Weather in Cascais on 18 August 2026
Preliminary outlook for 18 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 6 m/s, humidity around 83%.
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.
+20°C
Weather archive — latest year: 2025
Clear/Sunny
Weather archive — latest year: 2025
Nighttime: +19°C
Precipitation: 0 mm
Wind: 8 — 9 m/s
Humidity: 81%
| Metric | Value | Metric | Value |
|---|---|---|---|
| Day temperature (max.) | +22°C | Sun hours | 14 h |
| UV index | 6 | Cloud cover (avg.) | 10% |
| Pressure (avg.) | 763 mmHg | Snow (total for the day) | 0 cm |
| Visibility (avg.) | 10 km | Sea temperature | — |
| Feels like (avg.) | +20°C | Dew point (avg.) | +17°C |
| Heat index (avg.) | +21°C | Wind chill (avg.) | +20°C |
| Wind gusts (max.) | 12 m/s | Wind direction (avg.) | 348° ↖ (NNW) |
Sunrise
06:54
Duration
13 h 34 min
Sunset
20:28
Moonrise
00:57
Moonset
16:58
Moon phase
Last Quarter
Illumination
29%
+21°C
Weather archive — for 2024 year
Clear/Sunny
Weather archive — for 2024 year
Nighttime: +19°C
Sea temperature: +20°C
Precipitation: 0 mm
Wind: 9 — 11 m/s
| Metric | Value | Metric | Value |
|---|---|---|---|
| Day temperature (max.) | +23°C | Sun hours | 14 h |
| UV index | 6 | Cloud cover (avg.) | 17% |
| Pressure (avg.) | 762 mmHg | Snow (total for the day) | 0 cm |
| Visibility (avg.) | 10 km | Sea temperature | +20°C |
| Feels like (avg.) | +23°C | Dew point (avg.) | +18°C |
| Heat index (avg.) | +23°C | Wind chill (avg.) | +22°C |
| Wind gusts (max.) | 16 m/s | Wind direction (avg.) | 352° ↖ (NNW) |
Sunrise
06:54
Duration
13 h 33 min
Sunset
20:27
Moonrise
20:03
Moonset
04:54
Moon phase
Waxing Gibbous
Illumination
93%
+21°C
Weather archive — for 2023 year
Patchy rain nearby
Weather archive — for 2023 year
Nighttime: +19°C
Precipitation: 0.2 mm
Wind: 3 — 4 m/s
Humidity: 87%
| Metric | Value | Metric | Value |
|---|---|---|---|
| Day temperature (max.) | +23°C | Sun hours | 13 h |
| UV index | 6 | Cloud cover (avg.) | 45% |
| Pressure (avg.) | 762 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.) | 7 m/s | Wind direction (avg.) | 262° ↙ (SW) |
Sunrise
06:54
Duration
13 h 34 min
Sunset
20:28
Moonrise
08:57
Moonset
21:51
Moon phase
Waxing Crescent
Illumination
9%
+22°C
Weather archive — for 2022 year
Clear/Sunny
Weather archive — for 2022 year
Nighttime: +18°C
Precipitation: 0 mm
Wind: 7 — 9 m/s
Humidity: 78%
| Metric | Value | Metric | Value |
|---|---|---|---|
| Day temperature (max.) | +26°C | Sun hours | 14 h |
| UV index | 6 | Cloud cover (avg.) | 5% |
| Pressure (avg.) | 762 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.) | 14 m/s | Wind direction (avg.) | 219° ↓ (S) |
Sunrise
06:54
Duration
13 h 34 min
Sunset
20:28
Moonrise
Does not rise today
Moonset
13:57
Moon phase
Last Quarter
Illumination
54%
+19°C
Weather archive — for 2021 year
Clear/Sunny
Weather archive — for 2021 year
Nighttime: +18°C
Precipitation: 0 mm
Wind: 8 — 10 m/s
Humidity: 81%
| Metric | Value | Metric | Value |
|---|---|---|---|
| Day temperature (max.) | +22°C | Sun hours | 14 h |
| UV index | 5 | Cloud cover (avg.) | 2% |
| Pressure (avg.) | 763 mmHg | Snow (total for the day) | 0 cm |
| Visibility (avg.) | 10 km | Sea temperature | — |
| Feels like (avg.) | +20°C | Dew point (avg.) | +15°C |
| Heat index (avg.) | +20°C | Wind chill (avg.) | +20°C |
| Wind gusts (max.) | 16 m/s | Wind direction (avg.) | 346° ↖ (NNW) |
Sunrise
06:54
Duration
13 h 34 min
Sunset
20:28
Moonrise
17:23
Moonset
01:48
Moon phase
Waxing Gibbous
Illumination
69%
+21°C
Weather archive — for 2020 year
Partly Cloudy
Weather archive — for 2020 year
Nighttime: +20°C
Precipitation: 0 mm
Wind: 3 — 4 m/s
Humidity: 89%
| Metric | Value | Metric | Value |
|---|---|---|---|
| Day temperature (max.) | +24°C | Sun hours | 10 h |
| UV index | 5 | Cloud cover (avg.) | 51% |
| Pressure (avg.) | 763 mmHg | Snow (total for the day) | 0 cm |
| Visibility (avg.) | 10 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.) | 294° ← (WNW) |
Sunrise
06:54
Duration
13 h 34 min
Sunset
20:28
Moonrise
05:50
Moonset
20:29
Moon phase
New Moon
Illumination
0%
Weather in Cascais on 18 August in previous years
| Year | Day | Nighttime | Average | Sun | UV | Humidity | Wind |
|---|---|---|---|---|---|---|---|
| 2025 |
+22°C
|
+19°C
|
+20°C | 14 h | 6 | 81% | 8 — 9 m/s |
| 2024 |
+23°C
|
+19°C
|
+21°C | 14 h | 6 | 81% | 9 — 11 m/s |
| 2023 |
+23°C
|
+19°C
|
+21°C | 13 h | 6 | 87% | 3 — 4 m/s |
| 2022 |
+26°C
|
+18°C
|
+22°C | 14 h | 6 | 78% | 7 — 9 m/s |
| 2021 |
+22°C
|
+18°C
|
+19°C | 14 h | 5 | 81% | 8 — 10 m/s |
| 2020 |
+24°C
|
+20°C
|
+21°C | 10 h | 5 | 89% | 3 — 4 m/s |