
Surf Forecasts:
Mirissa surf forecast from 4 Aug 2026:
- Most powerful swell: Friday 7 Aug, 11PM (local time) - 6ft (1.9m), 17s period, S swell with 2,117 kJ wave energy.
Best Forecast Surf Conditions for Mirissa this week:
The most powerful waves expected at Mirissa in the next 16 days are 1.9m 17s and forecast to arrive on Friday (Aug 07) at 11PM. 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 | 11PM (Fri 7th Aug) | 6ft (1.9m) 17s |
Table - best surf conditions forecast for Mirissa 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.
Right off the bat, I gotta be straight with you – the next week and a half is a bit of a struggle. We’ve got swell, no doubt about it, with combined wave energy sitting in the strong range (often between 1500 and 2200), and the swell direction is coming from the south and south-southwest, which is a good angle. But the problem is that wind. A steady 16 mph cross-shore from the West is blowing a lot of these sessions out, making it choppy. The first proper clean window doesn’t really show up until Sunday the 9th of August in the afternoon. Until then, it’s mostly cross-chop and stormy conditions, and the scores reflect that – it’s just not worth paddling out for the most part.
The standout moment across the whole outlook is definitely the last few days, from the 18th and especially the 19th of August. The swell is pumping up, and we’re seeing the strongest combined energy of the whole period, hitting 2900 and nearly 3000. That’s serious power. The wave heights are pushing 7 ft, and the wind finally turns favorable, going cross-offshore in the afternoon. This is where Mirissa (Sri Lanka) will be at its best. It’s a reef break, fairly consistent, and that south-southwest swell is right in its sweet spot.
The water’s sitting at 83°, with a positive anomaly of 2°, so it’s a touch warmer than average for this time of year. That’s a nice bonus. But don’t get too excited for the beginners. At 7 ft, this is getting up there – it’s going to be a proper session for experienced surfers only. The swell period is around 16 to 17 seconds, which is a long-period groundswell. That means clean, powerful lines with good shape, but long waits between sets. On a reef like Mirissa, that’s a dream setup, but on a beach break, that long period can make things close out. Here, it’s a positive.
The crowds are marked as "often" at Mirissa, so expect company. It’s a popular spot, and when the conditions line up like this, everyone will know. The Tuesday afternoon on the 19th looks like the pick of the bunch – clean conditions, solid 7 ft swell from the SSW, and that strong energy. The morning of the 19th is also good, but the wind is a bit more cross, so the afternoon has the edge.
Before that, the only other session that looks half-decent is the Sunday afternoon on the 9th of August. You’ve got 6 ft from the south, a 17-second period, and a cross-offshore breeze. The energy is strong at 2217. It’s a good session, but it’s not quite the peak of what’s coming. The Monday afternoon on the 10th also has a clean window, but the swell drops to 4 ft, so it’s smaller.
The period between the 12th and the 17th of August is a real lull. The swell drops off, the energy dips below 1000, and the wave heights are under 3 ft. There’s a bit of a clean spell on the 12th and 13th, but it’s tiny. Honestly, that’s a good time to rest, fix your gear, or go for a swim.
So, to wrap it up: the first week is a write-off thanks to the wind. The 9th and 10th offer a couple of clean, moderate sessions. But the real gold is sitting at the end of the outlook, on the 19th of August. Mark it in your calendar. Big swell, long period, clean wind, and a reef break that loves that direction. It’s going to be a good one.
Rusty.
