Surf Forecasts:
Diamond Street surf forecast from 26 Aug 2026:
- Best quality surf: Wednesday 26 Aug, 5AM (local time) - 4.5ft (1.3m), 13s period, S swell with glassy winds.
- Most powerful swell: Saturday 29 Aug, 2AM (local time) - 3.5ft (1.1m), 17s period, SW swell with 763 kJ wave energy.
- Next surfable swell (1★+): Wednesday 26 Aug, 5AM (local time) - 4.5ft (1.3m), 13s period with S swell.
Best Forecast Surf Conditions for Diamond Street this week:
The surf forecast for Diamond Street over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Aug 26) at 5AM. The primary swell is predicted to be 1.3m and 13s period with a secondary swell of 0.6m and 16s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Diamond Street in the next 16 days are 1.1m 17s and forecast to arrive on Saturday (Aug 29) at 2AM. Winds are predicted to be cross-onshore at the time the swell arrives.
| Wave Type | Time (PDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Wed 26th Aug) | 4.5ft (1.3m) 13s |
| Best Surf | 5AM (Wed 26th Aug) | 4.5ft (1.3m) 13s |
| Most Powerful | 2AM (Sat 29th Aug) | 3.5ft (1.1m) 17s |
Table - best surf conditions forecast for Diamond Street over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s see what we got for Diamond Street.
This is a tricky run. The whole 16-day window is a bit of a mixed bag with no real stunners. Most of the time the wind is light, but it's coming from the wrong direction for this break, leaving the waves messy and cross-onshore. The surf is gonna be small to tiny for the majority of the period, with the odd bump in size that gets spoiled by the conditions. We are looking at a lot of days where the quality is just not there.
The water temperature sits at 73°, which is a solid 4° warmer than normal for this time of year—the water’s real warm, you won't be needing the thick rubber.
Alright, let's get into the details. The run starts Tuesday the 25th of August, and honestly, it's not great. Tuesday morning has a 2ft south-west swell with a very long 16-second period, but with a cross-onshore wind, it’s gonna be all chopped up. The combined energy is moderate at 407. Move to Wednesday the 26th, and the swell picks up a bit to 4ft on Wednesday morning from the SSW, period 12-seconds (moderate energy at 718), but again, that cross-onshore wind is gonna make it a grovel.
Things are looking a bit better on Friday the 28th of August. Friday morning we finally get a glassy window with clean conditions. The swell is tiny, 2ft from the SW with a very long 16-second period, and the energy is moderate at 360. It won't be big, but it'll be the most fun you’ll have this week. Friday afternoon the wind swings back around and messes it up.
Through the weekend and into next week, it’s more of the same. Saturday the 29th has a bit more size, 4ft from the SW with a 16-second period and moderate energy around 713-753, but it's cross-onshore again. It stays light the whole weekend, but the direction is just not right for Diamond Street to be clean.
There’s a small bump in size on Thursday the 3rd of September—the afternoon shows a 5ft SW swell with a 15-second period and the combined energy hits a strong 1108. But again, the wind is cross-onshore at 9 mph, so the quality will be lacking. That trend of light breeze and wrong direction continues into the second week, with waves staying small, around 2ft to 3ft, and the wind never really cleaning up. It's a long stretch of poor surf. Friday the 4th of September has a nice 3ft swell at a very long 17-second period, but it's blown out.
The Pick – If you’re gonna paddle out, Friday, August 28th morning is your best bet. It’s glassy, there’s a long-range groundswell rolling in at 2ft from the SW, and the energy is decent. It’s clean, but keep your expectations in check because it’s small.
There’s nothing else that stands out. The whole second week looks bleak with very poor conditions. This is one where you check the buoys and keep your fingers crossed for a change in the wind forecast.
