Surf Forecasts:
Downhill surf forecast from 18 Sep 2026:
- Best quality surf: Sunday 20 Sep, 7PM (local time) - 5.5ft (1.7m), 11s period, NW swell with cross-offshore winds.
- Most powerful swell: Friday 18 Sep, 7AM (local time) - 8ft (2.5m), 13s period, NW swell with 2,511 kJ wave energy.
- Next surfable swell (1★+): Sunday 20 Sep, 7PM (local time) - 5.5ft (1.7m), 11s period with NW swell.
Best Forecast Surf Conditions for Downhill this week:
The surf forecast for Downhill over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Sep 20) at 7PM. The primary swell is predicted to be 1.7m and 11s period. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Downhill in the next 16 days are 2.5m 13s and forecast to arrive on Friday (Sep 18) at 7AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 4s period and expected on Thursday (Sep 24) at 10PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 7PM (Sun 20th Sep) | 5.5ft (1.7m) 11s |
| Best Surf | 7PM (Sun 20th Sep) | 5.5ft (1.7m) 11s |
| Most Powerful | 7AM (Fri 18th Sep) | 8ft (2.5m) 13s |
Table - best surf conditions forecast for Downhill over the next 16 days.
Short Range ForecastLight rain (total 6mm), mostly falling on Fri morning. Very mild (max 16°C on Fri afternoon, min 12°C on Sat night). Winds decreasing (fresh winds from the W on Thu night, light winds from the SSW by Sun afternoon). | Days 4-6 Weather SummaryModerate rain (total 19mm), heaviest on Wed morning. Warm (max 21°C on Mon afternoon, min 10°C on Sun night). Winds increasing (calm on Tue morning, fresh winds from the N by Wed morning). | ||||||||||||||||||||
Friday 18 | Saturday 19 | Sunday 20 | Monday 21 | Tuesday 22 | Wednesday 23 | Thursday 24 | |||||||||||||||
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) | NW 13 | NW 12 | NW 11 | NW 11 | NW 12 | NW 12 | NW 12 | NW 12 | NW 13 | NW 12 | NW 11 | WNW 11 | WNW 11 | WNW 10 | NW 15 | NW 14 | NW 13 | NW 12 | NW 11 | NW 10 | NW 11 |
Wave Graph  | |||||||||||||||||||||
 kJ | 1952 | 954 | 638 | 593 | 1420 | 1521 | 1193 | 876 | 710 | 349 | 233 | 143 | 74 | 57 | 551 | 564 | 431 | 389 | 224 | 173 | 96 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-off | cross | cross-on | cross-off | cross-off | cross-on | cross-on | cross-on | on | glassy | off | cross-off | cross |
High Tide | 10:53AM1.54m | 11:12PM1.33m | 12:17PM1.39m | 1:39AM1.21m | 3:22PM1.42m | 3:58AM1.31m | 4:26PM1.59m | 4:41AM1.45m | 5:01PM1.76m | 5:12AM1.60m | 5:30PM1.93m | 5:40AM1.74m | 5:58PM2.09m | ||||||||
Low Tide | 4:45AM0.75m | 5:37PM0.86m | 5:51AM0.90m | 7:38PM0.98m | 8:03AM0.93m | 9:51PM0.90m | 9:46AM0.80m | 10:48PM0.74m | 10:38AM0.62m | 11:23PM0.56m | 11:14AM0.44m | 11:52PM0.39m | 11:44AM0.28m | 00:19AM0.24m | |||||||
 | |  |  | |  | |  | |  | | | | |  |  | |  | | | | |
 | 7:03 | — | — | 7:05 | — | — | 7:07 | — | — | 7:09 | — | — | 7:11 | — | — | 7:13 | — | — | 7:15 | — | — |
 | — | 7:37 | — | — | 7:35 | — | — | 7:31 | — | — | 7:30 | — | — | 7:27 | — | — | 7:24 | — | — | 7:22 | — |
mm | 3 | 2 | 1 | — | — | — | — | — | 3 | — | — | — | — | — | — | 16 | — | — | — | — | — |
Temp °C | 13 | 16 | 16 | 14 | 14 | 12 | 14 | 14 | 17 | 20 | 21 | 19 | 18 | 18 | 13 | 12 | 11 | 10 | 16 | 20 | 17 |
Feels °C | 8 | 12 | 12 | 7 | 7 | 5 | 9 | 11 | 16 | 18 | 21 | 19 | 18 | 17 | 12 | 8 | 7 | 7 | 11 | 18 | 17 |
Swell 1 Height (m) Direction Period (s) | NW 13 | NW 12 | NW 11 | NW 11 | NW 12 | NW 12 | NW 12 | NW 12 | NW 13 | NW 12 | NW 11 | WNW 11 | WNW 11 | WNW 10 | NW 15 | NW 14 | NW 13 | NW 12 | NW 11 | NW 10 | NW 11 |
| kJ | 1952 | 954 | 638 | 593 | 1420 | 1521 | 1193 | 876 | 710 | 349 | 233 | 143 | 74 | 57 | 551 | 564 | 431 | 389 | 224 | 173 | 96 |
Swell 2 Height (m) Direction Period (s) | — | SSE 4 | — | — | — | — | — | — | — | — | — | — | WNW 9 | — | — | — | — | — | — | — | — |
| kJ | — | 3 | — | — | — | — | — | — | — | — | — | — | 32 | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SW 3 | SW 3 | — | W 4 | — | — | — | — | — | SSW 2 | — | — | — | — | — | N 4 | NNW 4 | — | — | ESE 3 | SE 4 |
| kJ | 5 | 6 | — | 18 | — | — | — | — | — | 1 | — | — | — | — | — | 7 | 13 | — | — | 7 | 14 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 781 | 385 | 752 | 379 | 302 | 363 | 159 | 4 | 4 | 13 | 4 | 0 | 0 | 68 | 37 | 74 | 104 | 0 | 0 | 380 | 4 |
Best forecast wave conditions in Londonderry | |||||||||||||||||||||
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 Downhill 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 Downhill Surf forecast
The above surf forecast table for Downhill provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Downhill can be found by selecting the local surf guide option on the grey menu. Our Downhill 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 (Downhill) 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 Downhill 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.
Are you planning a holiday in Londonderry? If you are looking for accommodation near Downhill, camping, hotels and holiday cottages in Londonderry, consider staying in Coleraine which is 11 km (7 miles) away. Other places in and around Londonderry where you can find information about places to rent, and car hire include Derry which is 36 km (22 miles) away, Londonderry County Borough, Ballycastle and Derry.
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