Weather in Aalst on 17 August 2026
Preliminary outlook for 17 August 2026
A preliminary estimate based on the 2019–2025 archive: daytime around +23°C and nighttime around +15°C, average precipitation 0.6 mm, wind around 4 m/s, humidity around 73%.
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.
+17°C
Weather archive — latest year: 2025
Partly Cloudy
Weather archive — latest year: 2025
Nighttime: +10°C
Precipitation: 0 mm
Wind: 4 — 6 m/s
Humidity: 70%
| Metric | Value | Metric | Value |
|---|---|---|---|
| Day temperature (max.) | +25°C | Sun hours | 14 h |
| UV index | 5 | Cloud cover (avg.) | 18% |
| Pressure (avg.) | 767 mmHg | Snow (total for the day) | 0 cm |
| Visibility (avg.) | 10 km | Sea temperature | — |
| Feels like (avg.) | +18°C | Dew point (avg.) | +11°C |
| Heat index (avg.) | +18°C | Wind chill (avg.) | +16°C |
| Wind gusts (max.) | 7 m/s | Wind direction (avg.) | 31° ↑ (NNE) |
Sunrise
06:34
Duration
14 h 26 min
Sunset
21:00
Moonrise
No moonrise
Moonset
17:25
Moon phase
Last Quarter
Illumination
37%
+20°C
Weather archive — for 2024 year
Patchy rain nearby
Weather archive — for 2024 year
Nighttime: +15°C
Precipitation: 1.2 mm
Wind: 3 — 3 m/s
Humidity: 76%
| Metric | Value | Metric | Value |
|---|---|---|---|
| Day temperature (max.) | +26°C | Sun hours | 11 h |
| UV index | 5 | Cloud cover (avg.) | 58% |
| Pressure (avg.) | 761 mmHg | Snow (total for the day) | 0 cm |
| Visibility (avg.) | 6 km | Sea temperature | — |
| Feels like (avg.) | +21°C | Dew point (avg.) | +15°C |
| Heat index (avg.) | +21°C | Wind chill (avg.) | +21°C |
| Wind gusts (max.) | 5 m/s | Wind direction (avg.) | 263° ↙ (SW) |
Sunrise
06:34
Duration
14 h 26 min
Sunset
21:00
Moonrise
20:25
Moonset
02:40
Moon phase
Waxing Gibbous
Illumination
86%
+20°C
Weather archive — for 2023 year
Partly Cloudy
Weather archive — for 2023 year
Nighttime: +16°C
Precipitation: 0 mm
Wind: 4 — 4 m/s
Humidity: 74%
| Metric | Value | Metric | Value |
|---|---|---|---|
| Day temperature (max.) | +24°C | Sun hours | 11 h |
| UV index | 5 | Cloud cover (avg.) | 41% |
| Pressure (avg.) | 764 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.) | +21°C | Wind chill (avg.) | +19°C |
| Wind gusts (max.) | 7 m/s | Wind direction (avg.) | 54° ↗ (ENE) |
Sunrise
06:33
Duration
14 h 28 min
Sunset
21:01
Moonrise
07:17
Moonset
21:48
Moon phase
Waxing Crescent
Illumination
1%
+21°C
Weather archive — for 2022 year
Partly Cloudy
Weather archive — for 2022 year
Nighttime: +17°C
Precipitation: 2.1 mm
Wind: 2 — 3 m/s
Humidity: 69%
| Metric | Value | Metric | Value |
|---|---|---|---|
| Day temperature (max.) | +25°C | Sun hours | 12 h |
| UV index | 5 | Cloud cover (avg.) | 69% |
| Pressure (avg.) | 758 mmHg | Snow (total for the day) | 0 cm |
| Visibility (avg.) | 10 km | Sea temperature | — |
| Feels like (avg.) | +20°C | Dew point (avg.) | +16°C |
| Heat index (avg.) | +21°C | Wind chill (avg.) | +20°C |
