Surf Forecasts:
Diamond Street surf forecast from 10 Sep 2026:
- Best quality surf: Sunday 13 Sep, 2AM (local time) - 2ft (0.6m), 14s period, SW swell with glassy winds.
- Most powerful swell: Thursday 10 Sep, 2PM (local time) - 3.5ft (1.0m), 16s period, SW swell with 498 kJ wave energy.
- Next surfable swell (1★+): Sunday 13 Sep, 2AM (local time) - 2ft (0.6m), 14s 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 Sunday (Sep 13) at 2AM. The primary swell is predicted to be 0.6m and 14s period with a secondary swell of 0.9m and 6s. 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 1.0m 16s and forecast to arrive on Thursday (Sep 10) at 2PM. 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+) | 2AM (Sun 13th Sep) | 2ft (0.6m) 14s |
| Best Surf | 2AM (Sun 13th Sep) | 2ft (0.6m) 14s |
| Most Powerful | 2PM (Thu 10th Sep) | 3.5ft (1.0m) 16s |
Table - best surf conditions forecast for Diamond Street over the next 16 days.
The Lowdown
Alright, listen up. Rusty here, and I'm looking at Diamond Street with a heavy heart. We've got a 16-day stretch that's more about wishin' than fishin'. There's swell, sure, but the wind is almost always a cross-onshore mess, chopping everything up. For the first few days, you're looking at a 3ft swell from the SW, with a 15 km/h cross-onshore breeze. It's a recipe for a frustrating session. The water is a touch warmer than normal, sitting at about 72°, so at least you won't be too cold while you're waiting for a clean one.
Honestly, there's nothing to shout about in the first week. The energy is moderate, with the combined swell energy around the 500 (507) mark on Thursday, but it's all washed out. The swell is a long-period groundswell at 16 seconds, which would normally mean some nice, organized lines, but the wind is a killer. The best we see is a glimmer around the 15th of September, when the swell drops to about 2ft, but the wind goes light and the forecast mentions a "marginal" chance. It's a tiny window.
Then we hit a dry spell. The 16th and 17th are a write-off. By the 21st of September, things finally turn. We get a clean offshore wind from the WSW and W, light at 10 km/h. The swell is still small, about 3ft, coming from the SW with a long period of 17 seconds, but the key is the clean surface. The combined swell energy is strong, hitting 582, which shows there's some real punch in the water. This is the best of the whole run. It's not a pumping day, but it's a small, clean wave with some power. Expect long waits between sets with that period, but it'll be easier to paddle out. This is the one to mark on your calendar.
After that, it's back to the grind. The wind swings cross-onshore again, and the quality drops off a cliff. The last few days of the month are just a reminder that the ocean is in a funk. For a beginner-friendly spot like Diamond Street, it's a tough go, but it's not unusual for the area. Don't lose hope, the forecasts can change, but for now, keep your board in the car and your expectations low.
Rusty.
Short Range ForecastMostly dry. Warm (max 25°C on Thu morning, min 20°C on Sat morning). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 21°C on Sun morning, min 19°C on Mon night). Wind will be generally light. | ||||||||||||||||||||
Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | |||||||||||||||
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 16 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 14 | SW 14 | SW 14 | SW 13 | W 8 | W 9 | SW 18 | W 10 | SW 17 | SW 16 | SSW 20 | SW 16 | SW 17 | SW 16 | SW 16 |
Wave Graph  | |||||||||||||||||||||
 kJ | 443 | 416 | 411 | 395 | 365 | 301 | 248 | 200 | 158 | 134 | 138 | 207 | 173 | 183 | 147 | 161 | 149 | 121 | 358 | 254 | 306 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross | cross-on | cross-on | cross-on | on | on | glassy | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | on | glassy | on | on | cross |
High Tide | 9:33AM1.66m | 9:23PM1.92m | 10:01AM1.74m | 10:04PM1.78m | 10:29AM1.78m | 10:45PM1.60m | 10:56AM1.77m | 11:27PM1.40m | 11:24AM1.73m | 00:14AM1.20m | 11:53AM1.66m | 1:14AM1.02m | 12:24PM1.56m | 3:12AM0.90m | |||||||
Low Tide | 3:37PM0.23m | 4:06AM-0.08m | 4:19PM0.15m | 4:35AM0.06m | 5:01PM0.12m | 5:01AM0.24m | 5:43PM0.15m | 5:24AM0.43m | 6:28PM0.21m | 5:45AM0.61m | 7:21PM0.29m | 5:56AM0.77m | 8:32PM0.38m | ||||||||
 | |  | | | | | |  | | | | | | | | | | | | | |
 | 6:28 | — | — | 6:28 | — | — | 6:30 | — | — | 6:31 | — | — | 6:31 | — | — | 6:31 | — | — | 6:33 | — | — |
 | — | 7:01 | — | — | 7:00 | — | — | 6:59 | — | — | 6:58 | — | — | 6:57 | — | — | 6:54 | — | — | 6:53 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 25 | 24 | 23 | 22 | 23 | 23 | 21 | 21 | 20 | 21 | 21 | 20 | 20 | 21 | 20 | 20 | 21 | 20 | 21 | 21 | 20 |
Feels °C | 26 | 24 | 24 | 22 | 22 | 25 | 21 | 20 | 20 | 20 | 20 | 21 | 20 | 20 | 20 | 20 | 21 | 21 | 21 | 21 | 20 |
Swell 1 Height (m) Direction Period (s) | SW 16 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | W 6 | W 6 | W 6 | W 7 | W 8 | W 9 | W 8 | W 10 | W 9 | W 9 | W 9 | W 8 | SW 17 | SW 16 | SW 16 |
| kJ | 443 | 416 | 411 | 395 | 365 | 301 | 49 | 47 | 68 | 134 | 138 | 207 | 173 | 183 | 102 | 103 | 74 | 48 | 358 | 254 | 306 |
Swell 2 Height (m) Direction Period (s) | SSW 12 | W 6 | W 6 | W 6 | W 7 | W 6 | SW 14 | SW 14 | SW 14 | SW 13 | SW 13 | SW 13 | SW 18 | SW 18 | SW 17 | SW 16 | SW 16 | SW 16 | W 6 | W 6 | W 6 |
| kJ | 56 | 15 | 16 | 41 | 56 | 47 | 248 | 200 | 158 | 113 | 109 | 61 | 150 | 150 | 147 | 161 | 121 | 121 | 21 | 18 | 10 |
Swell 3 Height (m) Direction Period (s) | W 5 | SSW 12 | SSW 11 | SSW 10 | SW 6 | SSW 9 | S 10 | S 9 | S 9 | S 8 | SW 16 | SW 19 | SW 13 | SW 12 | SW 12 | SW 12 | SSW 20 | SW 18 | S 9 | S 9 | S 9 |
| kJ | 8 | 54 | 22 | 20 | 6 | 17 | 28 | 27 | 13 | 13 | 67 | 177 | 60 | 55 | 38 | 23 | 149 | 83 | 14 | 15 | 14 |
Wind waves Height (m) Direction Period (s) | — | — | — | SW 6 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | 7 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 62 | 6 | 6 | 62 | 6 | 8 | 15 | 15 | 0 | 130 | 299 | 6 | 6 | 153 | 6 | 130 | 15 | 0 | 15 | 15 | 8 |
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