Surf Forecasts:
Diamond Street surf forecast from 20 Jul 2026:
- Best quality surf: Saturday 25 Jul, 5AM (local time) - 3.5ft (1.0m), 21s period, SW swell with glassy winds.
- Most powerful swell: Monday 27 Jul, 11AM (local time) - 4.5ft (1.3m), 18s period, SW swell with 1,124 kJ wave energy.
- Next surfable swell (1★+): Tuesday 21 Jul, 5AM (local time) - 3.5ft (1.0m), 16s 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 Tuesday (Jul 21) at 5AM. The primary swell is predicted to be 1.0m and 16s period with a secondary swell of 0.7m and 9s. 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 1.3m 18s and forecast to arrive on Monday (Jul 27) at 11AM. 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 (Tue 21st Jul) | 3.5ft (1.0m) 16s |
| Best Surf | 5AM (Sat 25th Jul) | 3.5ft (1.0m) 21s |
| Most Powerful | 11AM (Mon 27th Jul) | 4.5ft (1.3m) 18s |
Table - best surf conditions forecast for Diamond Street over the next 16 days.
The Lowdown
Alright, this is Rusty, and we’re looking at the next couple of weeks at Diamond Street. Let’s get into it.
Honestly, it’s a pretty grim stretch for Diamond Street. The water is sitting at 73° – that’s much warmer than normal for this time of year, which is a weird one, but it’s about the only thing that’s out of the ordinary. The real issue is that the surf just never gets its act together. The conditions are all over the place, and the scores are low across the board.
It kicks off Monday the 20th with a clean little 3ft swell from the southwest, but it’s a long period, 15 seconds. There’s some light offshore wind early, but the forecast flags it as marginal. The combined energy is weak (546), so it’s not really doing much. Tuesday the 21st sees a little bump to 4ft from the same direction, but by the afternoon the wind turns cross-onshore and it’s choppy. Wednesday and Thursday are much the same story – waist-high stuff, cross-onshore winds, and the energy is still moderate at best. There’s a bit of a push on Friday the 24th morning, swell up to 4ft from the SSW, with a moderate energy reading (1175) and light offshore wind, but it still gets a marginal call. It’s the best the whole week has, but that’s not saying much.
The weekend of the 26th and 27th is frustrating. Some very long period groundswell (19 seconds) rolls in, but the swell is small and the wind is either cross-on or just light. That long period stuff at a beach break like Diamond Street can be a bit wonky, and it never really lines up. The energy readings are moderate, but the quality isn’t there.
We head into the last week of July and into August, and it’s the same pattern. Small swells, cross-onshore winds, and persistent poor or marginal conditions. There’s a hint of something on Friday the 31st where the swell gets to 5ft from the SSW, but the wind is cross-on and it’s rated as poor. By the first week of August, the swell drops off and the energy is weak. The morning of August 4th shows a 4ft swell from the south with a 16-second period and moderate energy (926), but again, the wind is cross-on and it’s only marginal. There is no standout window in this entire 16-day outlook. It’s just a long, flat, choppy run.
Rusty.
