Surf Forecasts:
Blacks Reef surf forecast from 25 Aug 2026:
- Best quality surf: Monday 31 Aug, 6PM (local time) - 15ft (4.5m), 11s period, S swell with cross-onshore winds.
- Most powerful swell: Monday 31 Aug, 6PM (local time) - 15ft (4.5m), 11s period, S swell with 4,569 kJ wave energy.
- Next surfable swell (1★+): Tuesday 25 Aug, 9PM (local time) - 2.5ft (0.7m), 16s period with S swell.
Best Forecast Surf Conditions for Blacks Reef this week:
The surf forecast for Blacks Reef over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Tuesday (Aug 25) at 9PM. The primary swell is predicted to be 0.7m and 16s period with a secondary swell of 0.9m and 11s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Blacks Reef in the next 16 days are 4.5m 11s and forecast to arrive on Monday (Aug 31) at 6PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 6s period and expected on Friday (Aug 28) at 3PM.
| Wave Type | Time (NZST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Tue 25th Aug) | 2.5ft (0.7m) 16s |
| Best Surf | 6PM (Mon 31st Aug) | 15ft (4.5m) 11s |
| Most Powerful | 6PM (Mon 31st Aug) | 15ft (4.5m) 11s |
Table - best surf conditions forecast for Blacks Reef over the next 16 days.
The Lowdown
Alright, folks, Rusty here. Let’s talk about what’s coming up for Blacks Reef.
We’ve got a real mixed bag over the next couple of weeks. The opener on Tuesday morning is small but clean, with a 4ft south swell at 12 seconds. The water is a bit colder than normal for this time of year, sitting at 53°, so you’ll want a good spring suit. The combined energy is moderate at 467, and with that light cross-off breeze, it’s plenty surfable for a beginner-friendly reef. Tuesday afternoon goes glassy with a light offshore, dropping to 3ft but still packing moderate energy at 417 – that’s the pick of the early days for a smooth session.
Wednesday the 26th looks even better, with the swell dropping a touch to 3ft in the morning but the period stretching out to a very long 18 seconds. That groundswell carries moderate energy at 531, and with sunny skies and a light cross-off, you’ve got clean, lined-up waves. The afternoon glass-off with a 3ft, 16-second south swell is just as good – 563 energy and glassy conditions. This is your mid-week highlight.
Thursday the 27th gets a bit dicey. The morning is onshore and choppy with 5ft, but the afternoon turns it around: 7ft of south swell at 17 seconds, pumping strong energy at 2485, and a clean cross-off breeze. That’s for experienced surfers only, given the size and power. Friday the 28th stays solid with a 5ft morning under a clean offshore NNE breeze at 12 mph, energy at 798 – nice and punchy. The afternoon eases off but stays tidy.
The weekend fades. Saturday the 29th has waist-high waves with light winds, but the energy drops to 232. Sunday the 30th is barely worth a paddle, with 2ft and then 1ft, and by Sunday afternoon the cross-shore wind chops it up. Monday the 31st sees a massive jump in size – 13ft to 15ft of strong south swell, but it’s onshore and messy, with strong energy (2748 to 4308). That’s a kite-surfing day, not a paddling one.
Looking into the second week, Tuesday the 1st of September is a standout: 7ft in the morning with a glassy offshore, clean, and 1389 energy. The afternoon holds 6ft at 14 seconds with 1472 energy – excellent for experienced surfers. Then we hit a flat spell. Wednesday and Thursday get chopped by cross-shore and onshore winds, with dwindling swell. Friday the 4th to Monday the 7th of September are all under 3ft, with weak energy below 150 most of the time. There’s a 3–4 day gap of barely surfable waves.
On Tuesday the 8th of September, things perk up: a 7ft south swell at 8 seconds arrives, with 916 energy and a clean cross-off breeze – that’s a late surprise for the brave on a short board. Wednesday the 9th brings 8ft at 11 seconds (1783 energy) but a slight onshore wind keeps it lumpy.
Alright, the real standout is Wednesday the 26th of August – that very long period groundswell with glassy conditions is as clean as it gets for a beginner-friendly reef. And for the more experienced crew, Tuesday the 1st of September offers the best combo of size, clean wind, and solid energy.
