Mariehamn weather in January

In January, Mariehamn sees average daytime highs of 2°C and overnight lows near -1°C, with 43 mm of precipitation across 10.5 wet days and about 6.4 hours of daylight. It is the 10th-warmest and 8th-wettest month of the year here.

Day-to-day highs hold fairly steady near 2°C through the month. The sky is clear or mostly clear about 11% of the time in January, and the air most often feels dry.

Daylight stretches from about 5 h 36 min at the start of January to 7 h 24 min by month's end. Set against the rest of the year, January is Mariehamn's 11th-clearest and 2nd-windiest month. For the whole year in context, see Mariehamn's year-round climate.

Daytime high
10th warmest
Overnight low
-1°
3rd coldest
Precipitation
43 mm
10.5 wet days
Daylight
6 h 18 min
9:40 AM – 3:59 PM
Cloud cover
79%
11th clearest
Wind
30 km/h
2nd windiest
Solar energy
0.3 kWh/m²
Travel score
0.0
out of 10

Temperature in January

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 2°C through the month.

A typical January day in Mariehamn reaches about 2°C in the afternoon and slips back to -1°C overnight — a 2°C spread between the day's warmth and the night's chill. On most days the high lands between -2°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)
120
220
320
420
520
620
720
820
920
1020
1120
1220
1320
142-1
152-1
162-1
172-1
182-1
191-1
201-1
211-1
221-1
231-1
241-1
251-1
261-1
271-1
281-2
291-2
301-2
311-2

How January really feels in Mariehamn

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.

Mariehamn weather by month

How January compares with the rest of the year at a glance. January is the 10th-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -1°4310.586.40.0
Feb / -2°297.76.58.60.0
Mar / -1°277.15.111.30.0
Apr / 296.91.714.20.0
May / 336.60.216.81.6
Jun13° / 11°497.5018.43.8
Jul17° / 15°487.6017.75.9
Aug18° / 16°5510.2015.45.8
Sep14° / 13°549.2012.64.1
Oct / 6211.80.49.81.9
Nov / 60132.97.10.4
Dec / 56136.15.60.0

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 11% of the time in January.

Beyond those clear spells, partly cloudy skies cover about 11% of January, with mostly cloudy or overcast conditions the remaining 77%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12674
22575
32476
42377
52377
62377
72377
82278
92278
102377
112377
122377
132278
142377
152377
162377
172377
182377
192377
202377
212377
222377
232179
242179
252179
262179
272179
282179
292179
302179
312179

Chance of precipitation in January

Any precipitationSnow

Mariehamn gets around 43 mm of rain and snow over 10.5 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 34% and peaks near 39% on the wettest days, and about 8 days bring snow.

0%10%20%30%40%50%151015202531
Rain chance (%)Snow chance (%)
13923
23923
33923
43823
53823
63723
73723
83623
93623
103524
113524
123424
133424
143325
153325
163225
173226
183226
193127
203127
213127
223128
233128
243229
253229
263230
273230
283330
293330
303330
313330

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 28 km/h on the calmest days to 30 km/h at its breeziest. It stays fairly steady from day to day.

0102030151015202531
Wind speed (km/h)Feels
130windy
230windy
330windy
430windy
530windy
630windy
730windy
830windy
930windy
1030windy
1130windy
1230windy
1330windy
1430windy
1530windy
1630windy
1730windy
1830windy
1930windy
2029windy
2129windy
2229windy
2329windy
2429windy
2529breezy
2629breezy
2729breezy
2829breezy
2929breezy
3028breezy
3128breezy

Sunrise & sunset in January

DaylightNight

Daylight runs from about 5 h 36 min at the start of January to 7 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 108 minutes over January. Sunrise moves from 9:55 AM to 9:12 AM, and sunset from 3:32 PM to 4:35 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
15.69:553:32
25.69:543:33
35.79:543:35
45.79:533:36
55.89:533:38
65.89:523:39
75.89:513:41
85.99:503:43
95.99:493:45
106.09:483:47
116.09:473:48
126.19:463:50
136.19:443:52
146.29:433:54
156.29:423:57
166.39:403:59
176.49:394:01
186.49:374:03
196.59:364:06
206.69:344:08
216.69:324:10
226.79:304:13
236.89:294:15
246.89:274:17
256.99:254:20
267.09:234:22
277.19:214:25
287.19:194:27
297.29:164:30
307.39:144:32
317.49:124:35

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 0.3 kWh/m².

For context, solar energy here swings from a low near 0.18 kWh/m² to a high of 6.29 kWh/m² in June across the year — January's 0.3 kWh/m² sits near the bottom.

00.511.52151015202531
Solar energy (kWh/m²)Level
10.2Dim
20.2Dim
30.2Dim
40.2Dim
50.2Dim
60.2Dim
70.2Dim
80.2Dim
90.2Dim
100.2Dim
110.3Dim
120.3Dim
130.3Dim
140.3Dim
150.3Dim
160.3Dim
170.3Dim
180.3Dim
190.3Dim
200.3Dim
210.4Dim
220.4Dim
230.4Dim
240.4Dim
250.4Dim
260.4Dim
270.5Dim
280.5Dim
290.5Dim
300.5Dim
310.5Dim
Planning a trip in January

Is January a good time to visit Mariehamn?

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

0.0
Sightseeing
8th-best month of the year
0.0
Beach & pool
5th-best month of the year

January is a weaker month for outdoor sightseeing in Mariehamn.

What to pack for Mariehamn in January

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

In January, Mariehamn sees daytime highs around 2°C and nights near -1°C. Pack a warm layer, a heavy coat and a windbreaker. Worth having: rain gear. About 11 days see rain.

a warm layera heavy coata windbreakerrain gear

Sea temperature near Mariehamn 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 17°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°5°10°15°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshing
Sea temperature (°C)Comfort
Jan2Bracing
Feb1Bracing
Mar1Bracing
Apr3Bracing
May6Bracing
Jun11Bracing
Jul16Cool
Aug17Cool
Sep14Bracing
Oct10Bracing
Nov7Bracing
Dec4Bracing

UV index in Mariehamn 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 Mariehamn peaks around June 18 at about 5 (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 4 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateModerateLowJun 18UV 5Dec 20UV 0
UV index (midday)Level
Jan0Low
Feb1Low
Mar1Low
Apr3Moderate
May4Moderate
Jun5High
Jul5Moderate
Aug4Moderate
Sep3Moderate
Oct1Low
Nov0Low
Dec0Low
Location & terrain

Where is Mariehamn?

Mariehamn sits at 60.1°N, 19.9°E, 11 m above sea level, in Aland Islands. The nearest listed city is Norrtälje, 78 km away.

Topography around Mariehamn

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

Within 3 km, the terrain around Mariehamn has only modest variations in elevation — a maximum elevation change of 55 m around an average of 7 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 80 m; within 80 km, only modest variations in elevation — a maximum elevation change of 130 m.

The land around Mariehamn is covered by water (44%) and trees (32%) within 3 km, water (55%) and trees (31%) within 16 km, and water (86%) within 80 km.

3 km
55 m
16 km
80 m
80 km
130 m
treesgrasslandcroplandartificial surfaceswaterwetland
January weather nearby: Norrtälje 78 km · Åkersberga 114 km · Vallentuna 121 km · Gustavsberg 122 km · Naantali 122 km · Boo 126 km · Täby 127 km · Märsta 128 km

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Mariehamn (60.0973°, 19.9348°, elevation 11 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).