7	14.8	14.8	14.8	14.8	14.9	14.9	14.9
Sunrise (AM)	6:11	6:10	6:08	6:07	6:05	6:04	6:03	6:01	6:00	5:59	5:58	5:57	5:55	5:54	5:53	5:52	5:51	5:50	5:49	5:48	5:47	5:46	5:45	5:45	5:44	5:43	5:42	5:42	5:41	5:40	5:40
Sunset (PM)	8:03	8:05	8:06	8:07	8:08	8:09	8:10	8:12	8:13	8:14	8:15	8:16	8:17	8:18	8:19	8:20	8:22	8:23	8:24	8:25	8:26	8:27	8:28	8:29	8:30	8:31	8:32	8:33	8:33	8:34	8:35

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	13.9	6:11	8:03
2	13.9	6:10	8:05
3	14.0	6:08	8:06
4	14.0	6:07	8:07
5	14.0	6:05	8:08
6	14.1	6:04	8:09
7	14.1	6:03	8:10
8	14.2	6:01	8:12
9	14.2	6:00	8:13
10	14.2	5:59	8:14
11	14.3	5:58	8:15
12	14.3	5:57	8:16
13	14.4	5:55	8:17
14	14.4	5:54	8:18
15	14.4	5:53	8:19
16	14.5	5:52	8:20
17	14.5	5:51	8:22
18	14.5	5:50	8:23
19	14.6	5:49	8:24
20	14.6	5:48	8:25
21	14.6	5:47	8:26
22	14.7	5:46	8:27
23	14.7	5:45	8:28
24	14.7	5:45	8:29
25	14.8	5:44	8:30
26	14.8	5:43	8:31
27	14.8	5:42	8:32
28	14.8	5:42	8:33
29	14.9	5:41	8:33
30	14.9	5:40	8:34
31	14.9	5:40	8:35

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.51 kWh/m².

For context, solar energy here swings from a low near 1.39 kWh/m² to a high of 5.86 kWh/m² in June across the year — May's 5.51 kWh/m² sits near the top of that range.

	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	31
Solar energy (kWh/m²)	5.1	5.1	5.1	5.2	5.2	5.2	5.2	5.3	5.3	5.3	5.3	5.4	5.4	5.4	5.5	5.5	5.5	5.6	5.6	5.6	5.6	5.7	5.7	5.7	5.7	5.7	5.7	5.7	5.7	5.7	5.7
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	Bright

	Solar energy (kWh/m²)	Level
1	5.1	Bright
2	5.1	Bright
3	5.1	Bright
4	5.2	Bright
5	5.2	Bright
6	5.2	Bright
7	5.2	Bright
8	5.3	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	5.6	Bright
22	5.7	Bright
23	5.7	Bright
24	5.7	Bright
25	5.7	Bright
26	5.7	Bright
27	5.7	Bright
28	5.7	Bright
29	5.7	Bright
30	5.7	Bright
31	5.7	Bright

Planning a trip in May

Is May a good time to visit Ermua?

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

5.0

Sightseeing

6th-best month of the year

1.4

Beach & pool

6th-best month of the year

May is a reasonable time to visit Ermua for sightseeing.

What to pack for Ermua in May

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

In May, Ermua sees daytime highs around 17°C and nights near 12°C. Pack rain gear. Worth having: sun protection. About 14 days see rain.

rain gearsun protection

Sea temperature near Ermua in May

The nearest coast averages about 16°C in May — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 23 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 3 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 Ermua in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May 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 Ermua 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	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 Ermua?

Ermua sits at 43.2°N, 2.5°W, 181 m above sea level, in Spain. The nearest listed city is Eibar, 3.0 km away.

Topography around Ermua

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

Within 3 km, the terrain around Ermua has large variations in elevation — a maximum elevation change of 661 m around an average of 352 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,295 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,497 m.

The land around Ermua is covered by trees (73%) within 3 km, trees (76%) and grassland (21%) within 16 km, and trees (44%) and water (27%) within 80 km.

3 km

661 m

trees 73%

16 km

1,295 m

trees 76%

80 km

1,497 m

trees 44%

treesshrubsgrasslandcroplandartificial surfaceswater

← April Ermua year-round climate June →Best places to visit in May

May weather nearby: Eibar 3.0 km · Durango 11 km · Arrasate / Mondragón 14 km · Amorebieta 19 km · Gernika-Lumo 21 km · Galdakao 28 km · Zarautz 29 km · Bermeo 31 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 Ermua (43.1872°, -2.5026°, elevation 181 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	10
2	16	10
3	16	10
4	16	10
5	16	11
6	16	11
7	17	11
8	17	11
9	17	11
10	17	11
11	17	11
12	17	11
13	17	11
14	17	11
15	17	11
16	17	11
17	17	12
18	18	12
19	18	12
20	18	12
21	18	12
22	18	12
23	18	12
24	18	12
25	18	12
26	18	12
27	19	13
28	19	13
29	19	13
30	19	13
31	19	13

	Clearer (%)	Cloudier (%)
1	35	65
2	34	66
3	33	67
4	33	67
5	34	66
6	34	66
7	34	66
8	34	66
9	35	65
10	35	65
11	35	65
12	36	64
13	35	65
14	36	64
15	37	63
16	36	64
17	38	62
18	38	62
19	39	61
20	39	61
21	39	61
22	41	59
23	41	59
24	41	59
25	41	59
26	42	58
27	42	58
28	42	58
29	41	59
30	41	59
31	41	59

