Surf Forecasts:
The Rock surf forecast from 13 Jul 2026:
- Most powerful swell: Monday 20 Jul, 11AM (local time) - 3.5ft (1.1m), 18s period, S swell with 759 kJ wave energy.
Best Forecast Surf Conditions for The Rock this week:
The most powerful waves expected at The Rock in the next 16 days are 1.1m 18s and forecast to arrive on Monday (Jul 20) at 11AM. Winds are predicted to be cross-shore at the time the swell arrives.
| Wave Type | Time (+0530) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 11AM (Mon 20th Jul) | 3.5ft (1.1m) 18s |
Table - best surf conditions forecast for The Rock over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at what’s on the cards for the next couple of weeks.
We’ve got a bit of a slow start, to be honest. The Rock is our only real option on the table, and it’s a tricky one. The good news is there’s a deep, long-period groundswell in the mix, but the wind is going to be a constant battle. For the first few days, we’re looking at moderate cross and cross-onshore breezes, making things choppy. The waves are small, around 2ft to 4ft, and the conditions are just rough. The combined energy is moderate at best, with values like 797 (moderate wave energy) and 739 (moderate wave energy), but the surface is a mess. Not worth paddling out for.
The pattern stays pretty grim through the end of the first week. The Rock is a beginner-friendly reef, but with the wind blowing 16-16 mph from the west and cross-shore, it’s just not clean. There’s a bit of a bump in swell around the 20th of July, with the combined energy jumping to 1321 (strong wave energy), but the wind is still cross-shore, and the waves are only 4ft. It’s marginal, not a standout.
The real interesting window is looking at the 24th of July and 25th of July. On the 24th, we see a small shift, with the swell going more west and the period dropping to 10 seconds, but the energy is still moderate at 865 (moderate wave energy). Not great. But the 25th of July is the one to watch. The combined energy is 1023 (strong wave energy), with a 4ft to 4ft swell from the SSW and a period of 15 to 16 seconds. That’s a proper groundswell. The wind is still moderate and cross-shore, so it won’t be glassy, but it’s the best combination of size and energy on offer. The Rock is a reef, so that long period will wrap in nicely, giving it some shape. It’s not a perfect day, but it’s the best of a very average run.
Keep in mind, this is a fairly consistent break, so it’s not a total write-off, but for the first 10 days, you’re fighting the wind. The long-range stuff on the 25th is promising but less certain. I’d keep an eye on it.
Rusty, out.
Short Range ForecastMostly dry. Warm (max 29°C on Wed afternoon, min 26°C on Wed night). Wind will be generally light. | Days 5-7 Weather SummaryModerate rain (total 17mm), heaviest on Sat afternoon. Warm (max 28°C on Fri morning, min 26°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Tuesday 14 | Wednesday 15 | Thursday 16 | Friday 17 | Saturday 18 | Sunday 19 | Mon 20 | |||||||||||||||
Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | |
Swell Height Map |  |  |  |  |  |  |  |  | |||||||||||||
Wave Height (m) Direction Period (s) | S 12 | SSW 18 | S 11 | SSW 16 | SSW 15 | SSW 15 | SSW 16 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | SSW 13 | SSW 13 | S 19 | S 18 | S 16 |
Wave Graph  | |||||||||||||||||||||
