Viana do Castelo weather in October

In October, Viana do Castelo sees average daytime highs of 19°C and overnight lows near 13°C, with 232 mm of rain across 13.2 wet days and about 10.9 hours of daylight. It is the 5th-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 32% of the time in October, and the air most often feels dry.

Daylight stretches from about 11 h 36 min at the start of October to 10 h 12 min by month's end. Set against the rest of the year, October is Viana do Castelo's 9th-clearest and 10th-windiest month. For the whole year in context, see Viana do Castelo's year-round climate.

Daytime high
19°
5th warmest
Overnight low
13°
8th coldest
Rainfall
232 mm
13.2 wet days
Daylight
10 h 54 min
6:55 AM – 5:46 PM
Cloud cover
57%
9th clearest
Wind
12 km/h
10th windiest
Solar energy
3.17 kWh/m²
Travel score
5.7
out of 10

Viana do Castelo is city seat of Viana do Castelo municipality in northern Portugal and seat of the municipality and district of the same name.

Air quality
Excellent
PM10 9.1 µg/m³ · 2013

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in October

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 October day in Viana do Castelo reaches about 19°C in the afternoon and slips back to 13°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 16°C and 23°C. Set against its neighbours, October runs about 3°C cooler than September and about 3°C warmer than November.

10°15°20°25°151015202531
Avg high (°C)Avg low (°C)
12014
22014
32013
42013
52013
62013
72013
82013
92013
102013
111913
121913
131913
141913
151913
161913
171913
181912
191912
201912
211812
221812
231812
241812
251812
261812
271812
281812
291812
301812
311711

Viana do Castelo weather by month

How October compares with the rest of the year at a glance. October is the 5th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan13° / 21813.69.33.3
Feb14° / 14210.410.33.9
Mar15° / 16511.311.74.7
Apr17° / 10°1541313.15.0
May19° / 12°13311.814.35.9
Jun21° / 14°566.9157.2
Jul23° / 16°324.414.78.4
Aug24° / 16°45513.78.3
Sep22° / 15°897.412.37.3
Oct19° / 13°23213.210.95.7
Nov15° / 10°23214.29.64.3
Dec13° / 22714.193.5

Cloud cover in October

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 32% of the time in October.

Beyond those clear spells, partly cloudy skies cover about 15% of October, with mostly cloudy or overcast conditions the remaining 52%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15644
25545
35545
45545
55446
65545
75446
85347
95248
105248
115149
125149
135050
144951
154852
164753
174753
184654
194555
204555
214456
224357
234357
244258
254258
264258
274159
283961
293961
303961
313961

Chance of precipitation in October

Any precipitation

Viana do Castelo gets around 232 mm of rain over 13.2 wet days in October. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 43% and peaks near 50% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
131
232
332
433
534
635
736
838
939
1040
1141
1242
1344
1445
1545
1646
1747
1847
1948
2048
2148
2248
2348
2448
2548
2649
2749
2849
2950
3050
3150

Humidity in October

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, October lands in the dry band about 53% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
1414317
2424216
3434116
4454015
5463915
6473814
7483814
8493713
9503713
10513712
11523612
12533611
13533611
14543610
15543610
16543610
17543610
1855369
1955369
2055369
2155369
2256359
2357358
2458348
2558348
2659338
2760328
2861318
2963307
3064297
3166277

Wind in October

Winds average 12 km/h in October.

Across October, daily wind ranges from about 11 km/h on the calmest days to 13 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
111calm
212calm
312calm
412calm
512calm
612calm
712calm
812calm
912calm
1012calm
1112calm
1212calm
1312calm
1412light breeze
1512light breeze
1612light breeze
1712light breeze
1812light breeze
1912light breeze
2012light breeze
2113light breeze
2213light breeze
2313light breeze
2413light breeze
2513light breeze
2613light breeze
2713light breeze
2813light breeze
2913light breeze
3013light breeze
3113light breeze

Sunrise & sunset in October

DaylightNight

Daylight runs from about 11 h 36 min at the start of October to 10 h 12 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 84 minutes over October. Sunrise moves from 6:38 AM to 7:13 AM, and sunset from 6:11 PM to 5:25 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.66:386:11
211.56:396:09
311.56:406:08
411.46:416:06
511.46:426:04
611.36:436:02
711.36:446:01
811.26:455:59
911.26:475:57
1011.16:485:56
1111.16:495:54
1211.06:505:52
1311.06:515:51
1410.96:525:49
1510.96:535:48
1610.96:555:46
1710.86:565:45
1810.86:575:43
1910.76:585:41
2010.76:595:40
2110.67:015:39
2210.67:025:37
2310.57:035:36
2410.57:045:34
2510.57:055:33
2610.47:075:31
2710.47:085:30
2810.37:095:29
2910.37:105:27
3010.27:125:26
3110.27:135:25

Solar energy in October

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in October, about 3.17 kWh/m².

