Surf Forecasts:
Ranches surf forecast from 21 Aug 2026:
- Best quality surf: Friday 21 Aug, 5AM (local time) - 2.5ft (0.7m), 7s period, NNE swell with cross-offshore winds.
- Most powerful swell: Sunday 23 Aug, 2AM (local time) - 2.5ft (0.8m), 12s period, WNW swell with 169 kJ wave energy.
- Next surfable swell (1★+): Friday 21 Aug, 5AM (local time) - 2.5ft (0.7m), 7s period with NNE swell.
Best Forecast Surf Conditions for Ranches this week:
The surf forecast for Ranches over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Friday (Aug 21) at 5AM. The primary swell is predicted to be 0.7m and 7s period. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Ranches in the next 16 days are 0.8m 12s and forecast to arrive on Sunday (Aug 23) at 2AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 17s period and expected on Thursday (Aug 27) at 2PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Fri 21st Aug) | 2.5ft (0.7m) 7s |
| Best Surf | 5AM (Fri 21st Aug) | 2.5ft (0.7m) 7s |
| Most Powerful | 2AM (Sun 23rd Aug) | 2.5ft (0.8m) 12s |
Table - best surf conditions forecast for Ranches over the next 16 days.
The Lowdown
Alright, folks, Rusty here, and I’m looking at a tough stretch for Ranches. The first week is mostly a bust, with nothing but tiny, weak waves. The real action is at the tail end of the forecast, around the 30th of August into early September.
We start Friday the 21st of August with nothing. The water’s flat, a bit of a slick, but no surf. This carries on through the weekend and into the new week. The swell is tiny, around 2ft to 2ft, from the west and west-northwest, with a period of 10 to 12 seconds. The wave energy is weak (98 down to 57). The wind is offshore from the ENE, keeping the surface clean, but the waves are just too small to bother with.
Then we hit a real dead zone from the 25th to the 28th of August. The swell all but vanishes, with energy dropping to zero or near zero. It’s glassy in the mornings, but there’s nothing to ride. The 28th afternoon sees a bump to 3ft, but it’s a short-period 6-second windswell from the northeast, which is messy. The 29th is a bit bigger, 3ft, but still that short, weak period. The wind is strong offshore, but it’s making for poor surf.
Now, here’s the standout. The morning of Sunday the 30th of August finally delivers. We get a long-period groundswell from the southwest, 2ft at 16 seconds, but the combined energy is 210 (moderate). The wind is moderate offshore from the ENE, so it’ll be clean. This is a classic, long-period swell that will wrap into the reef at Ranches, drawing out nicely. The 31st of August morning is similar, with 2ft at 15 seconds from the southwest and energy of 203. These two sessions are the best on offer, but don’t expect big waves; it’s about shape and quality. For the 31st afternoon, the wind picks up fresh from the NE, making it messy.
After that, the 1st of September turns ugly with a strong, fresh northeasterly wind and a messy, short-period swell. The water is about average for this time of year.
The real sleeper is the afternoon of the 3rd of September. The wind goes glassy, flat calm, with a 4ft swell from the north-northeast at 10 seconds and a massive 401 energy reading. That’s going to be smooth, clean, and lined up. That’s your expert session, as the size is over 4ft, so it’s not for beginners. The 4th of September is smaller, around 3ft, with clean conditions but less energy.
The first week is a washout. The best, most promising surf is the morning of the 30th and 31st of August, and the glassy afternoon of the 3rd of September. Keep your eye on those dates.
Rusty.
