
Surf Forecasts:
Diamond Street surf forecast from 17 Jul 2026:
- Best quality surf: Monday 20 Jul, 2AM (local time) - 5ft (1.6m), 15s period, SSW swell with glassy winds.
- Most powerful swell: Tuesday 21 Jul, 2AM (local time) - 5ft (1.6m), 16s period, SW swell with 1,208 kJ wave energy.
- Next surfable swell (1★+): Sunday 19 Jul, 8AM (local time) - 2.5ft (0.7m), 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 Sunday (Jul 19) at 8AM. The primary swell is predicted to be 0.7m and 16s period with a secondary swell of 0.8m and 13s. 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 1.6m 16s and forecast to arrive on Tuesday (Jul 21) at 2AM. Winds are predicted to be onshore at the time the swell arrives.
| Wave Type | Time (PDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8AM (Sun 19th Jul) | 2.5ft (0.7m) 16s |
| Best Surf | 2AM (Mon 20th Jul) | 5ft (1.6m) 15s |
| Most Powerful | 2AM (Tue 21st Jul) | 5ft (1.6m) 16s |
Table - best surf conditions forecast for Diamond Street over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a good look at what’s coming up for Diamond Street over the next couple of weeks.
Right off the bat, I gotta be straight with you – the start of this run is pretty grim. We’ve got a bit of swell in the water, but it’s all coming from the SSW to SW, and the wind is just not playing ball. The first few days are a write-off. Friday the 17th and Saturday the 18th are all cross-onshore breeze, making for choppy, poor surf. The combined energy is moderate, around 365 to 461 (moderate wave energy), but it’s all messy. You’re better off staying on the beach.
The water temp is 72° – that’s 5° warmer than usual, so it’s much warmer than normal for this time of year. Not a bad thing if you’re paddling out, but the surf ain’t worth it yet.
We start to see a glimmer of hope on Sunday the 19th. The wind swings onshore from the WSW to W, and the swell starts to build. By Sunday afternoon we’re looking at 4 ft of SSW swell with a 12-second period, and the combined energy is up to 876 (moderate wave energy). The wind is light to gentle and onshore, so the conditions are unknown but much better. It’s still only marginal, but it’s the first real chance to get wet.
The best window in this whole forecast is shaping up to be Monday the 20th through Tuesday the 21st of July. Monday morning has 4 ft of SSW swell at 12 seconds, with a light onshore breeze from the W. The energy is solid at 824 (moderate wave energy). It’s a bit of a wait, but that’s the pick of the week. The wind is light, and the swell is starting to get some size. Combined with a fairly consistent break, you’ll find some clean waves if you time it right.
After that, the wind gets a bit messy again. Tuesday afternoon through Wednesday the 22nd sees the wind picking up from the NW, making it cross-onshore and choppy. The swell drops back to 3 ft. Not great.
Now, for the second week – things get a bit more interesting on the calendar. Starting Thursday the 24th of July, we see a big jump in period. The swell is 2 ft from the SW, but the period is 24 seconds – that’s a very long period groundswell. The energy is still moderate at 946, but that long period means the waves will have real shape and power. It’s a point break setup, so it’ll wrap in nicely. The wind is light and onshore, so it’s clean. This is a standout for the deeper part of the forecast – a promising one.
Saturday the 25th of July is another highlight. The swell is 3 ft from the SW at 21 seconds, with light onshore winds. The combined energy is a strong 1140 (strong wave energy). That’s a big number for Diamond Street. It’s a bit far out, so keep an eye on it, but the signs are good.
By Monday the 27th and Tuesday the 28th of July, the swell is up to 4-4 ft from the SW, with periods around 17-19 seconds and light onshore winds. The energy is strong – 1202 and 1362 (strong to very strong wave energy). That’s a lot of water moving. For a beginner spot, that 4 ft+ might be a bit much, but for the experienced crew, it’s going to be pumping. The wind is light and onshore, so the faces will be clean.
The last few days of July and into August 1st, the swell fades and the wind turns cross-onshore again. The run is pretty much over by then.
So, to sum it up: the best bets are Monday the 20th and Tuesday the 21st of July for consistent, clean surf. Then, for the long-range promise, keep the 24th, 25th, 27th, and 28th in your sights. The water is warm, and when the swell hits right, Diamond Street will be a fun, clean wave. Crowds are sometimes a thing here, so get out early.
Stay stoked, and I’ll see you in the water.
Rusty.
