Surf Forecasts:
Big Rock surf forecast from 18 Aug 2026:
- Best quality surf: Wednesday 19 Aug, 5AM (local time) - 2.5ft (0.8m), 15s period, SW swell with glassy winds.
- Most powerful swell: Wednesday 19 Aug, 11AM (local time) - 2.5ft (0.8m), 16s period, SW swell with 291 kJ wave energy.
- Next surfable swell (1★+): Wednesday 19 Aug, 5AM (local time) - 2.5ft (0.8m), 15s period with SW swell.
Best Forecast Surf Conditions for Big Rock this week:
The surf forecast for Big Rock over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Aug 19) at 5AM. The primary swell is predicted to be 0.8m and 15s period with a secondary swell of 0.8m and 7s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Big Rock in the next 16 days are 0.8m 16s and forecast to arrive on Wednesday (Aug 19) at 11AM. 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+) | 5AM (Wed 19th Aug) | 2.5ft (0.8m) 15s |
| Best Surf | 5AM (Wed 19th Aug) | 2.5ft (0.8m) 15s |
| Most Powerful | 11AM (Wed 19th Aug) | 2.5ft (0.8m) 16s |
Table - best surf conditions forecast for Big Rock over the next 16 days.
The Lowdown
Alright, surfers, Rusty here. Let's have a look at what's on the cards for the next couple of weeks.
Right off the bat, I gotta be straight with you – it's looking pretty flat and quiet out there. We've got a gap right at the start with no real surf to speak of until the 18th of August, and even then, it's a struggle. The water is sitting at a warm 71°F, which is a touch warmer than normal for this time of year, so you won't need the thickest rubber.
We're looking at Big Rock as the only spot on the menu. This is a reef break, so you've got to know what you're doing. It's fairly consistent for waves, but the crowds are often here, so expect some company.
The whole 16-day window is a bit of a bummer, to be honest. The wave heights barely tickle 3 ft, and the energy is weak, with values ranging from 181 to 492 (moderate energy at its absolute best). The swell is coming from the SW, which is the optimum direction for this spot, but the real issue is the quality. The wave comment is consistently "poor surf conditions" or "marginal surf forecast or questionable tide conditions." The wind is mostly light and offshore (W or WNW) through the first week, which would normally be a massive positive for clean waves, but there just isn't enough swell to make it worthwhile.
For the first week, from the 18th to the 22nd of August, you're looking at tiny 1 ft to 3 ft of SW swell. The period is long, up to 19 seconds, which means it's a groundswell, but it's so small it's just not going to break properly. The light offshore winds on the 18th and 19th would be magic if there was any power behind it, but it's a tease.
The second week, from the 22nd of August right through to the 2nd of September, is more of the same. We get a slight bump up to 3 ft and 3 ft around the 29th and 30th, but it's still tiny. The wind starts to shift more cross-on from the SW and SSW, which will put a little chop on the surface. The combined energy is still just moderate (up to 492), and the wave comments don't improve. It's just not good.
Honestly, there's no standout session here. The best you could hope for is a tiny, clean wave on the 18th, 19th, or 22nd if the offshore wind holds, but it's a real gamble. For a reef break needing a bit of oomph, this is a no-go. If you're desperate for a paddle, you might find a knee-high dribbler, but I wouldn't hold your breath.
Rusty.
