Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 1 am 24 Aug 2026 (local time)

Forecast update in  hr  min

Today's Ammonias sea temperature is
27.0°C
0.1° 

Ammonias surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


Ammonias surf forecast from 24 Aug 2026:

  • Most powerful swell: Thursday 27 Aug, 2PM (local time) - 3.5ft (1.1m), 17s period, S swell with 702 kJ wave energy.

Best Forecast Surf Conditions for Ammonias this week:

The most powerful waves expected at Ammonias in the next 16 days are 1.1m 17s and forecast to arrive on Thursday (Aug 27) at 2PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 7s period and expected on Monday (Aug 31) at 8AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 2PM (Thu 27th Aug)3.5ft (1.1m) 17s

Table - best surf conditions forecast for Ammonias over the next 16 days.


The Lowdown

Alright folks, Rusty here, ready to look at what’s cooking for Ammonias over the next couple of weeks.

Right off the bat, I gotta be straight with you – this forecast is a bit of a grind. We’re looking at a patchy run with a lot of middling conditions and consistent cross-shore wind from the ENE that’ll keep things a little scrappy. The water temp is sitting around 81°, which is bang on average for this time of year, so no surprises in the warmth.

Let’s kick it off from Monday, the 24th of August. We’ve got some swell in the water, about 6 ft from the ENE with a short, punchy 7-second period. The combined energy is moderate (604). But that ENE wind is blowing at 16 mph from the same direction, making it a lumpy cross-shore mess. It’s marginal at best, really just blown out and messy. This sets the tone for most of the first week – the swell sticks around from the east, with heights between 5 ft and 6 ft, but that constant 16 mph ENE wind just won’t let up. The cross-chop will have you battling for any clean face. Wednesday the 26th afternoon sees a brief switch to a 3 ft S swell with a long 18-second period (energy still moderate at 757), but the wind stays cross, so don’t get your hopes up.

The real glimmer in this forecast is down the track, and I mean *way* down the track. We’re talking Monday, the 1st of September. That morning, we see a jump to a solid 7 ft from the ENE, with a slightly longer 9-second period, and the combined energy kicks up into strong territory (1163). The wind is still cross at 16 mph, so it won't be perfectly glassy, but that's a heap more energy to work with. This is the standout push of the whole outlook if you want some size and power.

Then, hold onto your board shorts for Saturday, the 5th of September. The afternoon session shows a 6 ft easterly swell with a nice 13-second period, and the energy tracker blows up to a very strong 1371. This is the best looking wave window. The wind is still cross from the NE at 16 mph, which isn't ideal, but that groundswell energy is serious. It'll want to break a bit straight at a beach break, but for a reef like Ammonias, the long-period swell should wrap in nicely and offer some proper shape. If you can only pick one window in this whole 16-day run, that Saturday afternoon is where the magic might just happen.

Before that, there’s a run from Tuesday, the 2nd, through Friday, the 5th, where we bounce between fairly average 3-5 ft stuff. Nothing really clean.

Heading into the second week, things cool off energy-wise, with lots of smaller, longer-period S swells and light winds, but that usually means the surf is inconsistent and hard to catch. The 8th of September morning shows another pulse of 6 ft from the ENE (8 seconds) with offshore SE wind at 6 mph – that’s a rare window with clean conditions and decent size for those who like it a bit more manageable.

So yeah, the short-term is a write-off with that wind. The best bets are the 1st of September for strong, powerful, but messy waves, and the 5th of September afternoon for the real quality groundswell. Don't sleep on that. It's a waiting game, but there's light at the end of the tunnel.

Rusty.

Short Range Forecast

Light rain (total 2mm), mostly falling on Mon morning. Warm (max 27°C on Mon morning, min 24°C on Wed night). Wind will be generally light.

Days 4-6 Weather Summary

Light rain (total 6mm), mostly falling on Thu night. Warm (max 26°C on Thu morning, min 24°C on Thu night). Wind will be generally light.

Monday
24
Tuesday
25
Wednesday
26
Thursday
27
Friday
28
Saturday
29
Sunday
30
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
1
1
0
0
1
1
0
1
1
1
1
1
1
0
1
0
0
1
1
1
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.9
ENE
7
1.7
ENE
7
1.5
E
7
1.8
ENE
7
1.9
E
7
1.6
E
7
1.8
E
7
0.8
S
18
0.9
S
19
1.1
S
17
1
S
17
1.1
S
15
0.9
S
14
1
S
14
0.9
S
14
1.6
ENE
7
1.7
ENE
7
1.9
ENE
7
1.6
ENE
7
1.5
ENE
7
0.7
SSW
15
Wave Graph
Metric surfscale
Energy kJ
307
268
206
290
348
233
278
395
573
691
553
567
334
394
294
247
262
316
251
224
196
Wind (km/h)
25
ENE
25
ENE
20
ENE
25
ENE
25
ENE
20
ENE
25
ENE
25
NE
20
NE
25
ENE
20
NE
20
NE
20
ENE
25
ENE
20
ENE
25
ENE
25
ENE
25
ENE
25
NE
25
ENE
20
NE
Wind State
cross
cross
cross-on
cross-on
cross
cross
cross-on
cross
cross
cross
cross
cross
cross
cross
cross
cross-on
cross
cross
cross
cross
cross
High Tide
2:19PM0.63m
1:51AM0.28m
2:48PM0.64m
2:25AM0.31m
3:14PM0.64m
3:02AM0.35m
3:38PM0.62m
3:40AM0.38m
4:02PM0.59m
4:22AM0.42m
4:25PM0.55m
5:07AM0.46m
4:47PM0.49m
Low Tide
9:23PM0.17m
7:21AM0.04m
9:34PM0.16m
8:01AM0.03m
9:50PM0.13m
8:40AM0.04m
10:08PM0.11m
9:19AM0.06m
10:29PM0.08m
10:02AM0.10m
10:52PM0.06m
10:51AM0.15m
11:17PM0.04m
thunderstorm
clear
clear
part cloud
clear
part cloud
clear
clear
part cloud
part cloud
clear
rain showers
clear
clear
rain showers
clear
rain showers
part cloud
rain showers
clear
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:16
6:18
6:18
6:18
6:18
6:18
6:18
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:00
7:00
6:59
6:58
6:57
6:55
6:54
 mm
2
1
3
2
1
2
Temp °C
27
27
26
26
27
25
26
26
25
26
26
25
26
26
25
26
26
25
26
26
25
Feels °C
28
28
27
25
27
25
25
25
24
25
25
25
26
25
24
25
25
24
25
25
25
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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Information about the Ammonias Surf forecast

The above surf forecast table for Ammonias provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Ammonias can be found by selecting the local surf guide option on the grey menu. Our Ammonias 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 (Ammonias) 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 Ammonias 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 Kaua'i? If you are looking for accommodation near Ammonias, camping, hotels and condos and appartments in Kaua'i, consider staying in Nawiliwili which is 2 km (1 miles) away. Alternatively, find information about places to stay and car hire in Lihue - Kauai which is 3 km (2 miles) away

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