Weather in Cascais on 17 August 2026
Preliminary outlook for 17 August 2026
A preliminary estimate based on the 2020–2025 archive: daytime around +23°C and nighttime around +19°C, average precipitation 0 mm, wind around 7 m/s, humidity around 81%.
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.
+21°C
Weather archive — latest year: 2025
Clear/Sunny
Weather archive — latest year: 2025
Nighttime: +19°C
Precipitation: 0 mm
Wind: 7 — 9 m/s
Humidity: 74%
| Metric | Value | Metric | Value |
|---|---|---|---|
| Day temperature (max.) | +23°C | Sun hours | 14 h |
| UV index | 6 | Cloud cover (avg.) | 1% |
| Pressure (avg.) | 764 mmHg | Snow (total for the day) | 0 cm |
| Visibility (avg.) | 10 km | Sea temperature | — |
| Feels like (avg.) | +21°C | Dew point (avg.) | +16°C |
| Heat index (avg.) | +22°C | Wind chill (avg.) | +21°C |
| Wind gusts (max.) | 13 m/s | Wind direction (avg.) | 351° ↖ (NNW) |
Sunrise
06:53
Duration
13 h 36 min
Sunset
20:29
Moonrise
00:10
Moonset
15:47
Moon phase
Last Quarter
Illumination
37%
+22°C
Weather archive — for 2024 year
Clear/Sunny
Weather archive — for 2024 year
Nighttime: +20°C
Sea temperature: +20°C
Precipitation: 0 mm
Wind: 9 — 9 m/s
| Metric | Value | Metric | Value |
|---|---|---|---|
| Day temperature (max.) | +24°C | Sun hours | 14 h |
| UV index | 6 | Cloud cover (avg.) | 3% |
| Pressure (avg.) | 762 mmHg | Snow (total for the day) | 0 cm |
| Visibility (avg.) | 10 km | Sea temperature | +20°C |
| Feels like (avg.) | +24°C | Dew point (avg.) | +18°C |
| Heat index (avg.) | +25°C | Wind chill (avg.) | +23°C |
| Wind gusts (max.) | 16 m/s | Wind direction (avg.) | 354° ↑ (N) |
Sunrise
06:53
Duration
13 h 36 min
Sunset
20:29
Moonrise
19:26
Moonset
03:46
Moon phase
Waxing Gibbous
Illumination
86%
+20°C
Weather archive — for 2023 year
Clear/Sunny
Weather archive — for 2023 year
Nighttime: +18°C
Precipitation: 0 mm
Wind: 5 — 6 m/s
Humidity: 82%
| Metric | Value | Metric | Value |
|---|---|---|---|
| Day temperature (max.) | +23°C | Sun hours | 14 h |
| UV index | 6 | Cloud cover (avg.) | 14% |
| Pressure (avg.) | 763 mmHg | Snow (total for the day) | 0 cm |
| Visibility (avg.) | 10 km | Sea temperature | — |
| Feels like (avg.) | +21°C | Dew point (avg.) | +17°C |
| Heat index (avg.) | +22°C | Wind chill (avg.) | +21°C |
| Wind gusts (max.) | 9 m/s | Wind direction (avg.) | 329° ↖ (NW) |
Sunrise
06:53
Duration
13 h 37 min
Sunset
20:30
Moonrise
07:57
Moonset
21:30
Moon phase
Waxing Crescent
Illumination
1%
+20°C
Weather archive — for 2022 year
Clear/Sunny
Weather archive — for 2022 year
Nighttime: +19°C
Precipitation: 0 mm
Wind: 8 — 11 m/s
Humidity: 76%
| Metric | Value | Metric | Value |
|---|---|---|---|
| Day temperature (max.) | +24°C | Sun hours | 14 h |
| UV index | 6 | Cloud cover (avg.) | 14% |
| 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.) | +16°C |
| Heat index (avg.) | +22°C | Wind chill (avg.) | +21°C |
| Wind gusts (max.) | 17 m/s | Wind direction (avg.) | 350° ↖ (NNW) |
Sunrise
06:53
Duration
13 h 37 min
Sunset
20:30
Moonrise
23:41
Moonset
12:48
Moon phase
Waning Gibbous
Illumination
61%
+20°C
Weather archive — for 2021 year
Clear/Sunny
Weather archive — for 2021 year
Nighttime: +18°C
Precipitation: 0 mm
Wind: 9 — 10 m/s
Humidity: 81%
| Metric | Value | Metric | Value |
|---|---|---|---|
| Day temperature (max.) | +23°C | Sun hours | 14 h |
| UV index | 5 | Cloud cover (avg.) | 6% |
| Pressure (avg.) | 764 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.) | +22°C | Wind chill (avg.) | +21°C |
| Wind gusts (max.) | 16 m/s | Wind direction (avg.) | 346° ↖ (NNW) |
Sunrise
06:53
Duration
13 h 36 min
Sunset
20:29
Moonrise
16:13
Moonset
01:02
Moon phase
First Quarter
Illumination
61%
+21°C
Weather archive — for 2020 year
Partly Cloudy
Weather archive — for 2020 year
Nighttime: +19°C
Precipitation: 0.2 mm
Wind: 3 — 4 m/s
Humidity: 90%
| Metric | Value | Metric | Value |
|---|---|---|---|
| Day temperature (max.) | +23°C | Sun hours | 14 h |
| UV index | 5 | Cloud cover (avg.) | 49% |
| Pressure (avg.) | 763 mmHg | Snow (total for the day) | 0 cm |
| Visibility (avg.) | 8 km | Sea temperature | — |
| Feels like (avg.) | +22°C | Dew point (avg.) | +19°C |
| Heat index (avg.) | +22°C | Wind chill (avg.) | +21°C |
| Wind gusts (max.) | 8 m/s | Wind direction (avg.) | 273° ← (W) |
Sunrise
06:53
Duration
13 h 36 min
Sunset
20:29
Moonrise
04:48
Moonset
19:50
Moon phase
Waning Crescent
Illumination
1%
Weather in Cascais on 17 August in previous years
| Year | Day | Nighttime | Average | Sun | UV | Humidity | Wind |
|---|---|---|---|---|---|---|---|
| 2025 |
+23°C
|
+19°C
|
+21°C | 14 h | 6 | 74% | 7 — 9 m/s |
| 2024 |
+24°C
|
+20°C
|
+22°C | 14 h | 6 | 80% | 9 — 9 m/s |
| 2023 |
+23°C
|
+18°C
|
+20°C | 14 h | 6 | 82% | 5 — 6 m/s |
| 2022 |
+24°C
|
+19°C
|
+20°C | 14 h | 6 | 76% | 8 — 11 m/s |
| 2021 |
+23°C
|
+18°C
|
+20°C | 14 h | 5 | 81% | 9 — 10 m/s |
| 2020 |
+23°C
|
+19°C
|
+21°C | 14 h | 5 | 90% | 3 — 4 m/s |