For context, solar energy here swings from a low near 1.59 kWh/m² to a high of 7.29 kWh/m² in July across the year — October's 3.17 kWh/m² falls in the middle.

01234151015202531
Solar energy (kWh/m²)Level
14.0Bright
23.9Moderate
33.9Moderate
43.8Moderate
53.8Moderate
63.7Moderate
73.7Moderate
83.6Moderate
93.5Moderate
103.5Moderate
113.4Moderate
123.4Moderate
133.3Moderate
143.2Moderate
153.2Moderate
163.1Moderate
173.1Moderate
183.0Moderate
193.0Moderate
202.9Moderate
212.9Moderate
222.8Moderate
232.8Moderate
242.7Moderate
252.7Moderate
262.6Moderate
272.6Moderate
282.6Moderate
292.5Moderate
302.5Moderate
312.5Moderate
Planning a trip in October

Hazard calendar for Viana do Castelo

In seasonPeak

In October, Viana do Castelo sits inside its rainy season season. The full year is below, with each hazard's peak months called out.

Viana do Castelo's rainy season runs October–May, when most of the year's rain falls.

Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is October a good time to visit Viana do Castelo?

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

5.7
Sightseeing
6th-best month of the year
2.4
Beach & pool
5th-best month of the year

October is a reasonable time to visit Viana do Castelo for sightseeing.

What to pack for Viana do Castelo in October

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

In October, Viana do Castelo sees daytime highs around 19°C and nights near 13°C. Worth packing: rain gear. About 13 days see rain.

rain gear

Sea temperature near Viana do Castelo in October

The nearest coast averages about 17°C in October — 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 13°C.

The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.

12°14°16°18°JanFebMarAprMayJunJulAugSepOctNovDecbracingcool
Sea temperature (°C)Comfort
Jan14Bracing
Feb13Bracing
Mar14Bracing
Apr14Bracing
May15Cool
Jun17Cool
Jul17Cool
Aug17Cool
Sep17Cool
Oct17Cool
Nov16Cool
Dec15Bracing

UV index in Viana do Castelo in October

LowModerateHighVery highExtreme

Clear-sky midday UV in October peaks around 4 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Viana do Castelo peaks around June 23 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJun 23UV 9Dec 20UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May7High
Jun9Very high
Jul9Very high
Aug8Very high
Sep6High
Oct4Moderate
Nov2Moderate
Dec2Low
Location & terrain

Where is Viana do Castelo?

Viana do Castelo sits at 41.7°N, 8.8°W, 12 m above sea level, in Portugal. The nearest listed city is Esposende, 18 km away.

Topography around Viana do Castelo

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

Within 3 km, the terrain around Viana do Castelo has significant variations in elevation — a maximum elevation change of 300 m around an average of 29 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 793 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,517 m.

The land around Viana do Castelo is covered by water (37%), trees (23%) and artificial surfaces (22%) within 3 km, water (47%) and trees (29%) within 16 km, and trees (38%), water (32%) and grassland (22%) within 80 km.

3 km
300 m
16 km
793 m
80 km
1,517 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwaterwetland
October weather nearby: Esposende 18 km · Ponte de Lima 22 km · Barcelos 25 km · Pedroso 32 km · Póvoa de Varzim 35 km · Braga 38 km · Arcos de Valdevez 38 km · Vila do Conde 38 km

Portugal travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type C / E / F
230 V · 50 Hz
Prices
≈ 60% of US
price level, 2025
GDP per capita
$32,082
2025
Happiness
6.0 / 10
World Happiness, 2025
Safe drinking water
95%
of population, 2024
Homicide rate
0.7
per 100k, 2022
Road deaths
8.2
per 100k/yr, 2019
Income group
High
World Bank
English
Very high
EF EPI 612
Religion
Catholic 68%not applicable 13%no religion 12%no response 2%

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 Viana do Castelo (41.6932°, -8.8329°, elevation 12 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).