Surf Forecasts:
Diamond Beach surf forecast from 20 Aug 2026:
- Most powerful swell: Friday 21 Aug, 11AM (local time) - 3ft (0.9m), 5s period, NE swell with 42 kJ wave energy.
Best Forecast Surf Conditions for Diamond Beach this week:
The most powerful waves expected at Diamond Beach in the next 16 days are 0.9m 5s and forecast to arrive on Friday (Aug 21) at 11AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 4s period and expected on Friday (Aug 21) at 8AM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 11AM (Fri 21st Aug) | 3ft (0.9m) 5s |
Table - best surf conditions forecast for Diamond Beach over the next 16 days.
The Lowdown
Alright, let me tell you about Diamond Beach. It’s an exposed beach setup, and honestly, it’s looking pretty flat and quiet for a long stretch here. The swell is tiny and the wind is often messy.
We start off on Thursday the 20th of August, and right through until the Monday the 25th, there’s just nothing doing. The waves are small and weak, with the combined swell energy sitting mostly between 8 and 36. The wind is cross-shore or onshore most of that time, creating ripples and chop. There’s a moment on Monday the 24th with a clean offshore from the NW, but with the swell only about 1ft, it’s not breaking.
Tuesday the 26th of August is more of the same – small and choppy. Wednesday the 27th picks up a little, but it’s still onshore and messy. The morning of Friday the 28th gets glassy, with a tiny 2ft of swell from the ESE, but the energy is weak at 39. Nice to look at, but not really rideable.
After that, we hit another quiet gap. The wind and swell just aren't coming together. It isn’t until the morning of Tuesday the 1st of September that we see something worth paddling for. The swell is still small at about 1ft, but the period stretches out to a long 11 seconds from the SE. The wind goes cross-off from the WNW, and the water is dead clean. The combined energy climbs to a moderate 87. It’s not big, but for a beginner spot that’s been asleep for over a week, that clean, long-period groundswell might just give you a few fun little walls. It’s not a standout for the experts, but for a quiet learner’s session, it’s the only real offering on the whole chart.
After that, the wind goes nasty again. Wednesday the 2nd and Thursday the 3rd of September see strong onshore blows and lumpy, messy surf. The swell energy spikes hard into moderate-to-strong territory (264) on the Wednesday afternoon, but with that strong cross-shore wind and a period of 11 seconds, it’s going to be a crumbly, blown-out mess at a beach break. Honestly, this setup looks more interesting for kite surfing than paddle surfing.
So, the long and short of it: you’re looking at a long flat spell, with one glimmer of light on the 1st of September morning. That Tuesday morning is your best bet for a clean, tiny wave. The rest is either flat or too choppy to bother with.
Rusty.
Short Range ForecastHeavy rain (total 51mm), heaviest during Thu night. Warm (max 28°C on Wed night, min 20°C on Thu night). Winds increasing (calm on Thu morning, fresh winds from the NE by Thu night). | Days 5-7 Weather SummaryHeavy rain (total 27mm), heaviest during Sun night. Warm (max 27°C on Sun afternoon, min 20°C on Mon morning). Wind will be generally light. | ||||||||||||||||||
Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | ||||||||||||||
