Viana do Castelo weather in July

In July, Viana do Castelo sees average daytime highs of 23°C and overnight lows near 16°C, with 32 mm of rain across 4.4 wet days and about 14.7 hours of daylight. It is the 2nd-warmest and 12th-wettest month of the year here.

Day-to-day highs hold fairly steady near 23°C through the month. The sky is clear or mostly clear about 66% of the time in July, and the air most often feels comfortable.

Daylight stretches from about 15 hours at the start of July to 14 h 18 min by month's end. Set against the rest of the year, July is Viana do Castelo's 1st-clearest and 8th-windiest month. For the whole year in context, see Viana do Castelo's year-round climate.

Daytime high
23°
2nd warmest
Overnight low
16°
11th coldest
Rainfall
32 mm
4.4 wet days
Daylight
14 h 42 min
5:19 AM – 8:03 PM
Cloud cover
30%
1st clearest
Wind
13 km/h
8th windiest
Solar energy
7.29 kWh/m²
Travel score
8.4
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 July

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 23°C through the month.

A typical July day in Viana do Castelo reaches about 23°C in the afternoon and slips back to 16°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 20°C and 28°C. Set against its neighbours, July runs about 2°C warmer than June and on par with August.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12215
22215
32215
42215
52315
62315
72315
82315
92316
102316
112316
122316
132316
142316
152316
162316
172316
182316
192316
202416
212416
222416
232416
242416
252416
262416
272416
282416
292416
302416
312416

Viana do Castelo weather by month

How July compares with the rest of the year at a glance. July is the 2nd-warmest and 12th-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 July

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 66% of the time in July, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 13% of July, with mostly cloudy or overcast conditions the remaining 22%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
17129
27129
37228
47228
57426
67426
77525
87624
97624
107822
117822
128020
138020
148020
158119
168119
178218
188218
198218
208119
218119
228119
238119
248119
258119
268020
278020
288020
298020
308020
318119

Chance of precipitation in July

Any precipitation

Viana do Castelo gets around 32 mm of rain over 4.4 wet days in July, the driest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 14% and peaks near 19% on the wettest days.

0%10%20%30%151015202531
Rain chance (%)
119
219
318
418
517
616
716
815
914
1014
1113
1212
1312
1412
1512
1612
1712
1812
1912
2013
2113
2213
2313
2413
2513
2613
2713
2813
2913
3014
3114

Humidity in July

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, July lands in the comfortable band about 46% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
11855261
21854271
31755271
41754281
51654291
61653301
71553311
81551331
91450351
101448361
111347382
121346402
131245412
141244432
151143442
161142452
171042472
181041481
19941481
20841491
21841501
22841501
23741502
24742502
25742502
26742492
27743492
28743482
29743472
30744472
31844463

Wind in July

Winds average 13 km/h in July.

Across July, daily wind ranges from about 12 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
113light breeze
213light breeze
313light breeze
413light breeze
513light breeze
613light breeze
713light breeze
813light breeze
913light breeze
1013light breeze
1113light breeze
1213light breeze
1313light breeze
1413light breeze
1513light breeze
1613light breeze
1712light breeze
1812light breeze
1912light breeze
2012light breeze
2112light breeze
2212light breeze
2313light breeze
2413light breeze
2513light breeze
2613light breeze
2713light breeze
2813light breeze
2913light breeze
3013light breeze
3113light breeze

Sunrise & sunset in July

DaylightNight

Daylight runs from about 15 hours at the start of July to 14 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 42 minutes over July. Sunrise moves from 5:09 AM to 5:32 AM, and sunset from 8:08 PM to 7:51 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
115.05:098:08
215.05:098:08
315.05:108:08
415.05:108:08
514.95:118:08
614.95:128:08
714.95:128:07
814.95:138:07
914.95:138:07
1014.95:148:06
1114.95:158:06
1214.85:168:05
1314.85:168:05
1414.85:178:04
1514.85:188:04
1614.75:198:03
1714.75:198:03
1814.75:208:02
1914.75:218:01
2014.65:228:01
2114.65:238:00
2214.65:247:59
2314.65:257:58
2414.55:257:57
2514.55:267:57
2614.55:277:56
2714.45:287:55
2814.45:297:54
2914.45:307:53
3014.35:317:52
3114.35:327:51

Solar energy in July

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in July, about 7.29 kWh/m² — the sunniest month for solar.

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 — July's 7.29 kWh/m² sits near the top of that range.

02468151015202531
Solar energy (kWh/m²)Level
17.3Intense
27.3Intense
37.3Intense
47.3Intense
57.4Intense
67.4Intense
77.4Intense
87.4Intense
97.4Intense
107.4Intense
117.4Intense
127.4Intense
137.4Intense
147.4Intense
157.4Intense
167.3Intense
177.3Intense
187.3Intense
197.3Intense
207.3Intense
217.3Intense
227.3Intense
237.2Intense
247.2Intense
257.2Intense
267.2Intense
277.1Intense
287.1Intense
297.1Intense
307.1Intense
317.0Intense
Planning a trip in July

Hazard calendar for Viana do Castelo

In seasonPeak

None of Viana do Castelo's seasonal hazards are active in July. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

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 July a good time to visit Viana do Castelo?

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

8.4
Sightseeing
1st-best month of the year
6.5
Beach & pool
2nd-best month of the year

July is one of the better times to visit Viana do Castelo for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Viana do Castelo in July

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

In July, Viana do Castelo sees daytime highs around 23°C and nights near 16°C. Pack sun protection. Worth having: light clothes. About 4 days see rain.

sun protectionlight clothes

Sea temperature near Viana do Castelo in July

The nearest coast averages about 17°C in July — 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 July

LowModerateHighVery highExtreme

Clear-sky midday UV in July peaks around 9 (very high — sun protection essential). 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
July 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).