Short Range ForecastMostly dry. Warm (max 23°C on Tue morning, min 21°C on Mon morning). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 23°C on Sat night, min 20°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | Saturday 25 | Sunday 26 | |||||||||||||||
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) | SW 15 | SW 16 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 14 | SSW 14 | SSW 13 | SSW 13 | SSW 13 | SSW 13 | SSW 13 | SW 21 | SW 21 | SW 21 | SW 19 | SW 19 | SW 18 | SW 18 |
Wave Graph  | |||||||||||||||||||||
 kJ | 284 | 306 | 492 | 532 | 375 | 492 | 418 | 407 | 704 | 586 | 569 | 633 | 560 | 491 | 647 | 548 | 420 | 834 | 723 | 609 | 602 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | on | on | cross-on | cross-on | on | cross-on | cross-on | cross-on | cross-on | cross-on | on | on | on | cross-on | cross-on | on | on | on | cross-on |
High Tide | 3:01PM1.51m | 3:26AM0.96m | 3:54PM1.53m | 5:38AM0.87m | 4:51PM1.55m | 7:42AM0.93m | 5:47PM1.60m | 8:38AM1.01m | 6:37PM1.66m | 9:08AM1.08m | 7:21PM1.73m | 9:30AM1.13m | 7:59PM1.80m | ||||||||
Low Tide | 8:25AM0.38m | 10:14PM0.52m | 9:05AM0.58m | 11:50PM0.41m | 9:57AM0.75m | 1:04AM0.27m | 11:10AM0.85m | 1:56AM0.13m | 12:24PM0.88m | 2:35AM0.03m | 1:20PM0.86m | 3:08AM-0.05m | 2:03PM0.80m | 3:38AM-0.11m | |||||||
 | |  | | | | | | | | | | | | | |  | | | | | |
 | 5:54 | — | — | 5:54 | — | — | 5:54 | — | — | 5:56 | — | — | 5:56 | — | — | 5:56 | — | — | 5:58 | — | — |
 | — | 7:54 | — | — | 7:54 | — | — | 7:53 | — | — | 7:53 | — | — | 7:52 | — | — | 7:52 | — | — | 7:52 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 22 | 22 | 21 | 23 | 23 | 22 | 22 | 23 | 22 | 22 | 22 | 22 | 22 | 22 | 21 | 22 | 22 | 23 | 23 | 23 | 22 |
Feels °C | 22 | 21 | 22 | 22 | 21 | 22 | 22 | 22 | 22 | 22 | 21 | 23 | 22 | 22 | 22 | 22 | 22 | 22 | 24 | 23 | 24 |
Swell 1 Height (m) Direction Period (s) | SSW 11 | SSW 11 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 14 | SSW 14 | SSW 13 | SSW 13 | SSW 13 | SSW 13 | SSW 13 | SSW 12 | SSW 12 | SW 12 | SW 19 | SW 19 | SW 18 | SW 18 |
| kJ | 254 | 206 | 492 | 532 | 375 | 492 | 418 | 407 | 704 | 586 | 569 | 633 | 560 | 491 | 365 | 299 | 330 | 834 | 723 | 609 | 602 |
Swell 2 Height (m) Direction Period (s) | SW 15 | SW 16 | SSW 10 | SSW 9 | SSW 9 | SSW 8 | S 15 | S 14 | WNW 6 | WNW 7 | SW 26 | W 6 | W 7 | W 7 | SW 21 | W 7 | W 7 | SSW 12 | SW 11 | W 7 | W 7 |
| kJ | 284 | 306 | 98 | 62 | 80 | 38 | 67 | 181 | 33 | 58 | 105 | 57 | 74 | 56 | 647 | 64 | 61 | 235 | 172 | 59 | 52 |
Swell 3 Height (m) Direction Period (s) | WNW 5 | WNW 5 | WNW 14 | WNW 5 | SW 11 | WNW 4 | SW 8 | SW 7 | SW 7 | SW 6 | SW 18 | SW 18 | SW 24 | SW 24 | W 6 | SW 21 | SW 21 | W 7 | W 7 | SW 11 | SW 11 |
| kJ | 8 | 9 | 40 | 5 | 45 | 6 | 30 | 19 | 16 | 10 | 80 | 80 | 541 | 271 | 36 | 548 | 420 | 44 | 61 | 121 | 90 |
Wind waves Height (m) Direction Period (s) | — | — | WNW 5 | — | WNW 5 | — | — | W 6 | — | — | W 6 | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | 5 | — | 5 | — | — | 15 | — | — | 35 | — | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 15 | 15 | 4 | 15 | 15 | 14 | 15 | 15 | 14 | 14 | 15 | 14 | 15 | 15 | 15 | 130 | 6 | 15 | 15 | 15 | 6 |
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)
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 Diamond Street 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 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.
Nearest