
Surf Forecasts:
Sponge bay surf forecast from 10 Aug 2026:
- Best quality surf: Tuesday 11 Aug, 6AM (local time) - 5ft (1.5m), 12s period, S swell with cross-offshore winds.
- Most powerful swell: Sunday 16 Aug, 3PM (local time) - 4ft (1.2m), 19s period, SSW swell with 1,117 kJ wave energy.
- Next surfable swell (1★+): Monday 10 Aug, 6PM (local time) - 2ft (0.6m), 10s period with SE swell.
Best Forecast Surf Conditions for Sponge bay this week:
The surf forecast for Sponge bay over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (Aug 10) at 6PM. The primary swell is predicted to be 0.6m and 10s period with a secondary swell of 0.3m and 13s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Sponge bay in the next 16 days are 1.2m 19s and forecast to arrive on Sunday (Aug 16) at 3PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.9m 8s period and expected on Saturday (Aug 15) at 3AM.
| Wave Type | Time (NZST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6PM (Mon 10th Aug) | 2ft (0.6m) 10s |
| Best Surf | 6AM (Tue 11th Aug) | 5ft (1.5m) 12s |
| Most Powerful | 3PM (Sun 16th Aug) | 4ft (1.2m) 19s |
Table - best surf conditions forecast for Sponge bay over the next 16 days.
The Lowdown
Alright, this is Rusty, and I’ve got the lowdown on Sponge Bay. Let’s get into it.
Alright, look, it’s gonna be a tough slog for the next week and a half at Sponge Bay. There’s some surf on offer, but the wind is gonna be the enemy most of the time. We’ve got a long dry spell before things finally line up proper. The water temp is sitting at 55°, which is a bit colder than normal for this time of year, so you’ll want a good suit.
Monday the 10th is a tease. Morning has clean little 2ft waves from the SE with a cross-off breeze, but the energy is weak, just 94. It’s surfable, but barely. The afternoon turns cross-on and gets worse.
Tuesday the 11th, the swell picks up to 5ft from the SSW, but it’s got a short period of 8 seconds and a cross wind, making it a messy affair. The energy jumps to 493, but the conditions are marginal at best. The afternoon is a write-off with strong onshore wind.
Wednesday the 12th, Thursday the 13th, and Friday the 14th are all variations of the same sad story: small, weak swell, and winds that just won’t cooperate. You might get a clean window in the mornings with a little waist-high wave, but nothing to write home about.
Saturday the 15th afternoon is the first real glimmer of hope. The swell is 5ft from the ESE, period 9 seconds, with a gentle cross-off breeze. The energy is 407 and the forecast actually says “expect good surf conditions.” That’s your best bet in the first week.
Sunday the 16th is a complete blowout. A massive 4ft swell from the SSW with a 19-second period sounds incredible, but it’s accompanied by near-gale force winds. The energy is a staggering 1960, but it’s completely unsurfable.
The whole week from Monday 17th to Wednesday 19th is just big, angry, wind-blown slop. Swell sizes from 7ft to 10ft, but all with strong, messy cross-onshore winds. Kite surfers might be frothing, but for a paddle surfer, it’s a hard pass.
Then, on Thursday the 20th, things change. The morning brings a clean 5ft swell from the SSE, with a long 16-second period and a light cross-off breeze. The energy is 1243 and it’s looking very good. The break will handle this long-period groundswell well, as it’s a beach and reef setup.
But the absolute standout is Friday the 21st morning. This is the one. We’ve got a 6ft SSE swell with an 18-second period – that’s proper groundswell – and the wind is a light cross-off. The energy is a massive 3141. The forecast says “excellent surf conditions for experienced surfers.” The size is over 5ft, so it’s not for beginners, and the long period will mean long, clean lines, especially at the reef. This is the one to circle on the calendar.
After that, Saturday the 22nd and Sunday the 23rd drop back down in size and the winds turn onshore again, fading out the run. The final few days, the 24th and 25th, are back to small or blown-out junk.
So, to sum it up: there’s a big, ugly gap of poor conditions for over a week. Your only real windows are Saturday the 15th afternoon for a fun, manageable session, and then the absolute highlight is Friday the 21st morning for the experienced crew. Get on it.
