
Surf Forecasts:
The Rock surf forecast from 20 Jul 2026:
- Most powerful swell: Tuesday 21 Jul, 8AM (local time) - 4.5ft (1.4m), 15s period, S swell with 871 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 1.4m 15s and forecast to arrive on Tuesday (Jul 21) at 8AM. 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 | 8AM (Tue 21st Jul) | 4.5ft (1.4m) 15s |
Table - best surf conditions forecast for The Rock over the next 16 days.
The Lowdown
Alright, Rusty here. Let's talk about what's on the menu for the 16-day outlook.
Honestly, it's a bit of a slow start. We're looking at a decent run of south swell, but the wind is just not playing ball for the first week. The Rock is a reef break, exposed to the south swell, and it's fairly consistent, but for the first few days, it's all cross-shore and cross-onshore winds with a moderate breeze, leaving a lot of chop on the surface. The water is about average for this time of year, nothing unusual there.
The first real chance of something half-decent comes on Tuesday, July 21st. The swell is 5 ft from the south, with a long period of 15 seconds, giving it some real push. The combined energy is moderate (969). But the wind is a cross-shore 12 mph, so it's going to be a bit messy. It's a marginal call – only worth a paddle if you're desperate, but for a beginner-friendly reef, it's not the best introduction.
The rest of that week and into the next is a write-off for quality surf. The wind stays onshore or cross-shore, and the swell drops off. We're looking at a lot of days with poor conditions, and the combined energy dips into the low hundreds. Thursday, July 24th through to Tuesday, July 29th is a real flat spell with nothing to recommend.
Things start to get interesting towards the end of the month. On Thursday, July 30th, the swell picks up a bit, but it's the afternoon that catches my eye. The swell is 3 ft from the SSW, but the period jumps to 18 seconds – that's a nice, long groundswell. The combined energy bumps up to 1031, which is moderate. Still, the wind is cross-shore at 16 mph, so it's not glassy, but it's a step in the right direction and the tide might be working.
The real standout is shaping up for the beginning of August. Monday, August 4th is the day to circle on the calendar. The morning shows a solid 8 ft swell from the SSW, with a period of 18 seconds. That's a powerful, long-period groundswell. The combined energy is a whopping 3448 – that's strong wave energy. The wind is still cross-shore at 16 mph, which is a shame, but for a reef break like The Rock, that long period will wrap in nicely. The afternoon looks similar, with 8 ft swell and 17-second period. This is expert territory, though – over 8 ft means it's for the big dogs only. The crowds are a possibility here, but on a day like that, the lineup will thin out.
The following day, Tuesday, August 5th, is still pumping with a 6 ft SSW swell and 16-second period, but it's a step down from the Monday peak. Still a solid option for the experienced crew.
So, to sum it up: the first week is a bust. The best bet is the Monday, August 4th session at The Rock, with that big, long-period groundswell, but it's a big wave day for experts only. If you're a beginner, stay out of the water until the next forecast.
Rusty.
Short Range ForecastLight rain (total 7mm), mostly falling on Mon night. Warm (max 29°C on Tue morning, min 26°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 6mm), mostly falling on Fri night. Warm (max 29°C on Fri morning, min 26°C on Thu night). Wind will be generally light. | ||||||||||||||||||
Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | Saturday 25 | Sunday 26 | ||||||||||||||
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) | S 16 | S 15 | S 14 | S 14 | S 13 | SSW 13 | S 12 | S 10 | S 10 | S 10 | SSW 15 | S 10 | SSW 13 | SSW 14 | SSW 15 | SSW 14 | SSW 14 | SSW 13 | SSW 13 |
Wave Graph | |||||||||||||||||||
620 | 847 | 703 | 529 | 421 | 225 | 141 | 118 | 210 | 168 | 188 | 151 | 158 | 261 | 270 | 293 | 356 | 307 | 246 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross | cross-on | cross | cross | cross-on | cross | cross | cross-on | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross-on |
High Tide | 6:35AM0.44m | 6:03PM0.37m | 7:16AM0.41m | 6:35PM0.32m | 8:19AM0.38m | 7:33PM0.27m | 10:32AM0.37m | 00:27AM0.27m | 12:15PM0.39m | 1:22AM0.31m | 1:06PM0.43m | 1:52AM0.35m | |||||||
Low Tide | 11:57PM0.08m | 12:34PM0.20m | 00:25AM0.13m | 1:28PM0.24m | 00:56AM0.18m | 3:36PM0.26m | 1:51AM0.22m | 6:48PM0.22m | 5:06AM0.24m | 7:26PM0.18m | 6:35AM0.21m | 7:53PM0.13m | |||||||
— | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | |
— | — | 6:27 | — | — | 6:27 | — | — | 6:27 | — | — | 6:27 | — | — | 6:27 | — | — | 6:27 | — | |
mm | 3 | — | — | — | — | — | 1 | 2 | 1 | — | — | — | 1 | — | — | 2 | 2 | 1 | 1 |
Temp °C | 27 | 29 | 29 | 27 | 29 | 29 | 27 | 28 | 28 | 27 | 29 | 29 | 27 | 29 | 29 | 27 | 28 | 29 | 27 |
Feels °C | 29 | 30 | 29 | 29 | 30 | 30 | 30 | 29 | 29 | 30 | 31 | 30 | 30 | 30 | 30 | 29 | 29 | 30 | 29 |
Swell 1 Height (m) Direction Period (s) | S 16 | S 15 | S 14 | S 14 | S 13 | SSW 13 | S 10 | S 10 | S 10 | S 10 | S 10 | S 10 | S 10 | SSW 14 | SSE 11 | S 10 | SSE 11 | SSW 13 | SSW 13 |
620 | 847 | 703 | 529 | 421 | 225 | 116 | 118 | 210 | 168 | 146 | 151 | 154 | 261 | 194 | 255 | 210 | 307 | 246 | |
Swell 2 Height (m) Direction Period (s) | W 10 | W 9 | W 9 | W 9 | W 9 | S 10 | S 12 | S 12 | W 9 | SSW 16 | SSW 15 | SSW 14 | W 8 | SSE 11 | SSW 15 | SSW 14 | SSW 14 | SSE 11 | SSE 10 |
225 | 83 | 60 | 57 | 55 | 118 | 141 | 103 | 60 | 142 | 188 | 140 | 60 | 135 | 270 | 293 | 356 | 130 | 90 | |
Swell 3 Height (m) Direction Period (s) | S 10 | — | SE 8 | SW 18 | SE 8 | W 9 | W 10 | W 9 | SSW 15 | W 9 | W 8 | S 18 | SSW 13 | S 10 | W 10 | W 10 | W 10 | W 10 | W 10 |
177 | — | 10 | 12 | 16 | 54 | 70 | 61 | 42 | 38 | 35 | 25 | 158 | 70 | 50 | 71 | 68 | 66 | 66 | |
Wind waves Height (m) Direction Period (s) | W 5 | W 6 | W 6 | W 5 | W 9 | W 6 | W 5 | W 5 | W 6 | W 5 | W 8 | W 8 | W 6 | W 4 | W 5 | W 5 | WSW 5 | WSW 5 | WSW 5 |
55 | 39 | 42 | 26 | 146 | 30 | 24 | 21 | 32 | 21 | 84 | 78 | 31 | 23 | 33 | 29 | 49 | 49 | 53 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 186 | 186 | 763 | 22 | 193 | 764 | 193 | 764 | 764 | 22 | 764 | 764 | 193 | 740 | 764 | 193 | 192 | 764 | 193 |
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.










