Surf Forecasts:
Diamond Beach surf forecast from 18 Aug 2026:
- Most powerful swell: Wednesday 19 Aug, 2AM (local time) - 1.5ft (0.5m), 11s period, SE swell with 56 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 0.5m 11s and forecast to arrive on Wednesday (Aug 19) at 2AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 3s period and expected on Friday (Aug 21) at 5AM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 2AM (Wed 19th Aug) | 1.5ft (0.5m) 11s |
Table - best surf conditions forecast for Diamond Beach over the next 16 days.
The Lowdown
Alright folks, Rusty here.
Let’s be real – the first week or so is cooked. You’re looking at a long stretch of nothing, with waves barely reaching 2 feet out of the SE. The energy is in the dumps, with readings in the teen to low 90s. There’s a few flat-calm mornings (like Thursday the 20th), but there’s just no juice in the water. It’s a lake.
We finally get a hiccup of life on Sunday the 31st of August. Diamond Beach gets a bump from the E, hitting 4 feet in the morning and 4 feet by the afternoon. The energy finally wakes up to triple digits (110 then 153). The wind is offshore from the NW in the morning, then cross-offshore from the WSW in the afternoon. It’s clean, but the period is short (6 seconds), so it’s going to be a bit fat and weak. Rideable, but nothing special.
The real window is Tuesday the 1st of September. That’s the one. You’ve got a solid 5 feet of swell from the E in the morning, with the combined energy reading a strong 313. The wind is dead calm – glassy. That’s as clean as it gets. The afternoon drops to 5 feet with a cross-offshore breeze from the W, still clean. The period is only 8 seconds, so it won’t be a long-range groundswell, but for a beach break, this is your best shot. It’s a good size for an intermediate, right at the limit for a beginner.
After that, Wednesday the 2nd of September drops back to 3 feet from the ESE, and the wind gets nasty with a fresh 30 km/h cross-shore from the NE. Choppy mess.
So, to sum it up: a week of flatness, a small pulse on Sunday the 31st, and the clear winner is the glassy morning of Tuesday the 1st of September. Don’t expect much else.
Stay wet,
Rusty
Short Range ForecastModerate rain (total 10mm), heaviest on Thu afternoon. Warm (max 28°C on Wed afternoon, min 22°C on Thu night). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 42mm), heaviest during Sun night. Warm (max 28°C on Sun afternoon, min 20°C on Sun night). Wind will be generally light. | ||||||||||||||||||||
Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 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) | SE 6 | SE 7 | SE 11 | SE 10 | SE 9 | SE 9 | SE 8 | ESE 8 | ESE 8 | ENE 4 | ENE 4 | E 4 | E 5 | E 5 | ENE 6 | ESE 8 | SSE 5 | SSE 6 | SSE 6 | SE 12 | ESE 11 |
Wave Graph  | |||||||||||||||||||||
 kJ | 14 | 22 | 56 | 34 | 22 | 12 | 11 | 7 | 7 | 12 | 15 | 8 | 48 | 18 | 10 | 6 | 6 | 25 | 14 | 21 | 12 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | on | cross | cross-off | cross-on | cross-on | glassy | glassy | cross-off | cross | cross-on | cross-on | cross | cross | cross-on | cross-on | cross | cross-off | off | cross-off | cross-on |
High Tide | 1:28PM1.47m | 1:42AM1.23m | 2:16PM1.42m | 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 | ||||||||
Low Tide | 7:14PM0.26m | 7:19AM0.23m | 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 | ||||||||
 | |  | | |  |  | |  | |  |  |  | | |  | | | | | | |
 | 6:15 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:18 | — | — | 6:18 | — | — | 6:20 | — | — |
 | — | 7:50 | — | — | 7:49 | — | — | 7:47 | — | — | 7:45 | — | — | 7:45 | — | — | 7:43 | — | — | 7:42 | — |
mm | — | — | — | — | — | — | 3 | 5 | 2 | — | — | 2 | 13 | — | 3 | 5 | 1 | 18 | — | — | — |
Temp °C | 24 | 25 | 25 | 26 | 28 | 28 | 24 | 24 | 25 | 24 | 24 | 23 | 21 | 22 | 22 | 24 | 28 | 22 | 21 | 25 | 25 |
Feels °C | 27 | 28 | 28 | 27 | 29 | 29 | 26 | 27 | 28 | 21 | 22 | 22 | 20 | 22 | 22 | 27 | 30 | 23 | 19 | 24 | 23 |
Swell 1 Height (m) Direction Period (s) | SE 6 | SE 7 | SE 11 | SE 10 | SE 9 | SE 9 | SE 8 | ESE 8 | ESE 8 | SSE 5 | ESE 9 | ESE 9 | E 5 | ESE 8 | ENE 6 | ENE 5 | ENE 5 | SSE 6 | SSE 6 | SSE 6 | SSE 6 |
| kJ | 14 | 22 | 56 | 34 | 22 | 12 | 11 | 7 | 7 | 4 | 8 | 7 | 28 | 6 | 10 | 6 | 3 | 25 | 10 | 7 | 7 |
Swell 2 Height (m) Direction Period (s) | SE 13 | SE 12 | NE 4 | NE 4 | — | SE 6 | SE 5 | SSE 5 | SSE 3 | ESE 8 | SE 5 | SE 4 | ESE 8 | SE 13 | SSE 4 | S 4 | SE 12 | ESE 12 | ESE 12 | SE 12 | ESE 11 |
| kJ | 7 | 5 | 1 | 1 | — | 6 | 1 | 2 | 1 | 7 | 1 | 1 | 7 | 7 | 3 | 1 | 6 | 14 | 14 | 21 | 12 |
Swell 3 Height (m) Direction Period (s) | SE 13 | NE 4 | — | NE 4 | NE 4 | — | S 3 | E 7 | E 6 | E 15 | — | — | SE 14 | SE 10 | ESE 8 | ESE 8 | E 7 | NE 5 | E 7 | E 7 | E 7 |
| kJ | 6 | 1 | — | 1 | 1 | — | 1 | 3 | 3 | 4 | — | — | 7 | 4 | 6 | 6 | 4 | 1 | 1 | 1 | 4 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | S 3 | — | — | NE 2 | ENE 4 | ENE 4 | E 4 | E 5 | E 5 | S 4 | — | SSE 5 | W 2 | NW 3 | — | — |
| kJ | — | — | — | — | — | 5 | — | — | 1 | 12 | 15 | 8 | 48 | 18 | 9 | — | 5 | 1 | 1 | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 169 | 346 | 28 | 32 | 548 | 158 | 201 | 548 | 528 | 1001 | 289 | 502 | 64 | 325 | 205 | 119 | 502 | 7 | 32 | 42 | 62 |
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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