Ruhnu weather in May

In May, Ruhnu sees average daytime highs of 10°C and overnight lows near 8°C, with 34 mm of rain across 7.1 wet days and about 16.3 hours of daylight. It is the 6th-warmest and 10th-wettest month of the year here.

Highs climb over the month, from about 7°C in the first days to 12°C by the end. The sky is clear or mostly clear about 42% of the time in May, and the air most often feels dry.

Daylight stretches from about 15 h 12 min at the start of May to 17 h 12 min by month's end. Set against the rest of the year, May is Ruhnu's 1st-clearest and 12th-windiest month. For the whole year in context, see Ruhnu's year-round climate.

Daytime high: 10°; 6th warmest
Overnight low: 8°; 7th coldest
Rainfall: 34 mm; 7.1 wet days
Daylight: 16 h 18 min; 4:13 AM – 8:34 PM
Cloud cover: 50%; 1st clearest
Wind: 20 km/h; 12th windiest
Solar energy: 5.88 kWh/m²
Travel score: 2.4; out of 10

← April Ruhnu 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 7°C in the first days to 12°C by the end.

A typical May day in Ruhnu reaches about 10°C in the afternoon and slips back to 8°C overnight — a 2°C spread between the day's warmth and the night's chill. On most days the high lands between 7°C and 13°C. Set against its neighbours, May runs about 5°C warmer than April and about 5°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)	7	7	7	8	8	8	8	8	8	9	9	9	9	9	10	10	10	10	10	11	11	11	11	12	12	12	12	12	13	13	13
Avg low (°C)	5	5	5	5	6	6	6	6	6	6	7	7	7	7	7	8	8	8	8	9	9	9	9	9	10	10	10	10	10	11	11

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

How May really feels in Ruhnu

Once humidity and wind are folded in, May 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

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

Ruhnu weather by month

How May compares with the rest of the year at a glance. May is the 6th-warmest and 10th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Snow days	Daylight (hours)	Travel score
Jan	1° / -2°	45	11.9	8.4	7	0.0
Feb	-0° / -3°	37	9.7	7	8.9	0.0
Mar	1° / -1°	33	8.3	4.5	11.4	0.0
Apr	5° / 3°	33	7.4	1.3	14	0.2
May	10° / 8°	34	7.1	0	16.3	2.4
Jun	15° / 13°	57	9.6	0	17.7	4.8
Jul	19° / 17°	60	9.2	0	17.1	6.4
Aug	19° / 17°	79	12	0	15.1	6.0
Sep	15° / 14°	66	11.7	0	12.5	4.5
Oct	10° / 9°	84	14.9	0.2	10	2.1
Nov	6° / 4°	69	14.1	2.3	7.6	0.5
Dec	3° / 1°	56	13.5	6.7	6.3	0.0

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 42% of the time in May, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 15% of May, with mostly cloudy or overcast conditions the remaining 42%.

	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 (%)	58	58	59	58	58	58	58	59	58	59	58	58	58	57	57	57	57	57	56	56	56	57	57	57	57	57	57	58	58	58	59
Cloudier (%)	42	42	41	42	42	42	42	41	42	41	42	42	42	43	43	43	43	43	44	44	44	43	43	43	43	43	43	42	42	42	41

	Clearer (%)	Cloudier (%)
1	58	42
2	58	42
3	59	41
4	58	42
5	58	42
6	58	42
7	58	42
8	59	41
9	58	42
10	59	41
11	58	42
12	58	42
13	58	42
14	57	43
15	57	43
16	57	43
17	57	43
18	57	43
19	56	44
20	56	44
21	56	44
22	57	43
23	57	43
24	57	43
25	57	43
26	57	43
27	57	43
28	58	42
29	58	42
30	58	42
31	59	41

Chance of precipitation in May

Any precipitation

Ruhnu gets around 34 mm of rain over 7.1 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 23% and peaks near 26% 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	31
Rain chance (%)	20	20	20	20	20	20	20	20	21	21	21	22	22	22	23	23	24	24	24	25	25	25	26	26	26	26	26	25	25	25	25

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

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 98% 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 (%)	100	100	100	100	100	100	100	100	100	100	100	100	100	99	99	99	99	99	99	99	98	98	97	97	97	96	95	95	94	93	92
Comfortable (%)	0	0	0	0	0	0	0	0	0	0	0	0	0	1	1	1	1	1	1	1	2	2	3	3	3	4	5	5	6	7	8

	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	99	1
15	99	1
16	99	1
17	99	1
18	99	1
19	99	1
20	99	1
21	98	2
22	98	2
23	97	3
24	97	3
25	97	3
26	96	4
27	95	5
28	95	5
29	94	6
30	93	7
31	92	8

Wind in May

Winds average 20 km/h in May, the calmest month.

