Viana do Castelo
September
Weather in Viana do Castelo for September 2026
Your guide to Viana do Castelo weather in September - trends and predictions
In general, the average temperature in Viana do Castelo at the beginning of September is 21.4 °C. As the month progressed, temperatures tended to slightly increase, reaching an average of 21.6 °C by the end of September.
Viana do Castelo experiences moderate rainfall in September, with an average of 8 rainy days and a total precipitation of 207.4 mm.
Is September a good time to visit Viana do Castelo? check out the best time to travel to Viana do Castelo page.
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Temperatures
Rain 🌧️
More
22
Dry days
8
Rainy days
0
Snow days
23°/13°
Temperatures
19 km/h
Avg max wind
74 %
Avg humidity
Viana do Castelo Weather September
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Temperatures trend during September in Viana do Castelo
See the weather trend as well as the moving average line
September weather in Viana do Castelo day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Light rain shower | 21° /14° | 2.6 mm | 5 | |
| 2 Sept. | Patchy rain possible | 21° /13° | 0.4 mm | 5 | |
| 3 Sept. |  Moderate rain at times | 22° /14° | 4.4 mm | 5 | |
| 4 Sept. | Light rain shower | 22° /13° | 2.3 mm | 5 | |
| 5 Sept. |  Sunny | 22° /13° | 4.4 mm | 6 | |
| 6 Sept. |  Thundery outbreaks possible | 21° /13° | 3.6 mm | 5 | |
| 7 Sept. |  Partly cloudy | 21° /14° | 1.7 mm | 5 | |
| 8 Sept. |  Patchy light rain with thunder | 21° /13° | 2.1 mm | 5 | |
| 9 Sept. | Moderate or heavy rain shower | 21° /13° | 8.4 mm | 5 | |
| 10 Sept. | Patchy rain possible | 22° /15° | 2.8 mm | 5 | |
| 11 Sept. | Partly cloudy | 22° /14° | 0 mm | 6 | |
| 12 Sept. | Sunny | 22° /14° | 0 mm | 6 | |
| 13 Sept. | Sunny | 23° /14° | 0 mm | 6 | |
| 14 Sept. | Sunny | 24° /15° | 0 mm | 6 | |
| 15 Sept. | Partly cloudy | 23° /15° | 0 mm | 6 | |
| 16 Sept. | Sunny | 24° /15° | 2.8 mm | 6 | |
| 17 Sept. | Sunny | 23° /15° | 8.5 mm | 6 | |
| 18 Sept. | Patchy rain possible | 23° /16° | 3.1 mm | 6 | |
| 19 Sept. | Sunny | 22° /14° | 0 mm | 5 | |
| 20 Sept. | Light rain shower | 20° /14° | 3.4 mm | 4 | |
| 21 Sept. | Light rain shower | 19° /13° | 4.2 mm | 5 | |
| 22 Sept. | Light rain shower | 20° /12° | 0.9 mm | 5 | |
| 23 Sept. | Sunny | 20° /11° | 0 mm | 6 | |
| 24 Sept. | Sunny | 21° /13° | 1.5 mm | 5 | |
| 25 Sept. | Sunny | 22° /15° | 4.9 mm | 5 | |
| 26 Sept. |  Cloudy | 20° /14° | 5.9 mm | 5 | |
| 27 Sept. | Sunny | 19° /12° | 0.8 mm | 5 | |
| 28 Sept. | Partly cloudy | 22° /13° | 0.6 mm | 5 | |
| 29 Sept. | Sunny | 23° /14° | 0.1 mm | 6 | |
| 30 Sept. | Sunny | 24° /16° | 0 mm | 6 | |
| Next | |||||
Important Notice
Our weather forecast for Viana do Castelo in September 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
Viana do Castelo weather in September vs August vs October
Compare September 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.
| August | September | October | |
|---|---|---|---|
| Weather | Sunny | Sunny | Light rain shower |
| Temperatures | 25°/14° | 23°/13° | 22°/13° |
| Rainfall | 29 mm | 207 mm | 655 mm |
| Wind | 21.1 km/h | 19.4 km/h | 19.9 km/h |
| Humidity | 75% | 74% | 78% |
| Rainy days | 0 days | 8 days | 15 days |
| Dry days | 31 days | 22 days | 16 days |
Planning a trip to Viana do Castelo? Discover the best time to visit
Viana do Castelo in September - FAQ
What are the expected maximum and minimum temperatures in Viana do Castelo during September?
Enjoy moderate daytime temperatures of up to 23° and cooler nights around 13°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Viana do Castelo during September?
Significant rainfall exceeding 207.4 mm is expected in Viana do Castelo during September, occurring over more than 8 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Viana do Castelo during September?
The average wind speed in Viana do Castelo during September is 19 km/h, suggesting breezy to windy conditions, depending on your activities.
What to pack to Viana do Castelo in September?
As you prepare for your trip to Viana do Castelo in September, 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 September, is comfortable and enjoyable, regardless of the weather conditions.
- Clothing
- Warm Clothing: Sweaters, hoodies, long pants
- Rain Gear: Lightweight, waterproof clothing
- Footwear
- Waterproof Shoes
- 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
- Umbrellas/Raincoats: For rainy days
September rainfall patterns in Viana do Castelo
Explore the daily rainfall trends and prepare for Viana do Castelos September weather 💧
Typically, Viana do Castelo has 8 rainy days in September with a total of 207.4 mm of rainfall.
UV exposure in Viana do Castelo during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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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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