Surf Forecasts:
Rossnowlagh surf forecast from 15 Sep 2026:
- Best quality surf: Sunday 20 Sep, 1PM (local time) - 5ft (1.6m), 12s period, WNW swell with cross-offshore winds.
- Most powerful swell: Thursday 17 Sep, 7PM (local time) - 13ft (4.0m), 15s period, WNW swell with 7,391 kJ wave energy.
- Next surfable swell (1★+): Sunday 20 Sep, 1PM (local time) - 5ft (1.6m), 12s 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 Sunday (Sep 20) at 1PM. The primary swell is predicted to be 1.6m and 12s period with a secondary swell of 0.4m and 3s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Rossnowlagh in the next 16 days are 4.0m 15s and forecast to arrive on Thursday (Sep 17) at 7PM. 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+) | 1PM (Sun 20th Sep) | 5ft (1.6m) 12s |
| Best Surf | 1PM (Sun 20th Sep) | 5ft (1.6m) 12s |
| Most Powerful | 7PM (Thu 17th Sep) | 13ft (4.0m) 15s |
Table - best surf conditions forecast for Rossnowlagh over the next 16 days.
Short Range ForecastModerate rain (total 17mm), heaviest on Wed night. Very mild (max 15°C on Tue afternoon, min 12°C on Tue night). Winds increasing (light winds from the W on Wed morning, fresh winds from the W by Thu morning). | Days 4-6 Weather SummaryLight rain (total 3mm), mostly falling on Fri night. Very mild (max 17°C on Sun night, min 11°C on Sat night). Wind will be generally light. | ||||||||||||||||||||
Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | Monday 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) | W 7 | W 9 | WNW 12 | W 11 | WNW 10 | W 9 | W 11 | WNW 14 | WNW 14 | WNW 13 | WNW 12 | W 11 | W 10 | WNW 10 | W 10 | WNW 11 | W 12 | W 12 | WNW 11 | W 11 | W 11 |
Wave Graph  | |||||||||||||||||||||
 kJ | 428 | 388 | 1029 | 657 | 342 | 554 | 2193 | 5725 | 5036 | 2402 | 1347 | 707 | 459 | 322 | 369 | 681 | 870 | 761 | 478 | 449 | 394 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross-on | on | cross-on | on | on | on | on | cross-on | cross | on | on | on | on | cross | cross | cross-on | cross | cross-on | glassy |
High Tide | 9:10PM3.24m | 9:28AM3.12m | 9:45PM2.92m | 10:04AM2.89m | 10:25PM2.60m | 10:51AM2.65m | 11:20PM2.32m | 12:02PM2.45m | 00:52AM2.14m | 1:49PM2.41m | 2:43AM2.19m | 3:18PM2.58m | 3:54AM2.38m | ||||||||
Low Tide | 2:51PM0.39m | 3:09AM0.52m | 3:28PM0.65m | 3:41AM0.80m | 4:08PM0.94m | 4:19AM1.08m | 5:00PM1.23m | 5:12AM1.33m | 6:33PM1.45m | 6:55AM1.47m | 8:45PM1.41m | 8:50AM1.37m | 9:54PM1.19m | ||||||||
 | |  |  |  |  | | | | |  | | | |  | | | | | | | |
 | 7:03 | — | — | 7:05 | — | — | 7:07 | — | — | 7:09 | — | — | 7:11 | — | — | 7:13 | — | — | 7:15 | — | — |
 | — | 7:50 | — | — | 7:47 | — | — | 7:45 | — | — | 7:43 | — | — | 7:39 | — | — | 7:37 | — | — | 7:35 | — |
mm | 4 | 1 | — | — | 1 | 6 | 2 | 2 | 1 | — | — | 3 | — | — | — | — | — | — | — | — | — |
Temp °C | 14 | 15 | 13 | 14 | 14 | 15 | 13 | 13 | 13 | 14 | 16 | 15 | 15 | 15 | 13 | 13 | 16 | 17 | 19 | 20 | 17 |
Feels °C | 10 | 10 | 9 | 9 | 10 | 10 | 5 | 6 | 8 | 12 | 13 | 12 | 10 | 10 | 9 | 11 | 15 | 17 | 18 | 19 | 18 |
Swell 1 Height (m) Direction Period (s) | — | NW 11 | — | — | WNW 10 | — | — | — | — | — | WNW 12 | W 11 | — | WNW 10 | W 10 | WNW 11 | W 12 | W 12 | WNW 11 | W 11 | W 11 |
| kJ | — | 5 | — | — | 342 | — | — | — | — | — | 1347 | 707 | — | 322 | 369 | 681 | 870 | 761 | 478 | 449 | 394 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | W 7 | W 9 | WNW 12 | W 11 | SW 3 | W 9 | W 11 | WNW 14 | WNW 14 | WNW 13 | — | — | W 10 | — | — | — | — | — | S 3 | SSW 3 | — |
| kJ | 428 | 388 | 1029 | 657 | 7 | 554 | 2193 | 5725 | 5036 | 2402 | — | — | 459 | — | — | — | — | — | 3 | 2 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 494 | 733 | 399 | 233 | 123 | 434 | 439 | 1065 | 399 | 284 | 66 | 123 | 284 | 284 | 71 | 8 | 8 | 8 | 8 | 48 | 0 |
Best forecast wave conditions in Donegal | |||||||||||||||||||||
Best forecast wave conditions in Ireland | |||||||||||||||||||||
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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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