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December

Viana do Castelo Weather in December with Sea Temperature

December weather in Viana do Castelo includes average daytime air +14°C, nighttime +9°C, average sea temperature +15°C. Daily water temperatures usually range from +14°C to +15°C, which is cool for long swims. The tables below also show air temperature, wind, rain and humidity; for near-term water data, open the current 30-day water temperature forecast.

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Averaged values across several years

Daily air temperature for the month

Day Night

Daily sea water temperature for the month

Water

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December	Day	Night	Sea t°	Wind	Precip	Humidity
1Mon	+15°C	+9°C	+15°C	3 m/s	0.4 mm	78%
2Tue	+14°C	+8°C	+15°C	4 m/s	0.5 mm	75%
3Wed	+13°C	+7°C	+15°C	4 m/s	0.8 mm	78%
4Thu	+14°C	+9°C	+15°C	5 m/s	1.3 mm	80%
5Fri	+14°C	+10°C	+15°C	4 m/s	0.6 mm	81%
6Sat	+14°C	+10°C	+15°C	3 m/s	1.2 mm	85%
7Sun	+15°C	+11°C	+15°C	6 m/s	3.4 mm	85%
8Mon	+14°C	+10°C	+15°C	7 m/s	1.2 mm	79%
9Tue	+14°C	+10°C	+15°C	6 m/s	1.5 mm	86%
10Wed	+14°C	+10°C	+15°C	4 m/s	1 mm	85%
11Thu	+14°C	+10°C	+15°C	5 m/s	1.2 mm	85%
12Fri	+14°C	+10°C	+15°C	4 m/s	3.3 mm	85%
13Sat	+15°C	+10°C	+15°C	4 m/s	1.8 mm	84%
14Sun	+15°C	+10°C	+15°C	4 m/s	1.3 mm	79%
15Mon	+14°C	+9°C	+15°C	3 m/s	1.3 mm	75%
16Tue	+14°C	+8°C	+15°C	4 m/s	2.4 mm	73%
17Wed	+15°C	+9°C	+15°C	3 m/s	0 mm	72%
18Thu	+14°C	+10°C	+15°C	6 m/s	1.7 mm	77%
19Fri	+14°C	+9°C	+15°C	6 m/s	2.6 mm	77%
20Sat	+13°C	+9°C	+15°C	5 m/s	3.5 mm	81%
21Sun	+14°C	+10°C	+15°C	5 m/s	2.2 mm	84%
22Mon	+16°C	+11°C	+15°C	5 m/s	0.6 mm	85%
23Tue	+14°C	+10°C	+14°C	5 m/s	1.1 mm	83%
24Wed	+14°C	+9°C	+14°C	5 m/s	1.7 mm	78%
25Thu	+14°C	+9°C	+14°C	4 m/s	1.3 mm	79%
26Fri	+14°C	+8°C	+14°C	3 m/s	1.1 mm	79%
27Sat	+14°C	+9°C	+14°C	4 m/s	0.6 mm	80%
28Sun	+14°C	+10°C	+14°C	5 m/s	2 mm	84%
29Mon	+13°C	+10°C	+14°C	4 m/s	1.6 mm	86%
30Tue	+14°C	+10°C	+15°C	4 m/s	1.2 mm	83%
31Wed	+14°C	+9°C	+15°C	5 m/s	1.3 mm	74%

Sea water temperature by months

Water +15°C

Day and night air temperature

Day +14°C Night +9°C

Weather highs and lows in Viana do Castelo for december

Warmest day: 22 december, +16°C
Coldest night: 3 december, +7°C
Max precipitation: 20 december, 3.5 mm
Warmest sea water: 1 december, +15°C
Coldest sea water: 23 december, +14°C

Climate in Viana do Castelo in december

Average daytime temperature: +14°C
Average nighttime temperature: +9°C
Sea water temperature: —
Precipitation (monthly average): 45.5 mm
Days with precipitation: 11.5
Humidity: 81%
Wind: 5 m/s
Data: 6 years / coverage 100%

