Surf Forecasts:
Big Beach surf forecast from 18 Aug 2026:
- Best quality surf: Friday 21 Aug, 2AM (local time) - 2.5ft (0.7m), 16s period, SW swell with offshore winds.
- Most powerful swell: Friday 21 Aug, 8AM (local time) - 2.5ft (0.7m), 17s period, SW swell with 298 kJ wave energy.
- Next surfable swell (1★+): Tuesday 18 Aug, 5AM (local time) - 2.5ft (0.7m), 13s period with S swell.
Best Forecast Surf Conditions for Big Beach this week:
The surf forecast for Big Beach over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Tuesday (Aug 18) at 5AM. The primary swell is predicted to be 0.7m and 13s period with a secondary swell of 0.2m and 11s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Big Beach in the next 16 days are 0.7m 17s and forecast to arrive on Friday (Aug 21) at 8AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 3.0m 7s period and expected on Monday (Aug 24) at 5PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Tue 18th Aug) | 2.5ft (0.7m) 13s |
| Best Surf | 2AM (Fri 21st Aug) | 2.5ft (0.7m) 16s |
| Most Powerful | 8AM (Fri 21st Aug) | 2.5ft (0.7m) 17s |
Table - best surf conditions forecast for Big Beach over the next 16 days.
The Lowdown
This is Rusty, and here’s the look at Big Beach for the next couple weeks.
We’re looking at a lean period, especially for a beach that usually offers more. There’s a little clean run to start this week, then a long dry spell of borderline flat days in the middle. The second week shows a better pulse, but nothing giant.
Tuesday, August 18th kicks off with tiny surf – 2ft from the S with a 13-second period, light cross-offshore breeze. The water temp is pretty average for this time of year. Not exciting, but clean. Afternoon stays 2ft with a fresh offshore wind. Wednesday 19th is even smaller at around 2ft. The real standout for this early run is Thursday, August 20th. The morning is dead calm – glassy flat calm – with that 2ft SSW groundswell pushing in on a very long 18-second period. Those waves will be clean and lined up. Not big, but perfect conditions for small boards. The afternoon stays glassy too. Friday 21st morning is also clean with 2ft SW groundswell (16 seconds) and cross-off breeze.
Things turn south from Saturday 22nd afternoon. For a good stretch, maybe five days from that point, the swell is super weak – mostly 2ft to 2ft – with moderate cross-off or stronger winds and “poor” conditions. The combined energy drops and stays weak. The magic shows up on Thursday, August 27th. The swell gets to a consistent 3ft from the S (16 seconds) with clean offshore ENE winds all day. The energy is solid – hitting the high hundreds. It’s not big enough to scare anyone, and with those clean offshores, it’s the best chance for a fun session in the whole forecast. Crowds can happen sometimes, so early is better. Friday 28th morning is okay with 3ft and offshores.
From Saturday 29th, it’s back to small and weak. Sunday 30th morning has a 2ft S swell (12 seconds) with a gentle cross-off – decent for a quiet morning. Monday 31st the period drops to a short 9 seconds on a SW swell, which is bad energy. By Wednesday, September 2nd, we’re down to 2ft WNW with a light offshore – barely a ripple.
Best bets: Thursday 20th for the glassy conditions and long period groundswell, and Thursday 27th for the best combination of size, clean wind, and solid energy.
Rusty.