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) | SE 9 | ESE 8 | SE 8 | ENE 4 | NE 5 | ENE 5 | E 5 | ESE 8 | ESE 8 | SE 5 | SSE 6 | SSE 6 | SE 6 | SE 12 | SE 12 | SE 11 | ESE 11 | ESE 11 | ESE 11 |
Wave Graph  | |||||||||||||||||||
 kJ | 12 | 7 | 18 | 7 | 42 | 28 | 13 | 27 | 6 | 7 | 18 | 26 | 14 | 22 | 21 | 19 | 11 | 11 | 11 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross | on | cross-off | cross | cross | cross | cross-on | cross-on | cross | cross | cross-on | off | off | off | cross-off | cross-off | cross-off | glassy |
High Tide | 2:32AM1.15m | 3:04PM1.37m | 3:25AM1.09m | 3:56PM1.35m | 4:23AM1.07m | 4:53PM1.35m | 5:24AM1.09m | 5:49PM1.39m | 6:21AM1.14m | 6:42PM1.45m | 7:11AM1.22m | 7:27PM1.51m | |||||||
Low Tide | 8:13PM0.33m | 8:12AM0.32m | 9:17PM0.36m | 9:14AM0.37m | 10:19PM0.35m | 10:15AM0.37m | 11:13PM0.31m | 11:10AM0.33m | 00:01AM0.25m | 12:00PM0.28m | 00:46AM0.18m | 12:47PM0.22m | 1:29AM0.11m | ||||||
 |  |  |  |  |  | |  |  | | | |  | | | | | |  | |
 | — | 6:16 | — | — | 6:16 | — | — | 6:18 | — | — | 6:18 | — | — | 6:20 | — | — | 6:20 | — | — |
 | 7:49 | — | 7:47 | — | — | 7:45 | — | — | 7:45 | — | — | 7:43 | — | — | 7:42 | — | — | 7:39 | — |
mm | — | — | 3 | 31 | — | — | 5 | 9 | 3 | 6 | — | 5 | 16 | — | — | — | — | — | — |
Temp °C | 28 | 26 | 27 | 23 | 23 | 23 | 25 | 22 | 23 | 25 | 24 | 27 | 22 | 22 | 24 | 24 | 21 | 24 | 24 |
Feels °C | 28 | 28 | 27 | 24 | 22 | 22 | 29 | 24 | 26 | 28 | 26 | 27 | 20 | 19 | 20 | 23 | 21 | 23 | 24 |
Swell 1 Height (m) Direction Period (s) | SE 9 | ESE 8 | SE 8 | ENE 4 | SSE 5 | ESE 9 | ESE 9 | ENE 5 | SE 5 | SE 5 | SSE 6 | E 7 | SSE 4 | SSE 6 | SSE 6 | SSE 6 | SSE 6 | SSE 6 | ESE 11 |
| kJ | 12 | 7 | 18 | 7 | 5 | 8 | 7 | 2 | 3 | 6 | 18 | 4 | 5 | 13 | 14 | 7 | 7 | 7 | 11 |
Swell 2 Height (m) Direction Period (s) | — | SE 5 | — | SE 4 | ESE 8 | S 5 | SSE 4 | SE 14 | ENE 5 | ESE 8 | E 8 | SE 12 | SE 6 | SE 12 | SE 12 | SE 11 | ESE 11 | ESE 11 | SSE 6 |
| kJ | — | 1 | — | 5 | 7 | 2 | 2 | 7 | 2 | 6 | 4 | 6 | 9 | 22 | 21 | 19 | 11 | 11 | 3 |
Swell 3 Height (m) Direction Period (s) | — | — | — | S 4 | E 15 | E 15 | SE 14 | ESE 13 | ESE 8 | SE 13 | SE 12 | SE 8 | ESE 12 | E 7 | E 7 | E 7 | E 7 | E 7 | E 6 |
| kJ | — | — | — | 1 | 4 | 4 | 8 | 18 | 6 | 7 | 6 | 3 | 14 | 1 | 1 | 1 | 1 | 1 | 1 |
Wind waves Height (m) Direction Period (s) | — | — | SSE 3 | N 2 | NE 5 | ENE 5 | E 5 | ESE 8 | — | — | — | SSE 6 | W 3 | NW 3 | WNW 3 | WNW 2 | — | — | — |
| kJ | — | — | 12 | 1 | 42 | 28 | 13 | 27 | — | — | — | 26 | 1 | 1 | 4 | 1 | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 144 | 210 | 548 | 74 | 1001 | 419 | 548 | 10 | 260 | 223 | 42 | 117 | 30 | 32 | 32 | 98 | 85 | 548 | 98 |
Best forecast wave conditions in New Jersey | |||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||
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Information about the Diamond Beach Surf forecast
The above surf forecast table for Diamond Beach provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Diamond Beach can be found by selecting the local surf guide option on the grey menu. Our Diamond Beach 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 (Diamond Beach) 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 Diamond Beach 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.
Diamond Beach is 43 km (27 miles) from Ocean City. If you plan a vacation in New Jersey, look for hotels and other accommodation in Ocean City. Ocean City has rooms for a wide range of budgets as well as car hire and transport links.
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