Viana do Castelo weather in September
In September, Viana do Castelo sees average daytime highs of 22°C and overnight lows near 15°C, with 89 mm of rain across 7.4 wet days and about 12.3 hours of daylight. It is the 3rd-warmest and 9th-wettest month of the year here.
Highs ease over the month, from about 23°C in the first days to 21°C by the end. The sky is clear or mostly clear about 49% of the time in September, and the air most often feels comfortable.
Daylight stretches from about 13 hours at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Viana do Castelo's 3rd-clearest and 12th-windiest month. For the whole year in context, see Viana do Castelo's year-round climate.
- Daytime high
- 22°
- 3rd warmest
- Overnight low
- 15°
- 10th coldest
- Rainfall
- 89 mm
- 7.4 wet days
- Daylight
- 12 h 18 min
- 6:21 AM – 6:38 PM
- Cloud cover
- 43%
- 3rd clearest
- Wind
- 11 km/h
- 12th windiest
- Solar energy
- 4.88 kWh/m²
- Travel score
- 7.3
- 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 September
Highs ease over the month, from about 23°C in the first days to 21°C by the end.
A typical September day in Viana do Castelo reaches about 22°C in the afternoon and slips back to 15°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 19°C and 26°C. Set against its neighbours, September runs about 2°C cooler than August and about 3°C warmer than October.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 |
| Avg low (°C) | 16 | 16 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 23 | 16 |
| 2 | 23 | 16 |
| 3 | 23 | 15 |
| 4 | 23 | 15 |
| 5 | 23 | 15 |
| 6 | 23 | 15 |
| 7 | 23 | 15 |
| 8 | 23 | 15 |
| 9 | 23 | 15 |
| 10 | 22 | 15 |
| 11 | 22 | 15 |
| 12 | 22 | 15 |
| 13 | 22 | 15 |
| 14 | 22 | 15 |
| 15 | 22 | 15 |
| 16 | 22 | 15 |
| 17 | 22 | 15 |
| 18 | 22 | 15 |
| 19 | 22 | 14 |
| 20 | 21 | 14 |
| 21 | 21 | 14 |
| 22 | 21 | 14 |
| 23 | 21 | 14 |
| 24 | 21 | 14 |
| 25 | 21 | 14 |
| 26 | 21 | 14 |
| 27 | 21 | 14 |
| 28 | 21 | 14 |
| 29 | 21 | 14 |
| 30 | 21 | 14 |
Viana do Castelo weather by month
How September compares with the rest of the year at a glance. September is the 3rd-warmest and 9th-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 13° / 7° | 218 | 13.6 | 9.3 | 3.3 |
| Feb | 14° / 7° | 142 | 10.4 | 10.3 | 3.9 |
| Mar | 15° / 8° | 165 | 11.3 | 11.7 | 4.7 |
| Apr | 17° / 10° | 154 | 13 | 13.1 | 5.0 |
| May | 19° / 12° | 133 | 11.8 | 14.3 | 5.9 |
| Jun | 21° / 14° | 56 | 6.9 | 15 | 7.2 |
| Jul | 23° / 16° | 32 | 4.4 | 14.7 | 8.4 |
| Aug | 24° / 16° | 45 | 5 | 13.7 | 8.3 |
| Sep | 22° / 15° | 89 | 7.4 | 12.3 | 7.3 |
| Oct | 19° / 13° | 232 | 13.2 | 10.9 | 5.7 |
| Nov | 15° / 10° | 232 | 14.2 | 9.6 | 4.3 |
| Dec | 13° / 8° | 227 | 14.1 | 9 | 3.5 |
Cloud cover in September
The sky is clear or mostly clear about 49% of the time in September.
