Surf Forecasts:
Catlins River Mouth surf forecast from 16 Aug 2026:
- Best quality surf: Tuesday 18 Aug, 3PM (local time) - 11ft (3.5m), 13s period, SSW swell with cross-shore winds.
- Most powerful swell: Monday 24 Aug, 3AM (local time) - 21ft (6.5m), 16s period, SW swell with 20,270 kJ wave energy.
- Next surfable swell (1★+): Tuesday 18 Aug, 3PM (local time) - 11ft (3.5m), 13s period with SSW swell.
Best Forecast Surf Conditions for Catlins River Mouth this week:
The surf forecast for Catlins River Mouth over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Tuesday (Aug 18) at 3PM. The primary swell is predicted to be 3.5m and 13s period with a secondary swell of 3.0m and 14s. Another secondary swell of 0.4m and 10s is also forecast. The wind is predicted to be cross-shore as the swell arrives.
The most powerful waves expected at Catlins River Mouth in the next 16 days are 6.5m 16s and forecast to arrive on Monday (Aug 24) at 3AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 5s period and expected on Wednesday (Aug 19) at 3PM.
| Wave Type | Time (NZST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3PM (Tue 18th Aug) | 11ft (3.5m) 13s |
| Best Surf | 3PM (Tue 18th Aug) | 11ft (3.5m) 13s |
| Most Powerful | 3AM (Mon 24th Aug) | 21ft (6.5m) 16s |
Table - best surf conditions forecast for Catlins River Mouth over the next 16 days.
Short Range ForecastLight rain (total 4mm), mostly falling on Mon night. Very mild (max 10°C on Wed morning, min 6°C on Mon morning). Mainly fresh winds. | Days 4-6 Weather SummaryLight rain (total 8mm), mostly falling on Sat morning. Very mild (max 14°C on Fri afternoon, min 6°C on Sat night). Winds increasing (calm on Sat morning, fresh winds from the W by Sat night). | ||||||||||||||||||||
Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | |||||||||||||||
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 14 | SW 13 | SSW 8 | SSW 9 | SSW 13 | S 15 | S 14 | SSW 14 | S 11 | SSW 15 | SSW 16 | SSW 15 | SSW 14 | SSW 14 | SW 13 | SSW 18 | SSW 16 | SSW 18 | SW 14 | SW 14 | SSW 16 |
Wave Graph  | |||||||||||||||||||||
 kJ | 1099 | 2340 | 292 | 1026 | 4343 | 3770 | 2247 | 1680 | 535 | 1223 | 1358 | 1254 | 732 | 494 | 87 | 64 | 103 | 243 | 2004 | 7417 | 6999 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | off | cross-off | off | off | glassy | off | cross-off | off | cross-off | cross-off |
High Tide | 6:19PM2.37m | 6:46AM2.34m | 7:05PM2.28m | 7:38AM2.25m | 7:59PM2.18m | 8:38AM2.17m | 9:01PM2.11m | 9:41AM2.12m | 10:07PM2.08m | 10:44AM2.10m | 11:08PM2.07m | 11:41AM2.11m | 00:02AM2.09m | ||||||||
Low Tide | 12:16PM0.79m | 00:36AM0.88m | 1:03PM0.94m | 1:25AM1.00m | 1:52PM1.07m | 2:18AM1.10m | 2:45PM1.17m | 3:18AM1.16m | 3:45PM1.24m | 4:22AM1.17m | 4:53PM1.24m | 5:24AM1.13m | 5:56PM1.18m | ||||||||
 |  |  |  | |  | |  | | | |  | | |  |  | | | | |  | |
 | 7:39 | — | — | 7:37 | — | — | 7:35 | — | — | 7:33 | — | — | 7:31 | — | — | 7:30 | — | — | 7:28 | — | — |
 | — | 5:52 | — | — | 5:52 | — | — | 5:53 | — | — | 5:54 | — | — | 5:57 | — | — | 5:58 | — | — | 5:59 | — |
mm | — | 1 | 3 | — | — | — | — | — | — | — | — | — | — | — | 1 | 3 | — | 4 | 7 | 1 | — |
Temp °C | 9 | 9 | 9 | 9 | 9 | 9 | 10 | 10 | 8 | 9 | 10 | 9 | 11 | 14 | 12 | 9 | 14 | 9 | 7 | 7 | 8 |
Feels °C | 3 | 4 | 3 | 2 | 3 | 5 | 5 | 5 | 3 | 5 | 6 | 5 | 6 | 9 | 7 | 5 | 10 | 2 | -2 | -3 | 1 |
Swell 1 Height (m) Direction Period (s) | SSW 14 | SSW 14 | SW 13 | ENE 11 | SSW 14 | S 15 | S 14 | SSW 14 | S 11 | SSW 15 | SSW 16 | SSW 15 | SSW 14 | SSW 14 | SW 13 | S 10 | SSW 16 | SW 8 | SW 14 | SSW 15 | SSW 16 |
| kJ | 1099 | 889 | 170 | 37 | 3434 | 3770 | 2247 | 1680 | 535 | 1223 | 1358 | 1254 | 732 | 494 | 87 | 30 | 103 | 71 | 2004 | 4201 | 6999 |
Swell 2 Height (m) Direction Period (s) | ENE 10 | ENE 9 | ENE 10 | S 19 | ENE 10 | E 10 | E 10 | E 10 | SSW 14 | E 9 | E 9 | E 9 | SE 11 | E 10 | S 10 | SW 13 | SW 6 | SSW 18 | ESE 12 | ESE 13 | ESE 13 |
| kJ | 30 | 28 | 30 | 28 | 35 | 19 | 18 | 17 | 316 | 7 | 6 | 6 | 5 | 8 | 48 | 42 | 15 | 243 | 30 | 35 | 34 |
Swell 3 Height (m) Direction Period (s) | SE 16 | SE 15 | SE 14 | ESE 13 | ESE 13 | ENE 10 | ESE 12 | ESE 13 | E 10 | ESE 11 | SE 13 | SE 12 | E 9 | SE 11 | E 10 | SSW 18 | S 9 | SW 14 | — | — | — |
| kJ | 38 | 34 | 32 | 17 | 17 | 35 | 15 | 16 | 16 | 13 | 7 | 6 | 1 | 5 | 2 | 64 | 27 | 103 | — | — | — |
Wind waves Height (m) Direction Period (s) | — | SW 13 | SSW 8 | SSW 9 | SSW 13 | — | — | WSW 5 | — | — | — | — | — | NNE 4 | NE 4 | N 4 | NW 2 | W 3 | W 4 | SW 14 | W 4 |
| kJ | — | 2340 | 292 | 1026 | 4343 | — | — | 54 | — | — | — | — | — | 2 | 3 | 3 | 1 | 4 | 12 | 7417 | 18 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 21 | 8 | 10 | 256 | 364 | 21 | 8 | 8 | 8 | 0 | 8 | 0 | 10 | 0 | 0 | 0 | 0 | 377 | 0 | 995 | 57 |
Best forecast wave conditions in Catlins | |||||||||||||||||||||
Best forecast wave conditions in New Zealand | |||||||||||||||||||||
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Information about the Catlins River Mouth Surf forecast
The above surf forecast table for Catlins River Mouth provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Catlins River Mouth can be found by selecting the local surf guide option on the grey menu. Our Catlins River Mouth 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 (Catlins River Mouth) 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 Catlins River Mouth 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.
Catlins River Mouth is 91 km (57 miles) from Dunedin. If you plan a holiday in Catlins, look for hotels and other accommodation in Dunedin. Dunedin has rooms for a wide range of budgets as well as car hire and transport links.
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