Daily air temperature for the month

Day Night

Tap a date to open detailed weather for that day

December	Day	Night	Sea t°	Wind	Precip	Humidity
1Mon	+12°C	+7°C	—	4-7 m/s, SSE	1.5 mm	76%
2Tue	+13°C	+8°C	—	4-5 m/s, WNW	2.6 mm	78%
3Wed	+13°C	+6°C	—	4-6 m/s, SSE	1 mm	79%
4Thu	+14°C	+12°C	—	5-6 m/s, W	0.4 mm	80%
5Fri	+16°C	+12°C	—	4-6 m/s, WSW	2.1 mm	92%
6Sat	+16°C	+15°C	—	6-7 m/s, SSW	4.7 mm	94%
7Sun	+16°C	+14°C	—	6-7 m/s, SSE	0.6 mm	87%
8Mon	+16°C	+12°C	—	8-10 m/s, SSE	0 mm	85%
9Tue	+16°C	+13°C	—	9-12 m/s, SSE	3.1 mm	85%
10Wed	+14°C	+9°C	—	2-4 m/s, N	0.1 mm	84%
11Thu	+14°C	+9°C	—	5-6 m/s, SSE	0.3 mm	84%
12Fri	+11°C	+8°C	—	5-6 m/s, N	4.8 mm	88%
13Sat	+16°C	+9°C	—	3-5 m/s, NNE	0.1 mm	82%
14Sun	+15°C	+9°C	—	2 m/s, ESE	0 mm	74%
15Mon	+12°C	+11°C	—	4-7 m/s, S	2.9 mm	85%
16Tue	+13°C	+9°C	—	8-10 m/s, N	0.2 mm	80%
17Wed	+13°C	+7°C	—	2-4 m/s, SE	0 mm	77%
18Thu	+13°C	+10°C	—	7-9 m/s, S	6 mm	84%
19Fri	+12°C	+8°C	—	6-8 m/s, N	0.7 mm	80%
20Sat	+12°C	+7°C	—	5-9 m/s, WNW	7.6 mm	81%
21Sun	+10°C	+6°C	—	5-6 m/s, NNW	2 mm	74%
22Mon	+12°C	+7°C	—	5-9 m/s, NW	1.6 mm	78%
23Tue	+13°C	+8°C	—	3-4 m/s, N	1.6 mm	87%
24Wed	+13°C	+7°C	—	3-4 m/s, NNE	0 mm	78%
25Thu	+10°C	+5°C	—	4-6 m/s, NNE	0 mm	75%
26Fri	+10°C	+4°C	—	3-4 m/s, SE	0 mm	68%
27Sat	+13°C	+5°C	—	4 m/s, E	0 mm	67%
28Sun	+14°C	+8°C	—	2-3 m/s, ENE	0 mm	73%
29Mon	+13°C	+8°C	—	1-2 m/s, SE	0 mm	74%
30Tue	+13°C	+8°C	—	2 m/s, SE	0 mm	80%
31Wed	+13°C	+6°C	—	1-2 m/s, SE	0 mm	75%

Weather highs and lows in Viana do Castelo for december

Warmest day: 5 december, +16°C
Coldest night: 26 december, +4°C
Max precipitation: 20 december, 7.6 mm
Warmest water: —
Coldest water: —

Climate in Viana do Castelo in december

Year: 2025
Average daytime temperature: +13°C
Average nighttime temperature: +9°C
Water temperature: —
Precipitation (month): 43.9 mm
Days with precipitation: 13
Humidity: 80%
Wind: 4 m/s