Beyond those clear spells, partly cloudy skies cover about 17% of September, with mostly cloudy or overcast conditions the remaining 34%. Skies tend to cloud over as the month goes on.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 75 | 74 | 74 | 74 | 74 | 74 | 72 | 72 | 72 | 70 | 70 | 69 | 68 | 68 | 66 | 65 | 64 | 63 | 62 | 62 | 61 | 60 | 59 | 59 | 58 | 58 | 57 | 56 | 56 | 56 |
| Cloudier (%) | 25 | 26 | 26 | 26 | 26 | 26 | 28 | 28 | 28 | 30 | 30 | 31 | 32 | 32 | 34 | 35 | 36 | 37 | 38 | 38 | 39 | 40 | 41 | 41 | 42 | 42 | 43 | 44 | 44 | 44 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 75 | 25 |
| 2 | 74 | 26 |
| 3 | 74 | 26 |
| 4 | 74 | 26 |
| 5 | 74 | 26 |
| 6 | 74 | 26 |
| 7 | 72 | 28 |
| 8 | 72 | 28 |
| 9 | 72 | 28 |
| 10 | 70 | 30 |
| 11 | 70 | 30 |
| 12 | 69 | 31 |
| 13 | 68 | 32 |
| 14 | 68 | 32 |
| 15 | 66 | 34 |
| 16 | 65 | 35 |
| 17 | 64 | 36 |
| 18 | 63 | 37 |
| 19 | 62 | 38 |
| 20 | 62 | 38 |
| 21 | 61 | 39 |
| 22 | 60 | 40 |
| 23 | 59 | 41 |
| 24 | 59 | 41 |
| 25 | 58 | 42 |
| 26 | 58 | 42 |
| 27 | 57 | 43 |
| 28 | 56 | 44 |
| 29 | 56 | 44 |
| 30 | 56 | 44 |
Chance of precipitation in September
Viana do Castelo gets around 89 mm of rain over 7.4 wet days in September. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 25% and peaks near 31% on the wettest days. The odds climb toward the end of the month.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 18 | 18 | 19 | 19 | 19 | 20 | 20 | 21 | 21 | 22 | 23 | 24 | 24 | 25 | 26 | 26 | 27 | 27 | 28 | 28 | 28 | 29 | 29 | 29 | 30 | 30 | 30 | 30 | 30 | 31 |
| Rain chance (%) | |
|---|---|
| 1 | 18 |
| 2 | 18 |
| 3 | 19 |
| 4 | 19 |
| 5 | 19 |
| 6 | 20 |
| 7 | 20 |
| 8 | 21 |
| 9 | 21 |
| 10 | 22 |
| 11 | 23 |
| 12 | 24 |
| 13 | 24 |
| 14 | 25 |
| 15 | 26 |
| 16 | 26 |
| 17 | 27 |
| 18 | 27 |
| 19 | 28 |
| 20 | 28 |
| 21 | 28 |
| 22 | 29 |
| 23 | 29 |
| 24 | 29 |
| 25 | 30 |
| 26 | 30 |
| 27 | 30 |
| 28 | 30 |
| 29 | 30 |
| 30 | 31 |
Humidity in September
Most of September feels comfortable — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, September lands in the comfortable band about 47% of days. It rarely turns muggy — the humid and sticky bands barely register.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 17 | 17 | 18 | 18 | 18 | 19 | 19 | 20 | 21 | 21 | 22 | 23 | 23 | 24 | 24 | 25 | 26 | 26 | 27 | 28 | 29 | 30 | 31 | 31 | 32 | 34 | 35 | 36 | 38 | 39 |
| Comfortable (%) | 44 | 44 | 44 | 45 | 45 | 45 | 46 | 46 | 46 | 47 | 47 | 47 | 47 | 48 | 48 | 48 | 49 | 49 | 49 | 50 | 50 | 49 | 49 | 48 | 48 | 47 | 46 | 46 | 45 | 44 |
| Humid (%) | 38 | 38 | 37 | 37 | 36 | 35 | 35 | 34 | 33 | 32 | 31 | 30 | 30 | 29 | 28 | 27 | 26 | 24 | 23 | 22 | 22 | 21 | 20 | 20 | 20 | 19 | 19 | 18 | 18 | 17 |
| Muggy (%) | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | |
|---|---|---|---|---|
| 1 | 17 | 44 | 38 | 1 |
| 2 | 17 | 44 | 38 | 1 |
| 3 | 18 | 44 | 37 | 1 |
| 4 | 18 | 45 | 37 | 1 |
| 5 | 18 | 45 | 36 | 0 |
| 6 | 19 | 45 | 35 | 0 |
| 7 | 19 | 46 | 35 | 0 |
| 8 | 20 | 46 | 34 | 0 |
| 9 | 21 | 46 | 33 | 0 |
| 10 | 21 | 47 | 32 | 0 |
| 11 | 22 | 47 | 31 | 0 |
| 12 | 23 | 47 | 30 | 0 |
| 13 | 23 | 47 | 30 | 0 |
| 14 | 24 | 48 | 29 | 0 |
| 15 | 24 | 48 | 28 | 0 |
| 16 | 25 | 48 | 27 | 0 |
| 17 | 26 | 49 | 26 | 0 |
| 18 | 26 | 49 | 24 | 0 |
| 19 | 27 | 49 | 23 | 0 |
| 20 | 28 | 50 | 22 | 0 |
| 21 | 29 | 50 | 22 | 0 |
| 22 | 30 | 49 | 21 | 0 |
| 23 | 31 | 49 | 20 | 0 |
| 24 | 31 | 48 | 20 | 0 |
| 25 | 32 | 48 | 20 | 0 |
| 26 | 34 | 47 | 19 | 0 |
| 27 | 35 | 46 | 19 | 0 |
| 28 | 36 | 46 | 18 | 0 |
| 29 | 38 | 45 | 18 | 0 |
| 30 | 39 | 44 | 17 | 0 |
Wind in September
Winds average 11 km/h in September, the calmest month.
