Surf Forecasts:
Waimanalo surf forecast from 3 Sep 2026:
- Best quality surf: Tuesday 8 Sep, 5PM (local time) - 4.5ft (1.3m), 9s period, ENE swell with cross-offshore winds.
- Most powerful swell: Monday 7 Sep, 8AM (local time) - 8ft (2.5m), 13s period, E swell with 2,252 kJ wave energy.
- Next surfable swell (1★+): Tuesday 8 Sep, 5PM (local time) - 4.5ft (1.3m), 9s period with ENE swell.
Best Forecast Surf Conditions for Waimanalo this week:
The surf forecast for Waimanalo over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Tuesday (Sep 08) at 5PM. The primary swell is predicted to be 1.3m and 9s period. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Waimanalo in the next 16 days are 2.5m 13s and forecast to arrive on Monday (Sep 07) at 8AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 3.5m 12s period and expected on Monday (Sep 07) at 11PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5PM (Tue 8th Sep) | 4.5ft (1.3m) 9s |
| Best Surf | 5PM (Tue 8th Sep) | 4.5ft (1.3m) 9s |
| Most Powerful | 8AM (Mon 7th Sep) | 8ft (2.5m) 13s |
Table - best surf conditions forecast for Waimanalo over the next 16 days.
The Lowdown
Thursday 3rd September to Sunday 6th September – Forget it. We’re looking at onshore ENE winds gusting 40 km/h, with waves around 2.0m to 2.4m. The swell energy is moderate to strong (561 to 1711), but it’s all short-period, bumpy, and blown out. The wind is a mess. Not a single decent wave in this block.
Monday 7th September – The swell jumps up to 3.0m, but the wind is awful – cross-shore from the SE at 40 km/h. That’s just a washing machine. Surf energy is very high (1886), but it’s for experts only, and even then it’s ugly. This is more of a kite-surfing setup than a paddle-surfing one.
Tuesday 8th September – Finally, a glimmer. The wind swings light from the S, 15 km/h, cross-offshore. The swell drops to 1.3m from the ENE, with a period of 9 seconds. The surf energy is moderate (353). The afternoon looks clean. This is the best window in the whole 16-day run. It’s not a standout in the classic sense, but it’s the only time the conditions line up. Expect a few clean, waist-high waves. The break is exposed to the ENE swell, but with the wind light and offshore, it’ll be glassy. Keep in mind the optimum swell direction is from the NE, so this ENE swell might not be perfectly groomed, but it’s still the best we’ve got. Crowds are *sometimes* an issue here, so you might have a few others with the same idea.
Wednesday 9th September to Thursday 10th September – Wind back onshore, swell drops to 0.7m-1.3m. Poor again.
Friday 11th September to Monday 14th September – A bit of a bump in size, with 1.9m to 2.5m swell, but the wind is still onshore or cross-onshore. The morning of Monday 14th has a light ENE breeze at 5 km/h, so the surface might be okay, but the swell is short-period (8 seconds) and the energy is moderate (731). Still marginal. For the most part, this is a write-off.
Tuesday 15th September to Thursday 17th September – More of the same. Onshore winds, 1.4m to 2.2m swell, poor conditions. The 17th afternoon sees a 0.9m wave from the ESE with a 12-second period, which is a longer period, but the wind is onshore, so it’s not going to be clean.
Friday 18th September – The last day. A small 1.0m-1.1m swell from the E, with a long 12-second period. The wind is light from the E at 15 km/h, cross-onshore, so it’s going to be fairly choppy. Marginal at best.
