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Viana do Castelo
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Weather in Viana do Castelo for August 2026

Your guide to Viana do Castelo weather in August - trends and predictions

    Temperatures

  • In general, the average temperature in Viana do Castelo at the beginning of August is 25.4 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 22.1 °C by the end of August.

    • Rain 🌧️

  • Precipitation in Viana do Castelo during August is a rare event, with an average of fewer than 2 rainy days.

    • More

  • Is August a good time to visit Viana do Castelo? check out the best time to travel to Viana do Castelo page.

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
31
Dry days
Average rainy days
0
Rainy days
Average snowy days
0
Snow days
Average temperatures
25°/14°
Temperatures
Average wind speed
21 km/h
Avg max wind
Average humidity
75 %
Avg humidity

Viana do Castelo Weather August

Move between months or click on a day
July
September
Mon.Tue.Wed.Thu.Fri.Sat.Sun.
1
Patchy rain possible
25°
2
Moderate rain at times
24°
3
Sunny
26°
4
Sunny
26°
5
Sunny
26°
6
Sunny
26°
7
Sunny
25°
8
Patchy rain possible
26°
9
Sunny
26°
10
Sunny
25°
11
Sunny
25°
12
Partly cloudy
24°
13
Patchy rain possible
23°
14
Sunny
23°
15
Sunny
24°
16
Sunny
25°
17
Partly cloudy
23°
18
Patchy rain possible
23°
19
Sunny
22°
20
Sunny
23°
21
Sunny
25°
22
Sunny
26°
23
Cloudy
25°
24
Overcast
22°
25
Mist
23°
26
Sunny
22°
27
Sunny
22°
28
Sunny
22°
29
Sunny
22°
30
Patchy rain possible
22°
31
Patchy rain possible
22°

Temperatures trend during August in Viana do Castelo

See the weather trend as well as the moving average line

August weather in Viana do Castelo day by day

Click on a date for more information
July September
Date Weather Temperatures Rain UV More
1 Aug. Patchy rain possible
Patchy rain possible
 25° /16° 0.3 mm 6
2 Aug. Moderate rain at times
Moderate rain at times
 24° /15° 0.9 mm 6
3 Aug. Sunny
Sunny
 26° /16° 0 mm 7
4 Aug. Sunny
Sunny
 26° /15° 0 mm 7
5 Aug. Sunny
Sunny
 26° /15° 0 mm 7
6 Aug. Sunny
Sunny
 26° /16° 0 mm 6
7 Aug. Sunny
Sunny
 25° /16° 0 mm 6
8 Aug. Patchy rain possible
Patchy rain possible
 26° /16° 0 mm 6
9 Aug. Sunny
Sunny
 26° /16° 0 mm 6
10 Aug. Sunny
Sunny
 25° /16° 0 mm 7
11 Aug. Sunny
Sunny
 25° /16° 0 mm 6
12 Aug. Partly cloudy
Partly cloudy
 24° /16° 0.1 mm 6
13 Aug. Patchy rain possible
Patchy rain possible
 23° /14° 0.6 mm 5
14 Aug. Sunny
Sunny
 23° /14° 0 mm 6
15 Aug. Sunny
Sunny
 24° /15° 0 mm 6
16 Aug. Sunny
Sunny
 25° /15° 0 mm 6
17 Aug. Partly cloudy
Partly cloudy
 23° /15° 0 mm 6
18 Aug. Patchy rain possible
Patchy rain possible
 23° /16° 0.4 mm 5
19 Aug. Sunny
Sunny
 22° /15° 4 mm 6
20 Aug. Sunny
Sunny
 23° /15° 0 mm 6
21 Aug. Sunny
Sunny
 25° /15° 0 mm 7
22 Aug. Sunny
Sunny
 26° /16° 0 mm 7
23 Aug. Cloudy
Cloudy
 25° /17° 0 mm 6
24 Aug. Overcast
Overcast
 22° /15° 0.1 mm 5
25 Aug. Mist
Mist
 23° /13° 0 mm 5
26 Aug. Sunny
Sunny
 22° /13° 0 mm 6
27 Aug. Sunny
Sunny
 22° /13° 0.1 mm 5
28 Aug. Sunny
Sunny
 22° /13° 0 mm 6
29 Aug. Sunny
Sunny
 22° /14° 1 mm 6
30 Aug. Patchy rain possible
Patchy rain possible
 22° /14° 1 mm 5
31 Aug. Patchy rain possible
Patchy rain possible
 22° /14° 1.1 mm 5
Next
Important Notice
Our weather forecast for Viana do Castelo in August is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Viana do Castelo forecast closer to your planned date for the most up-to-date weather information.
Change Month
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Viana do Castelo weather in August vs July vs September

Compare August weather in Viana do Castelo with the previous and following months. See how temperature, rainfall, wind, and other conditions change throughout the year to help you plan your visit.
JulyAugustSeptember
WeatherSunny
Sunny
Sunny
Sunny
Sunny
Sunny
Temperatures26°/14°25°/14°23°/13°
Rainfall61 mm29 mm207 mm
Wind22.1 km/h21.1 km/h19.4 km/h
Humidity75%75%74%
Rainy days3 days0 days8 days
Dry days28 days31 days22 days

Planning a trip to Viana do Castelo? Discover the best time to visit

Viana do Castelo in August - FAQ

What are the expected maximum and minimum temperatures in Viana do Castelo during August?
Enjoy moderate daytime temperatures of up to 25° and cooler nights around 14°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Viana do Castelo during August?
In August, Viana do Castelo can expect light to moderate rainfall, totaling 29.1 mm across approximately 0 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in Viana do Castelo during August?
The average wind speed in Viana do Castelo during August is 21 km/h, suggesting breezy to windy conditions, depending on your activities.

What to pack to Viana do Castelo in August?

As you prepare for your trip to Viana do Castelo in August, it's important to consider the typical weather patterns for the time of year. Below is a carefully tailored packing list to ensure that your time in Viana do Castelo, during August, is comfortable and enjoyable, regardless of the weather conditions.

  • Clothing
    • Warm Clothing: Sweaters, hoodies, long pants
  • Accessories
    • Sunglasses: For sun protection
    • Sun Hats: Wide-brimmed hats for sun protection in warm weather
    • Scarves: To protect you from the cold wind
    • Gloves/Mittens: Essential for cold weather
    • Warm Hats: Warm hats for insulation in cold weather

August rainfall patterns in Viana do Castelo

Explore the daily rainfall trends and prepare for Viana do Castelos August weather 💧

UV exposure in Viana do Castelo during August

Stay informed about UV levels for safe outdoor activities throughout the month of August ☀️

Quick links

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Location coordinates Where is Viana do Castelo?

Get accurate weather forecasts for Viana do Castelo, located at latitude 41.693 and longitude -8.833. Stay updated with localized weather information tailored for Viana do Castelo.

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