| Wind gusts (max.) | 4 m/s | Wind direction (avg.) | 161° → (ESE) |
Sunrise
06:34
Duration
14 h 27 min
Sunset
21:01
Moonrise
23:19
Moonset
13:12
Moon phase
Waning Gibbous
Illumination
61%
+15°C
Weather archive — for 2021 year
Cloudy
Weather archive — for 2021 year
Nighttime: +13°C
Precipitation: 0.2 mm
Wind: 3 — 4 m/s
Humidity: 71%
| Metric | Value | Metric | Value |
|---|---|---|---|
| Day temperature (max.) | +17°C | Sun hours | 12 h |
| UV index | 4 | Cloud cover (avg.) | 64% |
| Pressure (avg.) | 764 mmHg | Snow (total for the day) | 0 cm |
| Visibility (avg.) | 10 km | Sea temperature | — |
| Feels like (avg.) | +15°C | Dew point (avg.) | +11°C |
| Heat index (avg.) | +15°C | Wind chill (avg.) | +15°C |
| Wind gusts (max.) | 10 m/s | Wind direction (avg.) | 306° ↖ (NW) |
Sunrise
06:34
Duration
14 h 27 min
Sunset
21:01
Moonrise
17:39
Moonset
00:37
Moon phase
First Quarter
Illumination
61%
+20°C
Weather archive — for 2020 year
Patchy rain nearby
Weather archive — for 2020 year
Nighttime: +17°C
Precipitation: 0.1 mm
Wind: 4 — 5 m/s
Humidity: 73%
| Metric | Value | Metric | Value |
|---|---|---|---|
| Day temperature (max.) | +24°C | Sun hours | 10 h |
| UV index | 6 | Cloud cover (avg.) | 46% |
| Pressure (avg.) | 757 mmHg | Snow (total for the day) | 0 cm |
| Visibility (avg.) | 10 km | Sea temperature | — |
| Feels like (avg.) | +22°C | Dew point (avg.) | +15°C |
| Heat index (avg.) | +22°C | Wind chill (avg.) | +20°C |
| Wind gusts (max.) | 9 m/s | Wind direction (avg.) | 212° ↓ (SSW) |
Sunrise
06:34
Duration
14 h 26 min
Sunset
21:00
Moonrise
03:57
Moonset
20:36
Moon phase
Waning Crescent
Illumination
1%
+18°C
Weather archive — for 2019 year
Patchy rain nearby
Weather archive — for 2019 year
Nighttime: +16°C
Precipitation: 0.8 mm
Wind: 6 — 7 m/s
Humidity: 78%
| Metric | Value | Metric | Value |
|---|---|---|---|
| Day temperature (max.) | +20°C | Sun hours | 3 h |
| UV index | 4 | Cloud cover (avg.) | 95% |
| Pressure (avg.) | 756 mmHg | Snow (total for the day) | 0 cm |
| Visibility (avg.) | 9 km | Sea temperature | — |
| Feels like (avg.) | +18°C | Dew point (avg.) | +15°C |
| Heat index (avg.) | +18°C | Wind chill (avg.) | +18°C |
| Wind gusts (max.) | 13 m/s | Wind direction (avg.) | 214° ↓ (SSW) |
Sunrise
06:33
Duration
14 h 29 min
Sunset
21:02
Moonrise
22:12
Moonset
08:12
Moon phase
Waxing Gibbous
Illumination
86%
Weather in Aalst on 17 August in previous years
| Year | Day | Nighttime | Average | Sun | UV | Humidity | Wind |
|---|---|---|---|---|---|---|---|
| 2025 |
+25°C
|
+10°C
|
+17°C | 14 h | 5 | 70% | 4 — 6 m/s |
| 2024 |
+26°C
|
+15°C
|
+20°C | 11 h | 5 | 76% | 3 — 3 m/s |
| 2023 |
+24°C
|
+16°C
|
+20°C | 11 h | 5 | 74% | 4 — 4 m/s |
| 2022 |
+25°C
|
+17°C
|
+21°C | 12 h | 5 | 69% | 2 — 3 m/s |
| 2021 |
+17°C
|
+13°C
|
+15°C | 12 h | 4 | 71% | 3 — 4 m/s |
| 2020 |
+24°C
|
+17°C
|
+20°C | 10 h | 6 | 73% | 4 — 5 m/s |
| 2019 |
+20°C
|
+16°C
|
+18°C | 3 h | 4 | 78% | 6 — 7 m/s |