Short Range ForecastHeavy rain (total 45mm), heaviest during Tue morning. Warm (max 27°C on Tue morning, min 26°C on Tue morning). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 61mm), heaviest during Fri night. Warm (max 27°C on Fri morning, min 25°C on Sat night). Wind will be generally light. | ||||||||||||||||||||
Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | |||||||||||||||
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) | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 19 | SSW 18 | SSW 17 | S 16 | SSW 16 | S 14 | S 14 | S 17 | S 16 | SSW 15 | S 16 | S 13 | S 17 | S 16 | S 15 | SSW 14 | S 21 |
Wave Graph | |||||||||||||||||||||
998 | 974 | 845 | 845 | 959 | 1929 | 1450 | 1496 | 871 | 931 | 918 | 946 | 1855 | 817 | 1591 | 640 | 1907 | 620 | 636 | 622 | 584 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross-off | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross-off | cross | cross | cross-off | cross |
High Tide | 5:13PM0.44m | 5:58AM0.49m | 5:39PM0.39m | 6:40AM0.45m | 6:06PM0.33m | 7:44AM0.41m | 6:33PM0.27m | 10:22AM0.39m | 00:30AM0.27m | 12:22PM0.43m | 1:20AM0.33m | 1:14PM0.47m | 1:54AM0.40m | ||||||||
Low Tide | 11:28AM0.12m | 11:25PM0.05m | 12:06PM0.16m | 11:51PM0.09m | 12:58PM0.21m | 00:21AM0.14m | 2:59PM0.26m | 1:08AM0.20m | 7:02PM0.21m | 5:06AM0.22m | 7:27PM0.15m | 6:45AM0.18m | 7:53PM0.10m | ||||||||
6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | |
— | 6:24 | — | — | 6:24 | — | — | 6:23 | — | — | 6:23 | — | — | 6:23 | — | — | 6:23 | — | — | 6:22 | — | |
mm | 7 | 1 | 3 | 4 | 4 | 7 | 2 | 3 | 14 | 2 | 3 | 11 | 6 | 6 | 14 | 7 | 5 | 7 | 3 | 2 | 3 |
Temp °C | 27 | 27 | 27 | 27 | 27 | 26 | 27 | 27 | 26 | 27 | 27 | 26 | 26 | 26 | 26 | 26 | 27 | 26 | 27 | 27 | 26 |
Feels °C | 27 | 27 | 28 | 28 | 27 | 27 | 28 | 27 | 27 | 27 | 27 | 27 | 26 | 26 | 27 | 27 | 28 | 28 | 28 | 27 | 28 |
Swell 1 Height (m) Direction Period (s) | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 15 | SSW 18 | SSW 17 | S 16 | SSW 16 | S 14 | S 14 | S 17 | S 16 | SSW 15 | S 16 | S 13 | S 17 | S 12 | S 10 | SSW 14 | S 13 |
998 | 974 | 845 | 845 | 678 | 1929 | 1450 | 1496 | 871 | 931 | 918 | 946 | 1855 | 817 | 1591 | 640 | 1907 | 380 | 284 | 622 | 440 | |
Swell 2 Height (m) Direction Period (s) | S 8 | S 7 | S 7 | SSW 21 | SSW 19 | — | S 10 | — | S 10 | S 18 | S 18 | S 13 | — | S 11 | S 19 | S 16 | WNW 11 | S 16 | S 15 | S 10 | SSE 10 |
28 | 37 | 25 | 566 | 959 | — | 149 | — | 212 | 670 | 635 | 546 | — | 279 | 111 | 507 | 38 | 620 | 636 | 245 | 193 | |
Swell 3 Height (m) Direction Period (s) | — | S 24 | SSW 22 | S 14 | W 11 | — | — | — | S 20 | — | — | W 14 | — | S 18 | — | WNW 11 | SSW 26 | WNW 9 | SSW 23 | SSW 21 | S 21 |
— | 11 | 156 | 4 | 64 | — | — | — | 190 | — | — | 4 | — | 224 | — | 38 | 66 | 50 | 290 | 404 | 584 | |
Wind waves Height (m) Direction Period (s) | W 10 | W 9 | W 9 | W 6 | W 6 | W 6 | W 7 | W 7 | W 7 | W 7 | W 7 | W 7 | WSW 7 | WSW 6 | W 6 | W 6 | W 6 | W 6 | W 6 | W 6 | W 6 |
610 | 471 | 416 | 253 | 261 | 339 | 432 | 411 | 428 | 434 | 388 | 371 | 299 | 245 | 269 | 259 | 206 | 156 | 148 | 129 | 137 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 179 | 183 | 179 | 179 | 163 | 187 | 179 | 179 | 187 | 179 | 179 | 187 | 186 | 187 | 187 | 187 | 186 | 187 | 179 | 186 | 187 |
Best forecast wave conditions in West Sri Lanka | |||||||||||||||||||||
Best forecast wave conditions in Sri Lanka | |||||||||||||||||||||
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Information about the Mirissa Surf forecast
The above surf forecast table for Mirissa provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Mirissa can be found by selecting the local surf guide option on the grey menu. Our Mirissa 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 (Mirissa) 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 Mirissa 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.
Mirissa is 5 km (3 miles) from the city of Weligama. If you plan a holiday in West Sri Lanka, look for hotels and other accommodation in Weligama. Weligama has rooms for a wide range of budgets as well as car hire and transport links.











