Surf Forecasts:
Sponge bay surf forecast from 14 Aug 2026:
- Best quality surf: Friday 21 Aug, 12AM (local time) - 5ft (1.5m), 12s period, SSE swell with cross-offshore winds.
- Most powerful swell: Wednesday 19 Aug, 9AM (local time) - 13ft (4.0m), 11s period, S swell with 4,037 kJ wave energy.
- Next surfable swell (1★+): Saturday 15 Aug, 3AM (local time) - 6ft (1.8m), 8s period with E 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 Saturday (Aug 15) at 3AM. The primary swell is predicted to be 1.8m and 8s period with a secondary swell of 0.2m and 8s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Sponge bay in the next 16 days are 4.0m 11s and forecast to arrive on Wednesday (Aug 19) at 9AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 3.0m 8s period and expected on Saturday (Aug 15) at 12AM.
| Wave Type | Time (NZST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Sat 15th Aug) | 6ft (1.8m) 8s |
| Best Surf | 12AM (Fri 21st Aug) | 5ft (1.5m) 12s |
| Most Powerful | 9AM (Wed 19th Aug) | 13ft (4.0m) 11s |
Table - best surf conditions forecast for Sponge bay over the next 16 days.
The Lowdown
Alright, surfers, Rusty here. Let’s break down what Sponge Bay has in store for the next couple of weeks. I’ve been staring at the charts, and it’s a proper mixed bag. We got a wild stretch of stormy, blown-out surf coming up first, and then a much cleaner, but smaller, window of opportunity later on.
Right off the bat, we’ve got a serious run of poor conditions. The water is sitting at a notable 3°F colder than normal for this time of year, so you’ll feel that chill. For the first few days, it's all about onshore winds and building swell. Friday the 14th kicks off with moderate rain and a fresh cross-offshore breeze, but the waves are a weak, short-period mess with only 190 units of energy. It’s just not worth your time.
The weekend gets bigger but uglier. Saturday the 15th starts with a cross-on breeze, but by the afternoon, the wind drops to glassy, and we see the swell jump to 6ft with a moderate 458 units of energy. That window on Saturday afternoon is the first glimmer of hope, even though the score is still low. However, Sunday the 16th is a write-off. A strong breeze whips up to 31 mph, the swell bumps to 6ft, and it’s completely messy.
Then things get serious, and not in a good way. The beginning of the new week sees a proper pulse of energy, but it’s all for nothing. From Monday the 17th through Thursday the 20th, we’re looking at solid swell in the 10-13ft range, with energy values exploding from 1964 into the low thousands. But it's all accompanied by strong, cross-onshore winds. It’s big, it’s raw, and for a beach and reef setup like this, it’s just going to be a brutal, blown-out wall of whitewater. This is definitely not beginner territory. Honestly, with that much wind and sea, this stretch looks way more interesting for the kite surfers than for us paddle guys.
Now, here’s where things start to shift. The swell backs down, and the wind finally plays nice. Friday the 21st is the first real standout of the period. We’ve got a clean 4ft of swell, but the period jumps to 12 seconds, which brings some proper energy with it. Morning sees a light offshore wind, perfect conditions to make the most of that swell. It's not huge, but it will be clean and fun, breaking with some shape. The energy is moderate (591 units), but the quality will be there. This is your first chance for a good session.
Saturday the 22nd will still have some clean waves, dropping to around 3ft, but it’s getting smaller. By Sunday the 23rd and Monday the 24th, it fades right out to almost nothing. We're talking ankle-biters with energy readings in the 30s and 50s. The ocean basically goes to sleep for a few days there.
The surf stays tiny at the start of the following week. However, there's another blip on the radar for the week after. The period starts to climb again, and we get some clean conditions with small, rideable waves from Friday the 28th through Saturday the 29th. Friday morning looks like the best of that run, with a 2ft swell and a light offshore wind creating clean conditions at 338 units of energy. It's not big, but it’s clean, and after that last blow-out, that might be just what you need.
For the long-range promise, Saturday the 29th holds some potential, but it’s a fair way out, so I wouldn't book the day off work just yet. It's all about quality over quantity this time around. We get a taste of clean conditions, but we have to be patient and pick the right moments. The good news is the spot is fairly consistent, so it shouldn't stay flat for long.
Remember, the crowd factor is always a possibility at this break, so get out there early.