Short Range ForecastMostly dry. Warm (max 22°C on Sun morning, min 19°C on Sat night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 27°C on Tue morning, min 21°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
Friday 17 | Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | |||||||||||||||
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 19 | SW 18 | WSW 15 | SW 18 | SW 18 | SW 16 | SW 17 | SSW 12 | SSW 15 | SSW 12 | SSW 14 | SW 16 | SW 16 | SW 15 | SW 15 | SW 14 | SW 14 | SW 14 | SW 14 | SSW 13 | SSW 13 |
Wave Graph | |||||||||||||||||||||
181 | 102 | 142 | 366 | 255 | 93 | 342 | 418 | 1024 | 405 | 845 | 1208 | 406 | 375 | 370 | 346 | 407 | 241 | 238 | 390 | 384 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross-on | on | cross | on | on | glassy | on | cross-on | on | cross-on | cross-on | cross | cross-on | cross | cross-on | cross-on | cross-on | cross-on |
High Tide | 12:44PM1.44m | 00:05AM1.71m | 1:27PM1.47m | 00:57AM1.44m | 2:12PM1.50m | 1:59AM1.18m | 3:01PM1.51m | 3:26AM0.96m | 3:54PM1.53m | 5:38AM0.87m | 4:51PM1.55m | 7:42AM0.93m | 5:47PM1.60m | ||||||||
Low Tide | 6:28PM0.53m | 7:10AM-0.05m | 7:30PM0.55m | 7:47AM0.16m | 8:44PM0.56m | 8:25AM0.38m | 10:14PM0.52m | 9:05AM0.58m | 11:50PM0.41m | 9:57AM0.75m | 1:04AM0.27m | 11:10AM0.85m | 1:56AM0.13m | ||||||||
5:52 | — | — | 5:52 | — | — | 5:54 | — | — | 5:54 | — | — | 5:54 | — | — | 5:54 | — | — | 5:56 | — | — | |
— | 7:57 | — | — | 7:55 | — | — | 7:55 | — | — | 7:54 | — | — | 7:54 | — | — | 7:53 | — | — | 7:53 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 21 | 21 | 20 | 21 | 21 | 20 | 22 | 22 | 21 | 24 | 24 | 24 | 27 | 25 | 22 | 22 | 22 | 22 | 23 | 23 | 22 |
Feels °C | 20 | 20 | 20 | 21 | 21 | 21 | 22 | 22 | 22 | 23 | 23 | 24 | 26 | 23 | 23 | 21 | 21 | 22 | 24 | 23 | 23 |
Swell 1 Height (m) Direction Period (s) | W 8 | W 8 | WSW 15 | SW 18 | SW 18 | S 10 | S 12 | SSW 12 | SSW 15 | SSW 12 | SSW 14 | SW 16 | SSW 10 | SW 9 | SW 15 | SW 14 | SW 14 | W 7 | W 7 | W 7 | SSW 13 |
80 | 45 | 142 | 366 | 255 | 78 | 309 | 418 | 1024 | 405 | 845 | 1208 | 288 | 225 | 370 | 346 | 407 | 131 | 134 | 103 | 384 | |
Swell 2 Height (m) Direction Period (s) | SW 14 | SW 14 | W 8 | S 12 | S 11 | SW 16 | SW 17 | SW 17 | W 15 | SW 15 | WNW 14 | WNW 14 | SW 16 | SW 15 | SSW 8 | SW 8 | SSW 7 | SW 14 | S 12 | SSW 13 | W 7 |
103 | 102 | 33 | 71 | 94 | 93 | 342 | 408 | 38 | 380 | 40 | 20 | 406 | 375 | 123 | 67 | 18 | 241 | 196 | 390 | 59 | |
Swell 3 Height (m) Direction Period (s) | SW 19 | SW 18 | SSW 11 | W 7 | W 7 | WSW 13 | WNW 15 | WNW 15 | W 6 | W 14 | S 14 | S 14 | WSW 13 | W 13 | WSW 21 | S 12 | WSW 20 | S 14 | SW 14 | SW 26 | SW 26 |
181 | 83 | 43 | 24 | 15 | 69 | 45 | 44 | 6 | 37 | 15 | 16 | 113 | 14 | 44 | 27 | 37 | 136 | 238 | 105 | 105 | |
Wind waves Height (m) Direction Period (s) | S 3 | SSW 3 | S 3 | — | — | — | — | W 6 | — | W 6 | — | — | — | — | WNW 4 | WNW 4 | W 7 | — | — | — | — |
1 | 4 | 1 | — | — | — | — | 6 | — | 2 | — | — | — | — | 5 | 6 | 61 | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 62 | 130 | 6 | 6 | 15 | 6 | 15 | 15 | 0 | 15 | 14 | 15 | 14 | 15 | 15 | 15 | 15 | 14 | 14 | 14 | 7 |
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.










