Surf Forecasts:
Kai-Iwi surf forecast from 18 Aug 2026:
- Best quality surf: Sunday 23 Aug, 9AM (local time) - 11ft (3.5m), 9s period, W swell with cross-shore winds.
- Most powerful swell: Wednesday 19 Aug, 12AM (local time) - 13ft (4.0m), 10s period, S swell with 3,185 kJ wave energy.
- Next surfable swell (1★+): Thursday 20 Aug, 3AM (local time) - 2.5ft (0.7m), 15s period with WSW swell.
Best Forecast Surf Conditions for Kai-Iwi this week:
The surf forecast for Kai-Iwi over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Aug 20) at 3AM. The primary swell is predicted to be 0.7m and 15s period with a secondary swell of 0.7m and 13s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Kai-Iwi in the next 16 days are 4.0m 10s and forecast to arrive on Wednesday (Aug 19) at 12AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 6s period and expected on Saturday (Aug 22) at 9PM.
| Wave Type | Time (NZST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Thu 20th Aug) | 2.5ft (0.7m) 15s |
| Best Surf | 9AM (Sun 23rd Aug) | 11ft (3.5m) 9s |
| Most Powerful | 12AM (Wed 19th Aug) | 13ft (4.0m) 10s |
Table - best surf conditions forecast for Kai-Iwi over the next 16 days.
Short Range ForecastSome drizzle, heaviest during Tue afternoon. Very mild (max 12°C on Thu morning, min 7°C on Tue night). Winds decreasing (strong winds from the S on Tue night, calm by Wed night). | Days 4-6 Weather SummaryModerate rain (total 14mm), heaviest on Sat night. Very mild (max 15°C on Sat afternoon, min 9°C on Fri night). Winds increasing (light winds from the NNW on Fri morning, fresh winds from the WNW by Sun afternoon). | ||||||||||||||||||||
Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | |||||||||||||||
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) | SW 14 | S 6 | S 10 | S 9 | S 11 | WSW 15 | SW 14 | SW 14 | SW 14 | SW 13 | SW 16 | W 6 | W 6 | W 6 | WNW 7 | W 9 | W 9 | W 8 | SW 16 | W 8 | W 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 50 | 64 | 3185 | 971 | 418 | 270 | 103 | 102 | 50 | 48 | 76 | 170 | 240 | 221 | 458 | 1730 | 1764 | 1071 | 573 | 653 | 478 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross-on | cross-on | cross-on | on | cross-off | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross-off | cross | cross | cross | cross | cross | cross-off |
High Tide | 1:54PM2.53m | 2:10AM2.48m | 2:35PM2.41m | 2:55AM2.34m | 3:25PM2.29m | 3:55AM2.21m | 4:34PM2.20m | 5:14AM2.15m | 6:05PM2.19m | 6:35AM2.16m | 7:17PM2.26m | 7:40AM2.24m | 8:09PM2.37m | ||||||||
Low Tide | 8:10PM0.99m | 8:32AM0.98m | 8:55PM1.14m | 9:15AM1.12m | 9:49PM1.27m | 10:10AM1.24m | 10:58PM1.35m | 11:28AM1.31m | 00:26AM1.35m | 12:55PM1.28m | 1:38AM1.27m | 1:58PM1.18m | 2:28AM1.15m | ||||||||
 |  |  | | | | | |  | | | | | |  | |  | | |  | | |
 | 7:05 | — | — | 7:03 | — | — | 7:01 | — | — | 7:00 | — | — | 6:58 | — | — | 6:58 | — | — | 6:56 | — | — |
 | — | 5:43 | — | — | 5:44 | — | — | 5:45 | — | — | 5:45 | — | — | 5:46 | — | — | 5:47 | — | — | 5:49 | — |
mm | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | 12 | 2 | — | — | — | — | — |
Temp °C | 11 | 10 | 9 | 9 | 10 | 10 | 12 | 12 | 11 | 13 | 14 | 10 | 14 | 15 | 13 | 14 | 14 | 12 | 14 | 14 | 12 |
Feels °C | 6 | 6 | 0 | 5 | 6 | 7 | 9 | 9 | 8 | 9 | 10 | 6 | 9 | 10 | 8 | 8 | 7 | 6 | 8 | 8 | 7 |
Swell 1 Height (m) Direction Period (s) | W 8 | W 8 | W 13 | WSW 12 | S 9 | SSW 13 | S 11 | SW 14 | SSW 9 | SSW 12 | SW 16 | SW 14 | S 11 | SW 13 | WSW 13 | S 10 | WSW 18 | WSW 17 | SW 16 | WSW 15 | W 7 |
| kJ | 34 | 63 | 115 | 138 | 225 | 236 | 62 | 102 | 25 | 48 | 61 | 53 | 21 | 28 | 17 | 2 | 31 | 195 | 573 | 403 | 333 |
Swell 2 Height (m) Direction Period (s) | SW 14 | S 8 | — | SW 17 | WSW 16 | WSW 15 | SW 14 | S 9 | SW 14 | SW 13 | SSW 13 | SSW 12 | SW 14 | S 11 | S 10 | — | WSW 15 | S 9 | SSW 9 | S 15 | SW 15 |
| kJ | 50 | 30 | — | 75 | 322 | 270 | 103 | 24 | 50 | 45 | 57 | 27 | 33 | 9 | 9 | — | 21 | 2 | 29 | 17 | 314 |
Swell 3 Height (m) Direction Period (s) | W 18 | SW 14 | — | W 13 | S 14 | SW 16 | WSW 9 | SSW 11 | WSW 9 | WSW 16 | SW 16 | WSW 14 | S 11 | W 19 | WSW 19 | — | — | — | — | S 9 | SSW 15 |
| kJ | 6 | 46 | — | 82 | 101 | 62 | 26 | 13 | 8 | 26 | 39 | 20 | 9 | 7 | 36 | — | — | — | — | 6 | 21 |
Wind waves Height (m) Direction Period (s) | S 4 | S 6 | S 10 | S 9 | S 11 | S 11 | — | W 5 | W 5 | W 5 | W 5 | W 6 | W 6 | W 6 | WNW 7 | W 9 | W 9 | W 8 | W 8 | W 8 | W 7 |
| kJ | 37 | 64 | 3185 | 971 | 418 | 110 | — | 23 | 20 | 40 | 76 | 170 | 240 | 221 | 458 | 1730 | 1764 | 1071 | 535 | 653 | 478 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 96 | 118 | 118 | 11 | 118 | 61 | 0 | 13 | 0 | 0 | 150 | 13 | 13 | 177 | 177 | 177 | 179 | 160 | 160 | 156 | 13 |
Best forecast wave conditions in Wanganui and the Manawatu | |||||||||||||||||||||
Best forecast wave conditions in New Zealand | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Kai-Iwi surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
Information about the Kai-Iwi Surf forecast
The above surf forecast table for Kai-Iwi provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Kai-Iwi can be found by selecting the local surf guide option on the grey menu. Our Kai-Iwi 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 (Kai-Iwi) 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 Kai-Iwi 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 Wanganui and the Manawatu? If you are looking for accommodation near Kai-Iwi, camping, hotels and holiday cottages in Wanganui and the Manawatu, consider staying in Wanganui which is 12 km (7 miles) away. Other places in and around Wanganui and the Manawatu where you can find information about places to rent, and car hire include Palmerston North which is 78 km (48 miles) away and Levin, 87 km (54 miles) away.
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