Short Range ForecastMostly dry. Warm (max 29°C on Sat afternoon, min 26°C on Thu night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 29°C on Mon afternoon, min 25°C on Tue night). Wind will be generally light. | ||||||||||||||||||
Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | ||||||||||||||
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) | NNE 7 | W 11 | W 10 | W 10 | W 10 | W 11 | WNW 12 | WNW 11 | WNW 12 | WNW 11 | WNW 12 | NW 11 | NW 10 | SSW 16 | SSW 16 | SSW 15 | NW 10 | NW 10 | S 17 |
Wave Graph | |||||||||||||||||||
42 | 56 | 49 | 50 | 51 | 57 | 169 | 81 | 91 | 85 | 93 | 59 | 27 | 0 | 0 | 0 | 28 | 28 | 0 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | cross | cross-off | off | off | off | off | off | off | off | off | off | off | off | off | off | off | off |
High Tide | 10:31PM0.18m | 12:45PM0.56m | 00:28AM0.18m | 1:32PM0.60m | 1:26AM0.20m | 2:12PM0.62m | 2:06AM0.23m | 2:46PM0.64m | 2:41AM0.26m | 3:16PM0.65m | 3:15AM0.30m | 3:44PM0.65m | 3:51AM0.34m | ||||||
Low Tide | 8:45PM0.20m | 8:59PM0.17m | 5:24AM0.12m | 9:18PM0.16m | 6:26AM0.10m | 9:36PM0.14m | 7:17AM0.08m | 9:53PM0.13m | 8:01AM0.06m | 10:11PM0.11m | 8:42AM0.05m | 10:30PM0.10m | |||||||
— | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | |
6:59 | — | 6:58 | — | — | 6:58 | — | — | 6:57 | — | — | 6:55 | — | — | 6:54 | — | — | 6:53 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 27 | 27 | 27 | 28 | 28 | 29 | 26 | 27 | 28 | 26 | 27 | 29 | 26 | 28 | 29 | 26 | 27 | 27 | 25 |
Feels °C | 30 | 31 | 30 | 31 | 30 | 31 | 28 | 27 | 28 | 27 | 28 | 29 | 27 | 30 | 29 | 26 | 27 | 25 | 25 |
Swell 1 Height (m) Direction Period (s) | SW 16 | SW 17 | SW 16 | SSW 16 | SSW 16 | SW 16 | WNW 12 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | SSW 12 | SSW 16 | SSW 15 | SSW 14 | S 18 | S 17 |
278 | 291 | 261 | 322 | 326 | 255 | 169 | 201 | 191 | 186 | 166 | 156 | 125 | 119 | 196 | 121 | 215 | 304 | 277 | |
Swell 2 Height (m) Direction Period (s) | NNE 7 | NNE 7 | NNE 7 | NE 7 | NE 6 | W 11 | SW 16 | WNW 11 | WNW 12 | WNW 11 | WNW 12 | NW 11 | SSW 17 | SSE 13 | SSW 12 | SSW 12 | S 18 | SSW 13 | SSW 13 |
42 | 42 | 32 | 36 | 34 | 57 | 245 | 81 | 91 | 85 | 93 | 59 | 93 | 93 | 81 | 79 | 165 | 133 | 135 | |
Swell 3 Height (m) Direction Period (s) | W 9 | W 11 | W 10 | W 10 | W 10 | SSE 12 | SSE 12 | SSE 13 | SSE 11 | SSE 13 | SSE 12 | SSE 12 | NW 10 | SSW 16 | SSE 12 | SSE 9 | NW 10 | NW 10 | S 20 |
42 | 56 | 49 | 50 | 51 | 50 | 50 | 101 | 43 | 95 | 86 | 48 | 27 | 147 | 75 | 33 | 28 | 28 | 194 | |
Wind waves Height (m) Direction Period (s) | — | — | — | ENE 7 | — | ENE 6 | ENE 7 | ENE 6 | ENE 6 | NE 6 | NE 6 | NE 6 | NE 6 | NE 6 | NE 6 | NE 7 | NE 5 | NE 5 | ENE 6 |
— | — | — | 45 | — | 52 | 82 | 88 | 67 | 31 | 46 | 46 | 31 | 32 | 38 | 44 | 32 | 25 | 27 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 3 | 3 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 2 | 6 | 2 | 2 | 2 | 2 |
Best forecast wave conditions in Oahu | |||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||
Header Global | |||||||||||||||||||
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Information about the Ranches Surf forecast
The above surf forecast table for Ranches provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Ranches can be found by selecting the local surf guide option on the grey menu. Our Ranches 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 (Ranches) 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 Ranches 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.
Ranches is 22 km (14 miles) from Wahiawa. If you plan a vacation in Oahu, look for hotels and other accommodation in Wahiawa. Wahiawa has rooms for a wide range of budgets as well as car hire and transport links.











