Surf Forecasts:
Valnäs - Nord Koster surf forecast from 15 Sep 2026:
- Best quality surf: Thursday 17 Sep, 2AM (local time) - 4.5ft (1.3m), 7s period, SW swell with cross-offshore winds.
- Most powerful swell: Saturday 19 Sep, 5PM (local time) - 8ft (2.5m), 7s period, SW swell with 667 kJ wave energy.
- Next surfable swell (1★+): Thursday 17 Sep, 2AM (local time) - 4.5ft (1.3m), 7s period with SW swell.
Best Forecast Surf Conditions for Valnäs - Nord Koster this week:
The surf forecast for Valnäs - Nord Koster over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Sep 17) at 2AM. The primary swell is predicted to be 1.3m and 7s period. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Valnäs - Nord Koster in the next 16 days are 2.5m 7s and forecast to arrive on Saturday (Sep 19) at 5PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.9m 6s period and expected on Wednesday (Sep 16) at 5AM.
| Wave Type | Time (CEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Thu 17th Sep) | 4.5ft (1.3m) 7s |
| Best Surf | 2AM (Thu 17th Sep) | 4.5ft (1.3m) 7s |
| Most Powerful | 5PM (Sat 19th Sep) | 8ft (2.5m) 7s |
Table - best surf conditions forecast for Valnäs - Nord Koster over the next 16 days.
Short Range ForecastModerate rain (total 11mm), heaviest on Tue night. Very mild (max 17°C on Wed night, min 13°C on Mon afternoon). Winds decreasing (strong winds from the S on Tue afternoon, light winds from the NNE by Wed night). | Days 5-7 Weather SummaryLight rain (total 2mm), mostly falling on Thu night. Very mild (max 16°C on Fri night, min 13°C on Fri night). Winds increasing (moderate winds from the SW on Thu night, strong winds from the WSW by Sat night). | |||||||||||||||||||
Mon 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | ||||||||||||||
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) | SW 6 | SW 6 | SSW 5 | SSW 5 | SW 6 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 6 | SW 6 | SW 6 | SW 7 | SW 6 | SW 7 | SW 7 | SW 6 | SW 6 | SW 6 |
Wave Graph  | ||||||||||||||||||||
 kJ | 6 | 0 | 0 | 0 | 203 | 374 | 574 | 153 | 73 | 100 | 0 | 244 | 184 | 337 | 271 | 498 | 261 | 177 | 187 | 216 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross | cross-off | cross-off | cross | cross | cross | cross-off | off | cross | cross | cross | cross | cross-on | cross | cross | cross-on | cross-on | cross-on | cross-on |
High Tide | 8:32PM0.26m | 8:59AM0.22m | 9:42PM0.26m | 10:06AM0.22m | 10:49PM0.27m | 11:09AM0.24m | 11:50PM0.28m | 12:05PM0.25m | 00:43AM0.30m | 12:54PM0.27m | 1:28AM0.31m | 1:37PM0.28m | 2:08AM0.31m | |||||||
Low Tide | 1:48AM0.07m | 2:01PM0.06m | 2:51AM0.10m | 3:04PM0.09m | 4:22AM0.13m | 4:24PM0.10m | 6:36AM0.13m | 5:59PM0.10m | 7:28AM0.13m | 7:02PM0.10m | 7:59AM0.12m | 7:42PM0.08m | ||||||||
 |  |  |  |  | |  | | | | | |  | | | | | | | | |
 | — | — | 6:43 | — | — | 6:45 | — | — | 6:47 | — | — | 6:50 | — | — | 6:52 | — | — | 6:54 | — | — |
 | 7:39 | — | — | 7:37 | — | — | 7:35 | — | — | 7:31 | — | — | 7:29 | — | — | 7:25 | — | — | 7:22 | — |
mm | — | — | — | 2 | 6 | — | 2 | 1 | — | — | 2 | — | — | — | — | — | — | — | — | — |
Temp °C | 14 | 14 | 14 | 16 | 16 | 14 | 16 | 17 | 14 | 14 | 14 | 14 | 15 | 16 | 14 | 15 | 15 | 13 | 16 | 15 |
Feels °C | 11 | 11 | 8 | 10 | 9 | 6 | 12 | 15 | 12 | 7 | 7 | 8 | 8 | 9 | 7 | 8 | 7 | 4 | 6 | 5 |
Swell 1 Height (m) Direction Period (s) | SW 6 | — | — | — | — | — | — | SW 7 | SW 7 | — | — | — | — | — | — | — | S 6 | S 6 | S 5 | — |
| kJ | 6 | — | — | — | — | — | — | 153 | 73 | — | — | — | — | — | — | — | 16 | 1 | 2 | — |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | SW 6 | SSW 5 | SSW 5 | SW 6 | SW 7 | SW 7 | — | — | SW 7 | SW 6 | SW 6 | SW 6 | SW 7 | SW 6 | SW 7 | SW 7 | SW 6 | SW 6 | SW 6 |
| kJ | — | 67 | 64 | 94 | 203 | 374 | 574 | — | — | 100 | 147 | 244 | 184 | 337 | 271 | 498 | 261 | 177 | 187 | 216 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 479 | 479 | 482 | 482 | 938 | 1273 | 845 | 0 | 479 | 482 | 479 | 479 | 938 | 498 | 498 | 904 | 938 | 1124 | 938 | 809 |
Best forecast wave conditions in Kattegat and Skagerrack | ||||||||||||||||||||
Best forecast wave conditions in Sweden | ||||||||||||||||||||
Header Global | ||||||||||||||||||||
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Information about the Valnäs - Nord Koster Surf forecast
The above surf forecast table for Valnäs - Nord Koster provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Valnäs - Nord Koster can be found by selecting the local surf guide option on the grey menu. Our Valnäs - Nord Koster 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 (Valnäs - Nord Koster) 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 Valnäs - Nord Koster 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.
Valnäs - Nord Koster is 32 km (20 miles) from Fredrikstad. If you plan a holiday in Kattegat and Skagerrack, look for hotels and other accommodation in Fredrikstad. Fredrikstad has rooms for a wide range of budgets as well as car hire and transport links.
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