Weather in Viana do Castelo on 4 August 2026
Preliminary outlook for 4 August 2026
A preliminary estimate based on the 2020–2025 archive: daytime around +25°C and nighttime around +16°C, average precipitation 0.1 mm, wind around 5 m/s, humidity around 71%.
This is a climate-based estimate, not a precise long-range forecast. It is replaced by hourly data when the date enters the forecast window.
+23°C
Weather archive — latest year: 2025
Clear/Sunny
Weather archive — latest year: 2025
Nighttime: +18°C
Precipitation: 0 mm
Wind: 2 — 2 m/s
Humidity: 55%
| Metric | Value | Metric | Value |
|---|---|---|---|
| Day temperature (max.) | +27°C | Sun hours | 14 h |
| UV index | 6 | Cloud cover (avg.) | 0% |
| Pressure (avg.) | 763 mmHg | Snow (total for the day) | 0 cm |
| Visibility (avg.) | 10 km | Sea temperature | — |
| Feels like (avg.) | +24°C | Dew point (avg.) | +14°C |
| Heat index (avg.) | +26°C | Wind chill (avg.) | +24°C |
| Wind gusts (max.) | 4 m/s | Wind direction (avg.) | 182° ← (WNW) |
Sunrise
06:32
Duration
14 h 17 min
Sunset
20:49
Moonrise
18:01
Moonset
01:39
Moon phase
Waxing Gibbous
Illumination
69%
+20°C
Weather archive — for 2024 year
Clear/Sunny
Weather archive — for 2024 year
Nighttime: +17°C
Sea temperature: +19°C
Precipitation: 0 mm
Wind: 6 — 7 m/s
| Metric | Value | Metric | Value |
|---|---|---|---|
| Day temperature (max.) | +25°C | Sun hours | 14 h |
| UV index | 6 | Cloud cover (avg.) | 0% |
| Pressure (avg.) | 761 mmHg | Snow (total for the day) | 0 cm |
| Visibility (avg.) | 10 km | Sea temperature | +19°C |
| Feels like (avg.) | +21°C | Dew point (avg.) | +15°C |
| Heat index (avg.) | +22°C | Wind chill (avg.) | +21°C |
| Wind gusts (max.) | 13 m/s | Wind direction (avg.) | 256° ↖ (NW) |
Sunrise
06:33
Duration
14 h 16 min
Sunset
20:49
Moonrise
06:14
Moonset
21:19
Moon phase
New Moon
Illumination
0%
+19°C
Weather archive — for 2023 year
Clear/Sunny
Weather archive — for 2023 year
Nighttime: +14°C
Precipitation: 0 mm
Wind: 7 — 8 m/s
Humidity: 67%
| Metric | Value | Metric | Value |
|---|---|---|---|
| Day temperature (max.) | +25°C | Sun hours | 14 h |
| UV index | 5 | Cloud cover (avg.) | 0% |
| Pressure (avg.) | 767 mmHg | Snow (total for the day) | 0 cm |
| Visibility (avg.) | 10 km | Sea temperature | — |
| Feels like (avg.) | +20°C | Dew point (avg.) | +13°C |
| Heat index (avg.) | +20°C | Wind chill (avg.) | +19°C |
| Wind gusts (max.) | 13 m/s | Wind direction (avg.) | 177° ↖ (NNW) |
Sunrise
06:32
Duration
14 h 18 min
Sunset
20:50
Moonrise
22:39
Moonset
09:15
Moon phase
Waning Gibbous
Illumination
78%
+22°C
Weather archive — for 2022 year
Clear/Sunny
Weather archive — for 2022 year
Nighttime: +18°C
Precipitation: 0 mm
Wind: 4 — 6 m/s
Humidity: 77%
| Metric | Value | Metric | Value |
|---|---|---|---|
| Day temperature (max.) | +28°C | Sun hours | 14 h |
| UV index | 6 | Cloud cover (avg.) | 7% |
| Pressure (avg.) | 759 mmHg | Snow (total for the day) | 0 cm |
| Visibility (avg.) | 10 km | Sea temperature | — |
| Feels like (avg.) | +23°C | Dew point (avg.) | +17°C |
| Heat index (avg.) | +23°C | Wind chill (avg.) | +22°C |
| Wind gusts (max.) | 11 m/s | Wind direction (avg.) | 253° ↖ (NW) |
Sunrise
06:32
Duration
14 h 18 min
Sunset
20:50
Moonrise
13:14
Moonset
Does not set today
Moon phase
First Quarter
Illumination
44%
+19°C
Weather archive — for 2021 year
Patchy rain nearby
Weather archive — for 2021 year
Nighttime: +15°C
Precipitation: 0.3 mm
Wind: 4 — 6 m/s
Humidity: 81%
| Metric | Value | Metric | Value |
|---|---|---|---|
| Day temperature (max.) | +22°C | Sun hours | 12 h |
| UV index | 4 | Cloud cover (avg.) | 42% |
| Pressure (avg.) | 765 mmHg | Snow (total for the day) | 0 cm |
| Visibility (avg.) | 8 km | Sea temperature | — |
| Feels like (avg.) | +19°C | Dew point (avg.) | +15°C |
| Heat index (avg.) | +20°C | Wind chill (avg.) | +19°C |
| Wind gusts (max.) | 8 m/s | Wind direction (avg.) | 337° ↖ (NW) |
Sunrise
06:32
Duration
14 h 17 min
Sunset
20:49
Moonrise
02:44
Moonset
18:30
Moon phase
Waning Crescent
Illumination
18%
+20°C
Weather archive — for 2020 year
Clear/Sunny
Weather archive — for 2020 year
Nighttime: +15°C
Precipitation: 0 mm
Wind: 5 — 7 m/s
Humidity: 77%
| Metric | Value | Metric | Value |
|---|---|---|---|
| Day temperature (max.) | +25°C | Sun hours | 14 h |
| UV index | 6 | Cloud cover (avg.) | 4% |
| Pressure (avg.) | 762 mmHg | Snow (total for the day) | 0 cm |
| Visibility (avg.) | 10 km | Sea temperature | — |
| Feels like (avg.) | +21°C | Dew point (avg.) | +15°C |
| Heat index (avg.) | +21°C | Wind chill (avg.) | +20°C |
| Wind gusts (max.) | 13 m/s | Wind direction (avg.) | 173° ↖ (NNW) |
Sunrise
06:33
Duration
14 h 16 min
Sunset
20:49
Moonrise
21:48
Moonset
07:05
Moon phase
Full Moon
Illumination
100%
Weather in Viana do Castelo on 4 August in previous years
| Year | Day | Nighttime | Average | Sun | UV | Humidity | Wind |
|---|---|---|---|---|---|---|---|
| 2025 |
+27°C
|
+18°C
|
+23°C | 14 h | 6 | 55% | 2 — 2 m/s |
| 2024 |
+25°C
|
+17°C
|
+20°C | 14 h | 6 | 69% | 6 — 7 m/s |
| 2023 |
+25°C
|
+14°C
|
+19°C | 14 h | 5 | 67% | 7 — 8 m/s |
| 2022 |
+28°C
|
+18°C
|
+22°C | 14 h | 6 | 77% | 4 — 6 m/s |
| 2021 |
+22°C
|
+15°C
|
+19°C | 12 h | 4 | 81% | 4 — 6 m/s |
| 2020 |
+25°C
|
+15°C
|
+20°C | 14 h | 6 | 77% | 5 — 7 m/s |