Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 1 pm 11 Sep 2026 (local time)

Forecast update in  hr  min

Today's Ammonias sea temperature is
26.6°C
0.4° 

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: Thursday 17 Sep, 11PM (local time) - 3.5ft (1.0m), 18s period, SSW swell with 659 kJ wave energy.

Best Forecast Surf Conditions for Ammonias this week:

The most powerful waves expected at Ammonias in the next 16 days are 1.0m 18s and forecast to arrive on Thursday (Sep 17) at 11PM. 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 8s period and expected on Tuesday (Sep 15) at 5PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful11PM (Thu 17th Sep)3.5ft (1.0m) 18s

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


The Lowdown

Alright, Rusty here, let’s chew the fat on what’s coming up for Ammonias over the next couple of weeks.

Honestly, it’s a pretty tough outlook for this reef setup. There’s a long, frustrating gap at the start. We’re talking about a stretch of six days, from Friday the 11th right through to Wednesday the 16th, where conditions are just not good – mostly poor surf and choppy, cross-onshore winds. There’s a bit of energy from a long-period groundswell on the 15th, around 2ft from the SW, but the wind messes it up. You’d be wasting your time.

Things start to look a little more interesting around Wednesday afternoon the 16th, with a bit more energy in the water (combined energy of 810), but it’s still a marginal call with a moderate cross-shore chop. The best bet in this whole window looks to be Thursday the 17th. You’ve got a bump in swell from the ENE, pushing 7ft in the morning and holding at 6ft in the afternoon. The period is short though, only 8 seconds, so it’ll be a bit soft and lumpy. The wind is cross-shore from the NE at 12 mph, so it’s not ideal, but it’s the most size you’ll see. The combined energy is strong at 933 in the morning and 1011 in the afternoon, but this is really only for experienced surfers; 7ft with that short period can be a handful and is too big for beginners.

After that, Friday the 18th has an interesting spike in energy (1210) from a SSW groundswell, but the swell drops to 3ft, so it’s all just power with less height. The wind is still cross-shore, keeping things average. Crowds at Ammonias are often an issue, so with the lack of quality, it might be a quiet one.

Looking further out, into the last week of September, the pattern doesn’t improve much. There’s a flash on Wednesday the 24th with 5ft from the E and a moderate cross-shore wind, but the energy is a bit messy. Friday the 25th afternoon shows an offshore wind from the SSE at just 3 mph, which is a big positive, and the swell is 5ft from the E. That could clean up nicely if it connects, but the period is short at 8 seconds and the overall energy is moderate (531). It’s a potential standout for the second week, but it’s a long ways out and less certain.

Water temperature is 80°F, pretty much average for this time of year, so no wetsuit needed.

So, to sum it up for you: Thursday the 17th is your best shot for size, and keep an eye on Friday the 25th afternoon for a possible clean but small window. Otherwise, it’s a long wait.

Rusty.

Short Range Forecast

Mostly dry. Warm (max 26°C on Fri afternoon, min 23°C on Sun night). Wind will be generally light.

Days 5-7 Weather Summary

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

Fri
11
Saturday
12
Sunday
13
Monday
14
Tuesday
15
Wednesday
16
Thursday
17
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
1
2
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
2
2
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.4
ENE
8
1.3
ENE
11
0.9
ENE
10
0.9
ENE
10
0.5
SSW
13
0.7
ENE
9
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
0.8
SSW
19
0.9
SW
18
0.9
SSW
18
0.8
SSW
17
2
ENE
8
1.9
ENE
8
1
SSW
18
Wave Graph
Metric surfscale
Energy kJ
229
379
163
160
98
84
84
99
49
227
224
392
384
465
449
541
360
449
395
651
Wind (km/h)
15
ENE
15
ENE
15
E
15
ENE
10
ENE
15
ENE
15
ENE
15
ENE
15
ENE
20
ENE
15
ENE
15
ENE
20
ENE
20
ENE
25
ENE
25
NE
25
NE
20
NE
20
NE
15
NE
Wind State
cross
cross
cross-on
cross-on
cross-on
cross-on
cross-on
cross
cross-on
cross
cross
cross-on
cross
cross
cross
cross
cross
cross
cross
cross
High Tide
3:51PM0.55m
4:29AM0.51m
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
Low Tide
10:06PM0.05m
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
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
clear
clear
rain showers
clear
clear
clear
clear
part cloud
clear
<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
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:44
6:43
6:42
6:40
6:39
6:38
6:37
 mm
2
Temp °C
26
25
26
25
25
26
25
25
26
26
25
26
27
25
27
27
26
27
27
26
Feels °C
26
26
27
25
26
27
26
26
26
26
25
27
28
26
28
27
27
28
27
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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