Across May, daily wind ranges from about 20 km/h on the calmest days to 21 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)	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	20	21	21	21	21	21	21
Feels	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy	breezy

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

Sunrise & sunset in May

DaylightNight

Daylight runs from about 15 h 12 min at the start of May to 17 h 12 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 120 minutes over May. Sunrise moves from 4:47 AM to 3:48 AM, and sunset from 8:01 PM to 9:01 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)	15.2	15.3	15.4	15.5	15.5	15.6	15.7	15.8	15.8	15.9	16.0	16.1	16.1	16.2	16.3	16.3	16.4	16.5	16.5	16.6	16.7	16.7	16.8	16.9	16.9	17.0	17.0	17.1	17.1	17.2	17.2
Sunrise (AM)	4:47	4:45	4:42	4:40	4:37	4:35	4:33	4:30	4:28	4:26	4:24	4:21	4:19	4:17	4:15	4:13	4:11	4:09	4:07	4:05	4:03	4:02	4:00	3:58	3:56	3:55	3:53	3:52	3:50	3:49	3:48
Sunset (PM)	8:01	8:03	8:06	8:08	8:10	8:12	8:14	8:17	8:19	8:21	8:23	8:25	8:27	8:29	8:31	8:34	8:36	8:38	8:40	8:42	8:43	8:45	8:47	8:49	8:51	8:53	8:55	8:56	8:58	9:00	9:01

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	15.2	4:47	8:01
2	15.3	4:45	8:03
3	15.4	4:42	8:06
4	15.5	4:40	8:08
5	15.5	4:37	8:10
6	15.6	4:35	8:12
7	15.7	4:33	8:14
8	15.8	4:30	8:17
9	15.8	4:28	8:19
10	15.9	4:26	8:21
11	16.0	4:24	8:23
12	16.1	4:21	8:25
13	16.1	4:19	8:27
14	16.2	4:17	8:29
15	16.3	4:15	8:31
16	16.3	4:13	8:34
17	16.4	4:11	8:36
18	16.5	4:09	8:38
19	16.5	4:07	8:40
20	16.6	4:05	8:42
21	16.7	4:03	8:43
22	16.7	4:02	8:45
23	16.8	4:00	8:47
24	16.9	3:58	8:49
25	16.9	3:56	8:51
26	17.0	3:55	8:53
27	17.0	3:53	8:55
28	17.1	3:52	8:56
29	17.1	3:50	8:58
30	17.2	3:49	9:00
31	17.2	3:48	9:01

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.88 kWh/m².

For context, solar energy here swings from a low near 0.26 kWh/m² to a high of 6.22 kWh/m² in June across the year — May's 5.88 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)	5.3	5.4	5.4	5.5	5.5	5.6	5.6	5.6	5.7	5.7	5.8	5.8	5.8	5.8	5.9	5.9	5.9	5.9	6.0	6.0	6.0	6.0	6.1	6.1	6.1	6.1	6.2	6.2	6.2	6.2	6.2
Level	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense

	Solar energy (kWh/m²)	Level
1	5.3	Bright
2	5.4	Bright
3	5.4	Bright
4	5.5	Bright
5	5.5	Bright
6	5.6	Bright
7	5.6	Bright
8	5.6	Bright
9	5.7	Bright
10	5.7	Bright
11	5.8	Bright
12	5.8	Bright
13	5.8	Bright
14	5.8	Bright
15	5.9	Bright
16	5.9	Bright
17	5.9	Bright
18	5.9	Bright
19	6.0	Bright
20	6.0	Bright
21	6.0	Intense
22	6.0	Intense
23	6.1	Intense
24	6.1	Intense
25	6.1	Intense
26	6.1	Intense
27	6.2	Intense
28	6.2	Intense
29	6.2	Intense
30	6.2	Intense
31	6.2	Intense

Planning a trip in May

Is May a good time to visit Ruhnu?

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

2.4

Sightseeing

5th-best month of the year

0.0

Beach & pool

6th-best month of the year

May is a weaker month for outdoor sightseeing in Ruhnu.

What to pack for Ruhnu in May

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

In May, Ruhnu sees daytime highs around 10°C and nights near 8°C. Pack a warm layer. Worth having: sun protection and a windbreaker. About 7 days see rain.

a warm layersun protectiona windbreaker

Sea temperature near Ruhnu in May

The nearest coast averages about 7°C in May — 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 18°C and coldest in February near 1°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)	2	1	1	3	7	13	17	18	15	11	8	5
Comfort	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Cool	Cool	Cool	Bracing	Bracing	Bracing

	Sea temperature (°C)	Comfort
Jan	2	Bracing
Feb	1	Bracing
Mar	1	Bracing
Apr	3	Bracing
May	7	Bracing
Jun	13	Bracing
Jul	17	Cool
Aug	18	Cool
Sep	15	Cool
Oct	11	Bracing
Nov	8	Bracing
Dec	5	Bracing

UV index in Ruhnu in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 4 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Ruhnu peaks around June 19 at about 6 (high) — a little sun protection helps at midday. It bottoms out near December 20 at about 0 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 5 months of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	0	1	2	3	4	6	5	5	3	1	1	0
Level	Low	Low	Low	Moderate	Moderate	High	Moderate	Moderate	Moderate	Low	Low	Low

	UV index (midday)	Level
Jan	0	Low
Feb	1	Low
Mar	2	Low
Apr	3	Moderate
May	4	Moderate
Jun	6	High
Jul	5	Moderate
Aug	5	Moderate
Sep	3	Moderate
Oct	1	Low
Nov	1	Low
Dec	0	Low

Location & terrain

Where is Ruhnu?

