- Forecast
- Maps
- Live
- Weather State
- Spot Information
Cape Northumberland Surf Forecast
/ SA – East Coast (28 breaks) / South Australia (91 breaks) /
Cape Northumberland surfForecast / SA – East Coast / Australia
12 Day Weather and Surf, issued 8 pm Tuesday 12 Aug 2025 ACST
Best Forecast Surf Conditions for Cape Northumberland this week:
The surf forecast for Cape Northumberland over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Aug 14) at 3AM. The primary swell is predicted to be 2.1m and 12s period. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Cape Northumberland in the next 12 days are 4.5m 13s and forecast to arrive on Sunday (Aug 17) at 6AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 4s period and expected on Thursday (Aug 14) at 12PM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Thu 14th Aug) | 7ft (2.1m) 12s |
| Best Surf | 3AM (Thu 14th Aug) | 7ft (2.1m) 12s |
| Most Powerful | 6AM (Sun 17th Aug) | 15ft (4.5m) 13s |
Table - best surf conditions forecast for Cape Northumberland over the next 12 days.
Short Range Forecast Light rain (total 9mm), mostly falling on Fri morning. Very mild (max 15°C on Thu afternoon, min 10°C on Thu morning). Winds increasing (light winds from the NW on Wed night, near gales from the W by Fri afternoon). | Days 3-6 Weather Summary Heavy rain (total 24mm), heaviest during Sat night. Very mild (max 12°C on Sat afternoon, min 10°C on Fri night). Winds decreasing (strong winds from the WSW on Fri night, moderate winds from the S by Mon afternoon). | |||||||||||||||||||||
Wednesday 13 | Thursday 14 | Friday 15 | Saturday 16 | Sunday 17 | Monday 18 | Tue 19 | ||||||||||||||||
| Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | ||
Rating (10 max) | ||||||||||||||||||||||
Swell Height Map |  |  |  |  |  |  |  |  | ||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||
| Period(s) (?) | 13 | 14 | 13 | 13 | 12 | 12 | 12 | 12 | 11 | 13 | 13 | 14 | 14 | 13 | 13 | 13 | 12 | 12 | 12 | 14 | 14 | |
Wave (?)Graph  | ||||||||||||||||||||||
| Energy (?) | 1164 | 2004 | 1811 | 1348 | 1225 | 1087 | 751 | 2692 | 2704 | 6081 | 6681 | 10690 | 10940 | 9718 | 8555 | 5845 | 4884 | 2776 | 2310 | 1972 | 1775 | |
Wind (km/h) | ||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | on | on | on | cross | cross- off | cross- off | cross- off | cross- on | cross- on | on | on | cross- on | on | on | cross- on | cross- on | cross | cross | cross- off | off | cross- on | |
High Tide / height (m) | 2:03AM 0.83 | 2:31PM 0.95 | 2:34AM 0.88 | 2:35PM 0.87 | 3:09AM 0.90 | 2:31PM 0.80 | 3:49AM 0.89 | 2:15PM 0.78 | 4:39AM 0.85 | 1:43PM 0.80 | 6:16AM 0.79 | 1:02PM 0.87 | 12:39PM 0.95 | |||||||||
Low Tide / height (m) | 8:07AM 0.30 | 8:39PM 0.38 | 8:38AM 0.37 | 8:46PM 0.31 | 9:05AM 0.46 | 8:58PM 0.24 | 9:26AM 0.58 | 9:14PM 0.19 | 9:33AM 0.70 | 9:34PM 0.16 | 8:05AM 0.79 | 9:57PM 0.17 | ||||||||||
Wednesday 13 | Thursday 14 | Friday 15 | Saturday 16 | Sunday 17 | Monday 18 | Tue 19 | ||||||||||||||||
| Sunrise | - | 6:56 | - | - | 6:54 | - | - | 6:52 | - | - | 6:52 | - | - | 6:50 | - | - | 6:48 | - | - | 6:48 | - | |
| Sunset | - | - | 5:29 | - | - | 5:29 | - | - | 5:30 | - | - | 5:30 | - | - | 5:31 | - | - | 5:32 | - | - | 5:34 | |
 |  | | |  |  |  |  |  |  | | |  | | | | | | | | | ||
Rain (mm) | - | - | - | - | - | - | 2 | 6 | 1 | 3 | - | 1 | 12 | 2 | 4 | 2 | - | - | 1 | - | - | |
| Temp. °C | 12 | 12 | 13 | 13 | 14 | 15 | 15 | 13 | 12 | 10 | 11 | 12 | 12 | 11 | 11 | 12 | 12 | 12 | 12 | 12 | 14 | |
| Feels °C (?) | 8 | 9 | 10 | 11 | 8 | 9 | 6 | 5 | 1 | -1 | 4 | 4 | 3 | 2 | 2 | 4 | 5 | 7 | 8 | 9 | 11 | |
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
Recent Eyeball Surf Reports for SA - East Coast
Continuing clean conditions at Cape Northumberland (calm at Dartmoor (Australia) 54 km from Cape Northumberland). 2.0m 13s groundswell from the SW with a 0.9m 6s windswell from the WSW. 2 swells combining to make bigger set waves.
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 Cape Northumberland 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 Cape Northumberland Surf forecast
The above surf forecast table for Cape Northumberland provides essential information for determining whether the surfing conditions will be good over the next 12 days. A general guide to surfing at Cape Northumberland can be found by selecting the local surf guide option on the grey menu. Our Cape Northumberland 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 (Cape Northumberland) 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 Cape Northumberland 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.
Cape Northumberland is 6 km (4 miles) from Allendale East. If you plan a holiday in South Australia - East Coast, look for hotels and other accommodation in Allendale East. Allendale East has rooms for a wide range of budgets as well as car hire and transport links.
Nearest