Across September, daily wind ranges from about 11 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 11 | calm |
| 2 | 11 | calm |
| 3 | 11 | calm |
| 4 | 11 | calm |
| 5 | 11 | calm |
| 6 | 11 | calm |
| 7 | 11 | calm |
| 8 | 11 | calm |
| 9 | 11 | calm |
| 10 | 11 | calm |
| 11 | 11 | calm |
| 12 | 11 | calm |
| 13 | 11 | calm |
| 14 | 11 | calm |
| 15 | 11 | calm |
| 16 | 11 | calm |
| 17 | 11 | calm |
| 18 | 11 | calm |
| 19 | 11 | calm |
| 20 | 11 | calm |
| 21 | 11 | calm |
| 22 | 11 | calm |
| 23 | 11 | calm |
| 24 | 11 | calm |
| 25 | 11 | calm |
| 26 | 11 | calm |
| 27 | 11 | calm |
| 28 | 11 | calm |
| 29 | 11 | calm |
| 30 | 11 | calm |
Sunrise & sunset in September
Daylight runs from about 13 hours at the start of September to 11 h 36 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 84 minutes over September. Sunrise moves from 6:06 AM to 6:36 AM, and sunset from 7:05 PM to 6:13 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 13.0 | 12.9 | 12.9 | 12.8 | 12.8 | 12.7 | 12.7 | 12.7 | 12.6 | 12.6 | 12.5 | 12.5 | 12.4 | 12.4 | 12.3 | 12.3 | 12.2 | 12.2 | 12.1 | 12.1 | 12.0 | 12.0 | 11.9 | 11.9 | 11.8 | 11.8 | 11.7 | 11.7 | 11.7 | 11.6 |
| Sunrise (AM) | 6:06 | 6:07 | 6:08 | 6:09 | 6:10 | 6:11 | 6:12 | 6:13 | 6:14 | 6:15 | 6:16 | 6:17 | 6:18 | 6:19 | 6:20 | 6:21 | 6:22 | 6:24 | 6:25 | 6:26 | 6:27 | 6:28 | 6:29 | 6:30 | 6:31 | 6:32 | 6:33 | 6:34 | 6:35 | 6:36 |
| Sunset (PM) | 7:05 | 7:03 | 7:01 | 6:59 | 6:58 | 6:56 | 6:54 | 6:52 | 6:50 | 6:49 | 6:47 | 6:45 | 6:43 | 6:42 | 6:40 | 6:38 | 6:36 | 6:34 | 6:32 | 6:31 | 6:29 | 6:27 | 6:25 | 6:23 | 6:22 | 6:20 | 6:18 | 6:16 | 6:15 | 6:13 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 13.0 | 6:06 | 7:05 |
| 2 | 12.9 | 6:07 | 7:03 |
| 3 | 12.9 | 6:08 | 7:01 |
| 4 | 12.8 | 6:09 | 6:59 |
| 5 | 12.8 | 6:10 | 6:58 |
| 6 | 12.7 | 6:11 | 6:56 |
| 7 | 12.7 | 6:12 | 6:54 |
| 8 | 12.7 | 6:13 | 6:52 |
| 9 | 12.6 | 6:14 | 6:50 |
| 10 | 12.6 | 6:15 | 6:49 |
| 11 | 12.5 | 6:16 | 6:47 |
| 12 | 12.5 | 6:17 | 6:45 |
| 13 | 12.4 | 6:18 | 6:43 |
| 14 | 12.4 | 6:19 | 6:42 |
| 15 | 12.3 | 6:20 | 6:40 |
| 16 | 12.3 | 6:21 | 6:38 |
| 17 | 12.2 | 6:22 | 6:36 |
| 18 | 12.2 | 6:24 | 6:34 |
| 19 | 12.1 | 6:25 | 6:32 |
| 20 | 12.1 | 6:26 | 6:31 |
| 21 | 12.0 | 6:27 | 6:29 |
| 22 | 12.0 | 6:28 | 6:27 |
| 23 | 11.9 | 6:29 | 6:25 |
| 24 | 11.9 | 6:30 | 6:23 |
| 25 | 11.8 | 6:31 | 6:22 |
| 26 | 11.8 | 6:32 | 6:20 |
| 27 | 11.7 | 6:33 | 6:18 |
| 28 | 11.7 | 6:34 | 6:16 |
| 29 | 11.7 | 6:35 | 6:15 |
| 30 | 11.6 | 6:36 | 6:13 |
Solar energy in September
Average shortwave solar energy reaching the ground each day in September, about 4.88 kWh/m².
