Weather in Viana do Castelo for September 2026
So far, September 2026 in Viana do Castelo shows a warmer trend than usual by 4.3 °C.
The forecast for the coming days of September 2026 predicts a temperature of 30.5 °C , which is warmer than usual.
In general, the average temperature in Viana do Castelo at the beginning of September is 23.1 °C. As the month progressed, temperatures tended to remain steady, reaching an average of 23.1 °C by the end of September.
Viana do Castelo in September brings notable rainfall, with an average of 17 rainy days and a total precipitation of 69.1 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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Viana do Castelo Weather September
Temperatures trend during September in Viana do Castelo
September weather in Viana do Castelo day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Light rain shower | 22° /13° | 2 mm | 6 | |
| 2 Sept. |  Sunny | 23° /13° | 0.3 mm | 6 | |
| 3 Sept. |  Moderate rain at times | 24° /15° | 3.3 mm | 6 | |
| 4 Sept. | Light rain shower | 25° /15° | 1.7 mm | 5 | |
| 5 Sept. | Sunny | 24° /15° | 3.4 mm | 6 | |
| 6 Sept. |  Thundery outbreaks possible | 22° /14° | 2.7 mm | 5 | |
| 7 Sept. |  Partly cloudy | 22° /14° | 1.3 mm | 6 | |
| 8 Sept. |  Patchy light rain with thunder | 21° /13° | 4 mm | 5 | |
| 9 Sept. | Moderate or heavy rain shower | 21° /13° | 6.3 mm | 6 | |
| 10 Sept. | Patchy rain possible | 22° /15° | 2.8 mm | 5 | |
| 11 Sept. | Sunny | 28° /15° | 0 mm | 6.8 | |
| 12 Sept. | Sunny | 31° /18° | 0 mm | 6.7 | |
| 13 Sept. | Sunny | 34° /21° | 0 mm | 6.4 | |
| 14 Sept. | Sunny | 33° /20° | 0 mm | 6.4 | |
| 15 Sept. | Sunny | 27° /17° | 0 mm | 7 | |
| 16 Sept. | Sunny | 27° /13° | 0 mm | 7 | |
| 17 Sept. |  Overcast | 26° /14° | 0 mm | 6 | |
| 18 Sept. | Sunny | 26° /14° | 0 mm | 7 | |
| 19 Sept. | Overcast | 29° /15° | 0 mm | 7 | |
| 20 Sept. | Sunny | 32° /19° | 0 mm | 8 | |
| 21 Sept. | Sunny | 35° /21° | 0 mm | 9 | |
| 22 Sept. | Sunny | 34° /21° | 0 mm | 8 | |
| 23 Sept. | Sunny | 33° /21° | 0 mm | 8 | |
| 24 Sept. | Sunny | 32° /20° | 0 mm | 8 | |
| 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 | |
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Viana do Castelo weather in September vs August vs October
| August | September | October | |
|---|---|---|---|
| Weather | Sunny | Patchy rain possible | Patchy rain possible |
| Temperatures | 24°/15° | 21°/14° | 20°/14° |
| Rainfall | 10 mm | 69 mm | 221 mm |
| Wind | 21.1 km/h | 19.4 km/h | 19.9 km/h |
| Humidity | 74% | 74% | 77% |
| Rainy days | 4 days | 17 days | 29 days |
| Dry days | 27 days | 13 days | 2 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?
How much rainfall should be expected in Viana do Castelo during September?
What are the typical wind conditions in Viana do Castelo during September?
September rainfall patterns in Viana do Castelo
UV exposure in Viana do Castelo during September
What to pack to Viana do Castelo in September?
Mild · highs around 21 °C, frequent showers
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
👟 Footwear
🎒 Accessories
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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.