Daily air temperature for the month

Day Night

Daily sea water temperature for the month

Water

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December	Day	Night	Sea t°	Wind	Precip	Humidity
1Sun	+17°C	+14°C	+15°C	3-4 m/s, SSE	0.3 mm	86%
2Mon	+15°C	+11°C	+15°C	4-5 m/s, N	0 mm	86%
3Tue	+14°C	+9°C	+15°C	4 m/s, NNW	0.5 mm	80%
4Wed	+17°C	+11°C	+15°C	2-3 m/s, N	0 mm	88%
5Thu	+16°C	+12°C	+15°C	1-2 m/s, S	0.2 mm	83%
6Fri	+17°C	+12°C	+15°C	2 m/s, SSE	0 mm	91%
7Sat	+15°C	+10°C	+15°C	7-9 m/s, N	0.2 mm	77%
8Sun	+13°C	+9°C	+15°C	8 m/s, N	0 mm	67%
9Mon	+13°C	+8°C	+15°C	6-7 m/s, N	0 mm	70%
10Tue	+13°C	+7°C	+15°C	4-5 m/s, NNE	0 mm	75%
11Wed	+12°C	+6°C	+15°C	3-4 m/s, E	0 mm	68%
12Thu	+12°C	+7°C	+15°C	3-4 m/s, SSE	0 mm	66%
13Fri	+12°C	+7°C	+15°C	3-4 m/s, SE	0 mm	73%
14Sat	+14°C	+10°C	+15°C	3-4 m/s, ESE	0 mm	72%
15Sun	+14°C	+7°C	+15°C	2 m/s, ESE	0 mm	61%
16Mon	+14°C	+8°C	+15°C	4 m/s, ESE	0 mm	65%
17Tue	+17°C	+10°C	+15°C	6-7 m/s, SE	0 mm	60%
18Wed	+16°C	+14°C	+15°C	8-10 m/s, S	2.5 mm	89%
19Thu	+16°C	+8°C	+15°C	7-8 m/s, N	1.2 mm	82%
20Fri	+12°C	+6°C	+15°C	5-6 m/s, NNE	0 mm	73%
21Sat	+14°C	+7°C	+15°C	3-4 m/s, NNE	0 mm	77%
22Sun	+16°C	+10°C	+15°C	5-6 m/s, N	0 mm	84%
23Mon	+14°C	+8°C	+14°C	6-7 m/s, NNE	0 mm	73%
24Tue	+15°C	+8°C	+14°C	2-3 m/s, ENE	0 mm	70%
25Wed	+16°C	+10°C	+14°C	2-3 m/s, ENE	0 mm	75%
26Thu	+16°C	+9°C	+14°C	1-2 m/s, NE	0 mm	79%
27Fri	+15°C	+10°C	+14°C	1-2 m/s, SSE	0 mm	75%
28Sat	+14°C	+9°C	+14°C	2 m/s, SSE	0 mm	79%
29Sun	+13°C	+8°C	+14°C	1-2 m/s, SSW	0 mm	84%
30Mon	+13°C	+7°C	+15°C	2 m/s, SE	0 mm	78%
31Tue	+13°C	+7°C	+15°C	2-3 m/s, SE	0 mm	68%

Weather highs and lows in Viana do Castelo for december

Warmest day: 1 december, +17°C
Coldest night: 11 december, +6°C
Max precipitation: 18 december, 2.5 mm
Warmest water: 1 december, +15°C
Coldest water: 23 december, +14°C

Climate in Viana do Castelo in december

Year: 2024
Average daytime temperature: +15°C
Average nighttime temperature: +9°C
Water temperature: —
Precipitation (month): 4.9 mm
Days with precipitation: 2
Humidity: 76%
Wind: 4 m/s

Daily air temperature for the month

Day Night

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December	Day	Night	Sea t°	Wind	Precip	Humidity
1Fri	+13°C	+8°C	—	4-5 m/s, NNW	0.4 mm	76%
2Sat	+13°C	+7°C	—	2-3 m/s, NNW	0 mm	78%
3Sun	+13°C	+8°C	—	6-10 m/s, SSE	2.9 mm	81%
4Mon	+14°C	+9°C	—	5-6 m/s, NW	1.3 mm	80%
5Tue	+11°C	+7°C	—	2-3 m/s, ESE	0 mm	72%
6Wed	+12°C	+6°C	—	3-5 m/s, SSE	0 mm	70%
7Thu	+16°C	+11°C	—	6-10 m/s, SSW	15.6 mm	92%
8Fri	+15°C	+11°C	—	4-6 m/s, WSW	0.6 mm	82%
9Sat	+16°C	+12°C	—	5-6 m/s, S	3 mm	95%
10Sun	+16°C	+15°C	—	5-6 m/s, S	0.9 mm	95%
11Mon	+16°C	+14°C	—	6-7 m/s, S	0.3 mm	93%
12Tue	+15°C	+12°C	—	5-6 m/s, WSW	5.1 mm	92%
13Wed	+13°C	+10°C	—	6 m/s, NNW	0.4 mm	78%
14Thu	+14°C	+8°C	—	4-5 m/s, NNE	0 mm	76%
15Fri	+15°C	+8°C	—	2-3 m/s, E	0 mm	75%
16Sat	+15°C	+7°C	—	2-3 m/s, ENE	0 mm	65%
17Sun	+14°C	+8°C	—	1-2 m/s, SSE	0 mm	64%
18Mon	+13°C	+7°C	—	2 m/s, NNE	0 mm	64%
19Tue	+12°C	+7°C	—	2 m/s, NW	0 mm	69%
20Wed	+13°C	+9°C	—	6-8 m/s, N	0.1 mm	78%
21Thu	+14°C	+9°C	—	5 m/s, N	0 mm	84%
22Fri	+16°C	+9°C	—	5 m/s, NNE	0 mm	72%
23Sat	+14°C	+8°C	—	2-3 m/s, SSE	0 mm	65%
24Sun	+13°C	+8°C	—	2 m/s, SSE	0 mm	68%
25Mon	+13°C	+9°C	—	2 m/s, SSE	0 mm	72%
26Tue	+14°C	+9°C	—	3-4 m/s, SSE	0 mm	79%
27Wed	+13°C	+10°C	—	6-8 m/s, SSE	0.3 mm	83%
28Thu	+13°C	+12°C	—	7-9 m/s, S	8.5 mm	91%
29Fri	+13°C	+12°C	—	4-6 m/s, S	3.6 mm	95%
30Sat	+14°C	+11°C	—	4-5 m/s, S	0.2 mm	87%
31Sun	+13°C	+10°C	—	5-8 m/s, NW	3.7 mm	72%

