Naantali weather in December

In December, Naantali sees average daytime highs of 1°C and overnight lows near -3°C, with 57 mm of precipitation across 12.3 wet days and about 5.5 hours of daylight. It is the 10th-warmest and 7th-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 12% of the time in December, and the air most often feels dry.

Daylight stretches from about 6 hours at the start of December to 5 h 30 min by month's end. Set against the rest of the year, December is Naantali's 11th-clearest and 1st-windiest month. For the whole year in context, see Naantali's year-round climate.

Daytime high
10th warmest
Overnight low
-3°
4th coldest
Precipitation
57 mm
12.3 wet days
Daylight
5 h 24 min
9:46 AM – 3:10 PM
Cloud cover
79%
11th clearest
Wind
17 km/h
1st windiest
Solar energy
0.16 kWh/m²
Travel score
0.0
out of 10

Temperature in December

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 December day in Naantali reaches about 1°C in the afternoon and slips back to -3°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between -5°C and 6°C. Set against its neighbours, December runs about 3°C cooler than November and about 2°C warmer than January.

-15°-10°-5°10°151015202531
Avg high (°C)Avg low (°C)
13-1
22-1
32-1
42-1
52-1
62-1
72-1
82-1
92-1
102-2
112-2
122-2
131-2
141-2
151-2
161-3
171-3
181-3
191-3
201-3
210-3
220-3
230-4
240-4
250-4
260-4
270-4
280-4
290-4
300-4
310-4

How December really feels in Naantali

Once humidity and wind are folded in, December 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
3 feel bitter (≤ -10°C)

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

Naantali weather by month

How December compares with the rest of the year at a glance. December is the 10th-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-1° / -5°4810.28.36.30.0
Feb-2° / -7°368.47.28.60.0
Mar / -4°348.25.411.30.0
Apr / 327.71.814.21.2
May13° / 398.60.116.94.0
Jun18° / 10°6210.5018.55.6
Jul21° / 13°7611.8017.86.2
Aug20° / 12°7512.2015.45.9
Sep15° / 589.7012.64.4
Oct / 62110.69.71.7
Nov / 5811.33.27.10.1
Dec / -3°5712.36.85.50.0

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 12% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 11% of December, with mostly cloudy or overcast conditions the remaining 78%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
11981
21882
31882
41783
51783
61882
71981
81981
91981
101981
112080
122179
132278
142278
152377
162476
172476
182476
192575
202575
212575
222674
232674
242674
252674
262674
272773
282773
292575
302575
312575

Chance of precipitation in December

Any precipitationSnow

Naantali gets around 57 mm of rain and snow over 12.3 wet days in December. 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 42% on the wettest days, and about 7 days bring snow.

0%10%20%30%40%50%151015202531
Rain chance (%)Snow chance (%)
14217
24217
34218
44218
54219
64219
74219
84119
94120
104120
114020
124020
134020
143921
153921
163821
173821
183822
193822
203723
213723
223724
233724
243725
253725
263725
273725
283726
293726
303726
313727

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, December 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 December

Winds average 17 km/h in December, the windiest month of the year.

Across December, daily wind ranges from about 16 km/h on the calmest days to 17 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
117light breeze
217light breeze
317light breeze
417light breeze
517light breeze
617light breeze
717light breeze
816light breeze
916light breeze
1016light breeze
1116light breeze
1216light breeze
1316light breeze
1416light breeze
1516light breeze
1616light breeze
1716light breeze
1816light breeze
1917light breeze
2017light breeze
2117light breeze
2217light breeze
2317light breeze
2417light breeze
2517light breeze
2617light breeze
2717light breeze
2817light breeze
2917light breeze
3017light breeze
3117light breeze

Sunrise & sunset in December

DaylightNight

Daylight runs from about 6 hours at the start of December to 5 h 30 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 30 minutes over December. Sunrise moves from 9:23 AM to 9:51 AM, and sunset from 3:21 PM to 3:19 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
16.09:233:21
25.99:253:19
35.99:273:18
45.89:293:17
55.89:303:16
65.79:323:15
75.79:343:14
85.69:363:13
95.69:373:13
105.69:393:12
115.59:403:11
125.59:423:11
135.59:433:11
145.49:443:10
155.49:453:10
165.49:463:10
175.49:473:10
185.49:483:10
195.49:493:10
205.39:493:10
215.39:503:11
225.39:513:11
235.39:513:12
245.39:513:12
255.49:523:13
265.49:523:14
275.49:523:15
285.49:523:16
295.49:523:17
305.49:513:18
315.59:513:19

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 0.16 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 0.16 kWh/m² to a high of 5.97 kWh/m² in June across the year — December's 0.16 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
110.2Dim
120.1Dim
130.1Dim
140.1Dim
150.1Dim
160.1Dim
170.1Dim
180.1Dim
190.1Dim
200.1Dim
210.1Dim
220.1Dim
230.1Dim
240.1Dim
250.2Dim
260.2Dim
270.2Dim
280.2Dim
290.2Dim
300.2Dim
310.2Dim
Planning a trip in December

Is December a good time to visit Naantali?

Our two travel scores rate December 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
6th-best month of the year

December is a weaker month for outdoor sightseeing in Naantali.

What to pack for Naantali in December

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

In December, Naantali sees daytime highs around 1°C and nights near -3°C. Pack a warm layer and a heavy coat. Worth having: rain gear. About 12 days see rain.

a warm layera heavy coatrain gear

Sea temperature near Naantali in December

The nearest coast averages about 4°C in December — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 24 km away) is warmest in August at about 17°C and coldest in March 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
Apr2Bracing
May6Bracing
Jun11Bracing
Jul16Cool
Aug17Cool
Sep14Bracing
Oct10Bracing
Nov7Bracing
Dec4Bracing

UV index in Naantali in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 0. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Naantali peaks around June 16 at about 5 (high) — a little sun protection helps at midday. It bottoms out near December 19 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 16UV 5Dec 19UV 0
UV index (midday)Level
Jan0Low
Feb1Low
Mar2Low
Apr3Moderate
May4Moderate
Jun5High
Jul4Moderate
Aug4Moderate
Sep2Moderate
Oct1Low
Nov0Low
Dec0Low
Location & terrain

Where is Naantali?

Naantali sits at 60.5°N, 22.0°E, 9 m above sea level, in Finland. The nearest listed city is Raisio, 8.0 km away.

LoimaaRauma

Topography around Naantali

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

Within 3 km, the terrain around Naantali has only modest variations in elevation — a maximum elevation change of 49 m around an average of 13 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 73 m; within 80 km, significant variations in elevation — a maximum elevation change of 263 m.

The land around Naantali is covered by trees (45%) and water (28%) within 3 km, trees (48%) and water (25%) within 16 km, and water (43%) and trees (41%) within 80 km.

3 km
49 m
16 km
73 m
80 km
263 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
December weather nearby: Raisio 8.0 km · Turku 14 km · Kaarina 20 km · Väståboland 24 km · Lieto 24 km · Salo 62 km · Loimaa 70 km · Rauma 78 km

Finland travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type C / F
230 V · 50 Hz
Prices
≈ 85% of US
price level, 2025
GDP per capita
$56,149
2025
Happiness
7.8 / 10
World Happiness, 2025
Safe drinking water
100%
of population, 2024
Homicide rate
1
per 100k, 2023
Road deaths
3.9
per 100k/yr, 2019
Income group
High
World Bank
English
Very high
EF EPI 603
Religion
Lutheran 67%none 31%other 2%Greek Orthodox 1%

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 Naantali (60.4674°, 22.0243°, elevation 9 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).