Surf Forecasts:
Diamond Street surf forecast from 27 Jul 2026:
- Best quality surf: Thursday 30 Jul, 11PM (local time) - 5ft (1.6m), 14s period, SSW swell with glassy winds.
- Most powerful swell: Friday 31 Jul, 2AM (local time) - 5.5ft (1.7m), 14s period, SSW swell with 1,111 kJ wave energy.
- Next surfable swell (1★+): Wednesday 29 Jul, 11PM (local time) - 4.5ft (1.4m), 16s period with SSW 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 Wednesday (Jul 29) at 11PM. The primary swell is predicted to be 1.4m and 16s period with a secondary swell of 0.6m and 7s. 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 1.7m 14s and forecast to arrive on Friday (Jul 31) at 2AM. Winds are predicted to be glassy at the time the swell arrives.
| Wave Type | Time (PDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Wed 29th Jul) | 4.5ft (1.4m) 16s |
| Best Surf | 11PM (Thu 30th Jul) | 5ft (1.6m) 14s |
| Most Powerful | 2AM (Fri 31st Jul) | 5.5ft (1.7m) 14s |
Table - best surf conditions forecast for Diamond Street over the next 16 days.
The Lowdown
Alright, Rusty here, let's break down what's happening at Diamond Street for the next couple of weeks.
Honestly, it's a pretty grim outlook. The first chance for a wave kicks off Sunday the 26th of July, but it's nothing special. There's a long-period groundswell from the southwest, with a very long 18-second period, pushing a 3ft wave. The water is a balmy 74°, which is a whopping 6° warmer than usual for this time of year – that's a real standout, very unusual. The wind is light and offshore from the southwest, which is a major positive for clean conditions. However, the combined swell energy is only moderate at 702, and the surf is described as marginal. This is a beginner spot, and with the swell under 5ft, it's a good size for learning, but the quality just isn't there.
The rest of the first week stays pretty average. From Monday the 27th to Wednesday the 29th, the southwest swell hangs around 3ft to 4ft, but the wind turns cross-onshore, making it choppy. The energy peaks at 1087 on Tuesday afternoon, but that's still just moderate. Thursday the 30th and Friday the 31st see a slight bump to 5ft and 5ft, but the period drops to 13-14 seconds, and the wind stays cross-onshore, so the surface will be messy. The best of a so-so bunch is probably Thursday morning, with a light offshore wind and a 4ft swell from the south.
Then we hit a real dead zone. From Saturday the 1st of August, the swell drops off fast. By Sunday the 2nd, we're down to 3ft, and the conditions are labeled "poor." This gap of poor to no surf carries on for over a week. The combined energy figures fall into the weak range, dropping to as low as 124. A few days in the second week, like the 6th and 7th of August, have a very long period (21 seconds) but with tiny 1ft to 2ft waves and poor conditions. It's a flat spell, plain and simple.
There are no standouts in this forecast. The conditions are too marginal and the gaps too long to recommend a specific time. For a beginner spot, the lack of quality and consistency is a real bummer. Don't get your hopes up for this one.
Rusty.
Short Range ForecastMostly dry. Warm (max 23°C on Sun afternoon, min 20°C on Tue night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 23°C on Fri morning, min 20°C on Wed night). Wind will be generally light. | |||||||||||||||||||
Sun 26 | Monday 27 | Tuesday 28 | Wednesday 29 | Thursday 30 | Friday 31 | Saturday 1 | ||||||||||||||
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 18 | SW 18 | SW 18 | SW 16 | SW 17 | SW 17 | SW 17 | SSW 16 | SW 16 | SSW 16 | SW 16 | S 13 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | SSW 13 | SSW 12 | SSW 12 | SSW 11 |
Wave Graph  | ||||||||||||||||||||
 kJ | 609 | 694 | 901 | 511 | 717 | 951 | 908 | 864 | 748 | 674 | 573 | 513 | 899 | 1111 | 892 | 892 | 824 | 573 | 466 | 234 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross-on | cross-on | cross-on | on | on | glassy | cross-on | cross-on | cross-on | on | on | cross-on |
High Tide | 7:59PM1.80m | 9:51AM1.17m | 8:34PM1.86m | 10:13AM1.21m | 9:08PM1.90m | 10:36AM1.25m | 9:39PM1.91m | 11:02AM1.30m | 10:11PM1.87m | 11:29AM1.35m | 10:44PM1.77m | 11:57AM1.41m | 11:19PM1.63m | |||||||
Low Tide | 2:03PM0.80m | 3:38AM-0.11m | 2:40PM0.74m | 4:06AM-0.16m | 3:14PM0.68m | 4:33AM-0.18m | 3:47PM0.63m | 5:00AM-0.17m | 4:22PM0.59m | 5:27AM-0.13m | 5:00PM0.57m | 5:53AM-0.05m | 5:41PM0.55m | |||||||
 |  |  | | | | | | | | | | | | | | | | | | |
 | — | — | 5:58 | — | — | 5:58 | — | — | 6:00 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — |
 | 7:52 | — | — | 7:51 | — | — | 7:50 | — | — | 7:50 | — | — | 7:49 | — | — | 7:47 | — | — | 7:46 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 23 | 22 | 22 | 22 | 21 | 22 | 22 | 21 | 22 | 22 | 21 | 22 | 22 | 21 | 23 | 23 | 22 | 23 | 23 | 22 |
Feels °C | 24 | 24 | 23 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 23 | 23 | 22 | 22 | 24 | 23 | 22 | 24 | 23 | 23 |
Swell 1 Height (m) Direction Period (s) | SW 18 | SW 18 | SW 18 | SW 16 | SW 17 | SW 17 | SW 17 | SSW 16 | SW 16 | SSW 16 | SW 16 | S 13 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | SSW 13 | SSW 12 | SSW 12 | SSW 11 |
| kJ | 609 | 694 | 901 | 511 | 717 | 951 | 908 | 864 | 748 | 674 | 573 | 513 | 899 | 1111 | 892 | 892 | 824 | 573 | 466 | 234 |
Swell 2 Height (m) Direction Period (s) | W 7 | W 8 | WNW 8 | WNW 8 | W 7 | WNW 7 | W 7 | W 7 | W 8 | S 14 | S 14 | SW 15 | W 7 | W 9 | W 8 | W 8 | W 8 | W 6 | W 6 | SW 13 |
| kJ | 47 | 57 | 99 | 81 | 54 | 91 | 70 | 54 | 55 | 196 | 329 | 380 | 26 | 40 | 36 | 33 | 29 | 19 | 20 | 113 |
Swell 3 Height (m) Direction Period (s) | SSW 11 | SSW 11 | S 11 | SW 19 | S 8 | SSE 16 | S 19 | WNW 8 | S 14 | W 7 | W 7 | W 7 | — | — | — | — | — | SW 20 | SW 20 | W 7 |
| kJ | 46 | 47 | 21 | 299 | 6 | 50 | 109 | 79 | 206 | 54 | 25 | 24 | — | — | — | — | — | 15 | 15 | 23 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 215 | 6 | 8 | 62 | 4 | 8 | 130 | 7 | 8 | 62 | 7 | 130 | 15 | 0 | 14 | 14 | 14 | 15 | 15 | 8 |
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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