Ammonias Surf Break

Lat Long: 21.95° N 159.35° W

Ammonias Surf Forecast and Surf Report

Issued: 1 pm 09 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 10 Sep 2026:

  • Best quality surf: Thursday 10 Sep, 2AM (local time) - 2.5ft (0.7m), 13s period, SSW swell with cross-offshore winds.
  • Most powerful swell: Wednesday 16 Sep, 2PM (local time) - 3ft (0.9m), 18s period, SSW swell with 541 kJ wave energy.
  • Next surfable swell (1★+): Thursday 10 Sep, 2AM (local time) - 2.5ft (0.7m), 13s period with SSW swell.

Best Forecast Surf Conditions for Ammonias this week:

The surf forecast for Ammonias over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Sep 10) at 2AM. The primary swell is predicted to be 0.7m and 13s period with a secondary swell of 0.9m and 8s. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Ammonias in the next 16 days are 0.9m 18s and forecast to arrive on Wednesday (Sep 16) at 2PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 8s period and expected on Monday (Sep 14) at 5PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+) 2AM (Thu 10th Sep)2.5ft (0.7m) 13s
Best Surf 2AM (Thu 10th Sep)2.5ft (0.7m) 13s
Most Powerful 2PM (Wed 16th Sep)3ft (0.9m) 18s

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


The Lowdown

Alright, Rusty here with the lowdown. We've got a sixteen-day forecast for Ammonias, and it's a mixed bag with one golden window.

Water temp is holding around 80°, right where it should be.

Clear standout is Wednesday, September 9th. We’ve got a small 3ft swell from the SSW, but the wind is dead glass. That’s the ticket for clean, smooth waves. The energy is solid (418), and it’s the only day that looks really good.

Then comes the bad news. From Thursday the 10th right up to Tuesday the 22nd, it's a long stretch of poor surf. The wind is blowing cross-on or cross-shore from the east and northeast, turning everything into a choppy mess. Swell sizes fluctuate, but the quality is shot. Some of that swell is long-period (15-22 seconds), which would be epic, but without clean wind, it doesn’t matter. You'll see moderate to strong energy readings (like 658, 667, 776, 934), but those numbers just tell you the ocean is powerful and messy—more of a kite-surfing scene than a clean wave.

There’s a tiny window late on Wednesday the 23rd. The wind goes glassy again, but the swell is only 2ft from the SSW. It’s rideable on a longboard, but nothing to get too excited about.

So, mark your calendar for the 9th. It’s your only real shot at something clean. The rest is a write-off.

Rusty.

Short Range Forecast

Light rain (total 5mm), mostly falling on Thu night. Warm (max 27°C on Wed afternoon, min 24°C on Thu night). Wind will be generally light.

Days 5-7 Weather Summary

Some drizzle, heaviest during Sat night. Warm (max 26°C on Mon afternoon, min 24°C on Sat night). Wind will be generally light.

Wed
9
Thursday
10
Friday
11
Saturday
12
Sunday
13
Monday
14
Tuesday
15
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
2
2
0
0
1
0
1
0
0
0
1
0
0
0
0
1
1
0
0
1
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
SSW
13
0.7
SSW
13
1.3
ENE
8
1.5
ENE
7
1.5
ENE
7
0.6
SW
16
1.4
ENE
8
1.3
ENE
11
0.9
ENE
10
0.9
ENE
10
0.8
ENE
9
0.5
SW
15
0.5
E
9
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
Wave Graph
Metric surfscale
Energy kJ
253
178
191
237
218
198
229
379
173
169
115
104
40
97
49
227
224
392
384
465
Wind (km/h)
5
SE
10
NE
15
E
20
ENE
20
ENE
20
ENE
15
ENE
15
ENE
15
E
15
ENE
10
ENE
15
ENE
15
ENE
20
ENE
15
ENE
15
NE
10
NE
15
ENE
10
ENE
15
ENE
Wind State
glassy
cross-off
cross-on
cross-on
cross
cross-on
cross
cross-on
cross-on
cross-on
cross
cross-on
cross
cross-on
cross
cross
cross
cross-on
cross-on
cross
High Tide
2:54PM0.66m
3:04AM0.41m
3:24PM0.61m
3:47AM0.47m
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
Low Tide
9:25PM0.09m
8:43AM0.05m
9:45PM0.07m
9:31AM0.09m
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
clear
clear
clear
thunderstorm
rain showers
part cloud
clear
clear
clear
clear
rain showers
clear
clear
clear
clear
clear
clear
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:22
6:22
6:22
6:22
6:22
6:24
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:45
6:45
6:44
6:43
6:42
6:40
6:39
 mm
2
3
1
Temp °C
27
26
27
26
25
25
25
24
25
25
25
25
25
25
25
26
25
26
27
26
Feels °C
30
30
29
27
26
25
25
24
26
26
26
25
26
26
25
26
26
28
30
29
  • Map Icons:
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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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