Stay stoked,
Rusty
Short Range ForecastHeavy rain (total 60mm), heaviest during Sun night. Very mild (max 14°C on Sat afternoon, min 9°C on Sun afternoon). Winds increasing (calm on Fri night, near gales from the SW by Sun afternoon). | Days 5-7 Weather SummaryLight rain (total 9mm), mostly falling on Mon afternoon. Very mild (max 11°C on Wed afternoon, min 7°C on Tue morning). Winds decreasing (strong winds from the SSW on Tue afternoon, moderate winds from the SW by Thu morning). | |||||||||||||||||||
Fri 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | ||||||||||||||
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) | E 7 | E 8 | E 9 | E 8 | E 8 | E 8 | S 8 | SSE 10 | SSE 10 | SE 10 | S 10 | S 9 | SSE 10 | S 10 | S 11 | S 11 | S 10 | S 10 | SSE 11 | SSE 12 |
Wave Graph | ||||||||||||||||||||
145 | 476 | 435 | 412 | 316 | 205 | 378 | 1140 | 1522 | 1567 | 2326 | 1894 | 1470 | 3775 | 4037 | 3552 | 2080 | 1818 | 687 | 714 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-on | glassy | cross-on | cross-on | cross-on | on | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-off |
High Tide | 7:19PM2.07m | 7:42AM1.98m | 8:05PM2.10m | 8:30AM2.01m | 8:51PM2.10m | 9:16AM2.02m | 9:37PM2.07m | 10:02AM2.01m | 10:22PM2.02m | 10:47AM1.96m | 11:06PM1.95m | 11:32AM1.90m | 11:48PM1.87m | |||||||
Low Tide | 1:39AM0.49m | 1:48PM0.42m | 2:26AM0.46m | 2:37PM0.43m | 3:10AM0.46m | 3:25PM0.47m | 3:54AM0.48m | 4:11PM0.52m | 4:39AM0.51m | 4:56PM0.58m | 5:24AM0.56m | 5:42PM0.65m | ||||||||
— | — | 6:54 | — | — | 6:52 | — | — | 6:52 | — | — | 6:50 | — | — | 6:48 | — | — | 6:48 | — | — | |
5:29 | — | — | 5:30 | — | — | 5:30 | — | — | 5:31 | — | — | 5:32 | — | — | 5:34 | — | — | 5:34 | — | |
mm | 9 | 7 | 6 | 3 | 4 | 5 | 7 | 17 | 2 | 2 | 3 | 1 | — | — | 2 | 1 | — | — | — | — |
Temp °C | 13 | 13 | 13 | 14 | 13 | 11 | 9 | 11 | 9 | 9 | 8 | 10 | 10 | 10 | 10 | 11 | 11 | 11 | 11 | 9 |
Feels °C | 8 | 8 | 10 | 14 | 11 | 3 | -2 | 2 | -1 | -1 | -1 | 0 | 0 | 0 | 3 | 3 | 4 | 5 | 5 | 6 |
Swell 1 Height (m) Direction Period (s) | ESE 14 | E 8 | E 9 | E 8 | E 8 | E 8 | E 9 | ESE 8 | ESE 8 | E 10 | SE 10 | SE 9 | E 18 | SSE 10 | SSE 11 | SSE 11 | SSE 10 | SSE 10 | SSE 11 | SSE 12 |
20 | 476 | 435 | 412 | 316 | 205 | 190 | 217 | 300 | 138 | 1203 | 899 | 6 | 1552 | 1791 | 1771 | 1042 | 865 | 687 | 714 | |
Swell 2 Height (m) Direction Period (s) | S 16 | S 15 | ESE 13 | S 18 | SSE 18 | SSE 18 | SSE 16 | SSE 19 | ESE 10 | — | SSE 15 | ENE 10 | — | — | — | — | SSE 15 | SE 12 | SE 14 | SE 13 |
5 | 4 | 18 | 6 | 61 | 103 | 87 | 73 | 59 | — | 73 | 31 | — | — | — | — | 434 | 21 | 29 | 25 | |
Swell 3 Height (m) Direction Period (s) | ESE 14 | S 18 | S 15 | ESE 13 | SSW 18 | S 18 | S 16 | S 19 | ESE 10 | — | — | — | — | — | — | — | — | SE 14 | SE 12 | SE 10 |
20 | 6 | 5 | 18 | 61 | 160 | 132 | 66 | 83 | — | — | — | — | — | — | — | — | 29 | 21 | 17 | |
Wind waves Height (m) Direction Period (s) | E 7 | ENE 8 | ENE 9 | — | — | S 6 | S 8 | SSE 10 | SSE 10 | SE 10 | S 10 | S 9 | SSE 10 | S 10 | S 11 | S 11 | S 10 | S 10 | — | — |
145 | 1072 | 1181 | — | — | 89 | 378 | 1140 | 1522 | 1567 | 2326 | 1894 | 1470 | 3775 | 4037 | 3552 | 2080 | 1818 | — | — | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 97 | 97 | 36 | 0 | 10 | 68 | 118 | 118 | 307 | 121 | 68 | 68 | 133 | 115 | 125 | 121 | 68 | 53 | 125 | 0 |
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.