Ruhnu sits at 57.8°N, 23.2°E, 0 m above sea level, in Estonia. The nearest listed city is Kuressaare, 67 km away.

Topography around Ruhnu

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

Within 3 km, the terrain around Ruhnu has only modest variations in elevation — a maximum elevation change of 38 m around an average of 4 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 38 m; within 80 km, only modest variations in elevation — a maximum elevation change of 184 m.

The land around Ruhnu is covered by water (63%) and trees (23%) within 3 km, water (99%) within 16 km, and water (70%) and trees (21%) within 80 km.

3 km

38 m

water 63%

16 km

38 m

water 99%

80 km

184 m

water 70%

treesgrasslandcroplandwaterwetland

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

May weather nearby: Kuressaare 67 km · Muhu 89 km · Tukums 93 km · Jūrmala 98 km · Pärnu 98 km · Riga 108 km · Dārzciems 110 km · Ventspils 110 km

Estonia travel facts

Travel advisory: Level 1; Exercise Normal Precautions
Power plugs: Type C / F; 230 V · 50 Hz
Prices: ≈ 66% of US; price level, 2025
GDP per capita: $34,418; 2025
Happiness: 6.4 / 10; World Happiness, 2025
Safe drinking water: 99%; of population, 2024
Homicide rate: 1.5; per 100k, 2023
Road deaths: 4.5; per 100k/yr, 2019
Income group: High; World Bank
English: High; EF EPI 561
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 Ruhnu (57.8003°, 23.2483°, 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	7	5
2	7	5
3	7	5
4	8	5
5	8	6
6	8	6
7	8	6
8	8	6
9	8	6
10	9	6
11	9	7
12	9	7
13	9	7
14	9	7
15	10	7
16	10	8
17	10	8
18	10	8
19	10	8
20	11	9
21	11	9
22	11	9
23	11	9
24	12	9
25	12	10
26	12	10
27	12	10
28	12	10
29	13	10
30	13	11
31	13	11

	Clearer (%)	Cloudier (%)
1	58	42
2	58	42
3	59	41
4	58	42
5	58	42
6	58	42
7	58	42
8	59	41
9	58	42
10	59	41
11	58	42
12	58	42
13	58	42
14	57	43
15	57	43
16	57	43
17	57	43
18	57	43
19	56	44
20	56	44
21	56	44
22	57	43
23	57	43
24	57	43
25	57	43
26	57	43
27	57	43
28	58	42
29	58	42
30	58	42
31	59	41

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

	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	99	1
15	99	1
16	99	1
17	99	1
18	99	1
19	99	1
20	99	1
21	98	2
22	98	2
23	97	3
24	97	3
25	97	3
26	96	4
27	95	5
28	95	5
29	94	6
30	93	7
31	92	8

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

	Clearer (%)	Cloudier (%)
1	58	42
2	58	42
3	59	41
4	58	42
5	58	42
6	58	42
7	58	42
8	59	41
9	58	42
10	59	41
11	58	42
12	58	42
13	58	42
14	57	43
15	57	43
16	57	43
17	57	43
18	57	43
19	56	44
20	56	44
21	56	44
22	57	43
23	57	43
24	57	43
25	57	43
26	57	43
27	57	43
28	58	42
29	58	42
30	58	42
31	59	41

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

	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	99	1
15	99	1
16	99	1
17	99	1
18	99	1
19	99	1
20	99	1
21	98	2
22	98	2
23	97	3
24	97	3
25	97	3
26	96	4
27	95	5
28	95	5
29	94	6
30	93	7
31	92	8

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

	Clearer (%)	Cloudier (%)
1	58	42
2	58	42
3	59	41
4	58	42
5	58	42
6	58	42
7	58	42
8	59	41
9	58	42
10	59	41
11	58	42
12	58	42
13	58	42
14	57	43
15	57	43
16	57	43
17	57	43
18	57	43
19	56	44
20	56	44
21	56	44
22	57	43
23	57	43
24	57	43
25	57	43
26	57	43
27	57	43
28	58	42
29	58	42
30	58	42
31	59	41

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

	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	99	1
15	99	1
16	99	1
17	99	1
18	99	1
19	99	1
20	99	1
21	98	2
22	98	2
23	97	3
24	97	3
25	97	3
26	96	4
27	95	5
28	95	5
29	94	6
30	93	7
31	92	8