Stay stoked.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Wed night. Very mild (max 18°C on Wed afternoon, min 10°C on Thu afternoon). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 4mm), mostly falling on Sun night. Very mild (max 18°C on Sat afternoon, min 9°C on Sun night). Winds increasing (calm on Sat morning, strong winds from the SSW by Sun night). | ||||||||||||||||||||
Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | |||||||||||||||
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) | S 12 | S 12 | S 15 | S 18 | S 16 | S 16 | S 17 | S 17 | S 15 | S 13 | S 13 | S 12 | S 11 | S 11 | S 11 | S 11 | SSE 10 | SSW 14 | S 9 | S 10 | S 11 |
Wave Graph | |||||||||||||||||||||
439 | 294 | 218 | 390 | 535 | 427 | 1526 | 2326 | 1812 | 780 | 526 | 290 | 205 | 160 | 116 | 79 | 33 | 65 | 2748 | 4308 | 2567 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | glassy | cross-off | cross-off | glassy | cross | cross-on | cross-off | off | off | cross-off | cross-off | cross-off | off | off | cross-off | cross | on | on | on | cross-off |
High Tide | 3:28PM1.49m | 3:46AM1.38m | 4:13PM1.49m | 4:33AM1.38m | 4:59PM1.50m | 5:22AM1.41m | 5:47PM1.53m | 6:11AM1.46m | 6:33PM1.57m | 6:58AM1.52m | 7:20PM1.62m | 7:44AM1.59m | 8:05PM1.66m | ||||||||
Low Tide | 9:11AM0.44m | 9:43PM0.43m | 10:00AM0.41m | 10:29PM0.39m | 10:48AM0.36m | 11:15PM0.34m | 11:32AM0.32m | 00:03AM0.30m | 12:17PM0.28m | 00:49AM0.26m | 1:02PM0.25m | 1:35AM0.24m | 1:48PM0.24m | 2:20AM0.23m | |||||||
6:41 | — | — | 6:41 | — | — | 6:39 | — | — | 6:37 | — | — | 6:35 | — | — | 6:35 | — | — | 6:33 | — | — | |
— | 5:38 | — | — | 5:39 | — | — | 5:40 | — | — | 5:42 | — | — | 5:43 | — | — | 5:44 | — | — | 5:45 | — | |
mm | — | — | — | — | — | 1 | 1 | — | — | — | — | — | — | — | 1 | — | — | 3 | — | — | — |
Temp °C | 15 | 16 | 12 | 16 | 18 | 15 | 11 | 11 | 12 | 17 | 15 | 15 | 17 | 18 | 15 | 16 | 15 | 11 | 10 | 10 | 7 |
Feels °C | 13 | 14 | 9 | 14 | 16 | 11 | 8 | 9 | 8 | 13 | 12 | 11 | 16 | 16 | 12 | 11 | 10 | 7 | 2 | 4 | 4 |
Swell 1 Height (m) Direction Period (s) | S 12 | S 12 | S 11 | S 18 | S 16 | S 16 | S 17 | S 17 | S 15 | S 13 | S 13 | S 12 | S 11 | S 11 | NE 7 | S 11 | NE 6 | SSW 9 | NE 8 | — | NE 9 |
439 | 294 | 143 | 390 | 535 | 427 | 1526 | 2326 | 1812 | 780 | 526 | 290 | 205 | 160 | 55 | 79 | 19 | 28 | 24 | — | 12 | |
Swell 2 Height (m) Direction Period (s) | SE 13 | S 18 | S 15 | SSW 10 | SE 13 | SE 12 | S 6 | S 7 | ESE 10 | SE 15 | SE 15 | SE 14 | SE 13 | SE 13 | S 11 | NE 6 | SSE 10 | SSW 14 | — | — | — |
27 | 97 | 218 | 98 | 26 | 23 | 60 | 147 | 11 | 9 | 8 | 7 | 27 | 26 | 116 | 19 | 33 | 65 | — | — | — | |
Swell 3 Height (m) Direction Period (s) | NE 5 | SE 13 | SE 12 | SE 13 | E 10 | E 10 | ESE 11 | ESE 11 | E 16 | SE 15 | SE 12 | N 9 | NE 9 | S 15 | S 14 | SE 12 | SSW 11 | NE 6 | — | — | — |
4 | 26 | 25 | 43 | 2 | 2 | 13 | 12 | 5 | 9 | 6 | 2 | 3 | 19 | 37 | 6 | 22 | 10 | — | — | — | |
Wind waves Height (m) Direction Period (s) | WNW 2 | — | — | — | — | NW 3 | S 6 | — | NE 4 | NE 4 | NE 6 | NE 6 | NE 5 | NE 6 | NW 3 | WNW 3 | NNW 3 | WSW 4 | S 9 | S 10 | S 11 |
1 | — | — | — | — | 5 | 94 | — | 18 | 34 | 58 | 31 | 40 | 32 | 5 | 3 | 1 | 27 | 2748 | 4308 | 2567 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 0 | 33 | 62 | 0 | 0 | 0 | 3 | 0 | 0 | 0 | 0 | 0 | 9 | 99 | 89 | 139 | 2 |
Best forecast wave conditions in Gisborne and Mahia | |||||||||||||||||||||
Best forecast wave conditions in New Zealand | |||||||||||||||||||||
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Information about the Blacks Reef Surf forecast
The above surf forecast table for Blacks Reef provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Blacks Reef can be found by selecting the local surf guide option on the grey menu. Our Blacks Reef 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 (Blacks Reef) 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 Blacks Reef 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.
Blacks Reef is 50 km (31 miles) from the city of Gisborne. If you plan a holiday in Gisborne and Mahia, look for hotels and other accommodation in Gisborne. Gisborne has rooms for a wide range of budgets as well as car hire and transport links.