- Rusty
Short Range ForecastMostly dry. Very mild (max 15°C on Mon afternoon, min 8°C on Wed night). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 42mm), heaviest during Fri night. Very mild (max 15°C on Sat morning, min 10°C on Thu morning). Winds decreasing (fresh winds from the ENE on Fri night, light winds from the SE by Sat afternoon). | ||||||||||||||||||||
Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | |||||||||||||||
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) | SE 10 | SE 10 | SE 13 | SSW 8 | S 9 | SSE 11 | SE 8 | SE 7 | SE 10 | ESE 9 | SE 9 | SE 8 | E 6 | E 7 | E 8 | ESE 8 | ESE 9 | ESE 8 | ESE 9 | SSW 19 | ESE 10 |
Wave Graph | |||||||||||||||||||||
89 | 79 | 56 | 291 | 348 | 204 | 117 | 55 | 292 | 176 | 115 | 70 | 137 | 226 | 308 | 432 | 394 | 256 | 322 | 1117 | 375 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-on | cross-on | cross | on | cross-off | cross-off | cross-off | off | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-on | cross-on | on |
High Tide | 2:55PM1.84m | 3:29AM1.77m | 4:07PM1.85m | 4:46AM1.79m | 5:27PM1.91m | 5:54AM1.85m | 6:28PM2.00m | 6:51AM1.92m | 7:19PM2.07m | 7:42AM1.98m | 8:05PM2.10m | 8:30AM2.01m | 8:51PM2.10m | ||||||||
Low Tide | 9:16PM0.63m | 9:49AM0.51m | 10:31PM0.63m | 11:01AM0.49m | 11:47PM0.60m | 12:04PM0.45m | 00:48AM0.54m | 12:58PM0.43m | 1:39AM0.49m | 1:48PM0.42m | 2:26AM0.46m | 2:37PM0.43m | |||||||||
7:00 | — | — | 6:58 | — | — | 6:58 | — | — | 6:56 | — | — | 6:54 | — | — | 6:54 | — | — | 6:52 | — | — | |
— | 5:25 | — | — | 5:27 | — | — | 5:27 | — | — | 5:28 | — | — | 5:29 | — | — | 5:30 | — | — | 5:30 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | 2 | 3 | 21 | 3 | 6 | 7 | 2 | 5 | 13 |
Temp °C | 14 | 15 | 12 | 12 | 13 | 10 | 12 | 12 | 10 | 14 | 14 | 13 | 14 | 14 | 14 | 15 | 14 | 13 | 12 | 10 | 9 |
Feels °C | 12 | 12 | 9 | 8 | 9 | 8 | 8 | 7 | 7 | 10 | 9 | 10 | 9 | 9 | 8 | 14 | 12 | 11 | 5 | -1 | -2 |
Swell 1 Height (m) Direction Period (s) | SE 10 | SE 10 | SE 10 | SSE 9 | SSE 9 | SSE 11 | SE 8 | SE 7 | SE 10 | ESE 9 | SE 9 | SE 8 | ESE 14 | ESE 14 | E 8 | ESE 8 | ESE 9 | ESE 8 | ESE 9 | ESE 9 | ESE 10 |
89 | 79 | 44 | 113 | 232 | 204 | 117 | 55 | 292 | 176 | 115 | 70 | 19 | 20 | 308 | 432 | 394 | 256 | 322 | 528 | 375 | |
Swell 2 Height (m) Direction Period (s) | ENE 5 | ENE 6 | SE 13 | SE 12 | SE 12 | E 6 | SSE 11 | SE 9 | — | S 19 | ESE 13 | ESE 13 | S 17 | S 16 | ESE 14 | S 16 | SE 13 | SSE 21 | SSE 17 | SSE 19 | SSE 16 |
2 | 3 | 56 | 89 | 67 | 1 | 11 | 38 | — | 7 | 17 | 18 | 6 | 5 | 18 | 5 | 7 | 83 | 59 | 123 | 86 | |
Swell 3 Height (m) Direction Period (s) | S 17 | S 16 | ENE 6 | NE 6 | SE 18 | — | S 18 | SE 11 | NNE 8 | NNE 8 | S 18 | S 16 | S 16 | — | S 15 | E 13 | S 18 | NE 8 | SSE 21 | S 19 | S 20 |
5 | 5 | 3 | 2 | 13 | — | 6 | 33 | 6 | 6 | 6 | 5 | 5 | — | 4 | 4 | 6 | 57 | 45 | 192 | 31 | |
Wind waves Height (m) Direction Period (s) | — | — | — | SSW 8 | S 9 | — | NE 6 | NE 8 | NE 4 | NE 4 | ENE 4 | ENE 5 | E 6 | E 7 | ENE 8 | — | — | — | — | SSW 19 | SSE 6 |
— | — | — | 291 | 348 | — | 2 | 24 | 15 | 9 | 7 | 23 | 137 | 226 | 403 | — | — | — | — | 1117 | 170 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 36 | 3 | 3 | 43 | 0 | 0 | 44 | 0 | 0 | 88 | 1 | 88 | 97 | 99 | 1 | 0 | 0 | 68 | 118 | 118 |
Best forecast wave conditions in Gisborne and Mahia | |||||||||||||||||||||
Best forecast wave conditions in New Zealand | |||||||||||||||||||||
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Information about the Sponge bay Surf forecast
The above surf forecast table for Sponge bay provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Sponge bay can be found by selecting the local surf guide option on the grey menu. Our Sponge bay 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 (Sponge bay) 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 Sponge bay 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.
Are you planning a holiday in Gisborne and Mahia? If you are looking for accommodation near Sponge bay, camping, hotels and holiday cottages in Gisborne and Mahia, consider staying in Gisborne which is 8 km (5 miles) away.