– Rusty
Short Range ForecastMostly dry. Warm (max 26°C on Fri morning, min 22°C on Wed night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 26°C on Fri afternoon, min 21°C on Sun night). Wind will be generally light. | |||||||||||||||||||
Tue 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | ||||||||||||||
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) | SSW 13 | S 13 | SSW 12 | S 12 | S 10 | SSW 12 | SW 14 | SW 18 | SW 16 | SW 16 | SW 17 | SW 16 | SW 16 | SW 16 | SW 15 | SW 14 | SW 14 | SW 14 | S 12 | SSW 13 |
Wave Graph | ||||||||||||||||||||
286 | 591 | 494 | 390 | 255 | 196 | 130 | 192 | 169 | 165 | 763 | 589 | 653 | 612 | 424 | 412 | 346 | 288 | 187 | 219 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross-on | on | cross-on | cross-on | cross-on | glassy | on | cross-on | cross-on | on | on | on | on | cross-on | on | on | cross-on | cross |
High Tide | 8:17PM1.85m | 9:29AM1.36m | 8:49PM1.89m | 9:50AM1.44m | 9:21PM1.87m | 10:13AM1.52m | 9:54PM1.81m | 10:38AM1.60m | 10:30PM1.69m | 11:04AM1.66m | 11:09PM1.52m | 11:33AM1.71m | 11:54PM1.32m | |||||||
Low Tide | 2:28PM0.65m | 3:31AM-0.09m | 3:01PM0.55m | 3:55AM-0.10m | 3:34PM0.45m | 4:19AM-0.07m | 4:09PM0.37m | 4:43AM-0.01m | 4:47PM0.31m | 5:07AM0.10m | 5:29PM0.28m | 5:31AM0.24m | 6:17PM0.27m | |||||||
— | — | 6:18 | — | — | 6:20 | — | — | 6:20 | — | — | 6:20 | — | — | 6:22 | — | — | 6:22 | — | — | |
7:22 | — | — | 7:21 | — | — | 7:20 | — | — | 7:19 | — | — | 7:17 | — | — | 7:15 | — | — | 7:15 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 24 | 23 | 24 | 24 | 24 | 25 | 25 | 24 | 26 | 26 | 25 | 25 | 24 | 23 | 23 | 23 | 22 | 22 | 22 | 21 |
Feels °C | 26 | 25 | 25 | 24 | 26 | 26 | 25 | 26 | 27 | 27 | 27 | 26 | 25 | 25 | 23 | 22 | 23 | 22 | 21 | 21 |
Swell 1 Height (m) Direction Period (s) | SSW 13 | S 13 | SSW 12 | S 12 | S 10 | SSW 12 | S 10 | SSW 10 | S 9 | WNW 8 | SW 17 | SW 16 | SW 16 | SW 16 | W 8 | W 8 | WNW 7 | SW 14 | S 12 | SSW 13 |
286 | 591 | 494 | 390 | 255 | 196 | 117 | 150 | 78 | 70 | 763 | 589 | 653 | 612 | 142 | 115 | 82 | 288 | 187 | 219 | |
Swell 2 Height (m) Direction Period (s) | SW 16 | SW 16 | SW 16 | SW 16 | SW 15 | S 9 | SSW 11 | SW 14 | SW 16 | S 8 | W 8 | W 7 | WNW 7 | W 8 | SW 15 | SW 14 | SW 14 | WNW 7 | WNW 7 | W 6 |
208 | 203 | 203 | 193 | 171 | 81 | 109 | 151 | 169 | 51 | 43 | 109 | 91 | 138 | 424 | 412 | 346 | 65 | 62 | 41 | |
Swell 3 Height (m) Direction Period (s) | WNW 6 | WNW 6 | W 6 | W 15 | W 6 | SW 15 | SW 14 | SW 18 | SW 13 | SW 16 | S 8 | SSW 8 | SSW 8 | S 8 | S 13 | S 12 | S 14 | S 12 | SW 13 | S 11 |
11 | 12 | 21 | 17 | 13 | 104 | 130 | 192 | 113 | 165 | 33 | 20 | 12 | 4 | 30 | 26 | 191 | 143 | 144 | 82 | |
Wind waves Height (m) Direction Period (s) | — | — | — | W 6 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
— | — | — | 20 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 15 | 15 | 6 | 130 | 7 | 154 | 6 | 0 | 15 | 15 | 8 | 15 | 15 | 15 | 15 | 195 | 15 | 15 | 14 | 13 |
Best forecast wave conditions in San Diego County | ||||||||||||||||||||
Best forecast wave conditions in United States | ||||||||||||||||||||
Header Global | ||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)
Wind Speed (km/h)
Information about the Diamond Street Surf forecast
The above surf forecast table for Diamond Street provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Diamond Street can be found by selecting the local surf guide option on the grey menu. Our Diamond Street 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 Street) 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 Street 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 Street is 9 km (6 miles) from San Diego. If you plan a vacation in San Diego County, look for hotels and other accommodation in San Diego. San Diego has rooms for a wide range of budgets as well as car hire and transport links.











