Surf Forecasts:
Ranches surf forecast from 18 Aug 2026:
- Best quality surf: Tuesday 18 Aug, 2AM (local time) - 2.5ft (0.8m), 6s period, NE swell with offshore winds.
- Most powerful swell: Thursday 20 Aug, 11AM (local time) - 2ft (0.6m), 18s period, SW swell with 249 kJ wave energy.
- Next surfable swell (1★+): Tuesday 18 Aug, 2AM (local time) - 2.5ft (0.8m), 6s period with NE 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 Tuesday (Aug 18) at 2AM. The primary swell is predicted to be 0.8m and 6s period. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Ranches in the next 16 days are 0.6m 18s and forecast to arrive on Thursday (Aug 20) at 11AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 6s period and expected on Saturday (Aug 22) at 11PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Tue 18th Aug) | 2.5ft (0.8m) 6s |
| Best Surf | 2AM (Tue 18th Aug) | 2.5ft (0.8m) 6s |
| Most Powerful | 11AM (Thu 20th Aug) | 2ft (0.6m) 18s |
Table - best surf conditions forecast for Ranches over the next 16 days.
The Lowdown
Alright, Rusty here. Let me tell you what’s cooking.
Honestly, the next couple of weeks aren’t looking like a surfing bonanza for us. There’s a big blank patch starting now, and we’re not getting anything worth paddling out for until Wednesday morning, August 19th. From then on, it’s mostly a run of very ordinary, small stuff. There’s no real standout, high-quality swell heading our way, so you gotta keep your expectations low.
August 19th (Wednesday) – This is the most interesting session in the whole outlook, but it’s still a strange one. Ranches is a reef setup that’s exposed to the NW, and we get a tiny 2 ft swell coming from the SW, which is the complete opposite of the optimum direction. The real story here is the period: a massive 16 seconds, making it a very long period groundswell. This kind of energy is weird for a beach, but on a reef, it could wrap in and produce some clean, lined-up waves. The combined energy is moderate (157). The wind is dead calm, glassy as a lake in the morning, and that will make for a slick, clean surface. The wave is tiny, though, so it’s really only for a longboard and someone who knows the reef. A crowd could show up since it’s sometimes busy here, but on waves this small, it’s unlikely.
August 20th (Thursday) – A bit of a letdown after the glassy morning. Thursday morning offers a 2 ft swell from the SW again, with a very long period of 18 seconds, giving us a decent 277 (moderate) energy. Problem is the wind is a cross-shore from the NNW at 6 mph, putting little ripples on the face. The morning is marginal. Thursday afternoon cleans up with light offshore wind from the east, but the swell drops to a 2 ft from the NNE and the period collapses to 7 seconds. It’s surfable but ordinary.
August 21st (Friday) through August 25th (Tuesday) – A long, flat spell of tiny surf and moderate to fresh offshore winds. We see consistent offshore breezes from the ENE and NE, but the swell hovers around 1 ft to 2 ft with periods mostly under 8 seconds. The energy is weak, scraping the bottom of the scale (between 35 and 175). This is the definition of “surfable but very ordinary.” It would take a longboard or a foiler to have any fun. The water temperature feels about average for this time of year.
August 26th (Wednesday) and 27th (Thursday) – Still small. Slight bump where the swell climbs to 4 ft – 4 ft from the NE, but the period is still short at 6-7 seconds. Combined energy stays moderate (95–149). Offshore winds keep it clean, but without any power or push, it’s just lumpy, weak waves. Another stretch of “meh.”
August 28th (Friday) – A total flat day. Zero energy. No swell at all. Don’t bother heading down.
August 29th (Saturday) to September 2nd (Wednesday) – We limp to the end with tiny, weak swell from the NE. 1 ft to 3 ft, period never over 7 seconds. Combined energy is very weak (14–58). Offshore winds are a constant feature, keeping the surface clean, but there’s just no wave face to ride. For the last few days there’s no swell recorded at all.
Bottom line: The 19th is the only real point of interest, and that’s because the long period and glassy conditions could make it a weird, fun novelty wave on the reef. For everyone else, it’s a longboard-only, very ordinary window. This area tends to have quiet runs like this, but it won’t stay this way forever.
Rusty.
