Surf Forecasts:
Trestles (Lowers) surf forecast from 18 Aug 2026:
- Best quality surf: Monday 24 Aug, 5AM (local time) - 2.5ft (0.8m), 14s period, SSW swell with glassy winds.
- Most powerful swell: Tuesday 18 Aug, 8AM (local time) - 3ft (0.9m), 16s period, SSW swell with 402 kJ wave energy.
- Next surfable swell (1★+): Tuesday 18 Aug, 2AM (local time) - 2.5ft (0.8m), 14s period with SSW swell.
Best Forecast Surf Conditions for Trestles (Lowers) this week:
The surf forecast for Trestles (Lowers) over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Tuesday (Aug 18) at 2AM. The primary swell is predicted to be 0.8m and 14s period with a secondary swell of 0.7m and 6s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Trestles (Lowers) in the next 16 days are 0.9m 16s and forecast to arrive on Tuesday (Aug 18) at 8AM. 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+) | 2AM (Tue 18th Aug) | 2.5ft (0.8m) 14s |
| Best Surf | 5AM (Mon 24th Aug) | 2.5ft (0.8m) 14s |
| Most Powerful | 8AM (Tue 18th Aug) | 3ft (0.9m) 16s |
Table - best surf conditions forecast for Trestles (Lowers) over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's have a look at what the next couple of weeks are serving up for us at Trestles.
Right off the bat, I gotta be straight with you: the first week or so is a bit of a snoozer. We’re looking at a long stretch of small, weak surf from Monday the 17th of August through to at least the morning of Friday the 28th. The combined energy is pretty limp, mostly sitting in the 200 to 400 range (weak to moderate energy) with a few spikes just over 500. The swell is coming from the SSW, but it’s barely pushing 2 to 3 feet on the tape. The period is short to moderate, mostly 13 to 16 seconds, so we’re not getting any real grunt. The wind is mostly light, but it's either cross-onshore or onshore (SSW to W), so the surface is going to be a bit bumpy or at least not glassy. Honestly, it’s looking like a long stretch of marginal or poor conditions. There’s a bit of a pulse of longer period (18-19 seconds) around the 23rd and 24th, but there’s simply no size to back it up. This is not the week to burn a sick day.
Now, if you can hold out, things start to look much more interesting towards the very end of the month. The real standout window is the weekend of the 29th and 30th of August. We’ve got a proper SSW groundswell filling in. On Saturday the 29th, the swell jumps to a very surfable 4 to 5 feet with a period of 18 seconds – that’s proper long-period energy. The combined energy kicks into a strong range, hitting 1082 in the morning and 1124 in the afternoon (strong wave energy). The wind is forecast to be light and from the SW, which for Trestles is a clean, offshore wind. This is going to set it up beautifully. The wave height is in that sweet spot for advanced guys, and with offshore wind and that long period, the lines are gonna be long and bowly.
Sunday the 30th is going to be a very close second, dropping slightly to about 5 feet in the morning and 4 to 5 feet in the afternoon, but still with that long 16-second period and light offshore SW winds. The energy is still very strong (1009 and 851). If the Saturday is the top of the swell, Sunday will still be firing and potentially less crowded.
So, to sum it up for Trestles (Lowers): don’t expect much for the first 11 days. It’s a gap of mostly poor or marginal conditions. But that last weekend in August, starting Saturday the 29th and into Sunday the 30th, is where it’s at. Light offshore SW winds and a solid, long-period SSW swell in the 4 to 5 foot range will make for prime conditions. That’s the window to clear your schedule.
Rusty.
