Ruhnu weather in January

In January, Ruhnu sees average daytime highs of 1°C and overnight lows near -2°C, with 45 mm of precipitation across 11.9 wet days and about 7 hours of daylight. It is the 11th-warmest and 8th-wettest month of the year here.

Highs ease over the month, from about 2°C in the first days to -0°C by the end. The sky is clear or mostly clear about 7% of the time in January, and the air most often feels dry.

Daylight stretches from about 6 h 18 min at the start of January to 7 h 48 min by month's end. Set against the rest of the year, January is Ruhnu's 12th-clearest and 3rd-windiest month. For the whole year in context, see Ruhnu's year-round climate.

Daytime high
11th warmest
Overnight low
-2°
2nd coldest
Precipitation
45 mm
11.9 wet days
Daylight
6 h 54 min
9:09 AM – 4:03 PM
Cloud cover
84%
12th clearest
Wind
30 km/h
3rd windiest
Solar energy
0.4 kWh/m²
Travel score
0.0
out of 10

Temperature in January

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 2°C in the first days to -0°C by the end.

A typical January day in Ruhnu reaches about 1°C in the afternoon and slips back to -2°C overnight — a 2°C spread between the day's warmth and the night's chill. On most days the high lands between -4°C and 5°C. Set against its neighbours, January runs about 2°C cooler than December and about 1°C warmer than February.

-10°-5°10°151015202531
Avg high (°C)Avg low (°C)
12-1
22-1
32-1
42-1
51-1
61-1
71-1
81-1
91-1
101-1
111-1
121-1
131-1
141-1
151-1
161-1
171-2
181-2
191-2
200-2
210-2
220-2
230-2
240-2
250-2
260-2
270-2
280-3
290-3
300-3
310-3

How January really feels in Ruhnu

Once humidity and wind are folded in, January averages 0 days that feel above 32°C and 31 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
31
wind chill below the day's low

The story in January is cold — wind chill drags the overnight "feels like" below the raw low.

Ruhnu weather by month

How January compares with the rest of the year at a glance. January is the 11th-warmest and 8th-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 January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 7% of the time in January, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 8% of January, with mostly cloudy or overcast conditions the remaining 85%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
11882
21783
31783
41783
51684
61684
71684
81684
91585
101585
111684
121585
131585
141585
151486
161486
171486
181486
191486
201486
211486
221486
231486
241486
251486
261486
271486
281585
291684
301585
311585

Chance of precipitation in January

Any precipitationSnow

Ruhnu gets around 45 mm of rain and snow over 11.9 wet days in January. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 39% and peaks near 43% on the wettest days, and about 8 days bring snow.

0%10%20%30%40%50%151015202531
Rain chance (%)Snow chance (%)
14326
24325
34325
44325
54325
64225
74225
84225
94125
104125
114025
123925
133825
143825
153725
163725
173626
183626
193527
203527
213528
223528
233629
243629
253730
263730
273730
283830
293830
303830
313829

Humidity in January

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, January lands in the dry band about 100% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)
1100
2100
3100
4100
5100
6100
7100
8100
9100
10100
11100
12100
13100
14100
15100
16100
17100
18100
19100
20100
21100
22100
23100
24100
25100
26100
27100
28100
29100
30100
31100

Wind in January

Winds average 30 km/h in January.

Across January, daily wind ranges from about 29 km/h on the calmest days to 31 km/h at its breeziest. It stays fairly steady from day to day.

0102030151015202531
Wind speed (km/h)Feels
131windy
231windy
330windy
430windy
530windy
630windy
730windy
830windy
930windy
1030windy
1130windy
1230windy
1330windy
1430windy
1530windy
1630windy
1730windy
1830windy
1930windy
2029windy
2129windy
2229windy
2329windy
2429windy
2529windy
2629windy
2729breezy
2829breezy
2929breezy
3029breezy
3129breezy

Sunrise & sunset in January

DaylightNight

Daylight runs from about 6 h 18 min at the start of January to 7 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 90 minutes over January. Sunrise moves from 9:21 AM to 8:45 AM, and sunset from 3:40 PM to 4:35 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
16.39:213:40
26.39:203:41
36.49:203:42
46.49:203:43
56.49:193:45
66.59:193:46
76.59:183:48
86.59:173:49
96.69:163:51
106.69:163:52
116.79:153:54
126.79:143:56
136.79:133:58
146.89:123:59
156.89:114:01
166.99:094:03
177.09:084:05
187.09:074:07
197.19:054:09
207.19:044:11
217.29:034:13
227.29:014:15
237.38:594:18
247.48:584:20
257.48:564:22
267.58:554:24
277.68:534:26
287.68:514:28
297.78:494:31
307.88:474:33
317.88:454:35

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 0.4 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 — January's 0.4 kWh/m² sits near the bottom.

00.511.52151015202531
Solar energy (kWh/m²)Level
10.3Dim
20.3Dim
30.3Dim
40.3Dim
50.3Dim
60.3Dim
70.3Dim
80.3Dim
90.3Dim
100.3Dim
110.3Dim
120.3Dim
130.3Dim
140.4Dim
150.4Dim
160.4Dim
170.4Dim
180.4Dim
190.4Dim
200.4Dim
210.5Dim
220.5Dim
230.5Dim
240.5Dim
250.5Dim
260.5Dim
270.6Dim
280.6Dim
290.6Dim
300.6Dim
310.6Dim
Planning a trip in January

Is January a good time to visit Ruhnu?

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

0.0
Sightseeing
9th-best month of the year
0.0
Beach & pool
7th-best month of the year

January is a weaker month for outdoor sightseeing in Ruhnu.

What to pack for Ruhnu in January

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

In January, Ruhnu sees daytime highs around 1°C and nights near -2°C. Pack a warm layer, a heavy coat and a windbreaker. Worth having: rain gear. About 12 days see rain.

a warm layera heavy coata windbreakerrain gear

Sea temperature near Ruhnu in January

The nearest coast averages about 2°C in January — 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 January

LowModerateHighVery highExtreme

Clear-sky midday UV in January peaks around 0. 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
January 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).