Weather highs and lows in Viana do Castelo for december

Warmest day: 7 december, +16°C
Coldest night: 6 december, +6°C
Max precipitation: 7 december, 15.6 mm
Warmest water: —
Coldest water: —

Climate in Viana do Castelo in december

Year: 2023
Average daytime temperature: +14°C
Average nighttime temperature: +9°C
Water temperature: —
Precipitation (month): 46.9 mm
Days with precipitation: 8
Humidity: 79%
Wind: 4 m/s

Daily air temperature for the month

Day Night

Tap a date to open detailed weather for that day

December	Day	Night	Sea t°	Wind	Precip	Humidity
1Thu	+16°C	+8°C	—	2 m/s, ENE	0 mm	80%
2Fri	+15°C	+6°C	—	3-4 m/s, SE	0 mm	63%
3Sat	+15°C	+6°C	—	2-3 m/s, ENE	0 mm	63%
4Sun	+12°C	+5°C	—	2-3 m/s, SE	0.4 mm	72%
5Mon	+13°C	+9°C	—	4 m/s, SE	0 mm	83%
6Tue	+15°C	+11°C	—	2 m/s, SE	0.2 mm	82%
7Wed	+15°C	+10°C	—	3 m/s, ESE	0 mm	82%
8Thu	+15°C	+11°C	—	5-6 m/s, SE	4.1 mm	88%
9Fri	+13°C	+10°C	—	3-5 m/s, E	0.7 mm	92%
10Sat	+12°C	+7°C	—	4-5 m/s, N	0 mm	69%
11Sun	+10°C	+6°C	—	3-4 m/s, NNE	3.9 mm	84%
12Mon	+17°C	+10°C	—	7-9 m/s, SSW	10.1 mm	92%
13Tue	+16°C	+14°C	—	5-6 m/s, S	7.8 mm	96%
14Wed	+15°C	+12°C	—	7-9 m/s, SSW	6.1 mm	88%
15Thu	+13°C	+11°C	—	4-5 m/s, SSE	1.7 mm	87%
16Fri	+14°C	+10°C	—	3-5 m/s, E	2.6 mm	78%
17Sat	+14°C	+10°C	—	3-5 m/s, SSE	0.3 mm	84%
18Sun	+15°C	+11°C	—	8-10 m/s, SSE	0 mm	81%
19Mon	+15°C	+14°C	—	10-11 m/s, S	10.3 mm	85%
20Tue	+16°C	+12°C	—	7-9 m/s, SW	11.2 mm	91%
21Wed	+16°C	+13°C	—	5-6 m/s, SSW	1.3 mm	91%
22Thu	+17°C	+15°C	—	5-7 m/s, S	1.1 mm	97%
23Fri	+16°C	+14°C	—	8-9 m/s, S	0.8 mm	94%
24Sat	+16°C	+14°C	—	9 m/s, S	8.3 mm	90%
25Sun	+15°C	+13°C	—	7-10 m/s, S	6.1 mm	87%
26Mon	+14°C	+11°C	—	2-3 m/s, SE	0.3 mm	86%
27Tue	+14°C	+9°C	—	1-2 m/s, S	0 mm	88%
28Wed	+14°C	+10°C	—	4 m/s, SSW	0.8 mm	90%
29Thu	+14°C	+12°C	—	4-6 m/s, WNW	4.3 mm	90%
30Fri	+17°C	+14°C	—	10-11 m/s, SSW	6.5 mm	94%
31Sat	+17°C	+14°C	—	10-11 m/s, S	2.5 mm	76%