	Rain chance (%)
1	53
2	53
3	53
4	52
5	52
6	52
7	51
8	51
9	50
10	49
11	49
12	48
13	47
14	46
15	46
16	45
17	44
18	44
19	43
20	43
21	43
22	42
23	42
24	42
25	42
26	42
27	43
28	43
29	43
30	44
31	44

	Dry (%)	Comfortable (%)	Humid (%)
1	93	7	0
2	92	8	0
3	92	8	0
4	91	9	0
5	90	10	0
6	89	11	0
7	88	12	0
8	88	12	0
9	87	13	0
10	87	13	0
11	86	14	0
12	85	15	0
13	85	15	0
14	83	16	1
15	82	17	1
16	81	18	1
17	79	20	1
18	78	21	1
19	76	22	2
20	74	24	2
21	73	25	2
22	70	27	3
23	68	28	4
24	66	30	4
25	63	32	5
26	61	33	6
27	59	35	6
28	57	36	7
29	55	37	8
30	55	37	8
31	53	38	9

	Avg high (°C)	Avg low (°C)
1	16	10
2	16	10
3	16	10
4	16	10
5	16	11
6	16	11
7	17	11
8	17	11
9	17	11
10	17	11
11	17	11
12	17	11
13	17	11
14	17	11
15	17	11
16	17	11
17	17	12
18	18	12
19	18	12
20	18	12
21	18	12
22	18	12
23	18	12
24	18	12
25	18	12
26	18	12
27	19	13
28	19	13
29	19	13
30	19	13
31	19	13

	Clearer (%)	Cloudier (%)
1	35	65
2	34	66
3	33	67
4	33	67
5	34	66
6	34	66
7	34	66
8	34	66
9	35	65
10	35	65
11	35	65
12	36	64
13	35	65
14	36	64
15	37	63
16	36	64
17	38	62
18	38	62
19	39	61
20	39	61
21	39	61
22	41	59
23	41	59
24	41	59
25	41	59
26	42	58
27	42	58
28	42	58
29	41	59
30	41	59
31	41	59

	Rain chance (%)
1	53
2	53
3	53
4	52
5	52
6	52
7	51
8	51
9	50
10	49
11	49
12	48
13	47
14	46
15	46
16	45
17	44
18	44
19	43
20	43
21	43
22	42
23	42
24	42
25	42
26	42
27	43
28	43
29	43
30	44
31	44

	Dry (%)	Comfortable (%)	Humid (%)
1	93	7	0
2	92	8	0
3	92	8	0
4	91	9	0
5	90	10	0
6	89	11	0
7	88	12	0
8	88	12	0
9	87	13	0
10	87	13	0
11	86	14	0
12	85	15	0
13	85	15	0
14	83	16	1
15	82	17	1
16	81	18	1
17	79	20	1
18	78	21	1
19	76	22	2
20	74	24	2
21	73	25	2
22	70	27	3
23	68	28	4
24	66	30	4
25	63	32	5
26	61	33	6
27	59	35	6
28	57	36	7
29	55	37	8
30	55	37	8
31	53	38	9

	Avg high (°C)	Avg low (°C)
1	16	10
2	16	10
3	16	10
4	16	10
5	16	11
6	16	11
7	17	11
8	17	11
9	17	11
10	17	11
11	17	11
12	17	11
13	17	11
14	17	11
15	17	11
16	17	11
17	17	12
18	18	12
19	18	12
20	18	12
21	18	12
22	18	12
23	18	12
24	18	12
25	18	12
26	18	12
27	19	13
28	19	13
29	19	13
30	19	13
31	19	13

	Clearer (%)	Cloudier (%)
1	35	65
2	34	66
3	33	67
4	33	67
5	34	66
6	34	66
7	34	66
8	34	66
9	35	65
10	35	65
11	35	65
12	36	64
13	35	65
14	36	64
15	37	63
16	36	64
17	38	62
18	38	62
19	39	61
20	39	61
21	39	61
22	41	59
23	41	59
24	41	59
25	41	59
26	42	58
27	42	58
28	42	58
29	41	59
30	41	59
31	41	59

	Rain chance (%)
1	53
2	53
3	53
4	52
5	52
6	52
7	51
8	51
9	50
10	49
11	49
12	48
13	47
14	46
15	46
16	45
17	44
18	44
19	43
20	43
21	43
22	42
23	42
24	42
25	42
26	42
27	43
28	43
29	43
30	44
31	44

	Dry (%)	Comfortable (%)	Humid (%)
1	93	7	0
2	92	8	0
3	92	8	0
4	91	9	0
5	90	10	0
6	89	11	0
7	88	12	0
8	88	12	0
9	87	13	0
10	87	13	0
11	86	14	0
12	85	15	0
13	85	15	0
14	83	16	1
15	82	17	1
16	81	18	1
17	79	20	1
18	78	21	1
19	76	22	2
20	74	24	2
21	73	25	2
22	70	27	3
23	68	28	4
24	66	30	4
25	63	32	5
26	61	33	6
27	59	35	6
28	57	36	7
29	55	37	8
30	55	37	8
31	53	38	9