Short Range ForecastMostly dry. Warm (max 27°C on Tue afternoon, min 24°C on Tue night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 29°C on Fri afternoon, min 25°C on Sat night). Wind will be generally light. | ||||||||||||||||||||
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) | S 13 | S 13 | SW 18 | SSW 16 | SW 16 | SW 16 | SSW 18 | SSW 17 | SW 16 | SW 16 | SW 16 | SW 16 | SSW 15 | SW 15 | SSW 15 | SSW 15 | SSW 16 | SW 14 | SSW 14 | SSW 13 | SSW 13 |
Wave Graph  | |||||||||||||||||||||
 kJ | 123 | 119 | 82 | 103 | 71 | 129 | 207 | 202 | 278 | 219 | 119 | 261 | 152 | 116 | 152 | 144 | 137 | 100 | 104 | 101 | 125 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | off | off | off | off | glassy | glassy | off | cross-off | cross-off | off | cross-off | cross-off | off | cross-off | off | off | cross-off | cross-off | off |
High Tide | 8:09AM0.40m | 5:51PM0.38m | 10:09AM0.39m | 12:36PM0.42m | 1:29PM0.46m | 2:01PM0.50m | 11:48PM0.23m | 2:28PM0.53m | 1:03AM0.27m | 2:51PM0.56m | 1:46AM0.30m | ||||||||||
Low Tide | 1:00PM0.23m | 1:08AM0.06m | 1:51AM0.07m | 3:14AM0.08m | 5:09AM0.07m | 9:42PM0.17m | 6:20AM0.05m | 9:13PM0.16m | 7:07AM0.02m | 9:16PM0.15m | |||||||||||
 | |  | | |  |  | | | | | | | | | | | | | | | |
 | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — |
 | — | 6:52 | — | — | 6:52 | — | — | 6:51 | — | — | 6:50 | — | — | 6:50 | — | — | 6:49 | — | — | 6:47 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 27 | 25 | 27 | 27 | 25 | 27 | 27 | 26 | 27 | 29 | 28 | 28 | 29 | 27 | 28 | 28 | 26 | 27 | 28 | 26 |
Feels °C | 28 | 28 | 26 | 30 | 29 | 26 | 32 | 32 | 30 | 30 | 31 | 31 | 31 | 30 | 27 | 27 | 28 | 26 | 26 | 27 | 25 |
Swell 1 Height (m) Direction Period (s) | E 8 | S 13 | S 13 | E 8 | S 12 | SW 16 | E 8 | E 7 | SW 16 | SW 16 | E 6 | SW 16 | SSW 15 | SW 15 | SSW 15 | SSW 15 | SSW 16 | SW 14 | SSW 14 | SSW 13 | SSW 13 |
| kJ | 63 | 119 | 82 | 107 | 71 | 129 | 54 | 40 | 278 | 219 | 39 | 261 | 152 | 116 | 152 | 144 | 137 | 100 | 104 | 101 | 125 |
Swell 2 Height (m) Direction Period (s) | S 13 | SW 18 | SW 18 | S 12 | SW 16 | S 12 | SSW 18 | SSW 17 | E 7 | S 11 | SW 16 | S 13 | S 12 | WNW 10 | S 12 | SSW 16 | SW 14 | SSW 15 | SSE 12 | SSE 12 | S 10 |
| kJ | 123 | 79 | 79 | 69 | 65 | 45 | 207 | 202 | 38 | 37 | 119 | 84 | 48 | 34 | 25 | 51 | 33 | 71 | 49 | 45 | 50 |
Swell 3 Height (m) Direction Period (s) | SW 17 | W 13 | W 12 | SSW 16 | SW 19 | W 11 | S 12 | S 11 | S 11 | W 10 | W 10 | WNW 10 | WNW 10 | S 12 | WNW 10 | S 12 | S 11 | SSE 13 | SSW 18 | SSW 18 | SSW 16 |
| kJ | 74 | 14 | 26 | 103 | 56 | 10 | 24 | 21 | 37 | 18 | 31 | 34 | 37 | 46 | 19 | 23 | 22 | 33 | 32 | 61 | 91 |
Wind waves Height (m) Direction Period (s) | E 4 | E 9 | E 8 | E 8 | E 8 | E 8 | — | — | NE 7 | E 6 | E 7 | E 6 | E 6 | E 7 | E 6 | E 6 | E 6 | E 6 | E 7 | E 7 | E 7 |
| kJ | 19 | 120 | 138 | 161 | 104 | 119 | — | — | 55 | 49 | 89 | 157 | 187 | 414 | 301 | 301 | 333 | 256 | 480 | 820 | 573 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Best forecast wave conditions in Maui | |||||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||||
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The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Big Beach 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 Big Beach Surf forecast
The above surf forecast table for Big Beach provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Big Beach can be found by selecting the local surf guide option on the grey menu. Our Big Beach 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 (Big Beach) 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 Big Beach 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 vacation in Maui? If you are looking for accommodation near Big Beach, camping, hotels and condos and appartments in Maui, consider staying in Kihei which is 17 km (11 miles) away. Other places in and around Maui where you can find information about places to rent, and car hire include Wailuku which is 28 km (17 miles) away, Kahului, Lanai - Lanai and Kaunakakai - Molokai.
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