Viana do Castelo, Portugal Weather

  1. Viana do Castelo, Portugal Weather
  2. Current conditions
  3. Weather forecast
  4. Averages and extremes
  5. Yesterday's Data
  6. Temperature and possibility of rain in Viana do Castelo over the next 12 hours
  7. Temperature and possibility of rain in Viana do Castelo in the coming days
  8. Rainfall in Viana do Castelo in the coming days
  9. Viana do Castelo Weather Summary
  10. Weather averages by month
  11. Viana do Castelo's weather
  12. Frequently asked questions
  13. Comments
Viana do Castelo, Weather
(Photo by Nick Karvounis on Unsplash)

Current conditions

Updated:
17°C
62.6°F
°C °F

Condition: Overcast

Pressure: 1,015 hPa

Feel like: 19 °C

Temperature: 17°C

Cloud: 100%

Humidity: 87%

Wind: NW - 4 km/h

Visibility: 26.7 km

Weather forecast

Sun
21 Jun
18°C / 25°C
Overcast
Mon
22 Jun
20°C / 29°C
Overcast
Tue
23 Jun
23°C / 31°C
Overcast
Wed
24 Jun
19°C / 29°C
Overcast
Thu
25 Jun
17°C / 21°C
Overcast
Hourly forecast today:
00:00 AM
15° / 17°
15° / 17°
Overcast
87% 9 km/h
01:00 AM
15° / 17°
15° / 17°
Overcast
88% 7 km/h
02:00 AM
15° / 17°
15° / 17°
Overcast
91% 4 km/h
03:00 AM
15° / 16°
15° / 16°
Overcast
93% 5 km/h
04:00 AM
15° / 16°
15° / 16°
Partly Cloudy
93% 5 km/h
05:00 AM
15° / 16°
15° / 16°
Fog
95% 6 km/h
06:00 AM
15° / 16°
15° / 16°
Fog
95% 5 km/h
07:00 AM
16° / 17°
16° / 17°
Mainly Clear
90% 5 km/h
08:00 AM
15° / 19°
15° / 19°
Clear Sky
80% 3 km/h
09:00 AM
15° / 20°
15° / 20°
Clear Sky
73% 11 km/h
10:00 AM
16° / 21°
16° / 21°
Mainly Clear
72% 19 km/h

30 Day Averages and Extremes

  • Average high 22.0°C
  • Average low 15.63°C
  • Hottest day 31°C (11 June 2026)
  • Coldest day 0°C (03 July 2026)
  • Average humidity 70.13%
  • Days with precipitation 12 days
  • Highest precipitation 19 mm (25 June 2026)

Yesterday's Data

  • Max: 24°C
  • Min: 16°C
  • Total Precipitation: 0 mm

Temperature and possibility of rain in Viana do Castelo over the next 12 hours

Temperature and possibility of rain in Viana do Castelo in the coming days

Rainfall in Viana do Castelo in the coming days

Viana do Castelo Climate Summary

Viana do Castelo features a Mediterranean, warm summer (Köppen classification: Csb), with an average annual temperature of 15.89ºC (60.6ºF), which is about -0.92% lower than the national average for Portugal. Annually, the city experiences approximately 155.54 millimeters (6.12 inches) of rainfall, spread across 130.55 rainy days, accounting for 35.77% of the year.

Longitude 41.6918275
Latitude -8.8344101
Yearly high temperature 17.97ºC (64.35ºF)
Yearly low temperature 12.46ºC (54.43ºF)
Hottest month July 23.07ºC (73.53ºF)
Coldest month August 16.52ºC (61.74ºF)
Yearly precip 155.54mm (6.12in)
Days with rainfall 130.55 days (35.77%)
Driest month July (76.39%)
Wettest month October (76.08%)

Weather averages by month

Month High / Low (°C) Rain
January 13.12° / 8.96° 15.36 days
February 13.32° / 8.58° 13.0 days
March 14.91° / 9.33° 14.27 days
April 16.51° / 10.69° 12.55 days
May 18.85° / 12.65° 9.64 days
June 20.68° / 14.4° 8.0 days
July 23.07° / 16.32° 4.0 days
August 23.24° / 16.52° 4.73 days
September 22.63° / 16.2° 7.0 days
October 19.77° / 14.66° 12.09 days
November 15.68° / 11.46° 15.82 days
December 13.89° / 9.78° 14.09 days

Viana do Castelo's weather

Frequently asked questions

1. What is the hottest month in Viana do Castelo?

July has the highest average monthly temperature (daily mean of 23.07ºC) and August are the coolest (daily mean of 16.52ºC).

2. What should I wear in Viana do Castelo today?

For today's warm weather in Viana do Castelo, with temperatures between 21ºC to 24ºC (69.8ºF to 75.2ºF), you might consider wearing:
- Sun hat or cap
- Cotton or linen fabrics
- T-shirt or short-sleeve blouse
- Shorts or lightweight trousers

Temperature

Early
15°C / 16°C
Morning
15°C / 20°C
Afternoon
15°C / 24°C
Evening
15°C / 19°C

Air quality

Good

Satisfactory air quality, minimal pollution, low risk

  • CO2 452
  • CO 93
  • NH3 0
  • NO2 2
  • O3 53
  • PM10 6
  • PM25 3
  • SO2 0
  • CH4 1,355

Sunrise / Sunset

05:00
20:13