Short Range ForecastMostly dry. Warm (max 28°C on Thu afternoon, min 24°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 29°C on Sat afternoon, min 24°C on Thu night). Wind will be generally light. | ||||||||||||||||||
Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | ||||||||||||||
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) | NE 6 | NE 6 | NE 6 | WNW 12 | SW 16 | NNE 6 | NNE 6 | SW 18 | NNE 7 | NE 7 | NNE 7 | W 10 | W 10 | W 10 | WNW 13 | WNW 12 | NW 11 | NW 11 | NW 10 |
Wave Graph | |||||||||||||||||||
47 | 28 | 32 | 28 | 129 | 26 | 24 | 249 | 29 | 38 | 35 | 49 | 49 | 52 | 62 | 121 | 99 | 94 | 54 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | glassy | off | off | glassy | glassy | off | cross | off | off | cross-on | glassy | off | glassy | off | off | off | off | off |
High Tide | 9:19AM0.48m | 7:36PM0.27m | 10:33AM0.50m | 11:45AM0.53m | 10:31PM0.18m | 12:45PM0.56m | 00:28AM0.18m | 1:32PM0.60m | 1:26AM0.20m | 2:12PM0.62m | 2:06AM0.23m | ||||||||
Low Tide | 1:45AM0.08m | 4:14PM0.27m | 2:19AM0.10m | 3:05AM0.12m | 8:45PM0.20m | 8:59PM0.17m | 5:24AM0.12m | 9:18PM0.16m | 6:26AM0.10m | 9:36PM0.14m | |||||||||
— | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | |
7:00 | — | 7:00 | — | — | 7:00 | — | — | 6:59 | — | — | 6:58 | — | — | 6:58 | — | — | 6:57 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 26 | 27 | 25 | 26 | 26 | 25 | 27 | 28 | 26 | 26 | 27 | 26 | 28 | 29 | 26 | 27 | 28 | 26 |
Feels °C | 27 | 28 | 29 | 24 | 29 | 28 | 27 | 29 | 30 | 29 | 29 | 30 | 30 | 30 | 30 | 27 | 27 | 27 | 26 |
Swell 1 Height (m) Direction Period (s) | S 13 | S 13 | S 13 | S 13 | NNE 6 | NNE 6 | SSW 16 | SW 18 | SSW 17 | SW 16 | SW 17 | SW 16 | SSW 16 | SSW 16 | SW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 14 |
225 | 165 | 162 | 155 | 28 | 26 | 175 | 249 | 200 | 278 | 291 | 261 | 322 | 326 | 255 | 212 | 201 | 191 | 186 | |
Swell 2 Height (m) Direction Period (s) | NE 6 | NE 6 | NE 6 | SW 18 | S 12 | S 12 | NNE 6 | NNE 6 | NNE 7 | NE 7 | NNE 7 | NNE 7 | NE 7 | NE 6 | WNW 13 | WNW 12 | NW 11 | NW 11 | SSE 13 |
47 | 28 | 32 | 79 | 103 | 69 | 24 | 28 | 29 | 38 | 31 | 31 | 36 | 42 | 62 | 121 | 99 | 94 | 98 | |
Swell 3 Height (m) Direction Period (s) | S 5 | SSW 17 | SSW 18 | WNW 12 | SW 16 | SSW 16 | S 12 | S 11 | S 11 | S 11 | W 10 | W 10 | W 10 | W 10 | WNW 10 | SSE 12 | SSE 13 | SE 7 | NW 10 |
4 | 115 | 123 | 28 | 129 | 100 | 45 | 39 | 39 | 22 | 35 | 49 | 49 | 52 | 34 | 50 | 101 | 14 | 54 | |
Wind waves Height (m) Direction Period (s) | — | — | — | NE 5 | — | — | — | — | — | — | — | — | — | — | ENE 6 | ENE 6 | NE 6 | NE 6 | ENE 6 |
— | — | — | 17 | — | — | — | — | — | — | — | — | — | — | 52 | 88 | 76 | 62 | 94 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 2 | 2 | 2 | 0 | 2 | 2 | 2 | 2 | 2 | 16 | 0 | 0 | 0 | 0 | 0 | 0 | 154 | 0 |
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.