Short Range ForecastMostly dry. Warm (max 23°C on Wed morning, min 21°C on Tue morning). Wind will be generally light. | Days 4-6 Weather SummarySome drizzle, heaviest during Sun afternoon. Warm (max 25°C on Sat morning, min 22°C on Fri morning). Wind will be generally light. | ||||||||||||||||||||
Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | |||||||||||||||
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 17 | SW 15 | SW 16 | SW 16 | SW 15 | SW 14 | SW 14 | SW 14 | SW 13 | SSW 13 | SSW 13 | SW 18 | SSW 15 | SSW 15 | SW 19 | SW 18 | SSW 14 | SW 18 | SW 17 | SW 17 |
Wave Graph | |||||||||||||||||||||
211 | 144 | 258 | 291 | 291 | 217 | 211 | 211 | 153 | 142 | 114 | 113 | 109 | 142 | 188 | 173 | 152 | 233 | 252 | 137 | 222 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross-on | on | on | cross | cross-on | cross-on | glassy | cross-on | cross-on | glassy | on | on | cross-on | on | on | on | on | cross-on | cross-on |
High Tide | 1:42PM1.49m | 3:28AM0.88m | 2:37PM1.45m | 3:54PM1.43m | 8:26AM1.03m | 5:14PM1.47m | 8:32AM1.09m | 6:16PM1.55m | 8:46AM1.14m | 7:02PM1.65m | 9:01AM1.19m | 7:40PM1.74m | |||||||||
Low Tide | 9:15PM0.47m | 7:07AM0.79m | 11:03PM0.41m | 00:25AM0.30m | 10:32AM1.01m | 1:16AM0.18m | 12:09PM0.97m | 1:53AM0.09m | 12:58PM0.88m | 2:23AM0.01m | 1:35PM0.78m | 2:50AM-0.04m | |||||||||
6:13 | — | — | 6:13 | — | — | 6:15 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:18 | — | — | |
— | 7:30 | — | — | 7:30 | — | — | 7:29 | — | — | 7:27 | — | — | 7:25 | — | — | 7:24 | — | — | 7:23 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — |
Temp °C | 22 | 22 | 22 | 23 | 23 | 22 | 23 | 23 | 22 | 23 | 24 | 23 | 25 | 24 | 23 | 25 | 24 | 24 | 25 | 24 | 23 |
Feels °C | 23 | 22 | 23 | 24 | 23 | 24 | 24 | 23 | 24 | 23 | 24 | 25 | 25 | 24 | 24 | 26 | 25 | 24 | 25 | 24 | 24 |
Swell 1 Height (m) Direction Period (s) | W 6 | W 6 | W 7 | W 7 | W 7 | SW 15 | SW 14 | SW 14 | SW 14 | SW 13 | SSW 13 | SSW 13 | WNW 8 | SSW 15 | SSW 15 | SSW 13 | SSW 13 | SSW 14 | W 6 | W 6 | W 6 |
51 | 54 | 56 | 77 | 62 | 217 | 211 | 211 | 153 | 142 | 114 | 113 | 21 | 142 | 188 | 114 | 116 | 233 | 36 | 36 | 86 | |
Swell 2 Height (m) Direction Period (s) | SW 16 | SW 13 | SW 15 | SW 16 | SW 16 | W 6 | W 6 | W 6 | WNW 7 | W 7 | WNW 7 | WNW 7 | SW 12 | W 10 | W 10 | W 10 | SW 18 | SW 18 | SW 18 | SSW 14 | SW 17 |
211 | 144 | 258 | 291 | 291 | 38 | 28 | 28 | 17 | 14 | 15 | 15 | 51 | 68 | 48 | 49 | 152 | 155 | 252 | 131 | 222 | |
Swell 3 Height (m) Direction Period (s) | SW 13 | SW 17 | SW 19 | SW 20 | S 8 | W 14 | SW 19 | W 13 | WNW 12 | SW 18 | SW 17 | WNW 11 | SW 18 | SSW 12 | SW 19 | SW 19 | WNW 6 | W 6 | SSW 14 | SW 17 | SSW 13 |
83 | 135 | 15 | 16 | 1 | 15 | 57 | 13 | 27 | 82 | 73 | 23 | 109 | 56 | 94 | 173 | 12 | 15 | 120 | 137 | 101 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | WNW 6 | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 53 | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 18 | 18 | 18 | 18 | 18 | 4 | 66 | 18 | 0 | 127 | 18 | 0 | 18 | 18 | 4 | 18 | 18 | 18 | 18 | 18 | 18 |
Best forecast wave conditions in San Diego County | |||||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||||
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Information about the Big Rock Surf forecast
The above surf forecast table for Big Rock provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Big Rock can be found by selecting the local surf guide option on the grey menu. Our Big Rock 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 (Big Rock) 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 Big Rock 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.
Big Rock is 11 km (7 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.











