Surf Forecasts:
Rossnowlagh surf forecast from 15 Aug 2026:
- Best quality surf: Friday 21 Aug, 7AM (local time) - 3ft (0.9m), 8s period, WNW swell with glassy winds.
- Most powerful swell: Wednesday 19 Aug, 10PM (local time) - 11ft (3.5m), 11s period, W swell with 2,621 kJ wave energy.
- Next surfable swell (1★+): Friday 21 Aug, 7AM (local time) - 3ft (0.9m), 8s period with WNW swell.
Best Forecast Surf Conditions for Rossnowlagh this week:
The surf forecast for Rossnowlagh over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Friday (Aug 21) at 7AM. The primary swell is predicted to be 0.9m and 8s period. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Rossnowlagh in the next 16 days are 3.5m 11s and forecast to arrive on Wednesday (Aug 19) at 10PM. Winds are predicted to be onshore at the time the swell arrives.
| Wave Type | Time (IST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 7AM (Fri 21st Aug) | 3ft (0.9m) 8s |
| Best Surf | 7AM (Fri 21st Aug) | 3ft (0.9m) 8s |
| Most Powerful | 10PM (Wed 19th Aug) | 11ft (3.5m) 11s |
Table - best surf conditions forecast for Rossnowlagh over the next 16 days.
Short Range ForecastModerate rain (total 10mm), heaviest on Mon afternoon. Very mild (max 17°C on Mon afternoon, min 12°C on Fri night). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 20mm), heaviest during Wed afternoon. Very mild (max 17°C on Mon night, min 13°C on Tue night). Mainly fresh winds. | ||||||||||||||||||||
Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | |||||||||||||||
AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||||
Wave Height (m) Direction Period (s) | WNW 8 | WNW 8 | WNW 8 | WNW 8 | W 7 | W 8 | W 8 | W 7 | W 7 | W 8 | W 9 | W 10 | W 10 | W 11 | W 11 | WNW 10 | WNW 9 | WNW 8 | WNW 8 | WNW 7 | WNW 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 83 | 83 | 54 | 37 | 44 | 112 | 105 | 52 | 155 | 224 | 325 | 720 | 1154 | 1736 | 2323 | 990 | 465 | 160 | 87 | 78 | 41 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | glassy | cross-off | cross | on | cross-on | cross-on | on | on | on | on | cross-on | on | on | cross-on | cross-on | cross-on | cross | cross | cross |
High Tide | 8:18AM3.41m | 8:33PM3.97m | 8:56AM3.32m | 9:11PM3.73m | 9:33AM3.18m | 9:49PM3.41m | 10:11AM3.01m | 10:28PM3.06m | 10:53AM2.80m | 11:13PM2.71m | 11:43AM2.60m | 00:10AM2.43m | 12:54PM2.45m | 1:36AM2.26m | |||||||
Low Tide | 2:06PM0.05m | 2:44AM0.04m | 2:44PM0.19m | 3:20AM0.25m | 3:23PM0.40m | 3:55AM0.51m | 4:04PM0.67m | 4:32AM0.79m | 4:49PM0.96m | 5:15AM1.06m | 5:47PM1.22m | 6:16AM1.29m | 7:19PM1.40m | ||||||||
 |  |  | | |  |  |  | | | |  |  | | | | |  | | |  | |
 | 6:07 | — | — | 6:09 | — | — | 6:11 | — | — | 6:13 | — | — | 6:15 | — | — | 6:16 | — | — | 6:18 | — | — |
 | — | — | 9:05 | — | — | 9:02 | — | — | 9:00 | — | 8:59 | — | — | 8:55 | — | — | 8:53 | — | — | 8:52 | — |
mm | — | — | 1 | — | — | — | 3 | 6 | 1 | — | 1 | 4 | 2 | 3 | 6 | 2 | 1 | — | — | — | — |
Temp °C | 15 | 15 | 14 | 14 | 14 | 15 | 15 | 17 | 17 | 16 | 16 | 14 | 14 | 14 | 14 | 16 | 16 | 13 | 15 | 15 | 12 |
Feels °C | 12 | 12 | 14 | 12 | 13 | 14 | 14 | 16 | 16 | 13 | 13 | 11 | 9 | 9 | 8 | 12 | 12 | 12 | 11 | 10 | 10 |
Swell 1 Height (m) Direction Period (s) | WNW 8 | WNW 8 | WNW 8 | WNW 8 | W 7 | W 10 | W 8 | W 7 | — | — | W 9 | — | — | — | — | — | — | WNW 8 | WNW 8 | — | WNW 7 |
| kJ | 83 | 83 | 54 | 37 | 44 | 18 | 105 | 52 | — | — | 325 | — | — | — | — | — | — | 160 | 87 | — | 41 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | NW 8 | NW 7 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | W 8 |
| kJ | — | — | — | — | 9 | 8 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 6 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | SSW 2 | SSW 3 | W 8 | — | — | W 7 | W 8 | — | W 10 | W 10 | W 11 | W 11 | WNW 10 | WNW 9 | — | — | WNW 7 | — |
| kJ | — | — | — | 1 | 2 | 112 | — | — | 155 | 224 | — | 720 | 1154 | 1736 | 2323 | 990 | 465 | — | — | 78 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 73 | 703 | 48 | 28 | 9 | 48 | 21 | 9 | 287 | 302 | 284 | 123 | 123 | 494 | 123 | 182 | 425 | 182 | 38 | 168 | 128 |
Best forecast wave conditions in Donegal | |||||||||||||||||||||
Best forecast wave conditions in Ireland | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Rossnowlagh surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
Information about the Rossnowlagh Surf forecast
The above surf forecast table for Rossnowlagh provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Rossnowlagh can be found by selecting the local surf guide option on the grey menu. Our Rossnowlagh surf forecast is unique since it includes wave energy (power) that defines the real feel of the surf rather than just the height or the period. If you surf the same spot (Rossnowlagh) regularly then make a mental note of the wave energy from the surf forecast table each time you go. Very soon you may start to choose your surf days based on the wave energy alone combined with our forecast of favourable offshore wind conditions. Our star ratings will help here and of course you will also find the usual wave height and period predictions on our surf forecasts as well as a full break down of the swell components under our advanced users option (to reveal that, click the little Einstein character under the tide times).
Further information to help with frequently asked questions about our surf forecast for Rossnowlagh may be found under the help tab on the top menu and also by moving your mouse over the question marks on the surf forecast table itself. Please always bear in mind that the forecast is for near-shore open water and local factors at each surf break influence the actual breaking wave height, such as the beach / reef profile, water depths offshore and shelter.
Rossnowlagh is 17 km (11 miles) from Killybegs. If you plan a holiday in Donegal, look for hotels and other accommodation in Killybegs. Killybegs has rooms for a wide range of budgets as well as car hire and transport links.
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