Weather highs and lows in Viana do Castelo for december

Warmest day: 12 december, +17°C
Coldest night: 4 december, +5°C
Max precipitation: 20 december, 11.2 mm
Warmest water: —
Coldest water: —

Climate in Viana do Castelo in december

Year: 2022
Average daytime temperature: +15°C
Average nighttime temperature: +11°C
Water temperature: —
Precipitation (month): 91.4 mm
Days with precipitation: 16
Humidity: 85%
Wind: 5 m/s

Daily air temperature for the month

Day Night

Tap a date to open detailed weather for that day

December	Day	Night	Sea t°	Wind	Precip	Humidity
1Wed	+14°C	+9°C	—	4-6 m/s, NW	0.1 mm	85%
2Thu	+13°C	+8°C	—	7 m/s, N	0.1 mm	74%
3Fri	+12°C	+7°C	—	2-4 m/s, SSE	0.3 mm	84%
4Sat	+15°C	+10°C	—	5-7 m/s, NNW	4.2 mm	86%
5Sun	+14°C	+11°C	—	6-7 m/s, NNW	0 mm	78%
6Mon	+12°C	+10°C	—	2-3 m/s, S	1.6 mm	90%
7Tue	+15°C	+11°C	—	6-9 m/s, WSW	1.1 mm	92%
8Wed	+12°C	+10°C	—	8-9 m/s, NW	0.4 mm	76%
9Thu	+14°C	+12°C	—	7-8 m/s, WNW	1 mm	87%
10Fri	+15°C	+11°C	—	5-6 m/s, NW	0.9 mm	93%
11Sat	+16°C	+11°C	—	3-4 m/s, N	0.1 mm	87%
12Sun	+16°C	+8°C	—	2-3 m/s, SSE	0 mm	81%
13Mon	+15°C	+10°C	—	4-5 m/s, SSE	0 mm	80%
14Tue	+17°C	+9°C	—	2-3 m/s, N	0 mm	77%
15Wed	+18°C	+7°C	—	2 m/s, SE	0 mm	61%
16Thu	+17°C	+7°C	—	2 m/s, ESE	0 mm	61%
17Fri	+16°C	+7°C	—	2-3 m/s, E	0 mm	62%
18Sat	+16°C	+7°C	—	2-3 m/s, E	0 mm	58%
19Sun	+14°C	+7°C	—	4-5 m/s, ESE	0 mm	62%
20Mon	+14°C	+11°C	—	5-6 m/s, ESE	0 mm	72%
21Tue	+17°C	+12°C	—	6-7 m/s, SE	3.5 mm	80%
22Wed	+17°C	+12°C	—	6-7 m/s, SSE	0.3 mm	85%
23Thu	+14°C	+11°C	—	5-7 m/s, SE	2.3 mm	90%
24Fri	+15°C	+11°C	—	8-10 m/s, S	1.9 mm	88%
25Sat	+14°C	+11°C	—	5-8 m/s, WNW	1.4 mm	90%
26Sun	+16°C	+12°C	—	5-7 m/s, SSW	6.2 mm	95%
27Mon	+15°C	+14°C	—	8-9 m/s, SW	2.4 mm	90%
28Tue	+15°C	+14°C	—	6-7 m/s, S	1.4 mm	97%
29Wed	+16°C	+13°C	—	5 m/s, SSE	0.5 mm	94%
30Thu	+19°C	+12°C	—	3 m/s, SE	0 mm	83%
31Fri	+19°C	+12°C	—	4 m/s, SE	0 mm	70%

Weather highs and lows in Viana do Castelo for december

Warmest day: 30 december, +19°C
Coldest night: 3 december, +7°C
Max precipitation: 26 december, 6.2 mm
Warmest water: —
Coldest water: —

Climate in Viana do Castelo in december

Year: 2021
Average daytime temperature: +15°C
Average nighttime temperature: +10°C
Water temperature: —
Precipitation (month): 29.7 mm
Days with precipitation: 11
Humidity: 81%
Wind: 5 m/s