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 — September's 4.88 kWh/m² falls in the middle.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 5.7 | 5.7 | 5.6 | 5.5 | 5.5 | 5.4 | 5.4 | 5.3 | 5.3 | 5.2 | 5.1 | 5.1 | 5.0 | 4.9 | 4.9 | 4.8 | 4.8 | 4.7 | 4.7 | 4.6 | 4.5 | 4.5 | 4.4 | 4.4 | 4.3 | 4.3 | 4.2 | 4.2 | 4.1 | 4.0 |
| Level | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 5.7 | Bright |
| 2 | 5.7 | Bright |
| 3 | 5.6 | Bright |
| 4 | 5.5 | Bright |
| 5 | 5.5 | Bright |
| 6 | 5.4 | Bright |
| 7 | 5.4 | Bright |
| 8 | 5.3 | Bright |
| 9 | 5.3 | Bright |
| 10 | 5.2 | Bright |
| 11 | 5.1 | Bright |
| 12 | 5.1 | Bright |
| 13 | 5.0 | Bright |
| 14 | 4.9 | Bright |
| 15 | 4.9 | Bright |
| 16 | 4.8 | Bright |
| 17 | 4.8 | Bright |
| 18 | 4.7 | Bright |
| 19 | 4.7 | Bright |
| 20 | 4.6 | Bright |
| 21 | 4.5 | Bright |
| 22 | 4.5 | Bright |
| 23 | 4.4 | Bright |
| 24 | 4.4 | Bright |
| 25 | 4.3 | Bright |
| 26 | 4.3 | Bright |
| 27 | 4.2 | Bright |
| 28 | 4.2 | Bright |
| 29 | 4.1 | Bright |
| 30 | 4.0 | Bright |
Hazard calendar for Viana do Castelo
None of Viana do Castelo's seasonal hazards are active in September. 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.
Is September a good time to visit Viana do Castelo?
Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
September is one of the better times to visit Viana do Castelo for general sightseeing.
What to pack for Viana do Castelo in September
From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In September, Viana do Castelo sees daytime highs around 22°C and nights near 15°C. Worth packing: sun protection. About 7 days see rain.
Sea temperature near Viana do Castelo in September
The nearest coast averages about 17°C in September — 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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 14 | 13 | 14 | 14 | 15 | 17 | 17 | 17 | 17 | 17 | 16 | 15 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Cool | Cool | Cool | Cool | Cool | Cool | Cool | Bracing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 14 | Bracing |
| Feb | 13 | Bracing |
| Mar | 14 | Bracing |
| Apr | 14 | Bracing |
| May | 15 | Cool |
| Jun | 17 | Cool |
| Jul | 17 | Cool |
| Aug | 17 | Cool |
| Sep | 17 | Cool |
| Oct | 17 | Cool |
| Nov | 16 | Cool |
| Dec | 15 | Bracing |
UV index in Viana do Castelo in September
Clear-sky midday UV in September peaks around 6 — enough to warrant sun protection. 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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 2 | 3 | 5 | 6 | 7 | 9 | 9 | 8 | 6 | 4 | 2 | 2 |
| Level | Low | Moderate | Moderate | High | High | Very high | Very high | Very high | High | Moderate | Moderate | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Low |
| Feb | 3 | Moderate |
| Mar | 5 | Moderate |
| Apr | 6 | High |
| May | 7 | High |
| Jun | 9 | Very high |
| Jul | 9 | Very high |
| Aug | 8 | Very high |
| Sep | 6 | High |
| Oct | 4 | Moderate |
| Nov | 2 | Moderate |
| Dec | 2 | Low |
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.
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
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).