Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 7 am 12 Sep 2026 (local time)

Forecast update in  hr  min

Today's Ammonias sea temperature is
26.9°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 12 Sep 2026:

  • Most powerful swell: Friday 18 Sep, 2AM (local time) - 7ft (2.2m), 9s period, ENE swell with 809 kJ wave energy.

Best Forecast Surf Conditions for Ammonias this week:

The most powerful waves expected at Ammonias in the next 16 days are 2.2m 9s and forecast to arrive on Friday (Sep 18) at 2AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.2m 9s period and expected on Sunday (Sep 13) at 8PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 2AM (Fri 18th Sep)7ft (2.2m) 9s

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


The Lowdown

G’day, Rusty here.

Look, I’m not gonna sugarcoat it – this 16-day run for Ammonias is a real tough one. We’re starting on Saturday the 12th of September and, honestly, there’s just nothing to get excited about for a long, long stretch. The entire first week is a write-off. We’re looking at weak, short-period slop with a persistent cross-onshore wind that’s got the surface all chopped up. The water’s sitting at 80°, which is pretty much bang on average for this time of year, so no surprises there.

The first few days, Saturday the 12th through Tuesday the 15th, are all “poor surf conditions.” Swell heights barely tickle 3 ft, and the combined energy is weak to moderate, like 255 to 528. It’s just a messy, cross-onshore breeze making a mess of things. You’d be wasting your time.

We finally see a bit of a bump on Wednesday the 16th, with the swell sneaking up to 3 ft and a period of 18 seconds. The combined energy jumps up to 739, which is in the moderate range. But the wind is still cross-shore and a bit breezy at 25 km/h, so it’s only called “marginal.” It’s a tease, not a thrill.

Thursday the 17th gets a bit bigger, with swell pushing 6 ft, but the period drops to a pitiful 7-8 seconds. That’s just short-period, wind-affected junk, and the cross-shore wind is still 25 km/h. The energy hits 957, but with that windy, short-period mess, it’s not surfable. Definitely not for beginners at that size, but the quality is so poor that even experts would be frustrated. The setup looks more interesting for kite surfing than paddle surfing.

The pattern just repeats. Friday the 18th sees 3 ft swell with a decent 16-17 second period, and combined energy over 1000 – strong to very strong. But the wind is still cross-shore and moderate, keeping it marginal at best. There’s a bit of a window that afternoon where it’s truly cross-shore, but it’s still messy.

From Saturday the 19th right through to the end on Sunday the 27th, it’s a blur of “poor” and “marginal” calls. The swell direction swings around, mostly from the SSW or ENE, and the wind never cleans up. The wave energy bounces between 500 and 900, but the conditions just don't come together. The swell starts to push over 5 ft again from the 21st to the 23rd, but it’s short-period stuff again, with a 7-10 second range, and the wind is always cross-onshore or cross.

There isn’t a single standout session in this entire forecast. The only day that even hinted at being okay was Wednesday the 16th afternoon, but even that was barely surfable. For Ammonias, this is a long, dry, frustrating stretch. Sometimes it’s just like this – the conditions don’t line up, and you’ve got to sit it out.

Later, Rusty.

Short Range Forecast

Mostly dry. Warm (max 26°C on Sat morning, min 24°C on Sat morning). Wind will be generally light.

Days 4-6 Weather Summary

Light rain (total 6mm), mostly falling on Wed night. Warm (max 27°C on Wed morning, min 25°C on Tue morning). Wind will be generally light.

Saturday
12
Sunday
13
Monday
14
Tuesday
15
Wednesday
16
Thursday
17
Friday
18
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
1
0
0
0
1
0
1
2
1
1
3
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.9
ENE
10
0.8
ENE
10
0.5
SSW
13
0.5
SW
15
0.4
SSW
15
0.5
SW
14
0.4
SW
14
0.5
SW
22
0.5
SW
21
0.7
SW
20
0.7
SW
19
0.7
SW
19
0.8
SSW
18
0.9
SSW
18
0.8
SSW
17
1.7
ENE
7
2
ENE
8
2.2
ENE
9
1.9
ENE
9
1.8
ENE
9
1
SSW
16
Wave Graph
Metric surfscale
Energy kJ
173
128
98
104
84
99
49
227
224
392
384
372
395
541
360
301
474
809
608
566
532
Wind (km/h)
15
E
15
ENE
10
ENE
15
E
15
ENE
15
ENE
15
ENE
20
ENE
15
ENE
20
ENE
20
ENE
15
ENE
20
ENE
25
NE
25
NE
25
NE
25
NE
20
NE
20
ENE
20
ENE
10
E
Wind State
cross-on
cross-on
cross-on
cross-on
cross-on
cross
cross-on
cross-on
cross
cross-on
cross
cross
cross
cross
cross
cross
cross
cross
cross-on
cross-on
cross-on
High Tide
4:16PM0.48m
5:11AM0.54m
4:38PM0.41m
5:56AM0.55m
4:55PM0.35m
6:45AM0.55m
4:58PM0.30m
7:44AM0.54m
9:00AM0.53m
10:23AM0.54m
9:42PM0.19m
Low Tide
10:19AM0.13m
10:28PM0.04m
11:10AM0.18m
10:50PM0.04m
12:08PM0.22m
11:14PM0.05m
1:23PM0.26m
11:40PM0.08m
00:11AM0.10m
00:58AM0.13m
9:18PM0.19m
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
clear
clear
clear
clear
clear
rain showers
thunderstorm
clear
thunderstorm
thunderstorm
thunderstorm
thunderstorm
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:22
6:22
6:22
6:24
6:24
6:24
6:24
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:43
6:42
6:40
6:39
6:38
6:37
6:37
 mm
3
2
1
6
4
4
Temp °C
26
26
25
26
25
25
25
26
25
26
26
25
27
27
26
26
27
25
27
27
26
Feels °C
27
27
26
28
26
26
26
26
25
27
27
27
28
27
27
26
27
25
28
28
27
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  • 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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