Daily air temperature for the month

Day Night

Tap a date to open detailed weather for that day

December	Day	Night	Sea t°	Wind	Precip	Humidity
1Tue	+18°C	+10°C	—	2-3 m/s, NNE	0 mm	63%
2Wed	+15°C	+9°C	—	4-5 m/s, NNE	0 mm	69%
3Thu	+13°C	+8°C	—	4-9 m/s, SSW	0.1 mm	78%
4Fri	+11°C	+6°C	—	8-9 m/s, NW	1.4 mm	75%
5Sat	+11°C	+7°C	—	6-7 m/s, NNW	1.4 mm	78%
6Sun	+11°C	+8°C	—	3-5 m/s, NNW	0.8 mm	81%
7Mon	+13°C	+9°C	—	8-11 m/s, WNW	2.8 mm	80%
8Tue	+12°C	+8°C	—	7-9 m/s, NNW	2.1 mm	76%
9Wed	+12°C	+6°C	—	3-4 m/s, SSE	1.1 mm	86%
10Thu	+15°C	+10°C	—	6-9 m/s, WNW	4.1 mm	96%
11Fri	+16°C	+12°C	—	7-9 m/s, W	2.3 mm	94%
12Sat	+14°C	+12°C	—	3-4 m/s, SW	0.1 mm	90%
13Sun	+15°C	+12°C	—	5-7 m/s, SSW	2.8 mm	92%
14Mon	+14°C	+9°C	—	5 m/s, W	1.7 mm	86%
15Tue	+12°C	+9°C	—	6-9 m/s, S	3.2 mm	82%
16Wed	+13°C	+9°C	—	5-11 m/s, NW	11.6 mm	86%
17Thu	+13°C	+9°C	—	3-4 m/s, SSE	0 mm	85%
18Fri	+13°C	+10°C	—	7-10 m/s, S	1.9 mm	84%
19Sat	+14°C	+11°C	—	4-7 m/s, W	3.5 mm	84%
20Sun	+13°C	+10°C	—	4-6 m/s, SSE	1.8 mm	88%
21Mon	+14°C	+10°C	—	7 m/s, SSE	6.6 mm	96%
22Tue	+15°C	+11°C	—	6 m/s, S	0.4 mm	94%
23Wed	+14°C	+9°C	—	5-6 m/s, NNW	1.6 mm	87%
24Thu	+12°C	+7°C	—	5-6 m/s, NNE	0 mm	76%
25Fri	+14°C	+6°C	—	4-5 m/s, ENE	0 mm	74%
26Sat	+11°C	+5°C	—	2 m/s, ESE	0 mm	65%
27Sun	+12°C	+5°C	—	5-11 m/s, WSW	0.7 mm	79%
28Mon	+12°C	+9°C	—	9-10 m/s, WNW	1 mm	75%
29Tue	+10°C	+7°C	—	7-8 m/s, NNW	1.4 mm	76%
30Wed	+10°C	+5°C	—	2-3 m/s, SE	0.2 mm	78%
31Thu	+11°C	+7°C	—	5-7 m/s, NW	1.4 mm	81%

Weather highs and lows in Viana do Castelo for december

Warmest day: 1 december, +18°C
Coldest night: 26 december, +5°C
Max precipitation: 16 december, 11.6 mm
Warmest water: —
Coldest water: —

Climate in Viana do Castelo in december

Year: 2020
Average daytime temperature: +13°C
Average nighttime temperature: +9°C
Water temperature: —
Precipitation (month): 56 mm
Days with precipitation: 19
Humidity: 82%
Wind: 5 m/s

Weather in Viana do Castelo in december by year

Year	Day	Night	Precipitation	Days with precipitation	Water
2025	+13°C	+9°C	43.9 mm	13	—
2024	+15°C	+9°C	4.9 mm	2	—
2023	+14°C	+9°C	46.9 mm	8	—
2022	+15°C	+11°C	91.4 mm	16	—
2021	+15°C	+10°C	29.7 mm	11	—
2020	+13°C	+9°C	56 mm	19	—

Comparison december in Viana do Castelo with other months

Month	Day	Night	Days with precipitation	Sunny days
January	+14°C	+8°C	9	11
February	+15°C	+9°C	6	9
March	+16°C	+9°C	9	11
April	+17°C	+11°C	7	11
May	+20°C	+13°C	5	16
June	+22°C	+15°C	2	15
July	+25°C	+16°C	1	24
August	+24°C	+16°C	1	24
September	+22°C	+15°C	5	15
October	+20°C	+14°C	11	11
November	+17°C	+11°C	10	11
December	+14°C	+9°C	11	9