Surf Forecasts:
Diamond Street surf forecast from 13 Sep 2026:
- Best quality surf: Sunday 20 Sep, 2AM (local time) - 2.5ft (0.8m), 18s period, SW swell with glassy winds.
- Most powerful swell: Saturday 19 Sep, 11AM (local time) - 2.5ft (0.8m), 18s period, SW swell with 379 kJ wave energy.
- Next surfable swell (1★+): Tuesday 15 Sep, 11PM (local time) - 1.5ft (0.5m), 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 (Sep 15) at 11PM. The primary swell is predicted to be 0.5m 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 0.8m 18s and forecast to arrive on Saturday (Sep 19) 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+) | 11PM (Tue 15th Sep) | 1.5ft (0.5m) 16s |
| Best Surf | 2AM (Sun 20th Sep) | 2.5ft (0.8m) 18s |
| Most Powerful | 11AM (Sat 19th Sep) | 2.5ft (0.8m) 18s |
Table - best surf conditions forecast for Diamond Street over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's have a look at what's on the table for the next couple of weeks. It’s not the most exciting start, but we’ll get through it.
First up, Diamond Street. The outlook starts on Sunday the 13th of September with a bit of swell showing, but it's a messy start. The wind is cross-on from the SW at 9 mph, making conditions choppy and poor. Combined swell energy is weak at 179. We're looking at a 2ft swell from the SW with a period of 13 seconds, which is solid enough but the wind is just ruining it.
Monday the 14th sees a slight bump in swell to 4ft from the W, but again cross-on wind from the SSW at 9 mph keeps it poor. The period drops to 8 seconds, so it’s a short-period, choppy mess. Combined energy is moderate at 449.
Tuesday the 15th is more of the same: 2ft from the SW with a very long 16-second period, but cross-on wind from the SW at 6 mph keeps it marginal at best. Energy is 281.
Wednesday the 16th offers a small 3ft from the SW with a 17-second period, but again onshore wind from the WSW at 6 mph. No clean waves.
The first real glimmer of hope shows up on Saturday the 19th. We get a 3ft SW swell with an 18-second period. The wind is cross-on from the W at 6 mph, which is light, so the surf is described as marginal. The combined energy climbs to 549, which is moderate but heading in the right direction.
Sunday the 20th keeps the same 3ft SW swell, and the wind shifts to onshore from the SW at 6 mph. Still marginal, but the energy is 543.
Monday the 21st is the best of the first week. The swell bumps up to 3ft from the SW with a 17-second period, and the wind is onshore from the SW at 9 mph. The combined energy hits 675, which is moderate. It's still marginal, but it's the strongest swell of the period so far.
Tuesday the 22nd morning offers a 3ft SW swell with a 16-second period, and onshore wind from the SW at 6 mph. Energy is 526. It’s rated a 2/10, which is the highest of the entire outlook. After that, the energy drops and conditions go back to poor.
The standout of the whole period is Tuesday morning, 22nd September. That's your best chance to get a wave at Diamond Street. The swell is 3ft from the SW with a 16-second period, and while the wind is onshore, it's light. The energy is solid at 526. It's not perfect, but it's the best on offer. After that, we're looking at a long stretch of poor conditions through the end of the month.
From Wednesday the 23rd through to Monday the 28th, the swell stays small – 2ft to 3ft – with persistent cross-on or onshore wind. Energy drops below 400 most days. There's a brief uptick on Thursday the 24th morning with a 3ft SW swell and onshore wind, but it's still marginal. Nothing to get excited about.
Overall, if you’re a beginner, the swell never gets over 5ft, so it’s manageable. But the onshore wind is the real killer. The best bet is Tuesday the 22nd morning. Get on it if you can, but don’t expect a classic.
Stay tuned, forecasts can change. Rusty out.
Short Range ForecastMostly dry. Warm (max 22°C on Sun morning, min 19°C on Tue morning). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 22°C on Fri afternoon, min 19°C on Tue night). Wind will be generally light. | ||||||||||||||||||
Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | ||||||||||||||
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 14 | SW 13 | SW 13 | W 10 | W 8 | SW 18 | SW 17 | SW 16 | SSW 20 | SW 16 | SW 17 | SW 16 | SW 16 | SW 15 | SW 15 | SW 14 | SW 19 | SW 19 | SW 19 |
Wave Graph  | |||||||||||||||||||
 kJ | 158 | 113 | 109 | 220 | 239 | 173 | 147 | 161 | 149 | 121 | 358 | 254 | 367 | 280 | 255 | 214 | 303 | 303 | 183 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | on | cross-on | cross-on | cross-on | cross-on | cross-on | on | glassy | on | cross-on | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross |
High Tide | 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 | 1:08PM1.45m | 2:38PM1.36m | ||||||||
Low Tide | 5:01AM0.24m | 5:43PM0.15m | 5:24AM0.43m | 6:28PM0.21m | 5:45AM0.61m | 7:21PM0.29m | 5:56AM0.77m | 8:32PM0.38m | 5:20AM0.89m | 10:13PM0.41m | 11:51PM0.34m | ||||||||
 |  | |  | | | | | | | | | |  | | | | | | |
 | — | 6:31 | — | — | 6:31 | — | — | 6:31 | — | — | 6:33 | — | — | 6:33 | — | — | 6:33 | — | — |
 | — | — | 6:58 | — | — | 6:57 | — | — | 6:54 | — | — | 6:53 | — | — | 6:52 | — | — | 6:51 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 21 | 22 | 22 | 21 | 21 | 21 | 21 | 20 | 21 | 20 | 20 | 21 | 20 | 21 | 20 | 20 | 21 | 22 | 21 |
Feels °C | 23 | 22 | 22 | 23 | 20 | 20 | 22 | 20 | 21 | 21 | 20 | 21 | 20 | 21 | 19 | 20 | 21 | 21 | 21 |
Swell 1 Height (m) Direction Period (s) | W 5 | W 6 | W 7 | W 10 | W 8 | W 8 | W 9 | W 9 | W 9 | W 8 | SW 17 | SW 16 | SW 16 | SW 15 | SW 15 | SW 14 | SW 14 | SW 13 | W 6 |
| kJ | 21 | 54 | 59 | 220 | 239 | 173 | 123 | 97 | 81 | 51 | 358 | 254 | 367 | 280 | 255 | 214 | 162 | 144 | 34 |
Swell 2 Height (m) Direction Period (s) | SW 14 | SW 13 | SW 13 | SW 13 | SW 18 | SW 18 | SW 17 | SW 16 | SW 16 | SW 16 | W 8 | W 6 | W 6 | SSW 12 | SW 21 | SW 21 | SW 19 | SW 19 | SSW 13 |
| kJ | 158 | 113 | 109 | 61 | 150 | 150 | 147 | 161 | 121 | 121 | 30 | 17 | 10 | 46 | 162 | 153 | 303 | 303 | 154 |
Swell 3 Height (m) Direction Period (s) | 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 | SW 21 | S 9 | S 9 | W 5 | S 8 | SW 19 |
| kJ | 13 | 12 | 67 | 127 | 60 | 55 | 53 | 23 | 149 | 83 | 15 | 14 | 14 | 116 | 25 | 25 | 14 | 5 | 183 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | W 3 | WNW 4 | — | W 6 | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 5 | — | 15 | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 13 | 6 | 15 | 6 | 130 | 154 | 6 | 130 | 15 | 0 | 15 | 15 | 14 | 14 | 14 | 14 | 14 | 14 | 14 |
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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