Surf Forecasts:
Diamond Street surf forecast from 23 Aug 2026:
- Best quality surf: Wednesday 26 Aug, 2AM (local time) - 4ft (1.2m), 13s period, S swell with glassy winds.
- Most powerful swell: Saturday 29 Aug, 5AM (local time) - 3.5ft (1.1m), 17s period, SW swell with 772 kJ wave energy.
- Next surfable swell (1★+): Monday 24 Aug, 8AM (local time) - 2ft (0.6m), 18s period with SW 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 Monday (Aug 24) at 8AM. The primary swell is predicted to be 0.6m and 18s period with a secondary swell of 0.7m and 14s. 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 5AM. 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+) | 8AM (Mon 24th Aug) | 2ft (0.6m) 18s |
| Best Surf | 2AM (Wed 26th Aug) | 4ft (1.2m) 13s |
| Most Powerful | 5AM (Sat 29th Aug) | 3.5ft (1.1m) 17s |
Table - best surf conditions forecast for Diamond Street over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s break down what Diamond Street has in store over the next couple of weeks.
First thing you need to know: the start of this run is a bit of a dud. From Saturday the 22nd of August through the end of that week, the surf is poor. Swell is tiny, around 2ft to 2ft, with a persistent cross-onshore breeze from the WNW making it choppy and messy. The combined wave energy is weak, in the low to mid hundreds, and the water is a touch warmer than normal at 70°F.
We see a little flicker of life on Monday the 24th afternoon, but it’s still marginal with a tiny swell and light cross-onshore wind. Not worth getting excited about.
The first real standout comes on Tuesday the 25th of August in the afternoon. Swell bumps up to 3ft from the SSW, with a short period of 13 seconds, but the combined energy jumps to a moderate 531. The wind is a light breeze, so it’s not too choppy. It’s a beginner-friendly size, but still just a marginal session. Crowds are listed as "sometimes," so you might see a few others.
The absolute best window of the whole 16 days, and the only time I’d really recommend paddling out, is from Tuesday the 1st of September afternoon through Wednesday the 2nd of September. On Tuesday afternoon, we’ve got a SSW swell of 5ft with a period of 14 seconds and a combined energy of 869 (strong). The wind is light cross-onshore, which is manageable. This is the biggest, most energetic surf of the entire forecast. Wednesday morning holds 4ft from the SSW with a period of 12 seconds and energy at 587, still with light cross-onshore winds. This is your window.
After that, the swell drops back to the 2ft-4ft range for the rest of the run into September, with light winds but mostly cross-onshore or onshore. It’s mostly marginal, with combined energy in the moderate range. Nothing else is a must-surf.
So here’s the takeaway: the first week is a washout. The second week’s highlight is Tuesday 1st and Wednesday 2nd of September. That’s your time to go. After that, it’s back to small, marginal conditions.
Rusty out.
Short Range ForecastMostly dry. Warm (max 26°C on Tue morning, min 22°C on Sat night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 25°C on Tue afternoon, min 21°C on Wed night). Wind will be generally light. | |||||||||||||||||||
Sat 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | ||||||||||||||
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 15 | SW 15 | SW 19 | SSW 13 | SSW 14 | WSW 18 | SW 17 | SW 17 | SW 16 | SSW 13 | S 13 | S 12 | S 12 | S 11 | S 10 | SSW 10 | SW 18 | SW 16 | SW 16 | SW 17 |
Wave Graph  | ||||||||||||||||||||
 kJ | 217 | 220 | 171 | 154 | 233 | 209 | 135 | 222 | 214 | 295 | 498 | 530 | 411 | 358 | 250 | 154 | 246 | 216 | 165 | 663 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross-on | cross | on | cross-on | cross-on | cross-on | cross-on | glassy | cross-on | cross-on | cross | cross-on | on | glassy | cross-on | cross-on | glassy |
High Tide | 6:17PM1.56m | 8:41AM1.17m | 7:04PM1.67m | 8:55AM1.23m | 7:42PM1.77m | 9:11AM1.29m | 8:17PM1.85m | 9:29AM1.36m | 8:49PM1.89m | 9:50AM1.44m | 9:21PM1.87m | 10:13AM1.52m | 9:54PM1.81m | |||||||
Low Tide | 2:09AM0.09m | 1:18PM0.87m | 2:39AM0.01m | 1:55PM0.76m | 3:05AM-0.05m | 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 | |||||||
 |  |  | | | | | | | | | | | | | | | | | | |
 | — | — | 6:16 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:20 | — | — | 6:20 | — | — |
 | 7:25 | — | — | 7:24 | — | — | 7:23 | — | — | 7:22 | — | — | 7:21 | — | — | 7:20 | — | — | 7:19 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 23 | 23 | 25 | 25 | 24 | 25 | 24 | 23 | 26 | 25 | 25 | 23 | 23 | 22 | 23 | 24 | 23 | 25 | 25 | 24 |
Feels °C | 24 | 25 | 26 | 25 | 26 | 26 | 24 | 24 | 27 | 25 | 26 | 23 | 22 | 24 | 23 | 25 | 25 | 25 | 25 | 25 |
Swell 1 Height (m) Direction Period (s) | SW 15 | SW 15 | W 7 | SSW 13 | SSW 14 | WSW 18 | SSW 13 | SW 17 | SSW 13 | SSW 13 | S 13 | S 12 | S 12 | S 11 | S 10 | SSW 10 | S 9 | S 9 | S 8 | SW 17 |
| kJ | 217 | 220 | 43 | 154 | 233 | 209 | 111 | 222 | 178 | 295 | 498 | 530 | 411 | 358 | 250 | 154 | 106 | 99 | 71 | 663 |
Swell 2 Height (m) Direction Period (s) | W 6 | WNW 6 | SSW 13 | W 6 | W 5 | W 6 | W 6 | SSW 13 | SW 16 | SW 16 | W 6 | WNW 7 | W 7 | SW 15 | W 7 | W 8 | SW 18 | SW 16 | WNW 8 | S 8 |
| kJ | 20 | 12 | 114 | 29 | 19 | 18 | 17 | 156 | 214 | 208 | 36 | 67 | 49 | 134 | 39 | 48 | 246 | 216 | 51 | 51 |
Swell 3 Height (m) Direction Period (s) | WSW 19 | SW 19 | SW 19 | SW 18 | SW 18 | SSW 14 | SW 17 | W 6 | W 6 | W 6 | SW 16 | SW 16 | SW 16 | W 7 | SW 14 | SW 14 | SW 13 | WNW 9 | SW 16 | W 8 |
| kJ | 35 | 94 | 171 | 154 | 155 | 120 | 135 | 15 | 17 | 28 | 203 | 203 | 196 | 24 | 103 | 102 | 88 | 59 | 165 | 33 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 14 | 14 | 14 | 14 | 7 | 15 | 270 | 4 | 14 | 14 | 0 | 130 | 8 | 6 | 8 | 15 | 0 | 130 | 14 | 0 |
Best forecast wave conditions in San Diego County | ||||||||||||||||||||
Best forecast wave conditions in United States | ||||||||||||||||||||
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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.
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