 kJ | 396 | 322 | 295 | 366 | 331 | 322 | 382 | 400 | 400 | 400 | 330 | 325 | 285 | 269 | 201 | 201 | 225 | 218 | 369 | 759 | 667 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross | cross | cross | cross | cross | cross | cross | cross | cross-on | cross | cross | cross | cross | cross-on | cross | cross | cross | cross | cross |
High Tide | 2:24AM0.41m | 2:30PM0.55m | 3:04AM0.45m | 3:06PM0.55m | 3:42AM0.48m | 3:38PM0.54m | 4:18AM0.50m | 4:09PM0.52m | 4:53AM0.50m | 4:38PM0.50m | 5:27AM0.49m | 5:06PM0.46m | 6:00AM0.47m | 5:35PM0.42m | |||||||
Low Tide | 8:09AM0.10m | 9:01PM0.04m | 8:52AM0.08m | 9:32PM0.01m | 9:32AM0.08m | 10:03PM0.00m | 10:09AM0.10m | 10:33PM0.00m | 10:44AM0.12m | 11:02PM0.02m | 11:19AM0.14m | 11:30PM0.04m | 11:54AM0.17m | ||||||||
 |  | |  | |  | | | | |  | |  |  | | | | | | | | |
 | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — |
 | — | — | 6:27 | — | — | 6:27 | — | — | 6:27 | — | — | 6:27 | — | — | 6:27 | — | — | 6:27 | — | — | 6:27 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | 2 | 2 | 3 | 7 | 2 | 1 | 5 | 3 | 2 |
Temp °C | 28 | 28 | 28 | 27 | 28 | 29 | 27 | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 28 |
Feels °C | 31 | 29 | 28 | 29 | 29 | 29 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 29 | 28 | 28 | 29 | 28 |
Swell 1 Height (m) Direction Period (s) | S 12 | S 11 | S 11 | S 11 | S 11 | SSW 15 | S 11 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 9 | SSW 7 | S 7 | S 8 | S 8 | S 8 | SSW 13 | S 18 | S 16 |
| kJ | 396 | 295 | 295 | 240 | 189 | 322 | 178 | 400 | 400 | 400 | 330 | 325 | 141 | 86 | 77 | 103 | 100 | 74 | 232 | 759 | 667 |
Swell 2 Height (m) Direction Period (s) | SSW 18 | SSW 18 | SSW 16 | SSW 16 | SSW 15 | S 11 | SSW 16 | S 10 | S 10 | S 10 | S 10 | S 10 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | SSW 13 | SSW 13 | S 8 | S 13 | S 13 |
| kJ | 352 | 322 | 283 | 366 | 331 | 149 | 382 | 159 | 123 | 92 | 90 | 90 | 285 | 269 | 201 | 201 | 225 | 218 | 76 | 345 | 334 |
Swell 3 Height (m) Direction Period (s) | SE 8 | — | ESE 8 | ESE 8 | ESE 8 | SE 9 | — | ESE 8 | WNW 10 | W 10 | W 10 | W 10 | W 10 | W 10 | W 10 | W 10 | W 9 | W 9 | S 19 | WNW 9 | W 9 |
| kJ | 10 | — | 6 | 6 | 6 | 3 | — | 7 | 10 | 8 | 7 | 8 | 18 | 31 | 46 | 65 | 62 | 61 | 369 | 115 | 64 |
Wind waves Height (m) Direction Period (s) | WSW 6 | WSW 7 | WSW 7 | WSW 6 | WSW 6 | W 6 | W 6 | W 6 | W 6 | W 6 | WSW 6 | WSW 6 | W 6 | W 6 | W 6 | W 6 | W 6 | W 6 | W 6 | W 6 | W 6 |
| kJ | 139 | 180 | 161 | 127 | 147 | 115 | 94 | 89 | 83 | 77 | 86 | 80 | 83 | 92 | 91 | 80 | 109 | 89 | 86 | 102 | 86 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 193 | 669 | 779 | 193 | 669 | 875 | 193 | 192 | 764 | 193 | 192 | 875 | 193 | 192 | 192 | 193 | 192 | 192 | 193 | 192 | 192 |
Best forecast wave conditions in West Sri Lanka | |||||||||||||||||||||
Best forecast wave conditions in Sri Lanka | |||||||||||||||||||||
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Information about the The Rock Surf forecast
The above surf forecast table for The Rock provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at The Rock can be found by selecting the local surf guide option on the grey menu. Our The 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 (The 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 The 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.
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