Short Range ForecastMostly dry. Warm (max 26°C on Wed morning, min 21°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 27°C on Sat morning, min 22°C on Thu night). Wind will be generally light. | |||||||||||||||||||
Mon 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | ||||||||||||||
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) | SSW 14 | SSW 14 | SSW 16 | SSW 17 | SSW 15 | SSW 16 | SSW 16 | SSW 15 | SSW 14 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | SSW 13 | SW 18 | SSW 15 | SSW 14 | SW 19 | SW 18 | SSW 14 |
Wave Graph | ||||||||||||||||||||
264 | 257 | 232 | 243 | 272 | 377 | 387 | 249 | 236 | 236 | 226 | 156 | 137 | 135 | 92 | 123 | 218 | 177 | 155 | 269 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | glassy | on | cross-on | glassy | on | on | glassy | cross-on | cross-on | glassy | on | on | glassy | cross-on | cross-on | glassy | on | on | glassy |
High Tide | 1:15AM1.05m | 1:28PM1.45m | 2:46AM0.87m | 2:22PM1.40m | 3:41PM1.37m | 8:16AM0.98m | 5:05PM1.40m | 8:13AM1.05m | 6:07PM1.49m | 8:24AM1.11m | 6:54PM1.59m | |||||||||
Low Tide | 7:30PM0.43m | 6:40AM0.56m | 8:50PM0.46m | 6:55AM0.73m | 10:43PM0.43m | 00:16AM0.32m | 9:51AM0.97m | 1:08AM0.21m | 11:54AM0.93m | 1:45AM0.11m | 12:49PM0.84m | 2:15AM0.03m | ||||||||
— | — | 6:13 | — | — | 6:15 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:18 | — | — | |
7:34 | — | — | 7:32 | — | — | 7:31 | — | — | 7:30 | — | — | 7:29 | — | — | 7:28 | — | — | 7:27 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 24 | 22 | 24 | 25 | 23 | 26 | 26 | 24 | 26 | 25 | 23 | 26 | 26 | 24 | 27 | 27 | 25 | 27 | 26 | 24 |
Feels °C | 24 | 24 | 25 | 26 | 24 | 27 | 26 | 26 | 27 | 25 | 25 | 27 | 26 | 26 | 27 | 27 | 27 | 28 | 26 | 26 |
Swell 1 Height (m) Direction Period (s) | SSW 14 | SSW 14 | W 6 | W 6 | SSW 15 | SSW 16 | SSW 16 | SSW 15 | SSW 14 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | SSW 13 | SSW 13 | SSW 15 | SSW 14 | SSW 13 | SSW 13 | SSW 14 |
264 | 257 | 37 | 39 | 272 | 377 | 387 | 249 | 236 | 236 | 226 | 156 | 137 | 135 | 92 | 123 | 218 | 137 | 135 | 269 | |
Swell 2 Height (m) Direction Period (s) | SSW 18 | W 6 | SSW 16 | SSW 17 | W 6 | W 7 | W 6 | W 6 | W 6 | W 6 | W 12 | SW 18 | SSW 16 | SSW 16 | SW 18 | SSW 12 | W 10 | SW 19 | SW 18 | SW 18 |
63 | 31 | 232 | 243 | 39 | 58 | 29 | 16 | 17 | 10 | 44 | 81 | 51 | 51 | 81 | 89 | 30 | 177 | 155 | 199 | |
Swell 3 Height (m) Direction Period (s) | S 10 | S 10 | SSW 13 | SSW 13 | SW 19 | SW 20 | W 14 | SW 18 | SW 19 | WSW 19 | S 10 | W 6 | W 6 | SW 18 | W 7 | W 6 | SW 19 | SSW 16 | SSW 16 | W 5 |
8 | 2 | 114 | 98 | 15 | 16 | 4 | 13 | 57 | 35 | 8 | 5 | 6 | 49 | 8 | 7 | 58 | 86 | 84 | 4 | |
Wind waves Height (m) Direction Period (s) | W 6 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | W 6 | — |
24 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 10 | — | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 85 | 0 | 85 | 85 | 0 | 75 | 85 | 0 | 64 | 89 | 0 | 83 | 85 | 0 | 83 | 85 | 0 | 85 | 85 | 0 |
Best forecast wave conditions in Orange County | ||||||||||||||||||||
Best forecast wave conditions in United States | ||||||||||||||||||||
Header Global | ||||||||||||||||||||
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Information about the Trestles (Lowers) Surf forecast
The above surf forecast table for Trestles (Lowers) provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Trestles (Lowers) can be found by selecting the local surf guide option on the grey menu. Our Trestles (Lowers) 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 (Trestles (Lowers)) 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 Trestles (Lowers) 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.
Trestles (Lowers) is 6 km (4 miles) from San Clemente. If you plan a vacation in Orange County, look for hotels and other accommodation in San Clemente. San Clemente has rooms for a wide range of budgets as well as car hire and transport links.











