Ruhnu weather in August

In August, Ruhnu sees average daytime highs of 19°C and overnight lows near 17°C, with 79 mm of rain across 12 wet days and about 15.1 hours of daylight. It is the 1st-warmest and 2nd-wettest month of the year here.

Highs ease over the month, from about 20°C in the first days to 18°C by the end. The sky is clear or mostly clear about 35% of the time in August, and the air most often feels comfortable.

Daylight stretches from about 16 h 12 min at the start of August to 13 h 48 min by month's end. Set against the rest of the year, August is Ruhnu's 4th-clearest and 8th-windiest month. For the whole year in context, see Ruhnu's year-round climate.

Daytime high
19°
1st warmest
Overnight low
17°
12th coldest
Rainfall
79 mm
12 wet days
Daylight
15 h 06 min
4:59 AM – 8:03 PM
Cloud cover
55%
4th clearest
Wind
22 km/h
8th windiest
Solar energy
4.65 kWh/m²
Travel score
6.0
out of 10

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 20°C in the first days to 18°C by the end.

A typical August day in Ruhnu reaches about 19°C in the afternoon and slips back to 17°C overnight — a 2°C spread between the day's warmth and the night's chill. On most days the high lands between 17°C and 22°C. Set against its neighbours, August runs on par with July and about 4°C warmer than September.

10°15°20°25°151015202531
Avg high (°C)Avg low (°C)
12018
22018
32018
42018
52018
62018
72018
82018
92018
102018
112018
122018
132018
141917
151917
161917
171917
181917
191917
201917
211917
221917
231917
241917
251817
261816
271816
281816
291816
301816
311816

How August really feels in Ruhnu

Once humidity and wind are folded in, August 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
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

August 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 August compares with the rest of the year at a glance. August is the 1st-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -2°4511.98.470.0
Feb-0° / -3°379.778.90.0
Mar / -1°338.34.511.40.0
Apr / 337.41.3140.2
May10° / 347.1016.32.4
Jun15° / 13°579.6017.74.8
Jul19° / 17°609.2017.16.4
Aug19° / 17°7912015.16.0
Sep15° / 14°6611.7012.54.5
Oct10° / 8414.90.2102.1
Nov / 6914.12.37.60.5
Dec / 5613.56.76.30.0

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 35% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 20% of August, with mostly cloudy or overcast conditions the remaining 45%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16337
26337
36337
46337
56337
66238
76238
86139
96040
106040
115941
125842
135743
145644
155545
165446
175446
185347
195248
205248
215149
225149
235149
244951
254951
264852
274852
284753
294753
304753
314654

Chance of precipitation in August

Any precipitation

Ruhnu gets around 79 mm of rain over 12 wet days in August. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 38% and peaks near 42% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202531
Rain chance (%)
133
233
334
435
535
636
736
837
937
1037
1137
1237
1338
1438
1538
1638
1739
1839
1939
2040
2140
2240
2341
2441
2541
2642
2742
2842
2942
3042
3142

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the comfortable band about 43% of days. Sticky, muggy-or-worse air turns up on roughly 6% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1173930131
2183929131
3184029121
4194029121
5204128111
6204128100
7214227100
822432790
922432680
1023442680
1124442570
1224442560
1325452460
1426452450
1526452350
1627452340
1728452340
1829452230
1930452230
2031452130
2132452120
2233442020
2335442020
2436441920
2537431810
2639431710
2740431610
2842431410
2943431310
3045421210
3146421110

Wind in August

Winds average 22 km/h in August.

Across August, daily wind ranges from about 20 km/h on the calmest days to 24 km/h at its breeziest. It stays fairly steady from day to day.

0102030151015202531
Wind speed (km/h)Feels
120breezy
220breezy
321breezy
421breezy
521breezy
621breezy
721breezy
821breezy
921breezy
1022breezy
1122breezy
1222breezy
1322breezy
1422breezy
1522breezy
1622breezy
1722breezy
1822breezy
1923breezy
2023breezy
2123breezy
2223breezy
2323breezy
2423breezy
2523breezy
2623breezy
2723breezy
2824breezy
2924breezy
3024breezy
3124breezy

Sunrise & sunset in August

DaylightNight

Daylight runs from about 16 h 12 min at the start of August to 13 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 144 minutes over August. Sunrise moves from 4:27 AM to 5:32 AM, and sunset from 8:39 PM to 7:22 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
116.24:278:39
216.14:298:37
316.14:318:35
416.04:338:33
515.94:358:30
615.84:378:28
715.84:398:26
815.74:428:23
915.64:448:21
1015.54:468:18
1115.54:488:16
1215.44:508:14
1315.34:528:11
1415.24:548:08
1515.24:578:06
1615.14:598:03
1715.05:018:01
1814.95:037:58
1914.85:057:55
2014.85:087:53
2114.75:107:50
2214.65:127:47
2314.55:147:45
2414.45:167:42
2514.35:197:39
2614.35:217:36
2714.25:237:34
2814.15:257:31
2914.05:277:28
3013.95:297:25
3113.85:327:22

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 4.65 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 — August's 4.65 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.4Bright
25.4Bright
35.3Bright
45.3Bright
55.2Bright
65.2Bright
75.1Bright
85.1Bright
95.0Bright
105.0Bright
114.9Bright
124.9Bright
134.8Bright
144.8Bright
154.7Bright
164.6Bright
174.6Bright
184.5Bright
194.5Bright
204.4Bright
214.3Bright
224.3Bright
234.2Bright
244.2Bright
254.1Bright
264.0Bright
274.0Moderate
283.9Moderate
293.9Moderate
303.8Moderate
313.8Moderate
Planning a trip in August

Is August a good time to visit Ruhnu?

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

6.0
Sightseeing
2nd-best month of the year
2.6
Beach & pool
2nd-best month of the year

August is a reasonable time to visit Ruhnu for sightseeing.

What to pack for Ruhnu in August

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

In August, Ruhnu sees daytime highs around 19°C and nights near 17°C. Worth packing: rain gear, sun protection and a windbreaker. About 12 days see rain.

rain gearsun protectiona windbreaker

Sea temperature near Ruhnu in August

The nearest coast averages about 18°C in August — 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.

0°10°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshing
Sea temperature (°C)Comfort
Jan2Bracing
Feb1Bracing
Mar1Bracing
Apr3Bracing
May7Bracing
Jun13Bracing
Jul17Cool
Aug18Cool
Sep15Cool
Oct11Bracing
Nov8Bracing
Dec5Bracing

UV index in Ruhnu in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 5 — 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowJun 19UV 6Dec 20UV 0
UV index (midday)Level
Jan0Low
Feb1Low
Mar2Low
Apr3Moderate
May4Moderate
Jun6High
Jul5Moderate
Aug5Moderate
Sep3Moderate
Oct1Low
Nov1Low
Dec0Low
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.

KuressaareMuhuPärnuVentspils

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
16 km
38 m
80 km
184 m
treesgrasslandcroplandwaterwetland
August 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
none 58%Orthodox 17%Protestant 9%other 3%

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).