Weather in Barreiro on 18 August 2026
Preliminary outlook for 18 August 2026
A preliminary estimate based on the 2020–2025 archive: daytime around +27°C and nighttime around +18°C, average precipitation 0 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.
+22°C
Weather archive — latest year: 2025
Partly Cloudy
Weather archive — latest year: 2025
Nighttime: +18°C
Precipitation: 0 mm
Wind: 6 — 8 m/s
Humidity: 64%
| Metric | Value | Metric | Value |
|---|---|---|---|
| Day temperature (max.) | +27°C | Sun hours | 11 h |
| UV index | 6 | Cloud cover (avg.) | 25% |
| Pressure (avg.) | 763 mmHg | Snow (total for the day) | 0 cm |
| Visibility (avg.) | 10 km | Sea temperature | — |
| Feels like (avg.) | +23°C | Dew point (avg.) | +15°C |
| Heat index (avg.) | +23°C | Wind chill (avg.) | +22°C |
| Wind gusts (max.) | 11 m/s | Wind direction (avg.) | 342° ↖ (NNW) |
Sunrise
06:53
Duration
13 h 33 min
Sunset
20:26
Moonrise
00:56
Moonset
16:57
Moon phase
Last Quarter
Illumination
29%
+23°C
Weather archive — for 2024 year
Clear/Sunny
Weather archive — for 2024 year
Nighttime: +19°C
Sea temperature: +20°C
Precipitation: 0 mm
Wind: 7 — 9 m/s
| Metric | Value | Metric | Value |
|---|---|---|---|
| Day temperature (max.) | +28°C | Sun hours | 14 h |
| UV index | 6 | Cloud cover (avg.) | 2% |
| Pressure (avg.) | 761 mmHg | Snow (total for the day) | 0 cm |
| Visibility (avg.) | 10 km | Sea temperature | +20°C |
| Feels like (avg.) | +24°C | Dew point (avg.) | +17°C |
| Heat index (avg.) | +25°C | Wind chill (avg.) | +24°C |
| Wind gusts (max.) | 14 m/s | Wind direction (avg.) | 349° ↖ (NNW) |
Sunrise
06:53
Duration
13 h 33 min
Sunset
20:26
Moonrise
20:01
Moonset
04:52
Moon phase
Waxing Gibbous
Illumination
93%
+22°C
Weather archive — for 2023 year
Clear/Sunny
Weather archive — for 2023 year
Nighttime: +19°C
Precipitation: 0 mm
Wind: 3 — 4 m/s
Humidity: 80%
| Metric | Value | Metric | Value |
|---|---|---|---|
| Day temperature (max.) | +26°C | Sun hours | 13 h |
| UV index | 6 | Cloud cover (avg.) | 23% |
| Pressure (avg.) | 762 mmHg | Snow (total for the day) | 0 cm |
| Visibility (avg.) | 8 km | Sea temperature | — |
| Feels like (avg.) | +23°C | Dew point (avg.) | +18°C |
| Heat index (avg.) | +23°C | Wind chill (avg.) | +22°C |
| Wind gusts (max.) | 8 m/s | Wind direction (avg.) | 267° ↙ (WSW) |
Sunrise
06:52
Duration
13 h 35 min
Sunset
20:27
Moonrise
08:56
Moonset
21:50
Moon phase
Waxing Crescent
Illumination
9%
+23°C
Weather archive — for 2022 year
Clear/Sunny
Weather archive — for 2022 year
Nighttime: +17°C
Precipitation: 0 mm
Wind: 5 — 6 m/s
Humidity: 66%
| Metric | Value | Metric | Value |
|---|---|---|---|
| Day temperature (max.) | +31°C | Sun hours | 14 h |
| UV index | 6 | Cloud cover (avg.) | 1% |
| Pressure (avg.) | 761 mmHg | Snow (total for the day) | 0 cm |
| Visibility (avg.) | 10 km | Sea temperature | — |
| Feels like (avg.) | +23°C | Dew point (avg.) | +15°C |
| Heat index (avg.) | +23°C | Wind chill (avg.) | +23°C |
| Wind gusts (max.) | 11 m/s | Wind direction (avg.) | 214° ↘ (SSE) |
Sunrise
06:53
Duration
13 h 34 min
Sunset
20:27
Moonrise
Does not rise today
Moonset
13:55
Moon phase
Last Quarter
Illumination
54%
+21°C
Weather archive — for 2021 year
Clear/Sunny
Weather archive — for 2021 year
Nighttime: +17°C
Precipitation: 0 mm
Wind: 4 — 7 m/s
Humidity: 68%
| Metric | Value | Metric | Value |
|---|---|---|---|
| Day temperature (max.) | +26°C | Sun hours | 14 h |
| UV index | 6 | Cloud cover (avg.) | 0% |
| Pressure (avg.) | 762 mmHg | Snow (total for the day) | 0 cm |
| Visibility (avg.) | 10 km | Sea temperature | — |
| Feels like (avg.) | +22°C | Dew point (avg.) | +14°C |
| Heat index (avg.) | +22°C | Wind chill (avg.) | +22°C |
| Wind gusts (max.) | 11 m/s | Wind direction (avg.) | 335° ↖ (NNW) |
Sunrise
06:53
Duration
13 h 33 min
Sunset
20:26
Moonrise
17:22
Moonset
01:47
Moon phase
Waxing Gibbous
Illumination
69%
+22°C
Weather archive — for 2020 year
Partly Cloudy
Weather archive — for 2020 year
Nighttime: +19°C
Precipitation: 0 mm
Wind: 3 — 5 m/s
Humidity: 82%
| Metric | Value | Metric | Value |
|---|---|---|---|
| Day temperature (max.) | +25°C | Sun hours | 11 h |
| UV index | 6 | Cloud cover (avg.) | 40% |
| Pressure (avg.) | 763 mmHg | Snow (total for the day) | 0 cm |
| Visibility (avg.) | 10 km | Sea temperature | — |
| Feels like (avg.) | +23°C | Dew point (avg.) | +18°C |
| Heat index (avg.) | +23°C | Wind chill (avg.) | +22°C |
| Wind gusts (max.) | 9 m/s | Wind direction (avg.) | 290° ← (WNW) |
Sunrise
06:53
Duration
13 h 33 min
Sunset
20:26
Moonrise
05:49
Moonset
20:27
Moon phase
New Moon
Illumination
0%
Weather in Barreiro on 18 August in previous years
| Year | Day | Nighttime | Average | Sun | UV | Humidity | Wind |
|---|---|---|---|---|---|---|---|
| 2025 |
+27°C
|
+18°C
|
+22°C | 11 h | 6 | 64% | 6 — 8 m/s |
| 2024 |
+28°C
|
+19°C
|
+23°C | 14 h | 6 | 65% | 7 — 9 m/s |
| 2023 |
+26°C
|
+19°C
|
+22°C | 13 h | 6 | 80% | 3 — 4 m/s |
| 2022 |
+31°C
|
+17°C
|
+23°C | 14 h | 6 | 66% | 5 — 6 m/s |
| 2021 |
+26°C
|
+17°C
|
+21°C | 14 h | 6 | 68% | 4 — 7 m/s |
| 2020 |
+25°C
|
+19°C
|
+22°C | 11 h | 6 | 82% | 3 — 5 m/s |