Short Range ForecastSome drizzle, heaviest during Sat night. Warm (max 26°C on Sat morning, min 25°C on Thu morning). Mainly strong winds. | Days 4-6 Weather SummaryHeavy rain (total 35mm), heaviest during Sun afternoon. Warm (max 28°C on Tue afternoon, min 24°C on Sun night). Winds decreasing (near gales from the SSE on Mon night, calm by Tue night). | ||||||||||||||||||||
Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | |||||||||||||||
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) | ENE 7 | ENE 7 | ENE 7 | E 14 | E 14 | ENE 14 | E 13 | ENE 13 | ENE 13 | ENE 12 | ENE 12 | ENE 12 | E 7 | ESE 8 | ENE 12 | ENE 11 | ENE 9 | E 14 | E 14 | ENE 8 | ENE 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 440 | 456 | 392 | 392 | 485 | 2012 | 690 | 1679 | 1930 | 1703 | 1676 | 1676 | 856 | 1008 | 966 | 511 | 272 | 195 | 184 | 196 | 193 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | on | on | on | cross-on | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross-off | cross-off | cross-off | glassy | cross-on | on | on |
High Tide | 9:02AM0.54m | 10:54AM0.59m | 11:56AM0.64m | 12:39PM0.68m | 11:21PM0.29m | 1:14PM0.70m | 00:23AM0.35m | 1:44PM0.70m | 1:12AM0.41m | 2:10PM0.68m | 1:57AM0.46m | ||||||||||
Low Tide | 1:10AM0.03m | 2:48AM0.04m | 4:19AM0.02m | 8:00PM0.22m | 5:27AM-0.01m | 7:55PM0.20m | 6:20AM-0.02m | 8:07PM0.17m | 7:05AM-0.01m | 8:24PM0.14m | |||||||||||
 |  |  | | | | | |  |  |  |  | | |  | | | | | | | |
 | 6:13 | — | — | 6:15 | — | — | 6:15 | — | — | 6:15 | — | — | 6:15 | — | — | 6:15 | — | — | 6:16 | — | — |
 | — | 6:45 | — | — | 6:44 | — | — | 6:43 | — | — | 6:42 | — | — | 6:40 | — | — | 6:39 | — | — | 6:38 | — |
mm | — | — | — | — | — | — | — | — | 1 | 3 | 7 | 11 | 2 | 3 | 8 | 1 | — | — | 2 | — | — |
Temp °C | 25 | 25 | 25 | 25 | 25 | 25 | 26 | 26 | 26 | 26 | 26 | 25 | 26 | 27 | 27 | 27 | 28 | 27 | 27 | 26 | 26 |
Feels °C | 22 | 21 | 21 | 21 | 21 | 21 | 25 | 25 | 26 | 26 | 26 | 23 | 25 | 27 | 23 | 27 | 30 | 31 | 30 | 26 | 25 |
Swell 1 Height (m) Direction Period (s) | E 13 | E 12 | E 14 | E 14 | E 14 | S 12 | E 13 | S 12 | S 12 | SSW 12 | SSW 13 | SSW 14 | SSW 15 | SSW 15 | ENE 12 | ENE 11 | ENE 9 | ENE 8 | ENE 8 | NW 10 | E 13 |
| kJ | 121 | 107 | 264 | 357 | 485 | 96 | 690 | 129 | 137 | 198 | 195 | 356 | 678 | 1624 | 966 | 511 | 272 | 173 | 142 | 98 | 173 |
Swell 2 Height (m) Direction Period (s) | SSE 12 | SSE 12 | S 12 | S 12 | S 12 | S 13 | S 12 | NNE 10 | NNE 8 | SSE 10 | SSE 10 | NW 16 | NW 15 | ENE 13 | SSW 16 | S 9 | S 9 | E 14 | NW 10 | E 14 | NNW 10 |
| kJ | 59 | 85 | 108 | 146 | 139 | 31 | 134 | 32 | 20 | 10 | 18 | 10 | 8 | 860 | 85 | 207 | 104 | 195 | 137 | 179 | 61 |
Swell 3 Height (m) Direction Period (s) | S 14 | S 14 | NW 9 | N 9 | N 12 | NNE 11 | NNE 10 | SSW 17 | SSW 16 | SSE 10 | N 10 | NW 16 | — | NNW 13 | WSW 11 | E 14 | NW 9 | NW 9 | E 14 | SSW 14 | SSW 13 |
| kJ | 66 | 64 | 3 | 1 | 3 | 12 | 20 | 30 | 48 | 19 | 8 | 10 | — | 18 | 23 | 153 | 81 | 84 | 184 | 36 | 34 |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 14 | ENE 7 | ENE 13 | ENE 13 | ENE 12 | ENE 12 | ENE 12 | E 7 | ESE 8 | S 11 | — | — | — | — | ENE 8 | ENE 7 |
| kJ | 440 | 456 | 392 | 392 | 394 | 2012 | 320 | 1679 | 1930 | 1703 | 1676 | 1676 | 856 | 1008 | 1168 | — | — | — | — | 196 | 193 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 55 | 117 | 50 | 55 | 117 | 44 | 44 | 116 | 17 | 44 | 48 | 52 | 118 | 113 | 142 | 5 | 0 | 0 | 16 | 44 | 44 |
Best forecast wave conditions in Oahu | |||||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||||
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Information about the Waimanalo Surf forecast
The above surf forecast table for Waimanalo provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Waimanalo can be found by selecting the local surf guide option on the grey menu. Our Waimanalo 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 (Waimanalo) 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 Waimanalo 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.
Waimanalo is 7 km (4 miles) from Kailua. If you plan a vacation in Oahu, look for hotels and other accommodation in Kailua. Kailua has rooms for a wide range of budgets as well as car hire and transport links.
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